<SEC-DOCUMENT>0000067716-16-000167.txt : 20160722
<SEC-HEADER>0000067716-16-000167.hdr.sgml : 20160722
<ACCEPTANCE-DATETIME>20160722125602
ACCESSION NUMBER:		0000067716-16-000167
CONFORMED SUBMISSION TYPE:	S-8
PUBLIC DOCUMENT COUNT:		6
FILED AS OF DATE:		20160722
DATE AS OF CHANGE:		20160722
EFFECTIVENESS DATE:		20160722

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MDU RESOURCES GROUP INC
		CENTRAL INDEX KEY:			0000067716
		STANDARD INDUSTRIAL CLASSIFICATION:	MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
		IRS NUMBER:				410423660
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-8
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-212635
		FILM NUMBER:		161779232

	BUSINESS ADDRESS:	
		STREET 1:		1200 WEST CENTURY AVENUE
		CITY:			BISMARCK
		STATE:			ND
		ZIP:			58503
		BUSINESS PHONE:		701-530-1059

	MAIL ADDRESS:	
		STREET 1:		1200 WEST CENTURY AVENUE
		CITY:			BISMARCK
		STATE:			ND
		ZIP:			58503

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MONTANA DAKOTA UTILITIES CO
		DATE OF NAME CHANGE:	19850429
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-8
<SEQUENCE>1
<FILENAME>a2016-sx8registrationstate.htm
<DESCRIPTION>S-8
<TEXT>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<!-- Document created using Wdesk 1 -->
		<!-- Copyright 2016 Workiva -->
		<title>Wdesk | Document</title>
	</head>
	<body style="font-family:Times New Roman;font-size:10pt;">
<div><a name="s8F3CCC41DA72A0DBFBC59BE6745224A5"></a></div><div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:99.81481481481481%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:86%;"></td><td style="width:14%;"></td></tr><tr><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">&#160;&#160;As filed with the Securities and Exchange Commission on  July 22, 2016</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Registration No. 333&#8209;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;padding-top:8px;text-align:center;font-size:16pt;"><font style="font-family:inherit;font-size:16pt;font-weight:bold;">UNITED STATES</font></div><div style="line-height:120%;text-align:center;font-size:16pt;"><font style="font-family:inherit;font-size:16pt;font-weight:bold;">SECURITIES AND EXCHANGE COMMISSION</font></div><div style="line-height:120%;text-align:center;font-size:16pt;"><font style="font-family:inherit;font-size:16pt;font-weight:bold;">WASHINGTON, D.C. 20549</font></div><div style="line-height:120%;text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">__________________</font></div><div style="line-height:120%;padding-top:8px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">FORM S-8</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">REGISTRATION STATEMENT</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">UNDER</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">THE SECURITIES ACT OF 1933</font></div><div style="line-height:120%;text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">__________________</font></div><div style="line-height:120%;padding-top:8px;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">MDU RESOURCES GROUP, INC.</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(Exact name of registrant as specified in its charter)</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:72.4074074074074%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:36%;"></td><td style="width:32%;"></td><td style="width:32%;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:4px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Delaware</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(</font><font style="font-family:inherit;font-size:9pt;">State or other jurisdiction of</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">incorporation or organization)</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:2px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">No. 41-0423660</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(I.R.S. Employer</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Identification Number)</font></div></td></tr></table></div></div><div style="line-height:120%;padding-top:8px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">1200 West Century Avenue</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">P.O. Box 5650</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Bismarck, North Dakota 58506-5650</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(Address of principal executive offices, including zip code)</font></div><div style="line-height:120%;text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">__________________</font></div><div style="line-height:120%;padding-top:4px;text-align:center;font-size:16pt;"><font style="font-family:inherit;font-size:16pt;font-weight:bold;">MDU RESOURCES GROUP, INC.</font></div><div style="line-height:120%;text-align:center;font-size:16pt;"><font style="font-family:inherit;font-size:16pt;font-weight:bold;">401(k) RETIREMENT PLAN</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(Full title of the plan)</font></div><div style="line-height:120%;text-align:center;font-size:6pt;"><font style="font-family:inherit;font-size:6pt;font-weight:bold;">________________________</font></div><div style="line-height:120%;text-align:center;font-size:9pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:679px;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:216px;"></td><td style="width:232px;"></td><td style="width:230px;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">David L. Goodin</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">President</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">and Chief Executive Officer </font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">MDU Resources Group, Inc.</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">1200 West Century Avenue</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Bismarck, North Dakota 58506-5650</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(701) 530-1000</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">Doran N. Schwartz</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Vice President and</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Chief Financial Officer</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">MDU Resources Group, Inc.</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">1200 West Century Avenue</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Bismarck, North Dakota 58506-5650</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(701) 530-1000</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;"><br></font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">Elizabeth W. Powers</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Duane Morris LLP</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">1540 Broadway</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">New York, New York 10036</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(212) 692-1000</font></div><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;"><br></font></div></td></tr></table></div></div><div style="line-height:120%;text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(Name, address and telephone number, including area code, of agents for service)</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">_____________</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:99.81481481481481%;border-collapse:collapse;text-align:left;"><tr><td colspan="7"></td></tr><tr><td style="width:24%;"></td><td style="width:17%;"></td><td style="width:3%;"></td><td style="width:9%;"></td><td style="width:21%;"></td><td style="width:3%;"></td><td style="width:23%;"></td></tr><tr><td colspan="7" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of &#8220;large accelerated filer,&#8221; &#8220;accelerated filer&#8221; and &#8220;smaller reporting company&#8221; in Rule 12b-2 of the Exchange Act.  (Check one):</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="font-size:9pt;"><font style="font-family:inherit;font-size:9pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Large accelerated filer</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:Wingdings;font-size:9pt;">x</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Accelerated filer</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:Wingdings;font-size:9pt;">&#168;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Non-accelerated filer</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:Wingdings;font-size:9pt;">&#168;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Smaller reporting company</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:Wingdings;font-size:9pt;">&#168;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;padding-top:12px;text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;font-weight:bold;">CALCULATION OF REGISTRATION FEE</font></div><div style="line-height:120%;padding-left:8px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:98.88888888888889%;border-collapse:collapse;text-align:left;"><tr><td colspan="5"></td></tr><tr><td style="width:20%;"></td><td style="width:20%;"></td><td style="width:20%;"></td><td style="width:20%;"></td><td style="width:20%;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Title of securities<br>to be registered(1)</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Amount to be<br>registered(2)</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Proposed maximum<br>offering price<br>per share(3)</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Proposed maximum<br>aggregate offering<br>price(3)</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Amount of<br>registration fee</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Common Stock,<br>$1.00 par value</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">4,500,000 shares</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$24.23</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$109,035,000</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$10,979.83</font></div></td></tr><tr><td colspan="5" style="vertical-align:top;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(1) In addition, pursuant to Rule 416(c) under the Securities Act of 1933, this registration statement also covers an indeterminate amount of interests to be offered or sold pursuant to the employee benefit plan described herein.<br>(2) Pursuant to Rule 416(a) under the Securities Act of 1933, this registration statement also covers any additional securities to be offered or issued in connection with a stock split, stock dividend or similar transaction.<br>(3) Determined on the basis of the average of the high and low sale price of the common stock as reported in the consolidated reporting system on July 18, 2016, solely for the purpose of calculating the registration fee pursuant to Rule 457(h) under the Securities Act of 1933.<br></font></div></td></tr></table></div></div><div><br></div><div></div><hr style="page-break-after:always"><div><a name="sF322A4DD29B6C32B655F9BE6738AB53A"></a></div><div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Part II</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Item 3.  Incorporation of Documents by Reference.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">We incorporate by reference in this registration statement the following documents we or the MDU Resources Group, Inc. 401(k) Retirement Plan have filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934:</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">1.  Annual Report on Form 10-K for the year ended December 31, 2015, filed on February&#160;19, 2016 (SEC File No. 1-3480);</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">2.  Quarterly Report on Form 10-Q for the quarter ended March 31, 2016, filed on May&#160;6, 2016 (SEC File No. 1-3480);</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">3. The MDU Resources Group, Inc. 401(k) Retirement Plan&#8217;s Annual Report on Form 11&#8209;K for the year ended December 31, 2015, filed on June 17, 2016 (SEC File No. 1-3480);</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">4.  Current Reports on Form 8-K dated February 10, 2016 and filed on February 18, 2016, as amended by Amendment No. 1 thereto filed on April 29, 2016; dated March 2, 2016 and filed on March 8, 2016; dated April 4, 2016 and filed on April 5, 2016; dated April 26, 2016 and filed on April 27, 2016, as amended by  Amendment No. 1 thereto filed on April 29, 2016; and dated June 24, 2016 and filed on June 28, 2016, as amended by Amendment No. 1 thereto filed on July 21, 2016 (SEC File No. 1-3480); and</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">5.  Description of the common stock contained in the Registration Statement on Form 8&#8209;A, filed on September 21, 1994 as amended by Amendment No. 1 thereto, filed on March 23, 2000, Amendment No. 2 thereto, filed on March 10, 2003, Amendment No. 3 thereto, filed on January 21, 2004, Amendment No. 4 thereto, filed on June 27, 2007, Amendment No. 5 thereto, filed on November 19, 2008, Amendment No. 6 thereto, filed on January 5, 2009, Amendment No. 7 thereto, filed on April 30, 2010, Amendment No. 8 thereto, filed on August 19, 2014, Amendment No. 9 thereto, filed on May 8, 2015, and any further amendment or report filed for the purpose of updating such description (SEC File No. 1&#8209;3480).</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">In April 2015, the FASB issued guidance on simplifying the presentation of debt issuance costs in the financial statements. This guidance requires entities to present debt issuance costs as a direct deduction to the related debt liability. The amortization of these costs will be reported as interest expense.  The guidance was effective for MDU Resources Group, Inc. on January&#160;1, 2016, and is to be applied retrospectively. The guidance required a reclassification of the debt issuance costs on the Consolidated Balance Sheets, but did not impact the Company's results of operations or cash flows. As a result of the retrospective application of this change in accounting principle, the Company reclassified debt issuance costs of $100,000, $100,000 and $100,000 from prepayments and other current assets and $5.5&#160;million, $6.0&#160;million and $5.5&#160;million from other deferred charges and other assets to long-term debt on its Consolidated Balance Sheets at March&#160;31, 2015, and December&#160;31, 2015 and 2014, respectively.</font></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">&#160;</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;</font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-1</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">All documents that we or the MDU Resources Group, Inc. 401(k) Retirement Plan subsequently file pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934 other than any information we furnish, rather than file, with the Securities and Exchange Commission pursuant to certain items of Form 8-K, prior to the filing of a post-effective amendment which indicates that all securities offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference in the registration statement and to be part hereof from the date of filing of such documents. Any statement contained herein shall be deemed to be modified or superseded for purposes of this registration statement to the extent that a statement contained in any subsequently filed document which is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this registration statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this registration statement.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Item 5. Interests of Named Experts and Counsel.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">The consolidated financial statements and the related financial statement schedules, incorporated in the registration statement by reference from our Annual Report on Form 10-K for the year ended December 31, 2015, and the effectiveness of our internal control over financial reporting, have been audited by Deloitte &amp; Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated herein by reference. Such consolidated financial statements and financial statement schedules have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:115%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">The statements of net assets available for benefits of the MDU Resources Group, Inc.  401(k) Retirement Plan as of December 31, 2015 and 2014, and the related statement of changes in net assets available for benefits for the year ended December 31, 2015, incorporated in the registration statement by reference from the plan&#8217;s Annual Report on Form 11-K for the year ended December 31, 2015, have been audited by Baker Tilly Virchow Krause, LLP, an independent registered public accounting firm, as stated in their report, which is incorporated herein by reference (which report expresses an unqualified opinion on the statements of net assets available for benefits of the plan as of December 31, 2015 and 2014 and the related statement of changes in net assets available for benefits for the year ended December 31, 2015). Such statements of net assets available for benefits of the plan and statement of changes in net assets available for benefits have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">The validity of the common stock has been passed upon for us by Daniel S. Kuntz, Esq., our General Counsel, and by Duane Morris LLP, New York, New York.  As of July 15, 2016, Mr.&#160;Kuntz owned approximately 20,057.375 shares of our common stock.</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-2</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Item 6. Indemnification of Directors and Officers.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Our bylaws include the following provision:</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">7.07  </font><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Indemnification of Officers, Directors, Employees and Agents.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:115%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font><font style="font-family:inherit;font-size:12pt;">&#160;(a)&#160;&#160;</font><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Indemnification Granted.</font><font style="font-family:inherit;font-size:12pt;">&#32;&#32;The Corporation shall indemnify and hold harmless, to the fullest extent permitted by applicable law as it presently exists&#160;or may hereafter be amended, any director or former director or officer or&#160;former officer of the Corporation (a &#8220;Director or Officer&#8221;) who was or is made or is threatened to be made a party or is otherwise involved in any action, suit or&#160;proceeding, whether civil, criminal, administrative or investigative (a&#160;&#8220;Proceeding&#8221;) by reason of the fact that he or she is or was a director or officer of the Corporation or is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation or of a partnership, limited liability company, joint venture, trust, non-profit entity or other enterprise, including service with respect to employee benefit plans, against&#160;expenses (including attorneys&#8217; fees), judgments, fines, penalties, excise&#160;taxes&#160;and penalties assessed with respect to employee benefit plans, and&#160;amounts paid in settlement actually and reasonably incurred by such Director or Officer. The Corporation shall be required to indemnify a Director or Officer in connection with a Proceeding (or part thereof) initiated by such Director or Officer only if the Proceeding (or part thereof) was authorized by the Board of Directors.</font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-24px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(b)&#160;&#160;</font><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Consent to Settlement or Nonadjudicated Disposition.</font><font style="font-family:inherit;font-size:12pt;">&#32;&#32;No indemnification pursuant to this Section 7.07 shall be required with respect to any settlement or other nonadjudicated disposition of any threatened or pending Proceeding unless the Corporation has given its prior consent to such settlement or disposition.</font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(c)&#160;&#160;</font><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Advancement of Expenses.</font><font style="font-family:inherit;font-size:12pt;">&#32;&#32;The Corporation shall pay the expenses incurred by a Director or Officer in defending any Proceeding in advance of its final disposition, provided, however, that the payment of such expenses shall be made only upon receipt of an undertaking by the Director or Officer to repay all amounts advanced if it shall ultimately be determined that the Director or Officer is not entitled to be indemnified.</font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(d)&#160;&#160;</font><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Claims.</font><font style="font-family:inherit;font-size:12pt;">&#32;&#32;If a claim for indemnification (following a final full or partial disposition of a Proceeding with respect to which indemnification is sought) or advancement of expenses (including attorneys&#8217; fees) under this Section 7.07 is not paid in full within sixty (60) days after a written claim therefor has been received by the Corporation, the Director or Officer may file suit to recover the unpaid amount of such claim and, if successful in whole or in part, shall be entitled to be paid the expense of prosecuting such claim, to the fullest extent permitted by applicable law. In any such action, the Corporation shall have the burden of proving that the Director or Officer was not entitled to the requested indemnification or advancement of expenses under this Section 7.07 or applicable law.</font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-3</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(e)&#160;&#160;</font><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Other Indemnification and Advancement of Expenses.</font><font style="font-family:inherit;font-size:12pt;">&#32;&#32;The Corporation may provide indemnification and advancement of expenses (including attorneys&#8217; fees) to employees and agents to the extent permitted by applicable law.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(f)&#160;&#160;&#160;</font><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Non-exclusivity of Rights.</font><font style="font-family:inherit;font-size:12pt;">&#32;&#32;The rights conferred on any Director or Officer by this Section 7.07 shall not be exclusive of other rights to which such Director or Officer may have or hereafter acquire under any statute, provision of the Certificate of Incorporation, these Bylaws, agreement, vote of stockholders or disinterested directors or otherwise. Nothing in this Section 7.07 shall limit the power of the Corporation or the Board of Directors to grant indemnification and advancement of expenses, including attorneys&#8217; fees, to directors, officers, employees and agents otherwise than pursuant to this Section 7.07.</font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(g)&#160;&#160;</font><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Other Source Indemnification.</font><font style="font-family:inherit;font-size:12pt;">&#32;&#32;The Corporation&#8217;s obligation to indemnify any Director or Officer who was or is serving at its request as a director, officer, employee or agent of another corporation or of a partnership, limited liability company, joint venture, trust, non-profit entity or other enterprise shall be reduced by any amount such Director or Officer may collect as indemnification from such other corporation, partnership, limited liability company, joint venture, trust, non-profit entity or other enterprise.</font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(h)&#160;&#160;</font><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Repeal or Modification; Legal Representatives.</font><font style="font-family:inherit;font-size:12pt;">&#32;&#32;Any repeal or modification of the foregoing provisions of this Section 7.07 shall not adversely affect any right or protection hereunder of any Director or Officer in respect of any act or omission occurring prior to the time of such repeal or modification. The rights provided to any Director or Officer by this Section 7.07 shall inure to the benefit of such Director&#8217;s or Officer&#8217;s legal representative.</font></div><div style="line-height:120%;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Section 145 of the General Corporation Law of the State of Delaware provides for indemnification of our directors and officers in a variety of circumstances, which may include liabilities under the Securities Act of 1933. We maintain liability insurance protecting us, as well as our directors and certain officers, against liability by reason of their being or having been our directors or officers. In addition, we have entered into indemnification agreements with our directors and officers to provide for indemnification to the fullest extent permitted by applicable Delaware law and in excess of that expressly permitted by statute, but not to the extent prohibited by law.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Item 8.  Exhibits.</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:10%;"></td><td style="width:25%;"></td><td style="width:65%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.1</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Restated Certificate of Incorporation of MDU Resources Group, Inc., as amended, dated May 13, 2010, filed as Exhibit 3(a) to Form 10-Q for the quarter ended September 30, 2010, filed on November 3, 2010, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.2</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Bylaws of MDU Resources Group, Inc., as amended and restated on April 2, 2015, filed as Exhibit 3 to Form 10-Q for the quarter ended March 31, 2015, filed on May 8, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.3</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Indenture, dated as of December 15, 2003, between MDU Resources Group, Inc. and The Bank of New York, as trustee, filed as Exhibit 4(f) to Form S-8, on January 21, 2004, in Registration No. 333-112035.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr></table></div></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-4</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:10%;"></td><td style="width:25%;"></td><td style="width:65%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.4</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">First Supplemental Indenture, dated as of November 17, 2009, between MDU Resources Group, Inc. and The Bank of New York Mellon, as trustee, filed as Exhibit 4(c) to Form 10-K for the year ended December 31, 2009, filed on February 17, 2010, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.5</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU Resources Group, Inc. 401(k) Retirement Plan, as restated March 1, 2011, filed as Exhibit 10(a) to Form 10-Q for the quarter ended September 30, 2011, filed on November 4, 2011, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.6</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated March 29, 2011, filed as Exhibit 10(b) to Form 10-Q for the quarter ended March 31, 2011, filed on May 5, 2011, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.7</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated June 30, 2011, filed as Exhibit 10(d) to Form 10-Q for the quarter ended June 30, 2011, filed on August 5, 2011, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.8</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 9, 2011, filed as Exhibit 10(b) to Form 10-Q for the quarter ended September 30, 2011, filed on November 4, 2011, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.9</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 29, 2011, filed as Exhibit 10(ac) to Form 10-K for the year ended December 31, 2011, filed on February 24, 2012, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.10</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated May 24, 2012, filed as Exhibit 10(b) to Form 10-Q for the quarter ended June 30, 2012, filed on August 7, 2012, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.11</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated August 29, 2012, filed as Exhibit 10(a) to Form 10-Q for the quarter ended September 30, 2012, filed on November 7, 2012, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.12</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated August 29, 2012, filed as Exhibit 10(b) to Form 10-Q for the quarter ended September 30, 2012, filed on November 7, 2012, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.13</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 19, 2012, filed as Exhibit 10(z) to Form 10-K for the year ended December 31, 2012, filed on February 28, 2013, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.14</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 9, 2013, filed as Exhibit 10(b) to Form 10-Q for the quarter ended September 30, 2013, filed on November 7, 2013, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.15</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 9, 2013, filed as Exhibit 10(c) to Form 10-Q for the quarter ended September 30, 2013, filed on November 7, 2013, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.16</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 23, 2013, filed as Exhibit 10(d) to Form 10-Q for the quarter ended September 30, 2013, filed on November 7, 2013, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.17</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 31, 2013, filed as Exhibit 10(aa) to Form 10-K for the year ended December 31, 2013, filed on February 21, 2014, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.18</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated March 13, 2014, filed as Exhibit 10(b) to Form 10-Q for the quarter ended March 31, 2014, filed on May 7, 2014, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr></table></div></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-5</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:10%;"></td><td style="width:25%;"></td><td style="width:65%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.19</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated June 5, 2014, filed as Exhibit 10(a) to Form 10-Q for the quarter ended June 30, 2014, filed on August 8, 2014, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.20</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated July 7, 2014, filed as Exhibit 4.20 to Form S-8, filed on August 26, 2014, in Registration No. 333-198364.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.21</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated August 18, 2014, filed as Exhibit 4.21 to Form S-8, filed on August 26, 2014, in Registration No. 333-198364.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.22</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 30, 2014, filed as Exhibit 10(b) to Form 10-Q for the quarter ended September 30, 2014, filed on November 7, 2014, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.23</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated November 25, 2014, filed as Exhibit 10(ah) to Form 10-K for the year ended December 31, 2014, filed on February 20, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.24</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 11, 2014, filed as Exhibit 10(ai) to Form 10-K for the year ended December 31, 2014, filed on February 20, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.25</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 11, 2014, filed as Exhibit 10(aj) to Form 10-K for the year ended December 31, 2014, filed on February 20, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.26</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 30, 2014, filed as Exhibit 10(ak) to Form 10-K for the year ended December 31, 2014, filed on February 20, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.27</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated February 17, 2015, filed as Exhibit 10(a) to Form 10-Q for the quarter ended March 31, 2015, filed on May 8, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.28</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated March 13, 2015, filed as Exhibit 10(b) to Form 10-Q for the quarter ended March 31, 2015, filed on May 8, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.29</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated June 30, 2015, filed as Exhibit 10(a) to Form 10-Q for the quarter ended June 30, 2015, filed on August 4, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.30</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated November 19, 2015, filed as Exhibit 10(ap) to Form 10-K for the year ended December 31, 2015, filed on February 19, 2016, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.31</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated January 22, 2016, filed as Exhibit 10(c) to Form 10-Q for the quarter ended March 31, 2016, filed on May 6, 2016, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.32</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated March 10, 2016, filed as Exhibit 10(d) to Form 10-Q for the quarter ended March 31, 2016, filed on May 6, 2016, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">4.33</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated June 9, 2016.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-6</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:10%;"></td><td style="width:25%;"></td><td style="width:65%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">5.1</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Opinion of Daniel S. Kuntz, Esq., General Counsel to the Company.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">5.2</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Opinion of Duane Morris LLP, counsel to the Company.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">23.1</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Consent of Deloitte &amp; Touche LLP.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">23.2</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Consent of Baker Tilly Virchow Krause, LLP.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">23.3</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">The consents of Daniel S. Kuntz and Duane Morris LLP are contained in their opinions filed as Exhibits 5.1 and 5.2, respectively, hereto.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">24</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Power of Attorney (see signature pages).</font></div></td></tr><tr><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">_______________________</font></div></td></tr><tr><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*Previously filed and incorporated herein by reference.</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">We will submit or have submitted the MDU Resources Group, Inc. 401(k) Retirement Plan and any amendment thereto to the Internal Revenue Service (the &#8220;IRS&#8221;) in a timely manner and have made or will make all changes required by the IRS in order to qualify the plan, as amended, under Section 401 of the Internal Revenue Code.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Item 9. Undertakings.</font></div><div style="line-height:120%;padding-top:16px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(a)&#160;&#160;The undersigned registrant hereby undertakes:</font></div><div style="line-height:115%;padding-top:16px;text-align:left;padding-left:108px;text-indent:-108px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(1)&#160;&#160;&#160;To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:</font></div><div style="line-height:115%;padding-top:16px;text-align:left;padding-left:132px;text-indent:-132px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(i)&#160;&#160;To include any prospectus required by section 10(a)(3) of the Securities Act of 1933;</font></div><div style="line-height:115%;padding-top:16px;text-align:left;padding-left:132px;text-indent:-132px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(ii)&#160;To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Securities and Exchange Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate offering price set forth in the &#8220;Calculation of Registration Fee&#8221; table in the effective registration statement;</font></div><div style="line-height:115%;padding-top:16px;text-align:left;padding-left:132px;text-indent:-132px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(iii)&#160;&#160;To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement; </font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-7</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:115%;padding-top:16px;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-style:italic;">Provided, however</font><font style="font-family:inherit;font-size:12pt;">, That paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the registration statement is on Form S-8 and the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Securities and Exchange Commission by the registrant pursuant to section 13 or section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement.</font></div><div style="line-height:115%;padding-top:16px;text-align:left;padding-left:114px;text-indent:-114px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(2)&#160;&#160;That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial </font><font style="font-family:inherit;font-size:12pt;font-style:italic;">bona fide</font><font style="font-family:inherit;font-size:12pt;">&#32;offering thereof.</font></div><div style="line-height:120%;padding-top:16px;text-align:left;padding-left:114px;text-indent:-114px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(3)&#160;&#160;To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.</font></div><div style="line-height:120%;padding-top:16px;text-align:left;padding-left:78px;text-indent:-72px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(b)&#160;The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant&#8217;s annual report pursuant to section 13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan&#8217;s annual report pursuant to section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial </font><font style="font-family:inherit;font-size:12pt;font-style:italic;">bona fide</font><font style="font-family:inherit;font-size:12pt;">&#32;offering thereof.</font></div><div style="line-height:120%;text-align:left;padding-left:84px;text-indent:-84px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:84px;text-indent:-84px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;(h)&#160;&#160;Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.</font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-8</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">POWER OF ATTORNEY</font></div><div style="line-height:120%;text-align:center;padding-left:30px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:30px;text-indent:78px;font-size:12pt;"><font style="font-family:inherit;font-size:10pt;"></font><font style="font-family:inherit;font-size:12pt;">Each director and/or officer of the registrant whose signature appears below hereby&#160;appoints the agents for service named on the cover of this registration statement, and&#160;each&#160;of&#160;them severally, as his/her attorney-in-fact to sign in his/her name and behalf, in&#160;any&#160;and&#160;all capacities stated below, and to file with the Securities and Exchange Commission,&#160;any and all amendments, including post-effective amendments, to this registration&#160;statement, and the registrant hereby also appoints each such agent for service as&#160;its&#160;attorney-in-fact with like authority to sign and file any such amendment in its name and&#160;behalf.</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">SIGNATURES</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:30px;text-indent:78px;font-size:12pt;"><font style="font-family:inherit;font-size:10pt;"></font><font style="font-family:inherit;font-size:12pt;text-decoration:underline;">The Registrant</font><font style="font-family:inherit;font-size:12pt;">. Pursuant to the requirements of the Securities Act of 1933, the registrant&#160;certifies that it has reasonable grounds to believe that it meets all of the requirements&#160;for&#160;filing on Form S-8 and has duly caused this registration statement to be signed&#160;on&#160;its behalf by the undersigned, thereunto duly authorized, in the City of Bismarck,&#160;State&#160;of&#160;North Dakota, on the 21st day of July, 2016.</font></div><div style="line-height:100%;text-align:center;padding-left:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:81.62393162393163%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:53%;"></td><td style="width:6%;"></td><td style="width:41%;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU RESOURCES GROUP, INC.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">By:</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ David L. Goodin</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">David L. Goodin</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">President and</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:1px;padding-right:2px;"><div style="padding-bottom:1px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Chief Executive Officer</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;padding-left:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;padding-left:30px;text-indent:78px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Pursuant to the requirements of the Securities Act of 1933, this registration statement&#160;has been signed by the following persons in the capacities and on the dates indicated.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:center;padding-left:30px;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:95.2991452991453%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:46%;"></td><td style="width:32%;"></td><td style="width:22%;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;text-decoration:underline;">Signature</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;text-decoration:underline;">Title</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;text-decoration:underline;">Date</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:37px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:37px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:37px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ David L. Goodin</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Chief Executive Officer and </font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">David L. Goodin <br>(President and Chief Executive Officer)</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Doran N. Schwartz</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Chief Financial Officer</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Doran N. Schwartz <br>(Vice President and Chief Financial Officer)</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:8px;text-align:center;padding-left:30px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-9</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:center;padding-left:30px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;padding-left:30px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;padding-left:30px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:30px;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:95.08547008547008%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:46%;"></td><td style="width:32%;"></td><td style="width:22%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;text-decoration:underline;">Signature</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;text-decoration:underline;">Title</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;text-decoration:underline;">Date</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Jason L. Vollmer</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Chief Accounting Officer</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Jason L. Vollmer</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">(Vice President, Chief </font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Accounting Officer and Treasurer)</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:16px;padding-right:2px;"><div style="padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Harry J. Pearce          </font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Harry J. Pearce <br>(Chairman of the Board)</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Thomas Everist</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Thomas Everist</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Karen B. Fagg      </font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Karen B. Fagg</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Mark A. Hellerstein      </font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Mark A. Hellerstein</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ A. Bart Holaday             </font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">A. Bart Holaday</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Dennis W. Johnson      </font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Dennis W. Johnson</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ William E. McCracken      </font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">William E. McCracken</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:37px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:37px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:37px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Patricia L. Moss      </font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Patricia L. Moss</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ John K. Wilson      </font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">John K. Wilson</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-10</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">POWER OF ATTORNEY</font></div><div style="line-height:120%;text-align:center;padding-left:30px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:30px;text-indent:78px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">The MDU Resources Group, Inc. 401(k) Retirement Plan hereby appoints the agents&#160;for service named on the cover of this registration statement, and each of them severally, as its attorney-in-fact to sign in its name and behalf and to file with the Securities&#160;and Exchange Commission any and all amendments including post-effective amendments to this registration statement.</font></div><div style="line-height:120%;text-align:left;padding-left:30px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">SIGNATURES</font></div><div style="line-height:120%;text-align:left;padding-left:30px;text-indent:78px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"></font><font style="font-family:inherit;font-size:12pt;text-decoration:underline;">The Plan</font><font style="font-family:inherit;font-size:12pt;">.&#160;Pursuant to the requirements of the Securities Act of 1933, the MDU Resources Group, Inc. Employee Benefits Committee, which functions as the 401(k) Retirement Plan Committee, has duly caused this registration statement to be signed on its&#160;behalf by the undersigned, thereunto duly authorized, in the City of Bismarck, State of North Dakota, on the 21st day of July, 2016.</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:509px;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:261px;"></td><td style="width:32px;"></td><td style="width:216px;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU RESOURCES GROUP, INC.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">401(k) RETIREMENT PLAN</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">By:</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Doran N. Schwartz</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Doran N. Schwartz, Chairman</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU Resources Group, Inc.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Employee Benefits Committee</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-11</font></div></div><hr style="page-break-after:always"><div><a name="s41C2A528DDEAE810D96C9BE674ACA891"></a></div><div></div><div><br></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;text-decoration:underline;">EXHIBIT INDEX</font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:636px;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:65px;"></td><td style="width:160px;"></td><td style="width:410px;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.1</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Restated Certificate of Incorporation of MDU Resources Group, Inc., as amended, dated May 13, 2010, filed as Exhibit 3(a) to Form 10-Q for the quarter ended September 30, 2010, filed on November 3, 2010, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.2</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Bylaws of MDU Resources Group, Inc., as amended and restated on April 2, 2015, filed as Exhibit 3 to Form 10-Q for the quarter ended March 31, 2015, filed on May 8, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.3</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Indenture, dated as of December 15, 2003, between MDU Resources Group, Inc. and The Bank of New York, as trustee, filed as Exhibit 4(f) to Form S-8, on January 21, 2004, in Registration No. 333-112035.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.4</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">First Supplemental Indenture, dated as of November 17, 2009, between MDU Resources Group, Inc. and The Bank of New York Mellon, as trustee, filed as Exhibit 4(c) to Form 10-K for the year ended December 31, 2009, filed on February 17, 2010, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.5</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU Resources Group, Inc. 401(k) Retirement Plan, as restated March 1, 2011, filed as Exhibit 10(a) to Form 10-Q for the quarter ended September 30, 2011, filed on November 4, 2011, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.6</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated March 29, 2011, filed as Exhibit 10(b) to Form 10-Q for the quarter ended March 31, 2011, filed on May 5, 2011, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.7</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated June 30, 2011, filed as Exhibit 10(d) to Form 10-Q for the quarter ended June 30, 2011, filed on August 5, 2011, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.8</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 9, 2011, filed as Exhibit 10(b) to Form 10-Q for the quarter ended September 30, 2011, filed on November 4, 2011, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.9</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 29, 2011, filed as Exhibit 10(ac) to Form 10-K for the year ended December 31, 2011, filed on February 24, 2012, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.10</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated May 24, 2012, filed as Exhibit 10(b) to Form 10-Q for the quarter ended June 30, 2012, filed on August 7, 2012, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.11</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated August 29, 2012, filed as Exhibit 10(a) to Form 10-Q for the quarter ended September 30, 2012, filed on November 7, 2012, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.12</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated August 29, 2012, filed as Exhibit 10(b) to Form 10-Q for the quarter ended September 30, 2012, filed on November 7, 2012, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.13</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 19, 2012, filed as Exhibit 10(z) to Form 10-K for the year ended December 31, 2012, filed on February 28, 2013, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.14</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 9, 2013, filed as Exhibit 10(b) to Form 10-Q for the quarter ended September 30, 2013, filed on November 7, 2013, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr></table></div></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-</font><font style="font-family:inherit;font-size:10pt;">12</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:636px;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:65px;"></td><td style="width:160px;"></td><td style="width:410px;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.15</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 9, 2013, filed as Exhibit 10(c) to Form 10-Q for the quarter ended September 30, 2013, filed on November 7, 2013, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.16</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 23, 2013, filed as Exhibit 10(d) to Form 10-Q for the quarter ended September 30, 2013, filed on November 7, 2013, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.17</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 31, 2013, filed as Exhibit 10(aa) to Form 10-K for the year ended December 31, 2013, filed on February 21, 2014, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.18</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated March 13, 2014, filed as Exhibit 10(b) to Form 10-Q for the quarter ended March 31, 2014, filed on May 7, 2014, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.19</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated June 5, 2014, filed as Exhibit 10(a) to Form 10-Q for the quarter ended June 30, 2014, filed on August 8, 2014, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.20</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated July 7, 2014, filed as Exhibit 4.20 to Form S-8, filed on August 26, 2014, in Registration No. 333-198364.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.21</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated August 18, 2014, filed as Exhibit 4.21 to Form S-8, filed on August 26, 2014, in Registration No. 333-198364.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.22</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated September 30, 2014, filed as Exhibit 10(b) to Form 10-Q for the quarter ended September 30, 2014, filed on November 7, 2014, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.23</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated November 25, 2014, filed as Exhibit 10(ah) to Form 10-K for the year ended December 31, 2014, filed on February 20, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.24</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 11, 2014, filed as Exhibit 10(ai) to Form 10-K for the year ended December 31, 2014, filed on February 20, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.25</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 11, 2014, filed as Exhibit 10(aj) to Form 10-K for the year ended December 31, 2014, filed on February 20, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.26</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated December 30, 2014, filed as Exhibit 10(ak) to Form 10-K for the year ended December 31, 2014, filed on February 20, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.27</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated February 17, 2015, filed as Exhibit 10(a) to Form 10-Q for the quarter ended March 31, 2015, filed on May 8, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.28</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated March 13, 2015, filed as Exhibit 10(b) to Form 10-Q for the quarter ended March 31, 2015, filed on May 8, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.29</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated June 30, 2015, filed as Exhibit 10(a) to Form 10-Q for the quarter ended June 30, 2015, filed on August 4, 2015, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-</font><font style="font-family:inherit;font-size:10pt;">13</font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:636px;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:65px;"></td><td style="width:160px;"></td><td style="width:410px;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.30</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated November 19, 2015, filed as Exhibit 10(ap) to Form 10-K for the year ended December 31, 2015, filed on February 19, 2016, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.31</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated January 22, 2016, filed as Exhibit 10(c) to Form 10-Q for the quarter ended March 31, 2016, filed on May 6, 2016, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*4.32</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated March 10, 2016, filed as Exhibit 10(d) to Form 10-Q for the quarter ended March 31, 2016, filed on May 6, 2016, in File No. 1-3480.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">4.33</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Instrument of Amendment to the MDU Resources Group, Inc. 401(k) Retirement Plan, dated June 9, 2016.</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">5.1</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Opinion of Daniel S. Kuntz, Esq., General Counsel to the Company.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">5.2</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Opinion of Duane Morris LLP, counsel to the Company.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">23.1</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Consent of Deloitte &amp; Touche LLP.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">23.2</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Consent of Baker Tilly Virchow Krause, LLP.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">23.3</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">The consents of Daniel S. Kuntz and Duane Morris LLP are contained in their opinions filed as Exhibits 5.1 and 5.2, respectively, hereto.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">24</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Power of Attorney (see signature pages).</font></div></td></tr><tr><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">_____________________</font></div></td></tr><tr><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*Previously filed and incorporated herein by reference.</font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">II-</font><font style="font-family:inherit;font-size:10pt;">14</font></div></div><hr style="page-break-after:always"><div><a name="sbe0fc319ea924b758484dced4579ef73"></a></div><div></div><div><br></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div></div>	</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.33
<SEQUENCE>3
<FILENAME>exhibit433-2016401kamendme.htm
<DESCRIPTION>EXHIBIT 4.33
<TEXT>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<!-- Document created using Wdesk 1 -->
		<!-- Copyright 2016 Workiva -->
		<title>Wdesk | Exhibit</title>
	</head>
	<body style="font-family:Times New Roman;font-size:10pt;">
<div><a name="s55cdc19ac15a41469df3f22a7ca91b10"></a></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">EXHIBIT 4.33</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><hr style="page-break-after:always"><div><a name="s729D9ADB995247AA8371C7463924C4E4"></a></div><div><div style="line-height:120%;text-align:right;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:right;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Exhibit 4.33</font></div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;">INSTRUMENT OF AMENDMENT TO THE</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;">MDU RESOURCES GROUP, INC.</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;">401(k) RETIREMENT PLAN</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">The MDU Resources Group, Inc. 401(k) Retirement Plan (as amended and restated  March&#160;1,&#160;2011)&#160;(the &#8220;K-Plan&#8221;), is hereby further amended, as follows:</font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:30px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:12pt;padding-left:0px;"><font style="font-family:Arial;font-size:12pt;">1.</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Effective January 1, 2016, by replacing Section D-1-2 </font><font style="font-family:Arial;font-size:12pt;text-decoration:underline;">Eligibility to Share in the Profit Sharing Feature</font><font style="font-family:Arial;font-size:12pt;">&#32;of Supplement D-1, </font><font style="font-family:Arial;font-size:12pt;text-decoration:underline;">Provisions Relating to the Profit Sharing Feature for Certain Participating Affiliates</font><font style="font-family:Arial;font-size:12pt;">, in its entirety, with the following: </font></div></td></tr></table><div style="line-height:120%;text-align:justify;padding-left:24px;text-indent:-19px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;padding-left:30px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;text-decoration:underline;">Eligibility to Share in the Profit Sharing Feature.</font><font style="font-family:Arial;font-size:12pt;">&#32;&#32;Participation in the Profit Sharing Feature(s) for any Plan Year is limited to employees of the Supplement D-1 Company who satisfy the Plan&#8217;s definition of Eligible Employee (unless otherwise noted below).  The current and original effective dates for each Participating Affiliate&#8217;s respective Profit&#160;Sharing Feature are listed below.</font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:93.58974358974359%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:54%;"></td><td style="width:46%;"></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;text-decoration:underline;">Participating Affiliate</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;text-decoration:underline;">Current Effective Date</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;text-decoration:underline;">(Original Effective Date)</font><font style="font-family:Arial;font-size:12pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">2</sup></font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Ames Sand &amp; Gravel, Inc.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2016</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(July 16, 2007)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Anchorage Sand &amp; Gravel Company, Inc. (excluding President)</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 1999</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Baldwin Contracting Company, Inc.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 1999</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Capital Electric Line Builders, Inc.</font><font style="font-family:Arial;font-size:12pt;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">1</sup></font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2014</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Cascade Natural Gas Corporation</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2011</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(July 2, 2007)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Concrete, Inc.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2001</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Connolly-Pacific Co.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2007</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">DSS Company</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2004</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(July 8, 1999)</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;border-bottom:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">E.S.I., Inc.</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;border-bottom:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2008</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(January 1, 2003)</font></div></td></tr></table></div></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">1</font></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br></font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:93.58974358974359%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:54%;"></td><td style="width:46%;"></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;border-bottom:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;text-decoration:underline;">Participating Affiliate</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;border-bottom:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;text-decoration:underline;">Current Effective Date</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;text-decoration:underline;">(Original Effective Date)</font><font style="font-family:Arial;font-size:12pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">2</sup></font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Fairbanks Materials, Inc.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">May 1, 2008</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Granite City Ready Mix, Inc.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">June 1, 2002</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Great Plains Natural Gas Co.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2008</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Hawaiian Cement (non-union employees hired after December 31, 2005)</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2009</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Intermountain Gas Company</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2011</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">JTL Group, Inc.</font><font style="font-family:Arial;font-size:12pt;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">5/6</sup></font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2015</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(January 1, 2014)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Jebro Incorporated</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">November 1, 2005</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Kent&#8217;s Oil Service</font><font style="font-family:Arial;font-size:12pt;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">4</sup></font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2007</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Knife River &#8211; North Dakota Division, a Division of Knife River Corporation &#8211; North&#160;Central</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2016</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(January 1, 2007)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Knife River Corporation &#8211; North Central</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2016</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(January 1, 2007)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Knife River Corporation &#8211; Northwest (the Central Oregon Division, f/k/a HTS)</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2010</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(January 1, 1999)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Knife River Corporation &#8211; Northwest (the Idaho Division)</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2015</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Knife River Corporation &#8211; Northwest (the Southern Oregon Division)</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2012</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Knife River Corporation &#8211; Northwest (the Western Oregon Division)</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2012</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Knife River Corporation - South</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(f/k/a Young Contractors, Inc.)</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2008</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(January 1, 2007)</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;border-bottom:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Knife River Midwest, LLC</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;border-bottom:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2016</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(April 1, 2004)</font></div></td></tr></table></div></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">2</font></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br></font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:93.58974358974359%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:54%;"></td><td style="width:46%;"></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;border-bottom:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;text-decoration:underline;">Participating Affiliate</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;border-bottom:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;text-decoration:underline;">Current Effective Date</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;text-decoration:underline;">(Original Effective Date)</font><font style="font-family:Arial;font-size:12pt;font-weight:bold;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">2</sup></font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">LTM, Incorporated</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2003</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Montana-Dakota Utilities Co. (including union employees)</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #000000;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2008</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Northstar Materials, Inc.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2016</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(January 1, 2003)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">On Electric Group, Inc.</font><font style="font-family:Arial;font-size:12pt;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">3</sup></font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">March 7, 2011</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Wagner Industrial Electric, Inc.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2008</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Wagner Smith Equipment Co.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">January 1, 2008</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(July 1, 2000)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">WBI Energy, Inc.</font><font style="font-family:Arial;font-size:12pt;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">1/3</sup></font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">May 1, 2012</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">WBI Energy Midstream, LLC</font><font style="font-family:Arial;font-size:12pt;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">1/3</sup></font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">July 1, 2012</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(January 1, 2001)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">WBI Energy Transmission, Inc.</font><font style="font-family:Arial;font-size:12pt;"><sup style="vertical-align:top;line-height:120%;font-size:8pt">1/3</sup></font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">July 1, 2012</font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">(January 1, 2009)</font></div></td></tr><tr><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">WHC, Ltd.</font></div></td><td style="vertical-align:middle;border-bottom:1px solid #00000a;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #00000a;border-right:1px solid #00000a;border-top:1px solid #00000a;"><div style="text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">September 1, 2001</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:justify;padding-left:42px;text-indent:36px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;padding-left:42px;text-indent:36px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">1/</sup></font><font style="font-family:Arial;font-size:9pt;">Eligible employees participating in a management incentive compensation plan or an executive&#160;incentive compensation plan are not eligible for a Profit Sharing Contribution. Employees of the WBI Energy Corrosion Services division of WBI Energy Midstream, LLC are excluded from this feature.</font></div><div style="line-height:120%;text-align:justify;padding-left:42px;text-indent:36px;font-size:9pt;"><font style="font-family:Arial;font-size:9pt;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">2/</sup></font><font style="font-family:Arial;font-size:9pt;">In the event a Participating Affiliate adopts a Profit Sharing Feature on a date other than January&#160;1,&#160;effective as of the date of participation in the Plan, the amount of any such contribution allocated to a Supplement D&#8209;1 Participant shall be based upon Compensation, received while in the employ of the Participating Affiliate after the date of acquisition by the Company or any Affiliate.</font></div><div style="line-height:120%;text-align:justify;padding-left:48px;text-indent:30px;font-size:9pt;"><font style="font-family:Arial;font-size:9pt;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">3/</sup></font><font style="font-family:Arial;font-size:9pt;">Requirement to be an Active Employee on the last day of the Plan Year does not apply.</font></div><div style="line-height:120%;text-align:justify;padding-left:42px;text-indent:36px;font-size:9pt;"><font style="font-family:Arial;font-size:9pt;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">4/</sup></font><font style="font-family:Arial;font-size:9pt;">The following participant of Kent&#8217;s Oil Service is granted vesting service for prior years of service&#160;with Spirit Road Oils: Jose Padilla.</font></div><div style="line-height:120%;text-align:justify;padding-left:42px;text-indent:36px;font-size:9pt;"><font style="font-family:Arial;font-size:9pt;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">5/</sup></font><font style="font-family:Arial;font-size:9pt;">Eligible JTL Casper hourly employees (both union and nonunion), including those employees who participate in the Operating Engineers Local No. 800 &amp; The Wyoming Contractors&#8217; Association, Inc.&#160;Pension Trust Fund for Wyoming (JTL MEP employees.)</font></div><div style="line-height:120%;text-align:justify;padding-left:42px;text-indent:36px;font-size:9pt;"><font style="font-family:Arial;font-size:9pt;"><sup style="vertical-align:top;line-height:120%;font-size:6pt">6/</sup></font><font style="font-family:Arial;font-size:9pt;">Eligible salaried employees of JTL hired after December 31, 2014 or any other JTL employee who transfers to a salaried position after December 31, 2014.</font></div><div style="line-height:120%;text-align:justify;padding-left:138px;text-indent:-48px;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br></font></div><div style="line-height:120%;text-align:justify;text-indent:78px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">In order to share in the allocation of any profit sharing contribution made by a Supplement D-1 Company pursuant to Paragraph 3 below for a given Plan Year, Participants employed by a Supplement D-1 Company must be credited with 1,000 </font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">3</font></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br></font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Hours&#160;of&#160;Service (prorated for the Plan Year in which the Profit Sharing Feature becomes&#160;effective) in that Plan Year, be an Active Employee of the Supplement D-1 Company on the last day of the Plan Year, and must not be covered by a collectively bargained unit to which the Profit Sharing has not been extended.</font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;text-indent:78px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">However, an Eligible Employee of a Knife River Corporation Participating Affiliate who transfers during the Plan Year and remains employed by a Knife River Corporation Participating Affiliate on the last day of the Plan Year will be eligible to receive&#160;a&#160;prorated profit sharing contribution from each Knife River Corporation Participating Affiliate.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;text-indent:78px;font-size:12pt;"><font style="font-family:Arial;font-size:10pt;"></font><font style="font-family:Arial;font-size:12pt;">Moreover, effective January 1, 2009, an Eligible Employee of Montana-Dakota Utilities Co., Great Plains Natural Gas Co.,  Intermountain Gas Company, or Cascade&#160;Natural Gas Company (collectively the &#8220;Utility Group Participating Affiliate&#8221;) who&#160;transfers during the Plan Year and remains employed by a Utility Group Participating&#160;Affiliate on the last day of the Plan Year will be eligible to receive a prorated&#160;profit sharing contribution from each Utility Group Participating Affiliate noted above which meets its independent profitability targets.  </font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;text-indent:78px;font-size:12pt;"><font style="font-family:Arial;font-size:10pt;"></font><font style="font-family:Arial;font-size:12pt;">Effective January 1, 2014, it was resolved that Profit Sharing contributions for&#160;Eligible Employees of the Utility Group Participating Affiliates would be based upon the&#160;Utility Group Participating Affiliates combined profitability targets, and therefore, if the&#160;Utility Group Participating Affiliates together attained the required profitability, Eligible&#160;Employees of the Utility Group Participating Affiliates would receive a contribution&#160;as long as they remained employed by a Utility Group Participating Affiliate on the last day of the Plan Year.</font></div><div style="line-height:120%;text-align:justify;text-indent:78px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">&#160;&#160;&#160;&#160;</font></div><div style="line-height:120%;text-align:justify;text-indent:78px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">For purposes of this Supplement, an &#8220;Active Employee&#8221; means an employee who is still on the payroll, has been temporarily laid off, or who terminated employment due to Disability, death, or after attaining age 60 during such Plan Year, but does not mean&#160;an employee whose employment has been terminated effective on or before December 31 of that Plan Year.  In addition, for purposes of applying the requirement of completing 1,000 Hours of Service for the Plan Year, such requirement shall not apply to&#160;employees terminating after attaining age  60  provided they are not terminated for cause.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:justify;text-indent:78px;font-size:12pt;"><font style="font-family:Arial;font-size:10pt;"></font><font style="font-family:Arial;font-size:12pt;">Participants who meet the preceding requirements are referred to herein as &#8220;Supplement D-1 Participant.&#8221;</font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;text-decoration:underline;">Explanation:  This amendment recognizes that effective January 1, 2016, Ames Sand &amp; Gravel, Inc., Knife River &#8211; North Dakota Division, Knife River Corporation &#8211; North Central, Knife River Midwest, LLC and NorthStar Materials, Inc. are removing the deferral requirement for profit sharing contributions.  This amendment also recognizes the March 13, 2014 resolution combining Utility Group Participating Affiliate profitability targets and removing the requirement to prorate profit sharing contributions from each Utility Group Participating Affiliate based on its independent profitability targets, effective January 1, 2014.</font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:12pt;padding-left:0px;"><font style="font-family:Arial;font-size:12pt;">2.</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Effective January 1, 2016, by replacing Supplement D-3, </font><font style="font-family:Arial;font-size:12pt;text-decoration:underline;">Provisions Relating to the Profit Sharing Feature for Certain Participating Affiliates</font><font style="font-family:Arial;font-size:12pt;">, in its entirety, with the word RESERVED.</font></div></td></tr></table><div style="line-height:120%;text-align:justify;padding-left:48px;text-indent:48px;font-size:9pt;"><font style="font-family:Arial;font-size:9pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;text-decoration:underline;">Explanation: This supplement is removed as a result of standardizing profit sharing benefits of Ames Sand &amp; Gravel, Inc., Knife River &#8211; North Dakota Division, Knife River Corporation &#8211; North Central, Knife River Midwest, LLC and NorthStar Materials, Inc., effective January 1, 2016. This amendment also recognizes the resolution dated December 19, 2012 removing Knife River Midwest, LLC (Central Iowa Division) as a Participating Affiliate. </font></div><div style="line-height:120%;text-align:justify;padding-left:72px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:12pt;padding-left:0px;"><font style="font-family:Arial;font-size:12pt;">3.</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Effective June 9, 2016, by replacing the following entry for Ames Sand &amp; Gravel, Inc. on Schedule B to the K-Plan, in its entirety, with the following:</font></div></td></tr></table><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;padding-left:24px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Ames Sand &amp; Gravel, Inc. shall make supplemental contributions on behalf of its Davis-Bacon Employees in such amounts as may be necessary to satisfy the Prevailing Wage Law&#8217;s required fringe cost to the extent that the sum of the employer Matching and Profit Sharing Contributions, if any, for a period are insufficient to satisfy the Prevailing Wage Law&#8217;s required fringe cost pursuant to Supplement G.  Effective June 9, 2016, Ames Sand &amp; Gravel, Inc. does not have Davis-Bacon employees.</font></div><div style="line-height:120%;text-align:justify;padding-left:18px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;padding-left:24px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Effective as of May 1, 2010, and amended as of June 9, 2016.</font></div><div style="line-height:120%;text-align:justify;padding-left:72px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;text-decoration:underline;">Explanation: This amendment clarifies that effective June 9, 2016; Ames Sand &amp; Gravel, Inc. does not have employees qualified as Davis-Bacon employees.</font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:24px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:12pt;padding-left:0px;"><font style="font-family:Arial;font-size:12pt;">4.</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Effective November 19, 2012, by replacing the following entry for Knife River Midwest, LLC, Central Iowa Division (f/k/a Becker Gravel, Inc.) on Schedule B to the K-Plan, in its entirety, with the following:</font></div></td></tr></table><div style="line-height:120%;text-align:justify;padding-left:72px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;padding-left:24px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Knife River Midwest, LLC Central Iowa Division (f/k/a Becker Gravel, Inc.), shall make supplemental contributions on behalf of its Davis&#8209;Bacon Employees in such amounts as may be necessary to satisfy the required Prevailing Wage Law fringe cost to the extent that the sum of the employer Matching and Profit Sharing Contributions, if any, for a period are insufficient to satisfy the required Prevailing Wage Law fringe cost pursuant to Supplement G.  Effective November 19, 2012, Knife River Midwest, LLC sold the assets of Knife River Midwest, LLC Central Iowa Division.</font></div><div style="line-height:120%;text-align:justify;padding-left:72px;text-indent:-72px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;padding-left:18px;text-indent:6px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Effective as of January 1, 2012, and amended as of November 19, 2012.</font></div><div style="line-height:120%;text-align:justify;padding-left:18px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;text-decoration:underline;">Explanation: This amendment clarifies that provisions for Knife River Midwest, LLC Central Iowa Division Davis-Bacon employees ended as of November 19, 2012, as the result of the sale of assets of this division.</font></div><div style="line-height:120%;text-align:justify;padding-left:18px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;padding-left:18px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">4</font></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br></font></div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:justify;text-indent:30px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">IN WITNESS WHEREOF, MDU Resources Group, Inc., as Sponsoring Employer of the K-Plan, has caused this amendment to be duly executed by a member of the MDU Resources Group, Inc. Employee Benefits Committee on this 9th day of June, 2016.</font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:right;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;text-align:-moz-right;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:365px;border-collapse:collapse;text-align:left;margin-left:auto;margin-right:0;"><tr><td colspan="3"></td></tr><tr><td style="width:37px;"></td><td style="width:164px;"></td><td style="width:164px;"></td></tr><tr><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">MDU RESOURCES GROUP, INC.</font></div></td></tr><tr><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">&#160;&#160;EMPLOYEE BENEFITS COMMITTEE</font></div></td></tr><tr><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:21px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:21px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">By:</font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">/s/ Doran N. Schwartz</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;padding-left:48px;text-indent:-48px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;">Doran N. Schwartz, Chairman</font></div></td></tr></table></div></div><div style="line-height:180%;text-align:justify;padding-left:48px;text-indent:-48px;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">5</font></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br></font></div></div><hr style="page-break-after:always"><div><a name="s8bce3e25f6674f9aa95814deafe2d340"></a></div><div></div><div><br></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div></div>	</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>4
<FILENAME>exhibit51-2016sx8dskopinion.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<!-- Document created using Wdesk 1 -->
		<!-- Copyright 2016 Workiva -->
		<title>Wdesk | Exhibit</title>
	</head>
	<body style="font-family:Times New Roman;font-size:10pt;">
<div><a name="s83CC4616E8D086DF60D69BE6779A7A0C"></a></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">EXHIBIT 5.1</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><hr style="page-break-after:always"><div><a name="s73D486346D9360D02AE49BE67394467F"></a></div><div><div style="line-height:120%;padding-left:30px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:right;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Exhibit 5.1</font></div></div><div><br></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">[Letterhead of Daniel S. Kuntz]</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:288px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#160;&#160;&#160;&#160;</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">&#32;&#32;&#32;&#32;&#32;&#32;&#32;&#32;&#32;&#32;&#32;July 21, 2016</font></div><div style="line-height:120%;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:50%;border-collapse:collapse;text-align:left;"><tr><td colspan="1"></td></tr><tr><td style="width:100%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU Resources Group, Inc.</font></div><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">1200 W. Century Avenue </font></div><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">P.O. Box 5650</font></div><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Bismarck, North Dakota 58506-5650</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;padding-left:144px;text-indent:-48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Ladies and Gentlemen:</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">I am General Counsel and Secretary of MDU Resources Group, Inc., a Delaware corporation&#160;(the &#8220;Company&#8221;). This opinion is being furnished in connection with the registration statement on Form S-8 (the &#8220;Registration Statement&#8221;) to be filed on or about the date hereof with the Securities and Exchange Commission (the &#8220;Commission&#8221;) by the Company under the Securities&#160;Act of 1933, as amended (the &#8220;Securities Act&#8221;), for the registration of 4,500,000 shares&#160;(the &#8220;Shares&#8221;) of the Company&#8217;s common stock, par value $1.00 per share, for offer and sale&#160;pursuant to the MDU Resources Group, Inc. 401(k) Retirement Plan (the &#8220;Plan&#8221;).</font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">For purposes of this opinion, I have examined such instruments, certificates, records and documents, and such matters of law, as I have considered necessary or appropriate for the purposes&#160;hereof.</font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Based upon and subject to the foregoing, and subject to the further limitations and qualifications expressed below, I am of the opinion that: </font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:12pt;padding-left:48px;"><font style="font-family:inherit;font-size:12pt;">1.</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">The issuance and sale of original issuance Shares in the manner contemplated by the Plan has been duly authorized by the Board of Directors of the Company.</font></div></td></tr></table><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:96px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:12pt;padding-left:48px;"><font style="font-family:inherit;font-size:12pt;">2.</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">When the original issuance Shares shall have been issued, sold and delivered (i) in compliance with the authority contained in the regulatory consents and approvals of&#160;the&#160;Federal Energy Regulatory Commission, the Montana Public Service Commission&#160;and the Wyoming Public&#160;Service Commission and (ii) in accordance with the terms and provisions of the Plan and for the consideration contemplated thereby, such original issuance Shares will be validly issued, fully paid and non-assessable.</font></div></td></tr></table><div><br></div><div></div><hr style="page-break-after:always"><div></div><div><br></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU Resources Group, Inc.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Page 2</font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">My opinions expressed above are limited to the General Corporation Law of the State of Delaware, except to the extent such opinions involve determinations regarding regulatory consents&#160;and approvals required to be obtained by the Company from any state or federal governmental body or bodies in connection with the issuance and sale of the original issuance Shares.  As to matters of the General Corporation Law of the State of Delaware, I have relied on the opinion of Duane Morris LLP, counsel to the Company, dated July 21, 2016, which opinion&#160;is&#160;to be filed as an exhibit to the Registration Statement.</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">I hereby consent to the filing of this opinion as an exhibit to the Registration Statement and&#160;to the references to me contained under the heading &#8220;Interests of Named Experts and Counsel&#8221;&#160;in&#160;the Registration Statement and any amendments thereto. In giving such consent, I do not thereby concede that I am within the category of persons whose consent is required under Section&#160;7 of the Securities Act or the rules and regulations of the Commission thereunder.</font></div><div style="line-height:120%;text-align:right;padding-left:288px;text-indent:-288px;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;text-align:-moz-right;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:53.84615384615385%;border-collapse:collapse;text-align:left;margin-left:auto;margin-right:0;"><tr><td colspan="1"></td></tr><tr><td style="width:100%;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Very truly yours,</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Daniel S. Kuntz</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:21px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Daniel S. Kuntz</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">General Counsel and Secretary</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td></tr></table></div></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:384px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:right;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">2</font></div></div><hr style="page-break-after:always"><div><a name="s57655097f40049a594b4e36ea4acf8e7"></a></div><div></div><div><br></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div></div>	</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.2
<SEQUENCE>5
<FILENAME>exhibit52-2016sx8dmopinion.htm
<DESCRIPTION>EXHIBIT 5.2
<TEXT>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<!-- Document created using Wdesk 1 -->
		<!-- Copyright 2016 Workiva -->
		<title>Wdesk | Exhibit</title>
	</head>
	<body style="font-family:Times New Roman;font-size:10pt;">
<div><a name="s84312688829244EA92989BE6786C8198"></a></div><div></div><div><br></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">EXHIBIT 5.2</font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div><br></div><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><a name="s5B2A5B93BCC46D20E2159BE6788AB326"></a></div><div><div style="line-height:120%;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:right;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Exhibit 5.2</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><div><br></div><div style="line-height:120%;padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">[Letterhead of Duane Morris LLP]</font></div><div style="line-height:120%;padding-bottom:24px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:24px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div><div style="line-height:120%;padding-bottom:24px;text-align:left;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:64.52991452991454%;border-collapse:collapse;text-align:left;"><tr><td colspan="1"></td></tr><tr><td style="width:100%;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU Resources Group, Inc.</font></div><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">1200 West Century Avenue, P.O. Box 5650</font></div><div style="font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Bismarck, North Dakota  58506-5650</font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:16px;padding-top:8px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Ladies and Gentlemen:</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">We are acting as counsel to MDU Resources Group, Inc., a Delaware corporation (the &#8220;Company&#8221;), in connection with the preparation and filing with the Securities and Exchange Commission (the &#8220;Commission&#8221;) under the Securities Act of 1933, as amended (the &#8220;Securities Act&#8221;), of the Company&#8217;s registration statement on Form S-8 (the &#8220;Registration Statement&#8221;) for the registration of 4,500,000 shares (the &#8220;Shares&#8221;) of common stock, par value $1.00 per share, of the Company to be issued and sold pursuant to the Company&#8217;s 401(k) Retirement Plan (the &#8220;Plan&#8221;).</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">For purposes of this opinion, we have examined such instruments, certificates, records and documents, and such matters of law, as we have considered necessary or appropriate for the purposes hereof.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Based upon and subject to the foregoing, and subject to the further limitations and qualifications expressed below, we are of the opinion that: </font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:10pt;"></font><font style="font-family:inherit;font-size:12pt;">1.  The issuance and sale of original issuance Shares in the manner contemplated by the Plan has been duly authorized by the Board of Directors of the Company.</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:10pt;"></font><font style="font-family:inherit;font-size:12pt;">2.  When the original issuance Shares shall have been issued, sold and delivered in accordance with the terms and provisions of the Plan and for the consideration contemplated thereby, such original issuance Shares will be validly issued, fully paid and non-assessable.</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:16px;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">For purposes of the opinion expressed in paragraph 2 above, we have assumed that (i) the Company has or will have obtained such state or federal regulatory consents and approvals as may be necessary to authorize the issuance and sale of the original issuance Shares pursuant to the Plan, including, but not limited to, regulatory consents and approvals from the Federal</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:16px;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div><br></div><div></div><hr style="page-break-after:always"><div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU Resources Group, Inc.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Page 2</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><div><br></div><div style="line-height:120%;padding-bottom:8px;padding-top:16px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Energy Regulatory Commission, the Montana Public Service Commission and the Wyoming Public Service Commission, and (ii) such original issuance Shares will be issued, sold and delivered in compliance with the authority contained in such regulatory consents and approvals.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Our opinions expressed above are limited to the General Corporation Law of the State of Delaware.</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the references to our firm contained under the heading &#8220;Interests of Named Experts and Counsel&#8221; in the Registration Statement and any amendments thereto. In giving such consent, we do not thereby concede that we are within the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission thereunder.</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;text-indent:48px;font-size:12pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:531px;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:264px;"></td><td style="width:266px;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Very truly yours,</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Duane Morris LLP</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:21px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:21px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:17px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:17px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:justify;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;padding-left:384px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:right;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><a name="s3be351d7524742af85b77af505c3e100"></a></div><div></div><div><br></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div></div>	</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>6
<FILENAME>exhibit231-2016sx8dtconsent.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<!-- Document created using Wdesk 1 -->
		<!-- Copyright 2016 Workiva -->
		<title>Wdesk | Exhibit</title>
	</head>
	<body style="font-family:Times New Roman;font-size:10pt;">
<div><a name="s2EFD01B49419559D4DBC9BE679345767"></a></div><div></div><div><br></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">EXHIBIT 23.1</font></div><div><br></div><div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:right;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Exhibit 23.1</font></div></div><div><br></div><div style="line-height:120%;padding-bottom:8px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:8px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:8px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:8px;text-align:center;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:Arial;font-size:12pt;font-weight:bold;">CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM</font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">We consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports dated February 19, 2016 relating to the consolidated financial statements and financial statement schedules of MDU Resources Group, Inc. and subsidiaries, and the effectiveness of MDU Resources Group, Inc. and subsidiaries' internal control over financial reporting appearing in the Annual Report&#160;on Form 10-K of MDU Resources Group, Inc. for the year ended December 31, 2015, and to the reference to us under the heading &#8220;Interests of Named Experts and Counsel&#8221; in this Registration Statement.</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-top:8px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Deloitte &amp; Touche LLP</font></div><div style="line-height:120%;padding-top:8px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-top:16px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Minneapolis, Minnesota</font></div><div style="line-height:120%;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div></div><hr style="page-break-after:always"><div><a name="sf9798913ff00443db2eece48723bc573"></a></div><div></div><div><br></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div></div>	</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>7
<FILENAME>exhibit232-2016sx8consento.htm
<DESCRIPTION>EXHIBIT 23.2
<TEXT>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<!-- Document created using Wdesk 1 -->
		<!-- Copyright 2016 Workiva -->
		<title>Wdesk | Exhibit</title>
	</head>
	<body style="font-family:Times New Roman;font-size:10pt;">
<div><a name="s8FED393A351FB3A03D899BE679D476E4"></a></div><div></div><div><br></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">EXHIBIT 23.2</font></div><div><br></div><div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:right;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Exhibit 23.2</font></div></div><div><br></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">[Letterhead of Baker Tilly Virchow Krause, LLP]</font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">We consent to the incorporation by reference in this Registration Statement of MDU Resources Group, Inc. on Form S-8 of (i) our report dated June 17, 2016 relating to the statements of net assets available for benefits of MDU Resources Group, Inc. 401(k) Retirement Plan as of December 31, 2015 and 2014 and the related statement of changes in net assets available for benefits for the year ended December 31, 2015, appearing in the Annual Report on Form 11-K of the MDU Resources Group, Inc. 401(k) Retirement Plan for the year ended December 31, 2015 and (ii) to the reference to us under the heading &#8220;Interests of Named Experts and Counsel&#8221; in this Registration Statement.</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-top:8px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">/s/ Baker Tilly Virchow Krause, LLP</font></div><div style="line-height:120%;padding-top:8px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-top:8px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Minneapolis, Minnesota</font></div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">July 21, 2016</font></div><div style="line-height:120%;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div></div>	</body>
</html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
