<SEC-DOCUMENT>0000067716-15-000037.txt : 20150319
<SEC-HEADER>0000067716-15-000037.hdr.sgml : 20150319
<ACCEPTANCE-DATETIME>20150319115713
ACCESSION NUMBER:		0000067716-15-000037
CONFORMED SUBMISSION TYPE:	S-8 POS
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20150319
DATE AS OF CHANGE:		20150319
EFFECTIVENESS DATE:		20150319

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 POS
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-158572
		FILM NUMBER:		15712144

	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 POS
<SEQUENCE>1
<FILENAME>s-8posteffectiveamendment.htm
<DESCRIPTION>S-8 POS
<TEXT>
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		<title>Wdesk | S-8 Post Effective Amendment</title>
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<a name="s8280020B22A0CB891EC2FEF56A07D50A"></a><div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></div><br><div style="line-height:120%;text-align:center;font-size:11pt;"><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="5"></td></tr><tr><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></td></tr><tr><td colspan="5" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;font-weight:bold;">As filed with the Securities and Exchange Commission on March 19, 2015</font></div><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></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;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;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;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;font-weight:bold;">Registration No. 333-158572</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">UNITED STATES</font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">SECURITIES AND EXCHANGE COMMISSION</font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">WASHINGTON, D.C. 20549</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:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="5"></td></tr><tr><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></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 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 style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><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;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;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%;text-align:center;font-size:16pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">POST-EFFECTIVE AMENDMENT NO. 1 TO</font><font style="font-family:inherit;font-size:10pt;">&#32;<br></font><font style="font-family:inherit;font-size:16pt;font-weight:bold;">FORM S-8</font><font style="font-family:inherit;font-size:10pt;">&#32;</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 style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">REGISTRATION STATEMENT <br>UNDER <br>THE SECURITIES ACT OF 1933</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:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="5"></td></tr><tr><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></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:5px;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:5px;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;border-top:1px solid #000000;"><div style="overflow:hidden;height:5px;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:5px;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:5px;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: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%;padding-bottom:8px;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:83.85026737967914%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td width="36%"></td><td width="32%"></td><td width="32%"></td></tr><tr><td style="vertical-align:top;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;">(State or other jurisdiction of</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">incorporation or organization)</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">&#160;&#160;&#160;</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:top;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:10pt;"><font style="font-family:inherit;font-size:10pt;">(I.R.S. Employer</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">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: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:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="5"></td></tr><tr><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></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:5px;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:5px;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;border-top:1px solid #000000;"><div style="overflow:hidden;height:5px;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:5px;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:5px;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:center;font-size:16pt;"><font style="font-family:inherit;font-size:16pt;font-weight:bold;">MDU RESOURCES GROUP, INC. <br>401(k) RETIREMENT PLAN</font><font style="font-family:inherit;font-size:10pt;">&#32;<br>(Full title of the plan)</font><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="5"></td></tr><tr><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></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:5px;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:5px;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;border-top:1px solid #000000;"><div style="overflow:hidden;height:5px;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:5px;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:5px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div><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 width="34%"></td><td width="33%"></td><td width="33%"></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:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">David L. Goodin</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">President and</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Chief Executive Officer </font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">MDU Resources Group, Inc.</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1200 West Century Avenue</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Bismarck, North Dakota 58506-5650</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(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:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Doran N. Schwartz</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Vice President and</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Chief Financial Officer</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">MDU Resources Group, Inc.</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1200 West Century Avenue</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Bismarck, North Dakota 58506-5650</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(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:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Elizabeth W. Powers, Esq.</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Duane Morris LLP</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1540 Broadway</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">New York, New York 10036</font></div><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(212) 692-1000</font></div></td></tr><tr><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:8px;padding-right:2px;"><div style="padding-bottom:8px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(Name, address and telephone number, including area code, of agents for service)</font></div></td></tr></table></div><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="5"></td></tr><tr><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></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:5px;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:5px;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;border-top:1px solid #000000;"><div style="overflow:hidden;height:5px;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:5px;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:5px;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:4px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">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><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:526px;border-collapse:collapse;text-align:left;"><tr><td colspan="6"></td></tr><tr><td width="65px"></td><td width="114px"></td><td width="86px"></td><td width="42px"></td><td width="138px"></td><td width="77px"></td></tr><tr><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:10pt;"><font style="font-family:inherit;font-size:10pt;">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:12pt;"><font style="font-family:Wingdings;font-size:12pt;">x</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:10pt;"><font style="font-family:inherit;font-size:10pt;">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:12pt;"><font style="font-family:Wingdings;font-size:12pt;">&#168;</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="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">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:12pt;"><font style="font-family:Wingdings;font-size:12pt;">&#168;</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:10pt;"><font style="font-family:inherit;font-size:10pt;">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:12pt;"><font style="font-family:Wingdings;font-size:12pt;">&#168;</font></div></td></tr></table></div><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="5"></td></tr><tr><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></td><td width="20%"></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:5px;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:5px;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:5px;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:5px;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:5px;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:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><br><div></div><hr style="page-break-after:always"><a name="s8060483845492BE191A8FEF56A55DFDE"></a><div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">DEREGISTRATION OF SECURITIES</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;">MDU Resources Group, Inc. filed a registration statement on Form S-8, Registration No. 333-158572, with the Securities and Exchange Commission on April 14, 2009, to register 3,000,000 shares of common stock, par value $1.00 per share, and an indeterminate amount of interests to be offered and sold pursuant to the MDU Resources Group, Inc. 401(k) Retirement Plan.  In accordance with its undertaking in Part II, Item 9(a)(3) of the registration statement, MDU Resources Group, Inc. hereby amends the registration statement to remove from registration the 531,094 shares of common stock and plan interests that remain unsold at the date hereof.</font></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;">II-1</font></div></div><hr style="page-break-after:always"><a name="s8060483845492BE191A8FEF56A55DFDE"></a><div><div style="line-height:120%;text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Item 8. &#160;&#160;&#160;&#160;Exhibits.</font></div><div style="line-height:120%;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:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td width="10%"></td><td width="25%"></td><td width="65%"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:8px;padding-bottom:8px;padding-right:2px;"><div style="padding-bottom:8px;text-align:left;text-indent:6px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*24</font></div></td><td colspan="2" style="vertical-align:middle;padding-left:2px;padding-top:8px;padding-bottom:8px;padding-right:2px;"><div style="padding-bottom:8px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Power of Attorney, filed as Exhibit 24 to Form S-8, on April 14, 2009, in Registration&#160;No. 333-158572.</font></div></td></tr><tr><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="overflow:hidden;height:9px;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:9px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:8px;padding-bottom:8px;padding-right:2px;"><div style="padding-bottom:8px;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:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></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;">II-2</font></div></div><hr style="page-break-after:always"><a name="s8060483845492BE191A8FEF56A55DFDE"></a><div><div style="line-height:120%;text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;padding-top:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">SIGNATURES</font></div><div style="line-height:120%;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"></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 certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this post-effective amendment to the registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Bismarck, State of North Dakota, on the 18th day of March, 2015.</font></div><div style="line-height:120%;text-align:center;padding-left:289px;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:49.76851851851852%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td width="11%"></td><td width="89%"></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:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU RESOURCES GROUP, INC.</font></div><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:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:20px;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:20px;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:20px;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:20px;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:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">By:</font></div></td><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: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="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: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="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: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="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: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:left;padding-left:288px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:left;text-indent:48px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Pursuant to the requirements of the Securities Act of 1933, this post-effective amendment to the registration statement has been signed by the following persons in the capacities and on the dates indicated.</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:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td width="46%"></td><td width="36%"></td><td width="18%"></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><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><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: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="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><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><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/ David L. Goodin</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Chief Executive Officer and Director</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;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></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/ Doran N. Schwartz</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Chief Financial Officer</font></div><div style="padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;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></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/ Nathan W. Ring</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-bottom:16px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Chief Accounting Officer</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Nathan W. Ring <br>(Vice President, Controller and Chief <br>Accounting Officer)</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;">*</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</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></tr></table></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;">II-3</font></div></div><hr style="page-break-after:always"><a name="s8060483845492BE191A8FEF56A55DFDE"></a><div><div style="line-height:120%;text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><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:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td width="46%"></td><td width="36%"></td><td width="18%"></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><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><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: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: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;">*</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Thomas Everist</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;">*</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Karen B. Fagg</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="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td rowspan="2" 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:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Mark A. Hellerstein</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;">*</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">A. Bart Holaday</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;">*</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Dennis W. Johnson</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="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td rowspan="2" 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:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;border-top:1px solid #000000;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">William E. McCracken</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;">*</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;border-top:1px solid #000000;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Patricia L. Moss</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;">*</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Director</font></div></td><td rowspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">March 18, 2015</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:24px;padding-right:2px;"><div style="padding-bottom:24px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">John K. Wilson</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;">*By:&#160;/s/ Elizabeth W. Powers</font></div></td><td rowspan="2" 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 rowspan="2" 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 rowspan="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;">Elizabeth W. Powers, as </font></div><div style="text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Attorney-in-Fact</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:73px;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:73px;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:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></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;">II-4</font></div></div><hr style="page-break-after:always"><a name="sC12A9C0BD7F2337C5947FEF56A84DF25"></a><div><div style="line-height:120%;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div></div><br><div style="line-height:120%;padding-top:8px;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">SIGNATURES</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:left;text-indent:48px;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;">.  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 post-effective amendment to the registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Bismarck, State of North Dakota, on the 18th day of March, 2015.</font></div><div style="line-height:120%;text-align:center;padding-left:288px;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:53.68983957219251%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td width="10%"></td><td width="90%"></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:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">MDU RESOURCES GROUP, INC.</font></div><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:20px;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:20px;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:20px;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:20px;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:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">By:</font></div></td><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: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:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><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: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.</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: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;">Employee Benefits Committee</font></div><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%;padding-bottom:8px;padding-top:8px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></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;">II-5</font></div></div><hr style="page-break-after:always"><a name="sDC116E1C04461E656E0DFEF56AE137FE"></a><div><div style="line-height:120%;text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><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%;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:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td width="10%"></td><td width="25%"></td><td width="65%"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:8px;padding-bottom:8px;padding-right:2px;"><div style="padding-bottom:8px;text-align:left;text-indent:6px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">*24</font></div></td><td colspan="2" style="vertical-align:middle;padding-left:2px;padding-top:8px;padding-bottom:8px;padding-right:2px;"><div style="padding-bottom:8px;text-align:left;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">Power of Attorney, filed as Exhibit 24 to Form S-8, on April 14, 2009, in Registration No. 333-158572.</font></div></td></tr><tr><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="overflow:hidden;height:9px;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:9px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td colspan="3" style="vertical-align:middle;padding-left:2px;padding-top:8px;padding-bottom:8px;padding-right:2px;"><div style="padding-bottom:8px;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:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"><br></font></div><br><div><div style="line-height:120%;text-align:center;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;">II-6</font></div></div>	</body>
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