<SEC-DOCUMENT>0001466593-21-000003-index.html : 20210216
<SEC-HEADER>0001466593-21-000003.hdr.sgml : 20210216
<ACCEPTANCE-DATETIME>20210216092335
ACCESSION NUMBER:		0001466593-21-000003
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		16
CONFORMED PERIOD OF REPORT:	20210215
ITEM INFORMATION:		Results of Operations and Financial Condition
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20210216
DATE AS OF CHANGE:		20210216

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Otter Tail Corp
		CENTRAL INDEX KEY:			0001466593
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				270383995
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-53713
		FILM NUMBER:		21633300

	BUSINESS ADDRESS:	
		STREET 1:		215 S CASCADE ST
		STREET 2:		PO BOX 496
		CITY:			FERGUS FALLS
		STATE:			MN
		ZIP:			56538-0496
		BUSINESS PHONE:		866-410-8780

	MAIL ADDRESS:	
		STREET 1:		215 S CASCADE ST
		STREET 2:		PO BOX 496
		CITY:			FERGUS FALLS
		STATE:			MN
		ZIP:			56538-0496

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Otter Tail Holding Co
		DATE OF NAME CHANGE:	20090618
</SEC-HEADER>
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<TYPE>8-K
<SEQUENCE>1
<FILENAME>ottr-20210215.htm
<DESCRIPTION>8-K
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Document 1 - file: ottr-20210215.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-99.1 <SEQUENCE>2 <FILENAME>q42020earningsreleaseex991.htm <DESCRIPTION>EX-99.1 <TEXT> Document 2 - file: q42020earningsreleaseex991.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-101.SCH <SEQUENCE>3 <FILENAME>ottr-20210215.xsd <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT <TEXT> Document 3 - file: ottr-20210215.xsd
</DOCUMENT> <DOCUMENT> <TYPE>EX-101.CAL <SEQUENCE>4 <FILENAME>ottr-20210215_cal.xml <DESCRIPTION>XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT <TEXT> Document 4 - file: ottr-20210215_cal.xml
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</DOCUMENT> <DOCUMENT> <TYPE>EX-101.LAB <SEQUENCE>6 <FILENAME>ottr-20210215_lab.xml <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT <TEXT> Document 6 - file: ottr-20210215_lab.xml
</DOCUMENT> <DOCUMENT> <TYPE>EX-101.PRE <SEQUENCE>7 <FILENAME>ottr-20210215_pre.xml <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT <TEXT> Document 7 - file: ottr-20210215_pre.xml
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</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>9 <FILENAME>ottr-20210215_htm.xml <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 9 - file: ottr-20210215_htm.html
Document 9 - RAW XML: ottr-20210215_htm.xml
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</DOCUMENT> <DOCUMENT> <TYPE>EXCEL <SEQUENCE>11 <FILENAME>Financial_Report.xlsx <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 11 - file: Financial_Report.xlsx
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Document 14 - RAW XML: FilingSummary.xml
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</DOCUMENT> <DOCUMENT> <TYPE>ZIP <SEQUENCE>18 <FILENAME>0001466593-21-000003-xbrl.zip <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 18 - file: 0001466593-21-000003-xbrl.zip
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