    <SEC-DOCUMENT>0001466593-23-000081-index.html : 20230307
    <SEC-HEADER>0001466593-23-000081.hdr.sgml : 20230307
    <ACCEPTANCE-DATETIME>20230307130625
    ACCESSION NUMBER:		0001466593-23-000081
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20230307
    DATE AS OF CHANGE:		20230307

    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:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-53713
    		FILM NUMBER:		23711904

    	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>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>a2023proxy-noticeofinterne.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: a2023proxy-noticeofinterne.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>ottertailcorporation_vxnax.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: ottertailcorporation_vxnax.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>ottertailcorporation_vxnaxa.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: ottertailcorporation_vxnaxa.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>