<SEC-DOCUMENT>0001466593-21-000061.txt : 20210902
<SEC-HEADER>0001466593-21-000061.hdr.sgml : 20210902
<ACCEPTANCE-DATETIME>20210902061719
ACCESSION NUMBER:		0001466593-21-000061
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		14
CONFORMED PERIOD OF REPORT:	20210901
ITEM INFORMATION:		Other Events
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20210902
DATE AS OF CHANGE:		20210902

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:		211231670

	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>8-K
<SEQUENCE>1
<FILENAME>ottr-20210901.htm
<DESCRIPTION>8-K
<TEXT>
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xlink:href="ottr-20210901.xsd"></link:schemaRef></ix:references><ix:resources><xbrli:context id="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0001466593</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2021-09-01</xbrli:startDate><xbrli:endDate>2021-09-01</xbrli:endDate></xbrli:period></xbrli:context></ix:resources></ix:header></div><div id="ib3441a02aeea43a78a2010d36ab13e35_1"></div><div style="min-height:54pt;width:100%"><div><span><br/></span></div></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:12pt;font-weight:700;line-height:120%">UNITED STATES</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:12pt;font-weight:700;line-height:120%">SECURITIES AND EXCHANGE COMMISSION</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">WASHINGTON, D.C. 20549</span></div><div style="margin-top:9pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:18pt;font-weight:700;line-height:120%">FORM&#160;<ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" name="dei:DocumentType" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzIx_d6cae4a9-ea1c-4ab4-b531-646b2eaa4cf2">8-K</ix:nonNumeric></span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">CURRENT REPORT</span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934</span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Date of report (Date of earliest event reported):&#160;<ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" format="ixt:date-monthname-day-year-en" name="dei:DocumentPeriodEndDate" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzIy_b817566a-8d82-4e6b-86b8-8e7ee83eae3a">September 1, 2021</ix:nonNumeric></span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:24pt;font-weight:700;line-height:120%"><ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" name="dei:EntityRegistrantName" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzEz_52e558c2-91c2-4d96-a010-083cf5cf6cae">OTTER TAIL CORPORATION</ix:nonNumeric></span></div><div style="margin-bottom:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Exact name of registrant as specified in its charter)</span></div><div><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:32.233%"></td><td style="width:0.1%"></td><td 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style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(Commission File Number)</span></div></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:100%"><ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" name="dei:EntityTaxIdentificationNumber" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGFibGU6MzBjNDhmMGI2YTA1NGRmZmE2ZmUzNzk5YjFjNDE3ZTEvdGFibGVyYW5nZTozMGM0OGYwYjZhMDU0ZGZmYTZmZTM3OTliMWM0MTdlMV8wLTItMS0xLTAvdGV4dHJlZ2lvbjpmMTY0NjNiZGU5YTQ0ODA4YmE5YjM0OWI3NTVlNzlmNl80_4e2cedbf-fef6-472f-b542-b9695e95c141">27-0383995</ix:nonNumeric></span></div><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(I.R.S. Employer Identification No.)</span></div></td></tr></table></div><div style="margin-top:4pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%"><ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" name="dei:EntityAddressAddressLine1" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzA4_c26ce422-9679-4a32-8e03-1ee6310eff1b">215 South Cascade Street,&#160;P.O. 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id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzE1_23892123-f4f1-4394-8790-ebf1a3afa604">&#9744;</ix:nonNumeric>&#160;Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" format="ixt-sec:boolballotbox" name="dei:PreCommencementTenderOffer" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzE2_8ead0c9c-f146-45e1-b15e-5d213968e1e9">&#9744;</ix:nonNumeric>&#160;Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%"><ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" format="ixt-sec:boolballotbox" name="dei:PreCommencementIssuerTenderOffer" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzE5_30e8bccc-b9cc-454a-8a61-14fc670872e1">&#9744;</ix:nonNumeric>&#160;Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</span></div><div style="margin-top:12pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:</span></div><div><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:37.094%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:22.511%"></td><td style="width:0.1%"></td><td 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solid #000;border-left:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" name="dei:Security12bTitle" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGFibGU6YTczMjIxM2UzZjEzNDFhOGI3NzYzMTExZWEzYjg2ZTkvdGFibGVyYW5nZTphNzMyMjEzZTNmMTM0MWE4Yjc3NjMxMTFlYTNiODZlOV8xLTAtMS0xLTA_a363492e-6357-445c-bd23-8701e4ceaa5e">Common Shares, par value $5.00 per share</ix:nonNumeric></span></td><td colspan="3" style="border-bottom:1pt solid #000;border-left:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" name="dei:TradingSymbol" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGFibGU6YTczMjIxM2UzZjEzNDFhOGI3NzYzMTExZWEzYjg2ZTkvdGFibGVyYW5nZTphNzMyMjEzZTNmMTM0MWE4Yjc3NjMxMTFlYTNiODZlOV8xLTEtMS0xLTA_f05bd0bf-2f8a-4f17-8eba-fe3f153a8f05">OTTR</ix:nonNumeric></span></td><td colspan="3" style="border-bottom:1pt solid #000;border-left:1pt solid #000;border-right:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%"><ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" format="ixt-sec:exchnameen" name="dei:SecurityExchangeName" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGFibGU6YTczMjIxM2UzZjEzNDFhOGI3NzYzMTExZWEzYjg2ZTkvdGFibGVyYW5nZTphNzMyMjEzZTNmMTM0MWE4Yjc3NjMxMTFlYTNiODZlOV8xLTItMS0xLTA_f7462d13-9481-4697-afc8-91881dfc955f">The Nasdaq Stock Market LLC</ix:nonNumeric></span></td></tr></table></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%">Emerging growth company   <ix:nonNumeric contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901" format="ixt-sec:boolballotbox" name="dei:EntityEmergingGrowthCompany" id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzAz_ae5510b8-87e5-4ff4-b556-84f09bbcf112">&#9744;</ix:nonNumeric></span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:8pt;font-weight:400;line-height:120%">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.&#160;  &#9744;</span></div><div style="height:54pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div><div id="ib3441a02aeea43a78a2010d36ab13e35_7"></div><hr style="page-break-after:always"/><div style="min-height:54pt;width:100%"><div><span><br/></span></div></div><div style="-sec-extract:summary;margin-bottom:9pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Item 8.01   Other Events</span></div><div style="margin-top:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Integrated Resource Plan</span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:112%">On September 1, 2021, Otter Tail Power Company (OTP), a wholly owned subsidiary of Otter Tail Corporation, filed its 2022 Integrated Resource Plan (2022 IRP) concurrently with regulators in the three states where OTP operates, the Minnesota Public Utilities Commission (MPUC), the North Dakota Public Service Commission (NDPSC), and the South Dakota Public Utility Commission (SDPUC). The 2022 IRP includes OTP&#8217;s preferred plan for meeting customers&#8217; anticipated capacity and energy needs while maintaining system reliability and low electric service rates.</span></div><div style="margin-bottom:3pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">The major requests in OTP's preferred plan include:</span></div><div style="margin-bottom:3pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">&#8211;</span><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:13.52pt">the addition of dual fuel capability at our Astoria Station natural gas plant;</span></div><div style="margin-bottom:3pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">&#8211;</span><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:13.52pt">the addition of 150 megawatts of solar generation in 2025; and</span></div><div style="margin-bottom:3pt;padding-left:36pt;text-indent:-18pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">&#8211;</span><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:13.52pt">the commencement of the process of withdrawal from our 35 percent ownership interest in Coyote Station, a jointly owned, coal-fired generation plant, by December 31, 2028.</span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">The preferred plan proposes to, subject to regulatory approval, create a regulatory asset to recover costs related to the future withdrawal from Coyote Station, including the net book value of the plant on the withdrawal date, anticipated decommissioning costs, and any costs incurred if a termination of the existing lignite sales agreement under which Coyote Station acquires all of its lignite coal fuel from a nearby mine is necessary. For its economic analysis, OTP developed an estimate of the reasonably foreseeable costs of withdrawing from Coyote Station at the end of 2028 of $68.5 million. These costs may differ from actual results due to the uncertainty and timing of future events associated with the terms and conditions of a withdrawal.</span></div><div style="margin-top:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Forward-looking Statements</span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Certain information discussed in this Current Report on Form 8-K is forward-looking information that involves risks, uncertainties and assumptions. Such forward-looking statements, including our expectations regarding the regulatory proceedings, as well as assumptions and other statements are intended to be identified in this document by the words &#8220;anticipate,&#8221; &#8220;believe,&#8221; &#8220;could,&#8221; &#8220;estimate,&#8221; &#8220;expect,&#8221; &#8220;intend,&#8221; &#8220;may,&#8221; &#8220;objective,&#8221; &#8220;outlook,&#8221; &#8220;plan,&#8221;  &#8220;possible,&#8221; &#8220;potential,&#8221; &#8220;preferred,&#8217; &#8220;project,&#8221; &#8220;propose,&#8221; &#8220;should,&#8221; &#8220;will,&#8221; &#8220;would&#8221; and similar expressions. Actual results may vary materially. Forward-looking statements speak only as of the date they are made, and we expressly disclaim any obligation to update any forward-looking information. The following factors, in addition to those discussed in Otter Tail Corporation's Annual Report on Form 10-K for the year ended Dec. 31, 2020, and subsequent filings with the Securities and Exchange Commission, could cause actual results to differ materially from management expectations as suggested by such forward-looking information: uncertainty around the impacts and duration of the COVID-19 pandemic; operational safety; successful long-term operational planning; the negotiated terms of a withdrawal from Coyote Station; commodity risks associated with energy markets and production; rising energy prices and fuel costs; qualified employee work force and third-party contractor factors; ability to recover costs; changes in regulation; reductions in our credit ratings and the cost of maintaining certain contractual relationships; general economic conditions, including inflation rates, monetary fluctuations and their impact on capital expenditures and the ability of Otter Tail Corporation and its subsidiaries to obtain financing on favorable terms; availability or cost of capital; our customers&#8217; and counterparties&#8217; ability to pay their debts to us; assumptions and costs relating to funding our employee benefit plans and health care benefits; tax laws; effects of geopolitical events, including war and acts of terrorism; cyber security threats and data security breaches; seasonal weather patterns; changes in environmental laws and regulations; climate change and other weather; natural disaster and resource depletion, including compliance with any accompanying legislative and regulatory changes; and costs of potential regulatory penalties.</span></div><div style="margin-bottom:9pt;margin-top:9pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Item 9.01&#160;&#160;&#160;&#160;Financial Statements and Exhibits</span></div><div style="margin-top:6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:2.650%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:4.455%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:89.595%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div style="text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(d)</span></div></td><td colspan="6" style="padding:2px 1pt;text-align:left;vertical-align:middle"><div><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Exhibits</span></div></td></tr><tr style="height:3pt"><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td></tr><tr><td colspan="3" style="background-color:#dbdbdb;padding:0 1pt"></td><td colspan="3" style="background-color:#dbdbdb;padding:2px 1pt;text-align:left;vertical-align:middle"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">99.1</span></td><td colspan="3" style="background-color:#dbdbdb;padding:2px 1pt;text-align:left;vertical-align:middle"><div><span style="color:#0000ff;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:107%;text-decoration:underline"><a style="-sec-extract:exhibit;color:#0000ff;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:107%;text-decoration:underline" href="exhibit991-otpirppressrele.htm">Press Release</a></span><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:107%"> issued September 1, 2021</span></div></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:middle"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">104</span></td><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:middle"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:107%">Cover Page Interactive Data File (embedded within the Inline XBRL document).</span></td></tr><tr style="height:3pt"><td colspan="3" style="border-bottom:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="border-bottom:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="border-bottom:1pt solid #000;padding:0 1pt"></td></tr></table></div><div style="height:54pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div><div id="ib3441a02aeea43a78a2010d36ab13e35_10"></div><hr style="page-break-after:always"/><div style="min-height:54pt;width:100%"><div><span><br/></span></div></div><div style="margin-top:18pt;text-align:center"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:700;line-height:120%">SIGNATURE</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</span></div><div style="margin-top:6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:95.000%"><tr><td style="width:1.0%"></td><td style="width:49.630%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:3.285%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:43.785%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">OTTER TAIL CORPORATION</span></td></tr><tr style="height:14pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:0 1pt"></td></tr><tr style="height:14pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Date: September 2, 2021</span></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span 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Moug</span></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Kevin G. Moug</span></td></tr><tr><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:100%">Chief Financial Officer</span></td></tr></table></div><div style="height:54pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div style="text-align:center"><span><br/></span></div></div></div></body></html>
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<title>Document</title></head><body><div id="i495414986a954fdcbdbb4fe953f43d63_41"></div><div style="min-height:47.27pt;width:100%"><div style="text-align:right"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Exhibit 99.1</font></div></div><div style="margin-bottom:0.05pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:35.919%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:22.297%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:38.484%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:0 1pt"><div><img alt="image.jpg" src="image.jpg" style="height:106px;margin-bottom:5pt;vertical-align:text-bottom;width:211px"></div></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="text-align:right"><font style="color:#1f497d;font-family:'Arial',sans-serif;font-size:22pt;font-weight:400;line-height:112%">News release</font></div><div style="text-align:right"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:11pt;font-weight:700;line-height:112%">Contact&#58; Stephanie Hoff</font></div><div style="text-align:right"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:11pt;font-weight:400;line-height:112%">shoff&#64;otpco.com</font></div><div style="text-align:right"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:11pt;font-weight:400;line-height:112%">218-739-8535 (office)</font></div><div style="text-align:right"><font style="color:#000000;font-family:'Arial',sans-serif;font-size:11pt;font-weight:400;line-height:112%">218-205-6179 (after hours)</font><font style="color:#000000;font-family:'Arial',sans-serif;font-size:12pt;font-weight:400;line-height:112%">     </font></div></td></tr></table></div><div><font><br></font></div><div style="margin-bottom:9pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:14pt;font-weight:700;line-height:120%">Cost and&#160;reliability drive Otter Tail Power&#160;Company&#8217;s&#160;15-year&#160;resource&#160;plan</font><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:14pt;font-weight:400;line-height:120%">&#160;</font></div><div style="margin-bottom:6pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-style:italic;font-weight:700;line-height:133%">Fergus Falls, Minnesota, September 1, 2021&#58;</font><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">&#160;&#160;</font><font style="background-color:#ffffff;color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">Today&#8239;Otter Tail Power Company&#8239;submitted&#160;its&#160;Integrated Resource Plan (IRP)&#160;to regulatory commissions in each of the three states it serves&#58;&#160;Minnesota, North Dakota, and South Dakota.&#160;</font><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">&#160;</font></div><div style="margin-bottom:6pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">The company spent two years&#160;analyzing&#160;robust&#160;market&#160;data&#160;and&#160;engaging&#160;with people and organizations&#160;across its service area, including&#160;updates with&#160;its regulatory commissions,&#160;who helped inform the&#160;analysis.&#160;&#8220;Planning a diverse mix of energy resources to reliably and economically&#160;serve our&#160;customers&#160;over the next 15 years is extremely complex,&#8221; said Otter Tail Power Company President Tim Rogelstad. &#8220;I am proud of our&#160;collaborative&#160;team for submitting a plan&#160;that&#160;enhances&#160;our ability&#160;to ensure our customers have the electricity they need, when they need it, at&#160;an&#160;affordable&#160;price, in an environmentally responsible way.&#8221;&#160;</font></div><div style="margin-bottom:6pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">In its preferred plan,&#160;Otter Tail Power&#160;Company&#160;is&#160;requesting authority&#160;to&#160;add dual fuel capability at the company&#8217;s Astoria Station, which is in South Dakota and is fueled&#160;in part&#160;by natural gas from North Dakota&#8217;s Williston Basin, add&#160;150 megawatts of solar at a location yet to be determined, and&#160;commence the process of withdrawal from its 35% ownership interest in coal-fired Coyote Station in North Dakota&#160;in 2028.&#160;&#160;</font></div><div style="margin-bottom:6pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">Energy market conditions&#160;have been evolving over the past several years&#160;and are forecast to continue offering&#160;low-cost energy&#160;opportunities to utilities whose electric generation&#160;can quickly react to real-time market conditions,&#160;such as natural gas-fired resources.&#160;</font></div><div style="margin-bottom:6pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">&#8220;As we&#160;maintain and enhance resiliency, it&#8217;s&#160;our&#160;accountability to customers&#160;to&#160;pursue economical generation resources&#160;that give us&#160;greater control over whether or not to dispatch resources based on market conditions,&#8221; said Rogelstad.&#160;&#8220;Coyote&#160;Station has been a safe, reliable, cost-effective resource for our customers for 40 years.&#160;For that, we are grateful.&#160;Because more&#160;flexible and economical&#160;resource&#160;options are available&#160;as we look forward,&#160;Otter Tail Power Company is seeking to withdraw from our&#160;35%&#160;ownership interest in&#160;the facility.&#160;It is important to understand this is not a decision to&#160;retire&#160;Coyote Station, which is a co-owned&#160;facility.&#160;&#160;Coyote Station&#8217;s future&#160;is not ours&#160;alone&#160;to&#160;determine.&#8221;&#160;</font></div><div style="margin-bottom:6pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">According to Rogelstad,&#160;Coyote&#160;Station owners&#160;continue to collaborate&#160;in analyzing data and&#160;weighing&#160;decisions that will&#8239;impact the plant and each company&#8217;s employees,&#8239;customers, and communities.&#160;&#8220;We are taking&#160;the time to get these important decisions right given the many stakeholders involved,&#8221; said Rogelstad.&#160;&#8220;It&#8217;s likely to be a couple of years before we know&#160;the path of&#160;any&#160;withdrawal from plant&#160;ownership and operation.&#160;While each of the&#8239;owners is uniquely positioned to serve&#160;its&#160;customers&#8212;in terms of the amount of energy&#160;its&#160;customers need and the required production capacity of&#160;its&#160;generation resources&#8212;our shared priorities&#8239;are&#8239;to&#8239;continue serving customers with&#8239;reliable, low-cost electricity.&#8221;&#160;Otter Tail Power&#160;Company&#160;will continue&#160;to operate the plant.&#160;&#160;</font></div><div style="margin-bottom:6pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">Resource planning is an ever-evolving process.&#160;According to Rogelstad,&#160;Otter Tail Power&#160;Company&#160;will continue to monitor&#160;issues that could impact its plan,&#160;including&#160;changes to&#160;the Midcontinent Independent System Operator&#8217;s&#160;capacity construct,&#160;evolving&#160;energy markets, and&#160;current or future&#160;federal&#160;or&#160;state energy&#160;laws or regulations&#160;including&#160;the&#160;federal&#160;Regional Haze Rule.&#160;&#160;</font></div><div style="margin-bottom:6pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">By 2023&#160;Otter Tail Power&#160;Company&#160;customers will receive approximately 35% of their energy from renewable resources.&#160;Assuming&#160;the current dispatch levels of&#160;co-owned&#160;units Coyote Station and Big Stone Plant&#160;remain&#160;as they&#160;are&#160;today, the company&#8217;s target is to reduce carbon emissions from generation resources it owns approximately 50%&#160;from&#160;2005 levels by 2025 and 97%&#160;by 2050.&#160;&#8220;As we transition to a cleaner energy future, we&#8217;re keeping residential rates among the lowest in the nation,&#8221; said Rogelstad. &#8220;This&#160;is&#160;part of our mission&#160;and&#160;our&#160;ongoing commitment to&#160;our customers.&#8221;&#160;</font></div><div style="margin-top:9pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:133%">About Otter Tail Power Company</font><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">&#160;</font></div><div style="margin-bottom:6pt"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:133%">Otter Tail Power Company, a subsidiary of Otter Tail Corporation (Nasdaq Global Select Market&#58; OTTR), is headquartered in Fergus Falls, Minnesota. With a balanced commitment to environmental, economic, and community stewardship, the company provides electricity and energy services to approximately 230,000 people in Minnesota, North Dakota, and South Dakota. To learn more about Otter Tail Power Company visit&#160;otpco.com.&#160;To learn more about Otter Tail Corporation visit&#160;ottertail.com.</font></div><div><font><br></font></div><div style="height:50.28pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div></div></div></body></html>
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    <link:label id="lab_dei_WrittenCommunications_label_en-US" xlink:label="lab_dei_WrittenCommunications" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Written Communications</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_WrittenCommunications" xlink:to="lab_dei_WrittenCommunications" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_AmendmentFlag_40e710ca-42a6-4aa2-a60d-2027cfec04ee_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Amendment Flag</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentFlag" xlink:to="lab_dei_AmendmentFlag" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CityAreaCode_96f67526-7ab8-4299-bd12-24a6f8425747_terseLabel_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">City Area Code</link:label>
    <link:label id="lab_dei_CityAreaCode_label_en-US" xlink:label="lab_dei_CityAreaCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">City Area Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CityAreaCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CityAreaCode" xlink:to="lab_dei_CityAreaCode" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_Security12bTitle_82dcad26-2f7c-4378-a0f9-e1753d4944f7_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:label id="lab_dei_Security12bTitle_label_en-US" xlink:label="lab_dei_Security12bTitle" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Title of 12(b) Security</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_Security12bTitle"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_Security12bTitle" xlink:to="lab_dei_Security12bTitle" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressStateOrProvince_b3efc4c5-9d73-4368-a382-bf51a25918b5_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, State or Province</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressStateOrProvince"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressStateOrProvince" xlink:to="lab_dei_EntityAddressStateOrProvince" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_SecurityExchangeName_50ffb6e0-2947-49e4-a62f-55ebd1199d48_terseLabel_en-US" xlink:label="lab_dei_SecurityExchangeName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Security Exchange Name</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SecurityExchangeName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SecurityExchangeName" xlink:to="lab_dei_SecurityExchangeName" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_SolicitingMaterial_d1d6db23-e2a3-4721-b3c2-d649638d988f_terseLabel_en-US" xlink:label="lab_dei_SolicitingMaterial" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Soliciting Material</link:label>
    <link:label id="lab_dei_SolicitingMaterial_label_en-US" xlink:label="lab_dei_SolicitingMaterial" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Soliciting Material</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SolicitingMaterial"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SolicitingMaterial" xlink:to="lab_dei_SolicitingMaterial" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_DocumentPeriodEndDate_fc7892ff-124f-4907-a0f1-65b1e9dea429_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Period End Date</link:label>
    <link:label id="lab_dei_DocumentPeriodEndDate_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Document Period End Date</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate" xlink:to="lab_dei_DocumentPeriodEndDate" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressCityOrTown_af574e85-79fa-41d1-8f2b-3bb4f09e284d_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:label id="lab_dei_EntityAddressCityOrTown_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, City or Town</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown" xlink:to="lab_dei_EntityAddressCityOrTown" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityTaxIdentificationNumber_a96ec4f1-30a3-4cf0-abc4-0fd6fe4209c3_terseLabel_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:label id="lab_dei_EntityTaxIdentificationNumber_label_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Tax Identification Number</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityTaxIdentificationNumber" xlink:to="lab_dei_EntityTaxIdentificationNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_CoverAbstract_label_en-US" xlink:label="lab_dei_CoverAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Cover [Abstract]</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CoverAbstract" xlink:to="lab_dei_CoverAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_PreCommencementIssuerTenderOffer_0158a3bb-6467-4066-8c90-672c90020829_terseLabel_en-US" xlink:label="lab_dei_PreCommencementIssuerTenderOffer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
    <link:label id="lab_dei_PreCommencementIssuerTenderOffer_label_en-US" xlink:label="lab_dei_PreCommencementIssuerTenderOffer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_PreCommencementIssuerTenderOffer" xlink:to="lab_dei_PreCommencementIssuerTenderOffer" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_PreCommencementTenderOffer_868e77b0-1d5b-4d7c-9444-684ff5d44ce8_terseLabel_en-US" xlink:label="lab_dei_PreCommencementTenderOffer" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
    <link:label id="lab_dei_PreCommencementTenderOffer_label_en-US" xlink:label="lab_dei_PreCommencementTenderOffer" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementTenderOffer"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_PreCommencementTenderOffer" xlink:to="lab_dei_PreCommencementTenderOffer" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityIncorporationStateCountryCode_22224d16-2cec-432b-9343-3fa78332a25c_terseLabel_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
    <link:label id="lab_dei_EntityIncorporationStateCountryCode_label_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityIncorporationStateCountryCode" xlink:to="lab_dei_EntityIncorporationStateCountryCode" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityAddressAddressLine1_a288f021-144c-4752-84ba-2b34d7ffc61d_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Address, Address Line One</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressAddressLine1" xlink:to="lab_dei_EntityAddressAddressLine1" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityEmergingGrowthCompany_76227ade-172b-4bc4-a396-8e8329d9a389_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Emerging Growth Company</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany" xlink:to="lab_dei_EntityEmergingGrowthCompany" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityRegistrantName_bb55583f-8302-4e67-838a-516499da3b89_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:label id="lab_dei_EntityRegistrantName_label_en-US" xlink:label="lab_dei_EntityRegistrantName" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName" xlink:to="lab_dei_EntityRegistrantName" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityFileNumber_389e1999-515e-4f61-96c6-d0a6f8481078_terseLabel_en-US" xlink:label="lab_dei_EntityFileNumber" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity File Number</link:label>
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    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFileNumber"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFileNumber" xlink:to="lab_dei_EntityFileNumber" xlink:type="arc" order="1"/>
    <link:label id="lab_dei_EntityCentralIndexKey_28761c3f-0537-402f-aac5-670e99bceb16_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Entity Central Index Key</link:label>
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    <link:label id="lab_dei_TradingSymbol_872a2f66-3b91-43cb-a079-2d2bc7453aba_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Trading Symbol</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol" xlink:to="lab_dei_TradingSymbol" xlink:type="arc" order="1"/>
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<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>5
<FILENAME>ottr-20210901_pre.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
<TEXT>
<XBRL>
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<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
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      id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzE4_5da9c2db-b4fa-417b-ad60-e8c8c5e1141a">410-8780</dei:LocalPhoneNumber>
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      contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901"
      id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzE0_f1752e5e-8043-4033-a5bc-7de0d0b73182">false</dei:WrittenCommunications>
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      id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzE1_23892123-f4f1-4394-8790-ebf1a3afa604">false</dei:SolicitingMaterial>
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      contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901"
      id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzE2_8ead0c9c-f146-45e1-b15e-5d213968e1e9">false</dei:PreCommencementTenderOffer>
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      contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901"
      id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzE5_30e8bccc-b9cc-454a-8a61-14fc670872e1">false</dei:PreCommencementIssuerTenderOffer>
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      contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901"
      id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGFibGU6YTczMjIxM2UzZjEzNDFhOGI3NzYzMTExZWEzYjg2ZTkvdGFibGVyYW5nZTphNzMyMjEzZTNmMTM0MWE4Yjc3NjMxMTFlYTNiODZlOV8xLTAtMS0xLTA_a363492e-6357-445c-bd23-8701e4ceaa5e">Common Shares, par value $5.00 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="ie51384a378af4763b723427ed2e8b4fe_D20210901-20210901"
      id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGFibGU6YTczMjIxM2UzZjEzNDFhOGI3NzYzMTExZWEzYjg2ZTkvdGFibGVyYW5nZTphNzMyMjEzZTNmMTM0MWE4Yjc3NjMxMTFlYTNiODZlOV8xLTEtMS0xLTA_f05bd0bf-2f8a-4f17-8eba-fe3f153a8f05">OTTR</dei:TradingSymbol>
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      id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGFibGU6YTczMjIxM2UzZjEzNDFhOGI3NzYzMTExZWEzYjg2ZTkvdGFibGVyYW5nZTphNzMyMjEzZTNmMTM0MWE4Yjc3NjMxMTFlYTNiODZlOV8xLTItMS0xLTA_f7462d13-9481-4697-afc8-91881dfc955f">NASDAQ</dei:SecurityExchangeName>
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      id="id3VybDovL2RvY3MudjEvZG9jOmIzNDQxYTAyYWVlYTQzYTc4YTIwMTBkMzZhYjEzZTM1L3NlYzpiMzQ0MWEwMmFlZWE0M2E3OGEyMDEwZDM2YWIxM2UzNV8xL2ZyYWc6YWQwMjA2OGMxYjllNGIwZDkzYTYxMzUyZmE2YTZjMDYvdGV4dHJlZ2lvbjphZDAyMDY4YzFiOWU0YjBkOTNhNjEzNTJmYTZhNmMwNl8xNzAz_ae5510b8-87e5-4ff4-b556-84f09bbcf112">false</dei:EntityEmergingGrowthCompany>
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</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>8
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
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</head>
<body>
<span style="display: none;">v3.21.2</span><table class="report" border="0" cellspacing="2" id="idm139934185358824">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Cover<br></strong></div></th>
<th class="th"><div>Sep. 01, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">8-K<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Sep.  01,  2021<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">OTTER TAIL CORPORATION<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity Tax Identification Number</a></td>
<td class="text">27-0383995<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity Address, Address Line One</a></td>
<td class="text">215 South Cascade Street,&#160;P.O. Box 496<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">Fergus Falls<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">MN<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">56538-0496<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">866<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">410-8780<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common Shares, par value $5.00 per share<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">OTTR<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NASDAQ<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001466593<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_WrittenCommunications', window );">Written Communications</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SolicitingMaterial', window );">Soliciting Material</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementTenderOffer', window );">Pre-commencement Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementIssuerTenderOffer', window );">Pre-commencement Issuer Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityFileNumber', window );">Entity File Number</a></td>
<td class="text">0-53713<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">MN<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_AmendmentFlag</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CityAreaCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CoverAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Cover page.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CoverAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is YYYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementIssuerTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 13e<br> -Subsection 4c<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementIssuerTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14d<br> -Subsection 2b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SolicitingMaterial">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Section 14a<br> -Number 240<br> -Subsection 12<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SolicitingMaterial</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<td><strong> Data Type:</strong></td>
<td>dei:tradingSymbolItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_WrittenCommunications">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br> -Section 425<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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<td><strong> Data Type:</strong></td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
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<FILENAME>0001466593-21-000061-xbrl.zip
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
