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Schedule 1 - Condensed Financial Information of Registrant (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Related Party Transactions [Table Text Block]

As of December 31, 2019: (in thousands)		Accounts Receivable				Interest Receivable				Current Notes Receivable				Long-Term Notes Receivable				Accounts Payable				Current Notes Payable
Otter Tail Power Company		$	2,056			$	-			$	-			$	-			$	7			$	-
Northern Pipe Products, Inc.			-				8				-				5,351				-				3,056
Vinyltech Corporation			4				17				-				11,500				-				15,099
BTD Manufacturing, Inc.			-				77				-				52,000				-				18,474
T.O. Plastics, Inc.			-				15				-				10,400				-				3,099
Varistar Corporation			-				-				-				-				-				49,883
Otter Tail Assurance Limited			84				-				-				-				-				-
		$	2,144			$	117			$	-			$	79,251			$	7			$	89,611

As of December 31, 2018: (in thousands)		Accounts Receivable				Interest Receivable				Current Notes Receivable				Long-Term Notes Receivable				Accounts Payable				Current Notes Payable
Otter Tail Power Company		$	1,877			$	-			$	-			$	-			$	7			$	-
Northern Pipe Products, Inc.			-				8				-				5,522				-				5,623
Vinyltech Corporation			4				17				-				11,500				-				15,305
BTD Manufacturing, Inc.			-				77				415				52,000				-				-
T.O. Plastics, Inc.			-				15				-				10,400				-				14,308
Varistar Corporation			-				-				752				-				-				25,390
Otter Tail Assurance Limited			50				-				-				-				-				-
		$	1,931			$	117			$	1,167			$	79,422			$	7			$	60,626

Cash Dividends Paid to Parent by Subsidiaries [Table Text Block]

(in thousands)		2019				2018				2017
Cash Dividends Paid to Parent by Subsidiaries		$	55,660			$	53,134			$	50,571

Parent Company [Member]

Notes Tables

Condensed Balance Sheet [Table Text Block]

SCHEDULE 1 - Condensed financial information of registrant
Otter Tail Corporation (PARENT COMPANY)
Condensed Balance Sheets, December 31
(in thousands)		2019				2018

Assets
Current Assets
Cash and Cash Equivalents		$	4,959			$	-
Accounts Receivable			-				-
Accounts Receivable from Subsidiaries			2,144				1,931
Interest Receivable from Subsidiaries			117				117
Notes Receivable from Subsidiaries			-				1,167
Income Taxes Receivable			1,487				-
Other			1,050				3,482
Total Current Assets			9,757				6,697
Investments in Subsidiaries			860,646				787,869
Notes Receivable from Subsidiaries			79,251				79,422
Deferred Income Taxes			25,505				21,100
Right of Use Assets - Operating			637				-
Other Assets			35,503				31,547
Total Assets		$	1,011,299			$	926,635

Liabilities and Equity

Current Liabilities
Short-Term Debt		$	6,000			$	9,215
Current Maturities of Long-Term Debt			183				172
Accounts Payable to Subsidiaries			7				7
Notes Payable to Subsidiaries			89,611				60,626
Current Operating Lease Liabilities			156				-
Other			9,473				9,994
Total Current Liabilities			105,430				80,014

Long Term Operating Lease Liabilities			533				-
Other Noncurrent Liabilities			44,042				37,814
Commitments and Contingencies
Capitalization
Long-Term Debt, Net of Current Maturities			79,812				79,944
Common Shareholder Equity			781,482				728,863
Total Capitalization			861,294				808,807
Total Liabilities and Equity		$	1,011,299			$	926,635

Condensed Income Statement [Table Text Block]

Otter Tail Corporation (PARENT COMPANY)
Condensed Statements of Income--For the Years Ended December 31
(in thousands)		2019				2018				2017

Operating Loss
Revenue from Contracts with Customers		$	-			$	-			$	-
Operating Expenses			10,529				9,916				7,138
Operating Loss			(10,529	)			(9,916	)			(7,138	)

Other Income (Expense)
Equity Income in Earnings of Subsidiaries			93,731				91,446				82,715
Interest Charges			(4,863	)			(4,043	)			(4,270	)
Interest Charges to Subsidiaries			(306	)			(387	)			(244	)
Interest Income from Subsidiaries			3,063				2,839				2,848
Nonservice Cost Components of Postretirement Benefits			(1,297	)			(1,422	)			(1,215	)
Other Income			1,566				550				1,054
Total Other Income			91,894				88,983				80,888

Income Before Income Taxes			81,365				79,067				73,750
Income Tax (Benefit) Expense			(5,482	)			(3,278	)			1,311
Net Income		$	86,847			$	82,345			$	72,439

Condensed Cash Flow Statement [Table Text Block]

Otter Tail Corporation (PARENT COMPANY)
Condensed Statements of Cash Flows--For the Years Ended December 31
(in thousands)		2019				2018				2017
Cash Flows from Operating Activities
Net Cash Provided by Operating Activities		$	52,263			$	56,947			$	50,205

Cash Flows from Investing Activities
Investment in Subsidiaries			(34,990	)			(24,764	)			-
Debt Repaid by Subsidiaries			1,338				774				151
Cash Used in Investing Activities			(257	)			(623	)			(121	)
Net Cash (Used in) Provided by Investing Activities			(33,909	)			(24,613	)			30

Cash Flows from Financing Activities
Change in Checks Written in Excess of Cash			(31	)			31				-
Net Short-Term (Repayments) Borrowings			(3,215	)			9,215				-
Borrowings from (Repayments to) Subsidiaries			28,985				(1,281	)			23,389
Proceeds from Issuance of Common Stock			20,338				-				4,349
Common Stock Issuance Expenses			(577	)			(108	)			-
Payments for Retirement of Capital Stock			(2,730	)			(3,011	)			(1,799	)
Short-Term and Long-Term Debt Issuance Expenses			(270	)			(164	)			(158	)
Payments for Retirement of Long-Term Debt			(172	)			(189	)			(15,231	)
Dividends Paid			(55,723	)			(53,198	)			(50,632	)
Net Cash Used in Financing Activities			(13,395	)			(48,705	)			(40,082	)
Net Change in Cash and Cash Equivalents			4,959				(16,371	)			10,153
Cash and Cash Equivalents at Beginning of Period			-				16,371				6,218
Cash and Cash Equivalents at End of Period		$	4,959			$	-			$	16,371