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Schedule I - Condensed Financial Information of Registrant - Related Party Transactions (Details) - Otter Tail Corporation - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Accounts Receivable from Subsidiaries	$ 3,278	$ 2,817
Interest Receivable from Subsidiaries	117	117
Current Notes Receivable	0	6,767
Notes Receivable from Subsidiaries	78,900	78,900
Accounts Payable	7	181
Notes Payable to Subsidiaries	420,363	190,204
Otter Tail Power Company
Related Party Transaction [Line Items]
Accounts Receivable from Subsidiaries	3,016	2,503
Interest Receivable from Subsidiaries	0	0
Current Notes Receivable	0	0
Notes Receivable from Subsidiaries	0	0
Accounts Payable	7	7
Notes Payable to Subsidiaries	0	0
Northern Pipe Products, Inc.
Related Party Transaction [Line Items]
Accounts Receivable from Subsidiaries	0	0
Interest Receivable from Subsidiaries	7	7
Current Notes Receivable	0	0
Notes Receivable from Subsidiaries	5,000	5,000
Accounts Payable	0	4
Notes Payable to Subsidiaries	77,182	32,057
Vinyltech Corporation
Related Party Transaction [Line Items]
Accounts Receivable from Subsidiaries	0	13
Interest Receivable from Subsidiaries	18	18
Current Notes Receivable	0	0
Notes Receivable from Subsidiaries	11,500	11,500
Accounts Payable	0	0
Notes Payable to Subsidiaries	90,425	34,881
BTD Manufacturing, Inc.
Related Party Transaction [Line Items]
Accounts Receivable from Subsidiaries	0	0
Interest Receivable from Subsidiaries	77	77
Current Notes Receivable	0	6,767
Notes Receivable from Subsidiaries	52,000	52,000
Accounts Payable	0	170
Notes Payable to Subsidiaries	693	0
T.O. Plastics, Inc.
Related Party Transaction [Line Items]
Accounts Receivable from Subsidiaries	20	20
Interest Receivable from Subsidiaries	15	15
Current Notes Receivable	0	0
Notes Receivable from Subsidiaries	10,400	10,400
Accounts Payable	0	0
Notes Payable to Subsidiaries	5,855	5,995
Varistar Corporation
Related Party Transaction [Line Items]
Accounts Receivable from Subsidiaries	0	0
Interest Receivable from Subsidiaries	0	0
Current Notes Receivable	0	0
Notes Receivable from Subsidiaries	0	0
Accounts Payable	0	0
Notes Payable to Subsidiaries	246,208	117,271
Otter Tail Assurance Limited
Related Party Transaction [Line Items]
Accounts Receivable from Subsidiaries	242	281
Interest Receivable from Subsidiaries	0	0
Current Notes Receivable	0	0
Notes Receivable from Subsidiaries	0	0
Accounts Payable	0	0
Notes Payable to Subsidiaries	$ 0	$ 0

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