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Shareholders' Equity (Details) - USD ($)
$ in Thousands
 6 Months Ended
May 03, 2024
Jun. 30, 2025
Dec. 31, 2024
Class of Stock [Line Items]      
Total capitalization   $ 2,817,836 $ 2,612,233
Otter Tail Power Company      
Class of Stock [Line Items]      
Equity to total capitalization ratio   54.90%  
Net assets restricted from distribution   $ 861,000  
Minimum | Otter Tail Power Company | Minnesota Public Utilities Commission      
Class of Stock [Line Items]      
Public utilities, requested equity capital structure (as a percent)   47.20%  
Maximum | Otter Tail Power Company      
Class of Stock [Line Items]      
Total capitalization   $ 2,200,000  
Maximum | Otter Tail Power Company | Minnesota Public Utilities Commission      
Class of Stock [Line Items]      
Public utilities, requested equity capital structure (as a percent)   57.70%  
Second Shelf Registration      
Class of Stock [Line Items]      
Shelf registration (in shares) 1,500,000    
Number of shares issued (in shares)   50,512  
Number of shares available for grant (in shares)   1,379,019