v3.25.4
Financing: Debt Covenants (Additional Information) (Details)
Dec. 31, 2025
Line of Credit Facility [Line Items]  
Consolidated indebtedness to capitalization ratio 0.55
Maximum  
Line of Credit Facility [Line Items]  
Consolidated indebtedness to capitalization ratio 0.65
Wyoming Electric  
Line of Credit Facility [Line Items]  
Consolidated indebtedness to capitalization ratio 0.5
Wyoming Electric | Maximum  
Line of Credit Facility [Line Items]  
Consolidated indebtedness to capitalization ratio 0.6