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Financing: Debt Covenants (Details)
Dec. 31, 2022
Debt Instrument [Line Items]  
Consolidated Indebtedness to Capitalization Ratio 0.609
Maximum  
Debt Instrument [Line Items]  
Consolidated Indebtedness to Capitalization Ratio 0.65
Maximum | Wyoming Electric  
Debt Instrument [Line Items]  
Consolidated Indebtedness to Capitalization Ratio 0.60