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Jointly Owned Electric Facilities (Tables)
12 Months Ended
Dec. 31, 2021
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]  
Schedule of Utility Plant in Service for Colstrip And Accumulated Depreciation The Company’s share of utility plant in service for Colstrip and accumulated depreciation (inclusive of the ARO assets and accumulated amortization) were as follows as of December 31 (dollars in thousands):

 

 

 

2021

 

 

2020

 

Utility plant in service

 

$

395,028

 

 

$

391,922

 

Accumulated depreciation

 

 

(302,220

)

 

 

(284,282

)