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Jointly Owned Electric Facilities (Tables)
12 Months Ended
Dec. 31, 2022
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):

 

 

2022

 

 

2021

 

Utility plant in service

 

$

390,852

 

 

$

395,028

 

Accumulated depreciation

 

 

(315,223

)

 

 

(302,220

)