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Jointly Owned Electric Facilities (Tables)
12 Months Ended
Dec. 31, 2023
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):

 

 

2023

 

 

2022

 

Utility plant in service

 

$

394,398

 

 

$

390,852

 

Accumulated depreciation

 

 

(334,338

)

 

 

(315,223

)