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Utility Plant
 3 Months Ended
Mar. 31, 2025
Property, Plant and Equipment [Abstract]  
Utility Plant Utility Plant
Utility plant as of March 31, 2025 and December 31, 2024 consist of the following (in thousands):
March 31, 2025December 31, 2024
Transmission and distribution plant$326,067 $321,075 
Equipment70,081 67,917 
Office buildings and other structures68,339 67,313 
Construction work-in-progress68,557 54,388 
Land2,311 2,300 
Total utility plant$535,355 $512,993 
Depreciation expense related to depreciable property was $3.2 million and $2.9 million for the three months ended March 31, 2025 and 2024, respectively.