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Utility Plant
 6 Months Ended
Jun. 30, 2025
Property, Plant and Equipment [Abstract]  
Utility Plant Utility Plant
Utility plant as of June 30, 2025 and December 31, 2024 consist of the following (in thousands):
June 30, 2025December 31, 2024
Transmission and distribution plant$342,068 $321,075 
Equipment75,931 67,917 
Office buildings and other structures68,858 67,313 
Construction work-in-progress73,095 54,388 
Land2,315 2,300 
Total utility plant$562,267 $512,993 
Depreciation expense related to depreciable property was $3.2 million and $2.9 million for the three months ended June 30, 2025 and 2024, respectively. Depreciation expense related to depreciable property was $6.4 million and $5.8 million for the six months ended June 30, 2025 and 2024, respectively.