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Utility Plant | 9 Months Ended
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Sep. 30, 2025
Property, Plant and Equipment [Abstract] |
Utility Plant | Utility Plant Utility plant as of September 30, 2025 and December 31, 2024 consist of the following (in thousands):
| September 30, 2025 | December 31, 2024
Transmission and distribution plant | $ | 356,546 |  | $ | 321,075 |
Equipment | 78,764 |  | 67,917 |
Office buildings and other structures | 72,564 |  | 67,313 |
Construction work-in-progress | 81,116 |  | 54,388 |
Land | 2,897 |  | 2,300 |
Total utility plant | $ | 591,887 |  | $ | 512,993 |
Depreciation expense related to depreciable property was $3.5 million and $2.9 million for the three months ended September 30, 2025 and 2024, respectively. Depreciation expense related to depreciable property was $10.0 million and $8.6 million for the nine months ended September 30, 2025 and 2024, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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