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Inventories and natural gas in storage | 9 Months Ended
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Sep. 30, 2025
Inventory Disclosure [Abstract] |
Inventories and natural gas in storage | Inventories and natural gas in storage Natural gas in storage is generally valued at lower of cost or market using the last-in, first-out method or lower of cost or net realizable value using the average cost or first-in, first-out method. The majority of all other inventories are valued at the lower of cost or net realizable value using the average cost method. The portion of the cost of natural gas in storage expected to be used within 12 months was included in inventories. Inventories on the Consolidated Balance Sheets were as follows:
| September 30, 2025 | September 30, 2024 | December 31, 2024
| (In thousands)
Natural gas in storage (current) | $ | 40,077 |  | $ | 40,770 |  | $ | 40,073 |
Fuel stock | 4,195 |  | 4,196 |  | 4,867 |
Total | $ | 44,272 |  | $ | 44,966 |  | $ | 44,940 |
The remainder of natural gas in storage, which largely represents the cost of gas required to maintain pressure levels for normal operating purposes, was included in noncurrent assets - other and was $48.5 million, $50.1 million and $48.5 million at September 30, 2025 and 2024 and December 31, 2024, respectively.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/330/tableOfContent + Details
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