Inventories and natural gas in storage (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
Jun. 30, 2025 |
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| Inventory Disclosure [Abstract] | |||
| Natural gas in storage (current) | $ 14,413 | $ 34,333 | $ 14,937 |
| Fuel stock | 4,917 | 4,719 | 4,776 |
| Total | 19,330 | 39,052 | 19,713 |
| Natural gas in storage noncurrent | $ 47,800 | $ 47,800 | $ 48,500 |
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- Definition Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of fossil fuel included in inventory classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- Definition Carrying amount as of the balance sheet date of natural gas stored underground in depleted gas reservoirs, aquifers, or salt caverns to meet future seasonal and peak load demands and also as insurance against unforeseen supply disruptions, and deemed to be a noncurrent asset because it is not expected to be used within 12 months or in the normal operating cycle. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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