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Business Description And Significant Accounting Policies: Materials, Supplies and Fuel (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Inventory, Net [Abstract] |  |
Materials and supplies | $ 99,734 | $ 86,400
Fuel | 3,115 | 1,267
Natural gas in storage | 104,572 | 63,312
Total materials, supplies and fuel | $ 207,421 | $ 150,979

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