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Selected Balance Sheet Information: Materials, Supplies, and Fuel Schedule (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Selected Balance Sheet Information [Abstract] |  |
Materials and supplies | $ 104,945 | $ 99,734
Fuel - Electric Utilities | 7,674 | 3,115
Natural gas in storage | 55,460 | 104,572
Total materials, supplies and fuel | $ 168,079 | $ 207,421

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