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Selected Balance Sheet Information: Materials and Supplies (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Selected Balance Sheet Information [Abstract] |  |
Materials and supplies | $ 92,224 | $ 86,400
Fuel - Electric Utilities | 1,459 | 1,267
Natural gas in storage | 14,549 | 63,312
Total materials, supplies and fuel | $ 108,232 | $ 150,979

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