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Business Description And Significant Accounting Policies: Materials, Supplies and Fuel (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
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