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Borrowings and Other Financing Instruments, Credit Facility (Details) - Credit Facility - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]    
Credit Facility [1] $ 150,000,000  
Outstanding [2] 12,000,000  
Available 138,000,000  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] Expires in September 2027.
[2] Includes outstanding commercial paper.