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Borrowings and Other Financing Instruments, Credit Facility (Details) - Credit Facility - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Credit Facility [1] $ 150,000,000  
Outstanding [2] 76,000,000  
Available 74,000,000  
Direct advances on the credit facility outstanding $ 0 $ 0
[1]
This credit facility expires in June 2024.
[2]
Includes outstanding commercial paper.