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Borrowings and Other Financing Instruments, Credit Facility (Details) - Credit Facility
Jun. 30, 2015
USD ($)
Line of Credit Facility [Line Items]  
Credit Facility [1] $ 150,000,000
Drawn [2] 0
Available 150,000,000
Direct advances on the credit facility outstanding $ 0
[1] This credit facility expires in October 2019.
[2] Includes outstanding commercial paper.