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STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Operating revenues        
Municipalities and cooperatives $ 2,287 $ 2,204 $ 7,190 $ 6,367
Industries directly served 310 324 1,077 1,019
Federal agencies and other 31 31 95 83
Other revenue 29 28 91 89
Total operating revenues 2,657 2,587 8,453 7,558
Operating expenses        
Fuel 584 509 2,071 1,343
Purchased power 387 277 1,026 656
Operating and maintenance 994 757 2,677 2,267
Depreciation and amortization 436 416 1,296 1,240
Tax equivalents 174 114 464 320
Total operating expenses 2,575 2,073 7,534 5,826
Operating income 82 514 919 1,732
Other income (expense), net 4 6 25 20
Interest expense        
Interest expense 358 343 1,072 1,026
Allowance for funds used during construction and nuclear fuel expenditures (32) (22) (93) (53)
Net interest expense 326 321 979 973
Net income (loss) $ (240) $ 199 $ (35) $ 779