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Consolidated Condensed Statements of Operations (Unaudited) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Consolidated Condensed Statements of Operations    
Operating Revenues$ 2,209$ 2,130$ 5,341$ 5,074
Operating expenses:    
Fuel and purchased energy expense1,4011,1433,4703,016
Plant operating expense212199711630
Depreciation and amortization expense143152405423
Sales, general and other administrative expense334199113
Other operating expense22236475
Total operating expenses1,8111,5584,7494,257
Impairment losses 19 19
(Income) from unconsolidated investments in power plants(5)(1)(12)(14)
Income from operations403554604812
Interest expense192230575635
(Gain) loss on interest rate derivatives, net38414987
Interest (income)(2)(2)(7)(8)
Debt extinguishment costs(4)209427
Other (income) expense, net43149
Loss before income taxes and discontinued operations210219(221)62
Income tax expense (benefit)2021(45)38
Loss before discontinued operations190198(176)24
Discontinued operations, net of tax expense 19 31
Net income (loss)190217(176)55
Net income attributable to the noncontrolling interest  (1) 
Net income (loss) attributable to Calpine$ 190$ 217$ (177)$ 55
Basic earnings (loss) per common share:    
Weighted average shares of common stock outstanding, basic (in thousands)486,420486,088486,363486,023
Income (loss) before discontinued operations attributable to Calpine$ 0.39$ 0.41$ (0.36)$ 0.05
Discontinued operations, net of tax, attributable to Calpine $ 0.04 $ 0.06
Net income (loss) per common share attributable to Calpine - basic$ 0.39$ 0.45$ (0.36)$ 0.11
Diluted earnings (loss) per common share:    
Weighted average shares of common stock outstanding, diluted (in thousands)489,062487,443486,363487,199
Income (loss) before discontinued operations attributable to Calpine$ 0.39$ 0.41$ (0.36)$ 0.05
Discontinued operations, net of tax, attributable to Calpine $ 0.04 $ 0.06
Net income (loss) per common share attributable to Calpine - diluted$ 0.39$ 0.45$ (0.36)$ 0.11