CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Project revenue:
Energy sales	$ 75,968	$ 18,502
Energy capacity revenue	62,518	27,138
Transmission services	7,161	7,644
Other	21,963	381
Total project revenue	167,610	53,665
Project expenses:
Fuel	62,099	17,068
Operations and maintenance	31,500	11,072
Depreciation and amortization	36,468	10,879
Total project expenses	130,067	39,019
Project other income (expense):
Change in fair value of derivative instruments (Notes 6 and 7)	(58,122)	3,561
Equity in earnings of unconsolidated affiliates (Note 3)	2,947	1,311
Interest expense	(7,033)	(4,647)
Other income (expense), net	15	(2)
Total project other income (expense)	(62,193)	223
Project (loss) income	(24,650)	14,869
Administrative and other expenses (income):
Administration	7,833	4,054
Interest, net	22,036	3,968
Foreign exchange loss (gain) (Note 7)	986	(658)
Total administrative and other expenses (income)	30,855	7,364
Income (loss) from operations before income taxes	(55,505)	7,505
Income tax expense (benefit)	(16,291)	1,523
Net (loss) income	(39,214)	5,982
Net loss attributable to noncontrolling interest	(161)	(154)
Net income attributable to Preferred share dividends of a subsidiary company	3,239
Net (loss) income attributable to Atlantic Power Corporation	$ (42,292)	$ 6,136
Net (loss) income per share attributable to Atlantic Power Corporation shareholders: (Note 10)
Basic (in dollars per share)	$ (0.37)	$ 0.09
Diluted (in dollars per share)	$ (0.37)	$ 0.09
Weighted average number of common shares outstanding: (Note 10)
Basic (in shares)	113,578	67,654
Diluted (in shares)	113,578	68,171