Basic and diluted earnings (loss) per share (Tables)

3 Months Ended

Mar. 31, 2012

Basic and diluted earnings (loss) per share

Schedule of diluted net income and potentially dilutive shares utilized in the per share calculation

	2012			2011
Numerator:
Net income (loss) attributable to Atlantic Power Corporation	$	(42,292	)	$	6,136
Denominator:
Weighted average basic shares outstanding		113,578			67,654
Dilutive potential shares:
Convertible debentures		13,252			14,809
LTIP notional units		478			517
Potentially dilutive shares		127,308			82,980
Diluted EPS	$	(0.37	)	$	0.09