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

9 Months Ended

Sep. 30, 2013

Basic and diluted earnings (loss) per share

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

		Three months ended September 30,						Nine months ended September 30,

		2013			2012			2013			2012
Numerator:
Loss from continuing operations attributable to Atlantic Power Corporation		$	(40.9	)	$	(26.5	)	$	(31.8	)	$	(103.7	)
Income (loss) from discontinued operations, net of tax			(0.4	)		19.0			(6.1	)		48.8

Net loss attributable to Atlantic Power Corporation		$	(41.3	)	$	(7.5	)	$	(37.9	)	$	(54.9	)
Denominator:
Weighted average basic shares outstanding			120.0			119.0			119.8			115.4
Dilutive potential shares:
Convertible debentures			27.7			20.5			27.7			15.7
LTIP notional units			0.8			0.5			0.7			0.5

Potentially dilutive shares			148.5			140.0			148.2			131.6

Diluted loss per share from continuing operations attributable to Atlantic Power Corporation		$	(0.34	)	$	(0.22	)	$	(0.27	)	$	(0.90	)
Diluted earnings (loss) per share from discontinued operations			(0.00	)		0.16			(0.05	)		0.42

Diluted loss per share attributable to Atlantic Power Corporation		$	(0.34	)	$	(0.06	)	$	(0.32	)	$	(0.48	)