Equity (Tables)

6 Months Ended

Jun. 30, 2013

Equity

Schedule of reconciliation of equity

		Six months ended June 30, 2013

(in millions)		Total Atlantic Power Corporation Shareholders' Equity			Preferred shares issued by a subsidiary company			Noncontrolling Interests			Total Equity
Balance at January 1		$	729.7		$	221.3		$	235.4		$	1,186.4
Net income (loss)			3.5			6.3			(0.8	)		9.0
Realized and unrealized loss on hedging activities, net of tax			1.0			—			—			1.0
Foreign currency translation adjustment, net of tax			(30.1	)		—			—			(30.1	)
Common shares issued for LTIP			0.9			—			—			0.9
Contribution by and sale of noncontrolling interst			—			—			44.5			44.5
Costs associated with tax equity raise			(0.9	)		—			—			(0.9	)
Dividends paid to noncontrolling interest			—			—			(2.9	)		(2.9	)
Dividends declared on common shares			(35.5	)		—			—			(35.5	)
Dividends declared on preferred shares of a subsidiary company			—			(6.3	)		—			(6.3	)

Balance at June 30		$	668.6		$	221.3		$	276.2		$	1,166.1

		Six months ended June 30, 2012

		Total Atlantic Power Corporation Shareholders' Equity			Preferred shares issued by a subsidiary company			Noncontrolling Interests			Total Equity
Balance at January 1		$	891.5		$	221.3		$	3.0		$	1,115.8
Net income (loss)			(47.4	)		6.4			(0.3	)		(41.3	)
Realized and unrealized loss on hedging activities, net of tax			(0.1	)		—			—			(0.1	)
Foreign currency translation adjustment, net of tax			3.3			—			—			3.3
Common shares issued for LTIP			1.0			—			—			1.0
Dividends declared on common shares			(64.8	)		—			—			(64.8	)
Dividends declared on preferred shares of a subsidiary company			—			(6.4	)		—			(6.4	)

Balance at June 30		$	783.5		$	221.3		$	2.7		$	1,007.5