Equity (Tables)

3 Months Ended

Mar. 31, 2013

Equity

Schedule of reconciliation of equity

		Three months ended March 31, 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)			6.5			3.2			(1.9	)		7.8
Realized and unrealized loss on hedging activities, net of tax			0.3			—			—			0.3
Foreign currency translation adjustment, net of tax			(12.1	)		—			—			(12.1	)
Common shares issued for LTIP			0.3			—			—			0.3
Contribution by noncontrolling interest			—			—			2.0			2.0
Costs associated with tax equity raise			(0.7	)		—			—			(0.7	)
Dividends paid to noncontrolling interest			—			—			(1.0	)		(1.0	)
Dividends declared on common shares			(24.6	)		—			—			(24.6	)
Dividends declared on preferred shares of a subsidiary company			—			(3.2	)		—			(3.2	)

Balance at March 31		$	699.4		$	221.3		$	234.5		$	1,155.2

		Three months ended March 31, 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)			(42.3	)		3.2			(0.2	)		(39.3	)
Realized and unrealized loss on hedging activities, net of tax			0.2			—			—			0.2
Foreign currency translation adjustment, net of tax			17.2			—			—			17.2
Common shares issued for LTIP			0.2			—			—			0.2
Dividends declared on common shares			(32.4	)		—			—			(32.4	)
Dividends declared on preferred shares
of a subsidiary company			—			(3.2	)		—			(3.2	)

Balance at March 31		$	834.4		$	221.3		$	2.8		$	1,058.5