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Unaudited selected quarterly financial data (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Unaudited selected quarterly financial data | |||||||||||
| Project Revenue | $ 113,952,000 | $ 106,305,000 | $ 101,421,000 | $ 118,699,000 | $ 79,158,000 | $ 5,035,000 | $ 5,107,000 | $ 4,595,000 | $ 440,377,000 | $ 93,895,000 | $ 1,051,000 |
| Project (loss) income | (6,078,000) | 18,646,000 | (7,515,000) | (36,961,000) | 1,795,000 | (6,991,000) | (1,573,000) | 1,326,000 | (31,908,000) | (5,443,000) | 14,846,000 |
| Loss from continuing operations attributable to Atlantic Power Corporation | (20,052,000) | (24,589,000) | (21,375,000) | (50,763,000) | (25,903,000) | (38,420,000) | (613,000) | (6,882,000) | (129,235,000) | (74,585,000) | (27,879,000) |
| Income (loss) from discontinued operations | (34,515,000) | 20,106,000 | 19,319,000 | 11,549,000 | (811,000) | 10,442,000 | 13,682,000 | 12,864,000 | 16,459,000 | 36,177,000 | 24,127,000 |
| Net income (loss) attributable to Atlantic Power Corporation | $ (57,952,000) | $ (7,446,000) | $ (5,086,000) | $ (42,292,000) | $ (29,830,000) | $ (27,900,000) | $ 13,186,000 | $ 6,136,000 | $ (112,776,000) | $ (38,408,000) | $ (3,752,000) |
| Loss per share from continuing operations attributable to Atlantic Power Corporation (in dollars per share) | $ (0.20) | $ (0.23) | $ (0.21) | $ (0.47) | $ (0.25) | $ (0.56) | $ (0.01) | $ (0.10) | $ (1.11) | $ (0.96) | $ (0.45) |
| Earnings (loss) per share from discontinued operations (in dollars per share) | $ (0.29) | $ 0.17 | $ 0.17 | $ 0.10 | $ (0.01) | $ 0.16 | $ 0.20 | $ 0.19 | $ 0.14 | $ 0.46 | $ 0.39 |
| Net loss attributable to Atlantic Power Corporation (in dollars per share) | $ (0.49) | $ (0.06) | $ (0.04) | $ (0.37) | $ (0.26) | $ (0.40) | $ 0.19 | $ 0.09 | $ (0.97) | $ (0.50) | $ (0.06) |
| Weighted average number of common shares outstanding - basic | 119,372 | 119,011 | 113,682 | 113,578 | 113,088 | 68,910 | 68,573 | 67,654 | 116,426 | 77,466 | 61,706 |
| Diluted loss per share from continuing operations attributable to Atlantic Power Corporation (in dollars per share) | $ (0.20) | $ (0.23) | $ (0.21) | $ (0.47) | $ (0.25) | $ (0.56) | $ (0.01) | $ (0.10) | $ (1.11) | $ (0.96) | $ (0.45) |
| Diluted earnings (loss) per share from discontinued operations (in dollars per share) | $ (0.29) | $ 0.17 | $ 0.17 | $ 0.10 | $ (0.01) | $ 0.16 | $ 0.19 | $ 0.19 | $ 0.14 | $ 0.46 | $ 0.39 |
| Diluted earnings (loss) per share attributable to Atlantic Power Corporation | $ (0.49) | $ (0.06) | $ (0.04) | $ (0.37) | $ (0.26) | $ (0.40) | $ 0.18 | $ 0.09 | $ (0.97) | $ (0.50) | $ (0.06) |
| Weighted average number of common shares outstanding - diluted | 119,372 | 119,011 | 113,682 | 113,578 | 113,088 | 68,910 | 82,939 | 82,980 | 116,426 | 77,466 | 61,706 |
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- Definition
The net result for the period of deducting project expenses from project revenues. No definition available.
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The aggregate revenue, whether regulated or unregulated, derived from the generation, transmission and distribution of electricity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income or loss derived from discontinued operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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