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ACQUISITIONS AND DISPOSITIONS - ACQUISITIONS (Details) CAD in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Feb. 27, 2015 USD ($) | Feb. 27, 2015 CAD | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CAD | Nov. 30, 2015 USD ($) MW | Nov. 30, 2015 CAD MW | Dec. 31, 2014 CAD | Oct. 31, 2014 CAD | Jul. 31, 2013 CAD | Dec. 31, 2015 CAD | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CAD | Dec. 31, 2013 USD ($) | Dec. 31, 2013 CAD | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CAD | Nov. 30, 2015 CAD | Feb. 27, 2015 CAD | Dec. 31, 2012 | Dec. 31, 2011
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  | CAD 106 |  | CAD 394 |  |  |  |  |  |  |  |
Magic Valley and Wildcat Wind Farms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  | 80.00% |  |  | 80.00% |  |  |  |  | 80.00% |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | CAD 747 |  |  | CAD 747 |  |  |  |  | CAD 747 |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 12 |  |  | 12 |  |  |  |  | 12 |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  | (14) |  |  | (14) |  |  |  |  | (14) |  |  |  |  |  |  |  |
Noncontrolling interests (Note 20) |  |  |  | (351) |  |  | (351) |  |  |  |  | (351) |  |  |  |  |  |  |  |
Net assets acquired |  |  |  | CAD 394 |  |  | CAD 394 |  |  |  |  | CAD 394 |  |  |  |  |  |  |  |
Percentage of non-controlling interests remaining for determining fair value of non-controlling interest |  |  |  | 20.00% |  |  | 20.00% |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 340 | CAD 394 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues since date of acquisition |  |  |  |  |  |  |  |  |  |  |  | CAD 0 |  |  |  |  |  |  |  |
Earnings since date of acquisition |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Increase in revenues from acquisition |  |  |  |  |  |  |  |  |  |  | $ 58 | 64 | $ 43 | CAD 44 |  |  |  |  |  |
Increase (decrease) in earnings from acquisition |  |  |  |  |  |  |  |  |  |  | $ 7 | CAD 8 | $ (2) | CAD (2) |  |  |  |  |  |
Midstream Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | CAD 69 |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109 |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 85 | CAD 106 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2 | CAD 3 |  | 3 |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues since date of acquisition |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Earnings since date of acquisition |  |  |  |  |  |  |  |  |  | CAD 0 |  |  |  |  |  |  |  |  |  |
Contingent future payment earnout period | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Midstream Business | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | CAD 21 |  |
New Creek Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  | $ 26 |  |  |  |  |  |  |  |  |  |  |  | CAD 35 |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 36 | CAD 48 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wind project capacity | MW |  |  |  |  | 103 | 103 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Massif du Sud Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  | 30.00% |  |  | 30.00% |  |  |  |  | 30.00% |  |  |  |  |  |  | 50.00% |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | CAD 97 |  |  | CAD 97 |  |  |  |  | CAD 97 |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | CAD 102 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  | 80.00% |  |  | 80.00% |  |  |  |  | 80.00% |  |  |  |  |  |  |  |
Lac Alfred Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  |  |  |  |  | 17.50% |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  | CAD 115 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  | CAD 121 |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  | 67.50% |  |  |  |  |  |  |  |  |  |  |  |
Saint Robert Bellarmin Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS AND DISPOSITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as a percent) |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  | CAD 100 |  |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  | CAD 106 |  |  |  |  |  |  |  |  |  |  |

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