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INTANGIBLE ASSETS (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
INTANGIBLE ASSETS |  |  |
Cost | CAD 2,036 | CAD 1,626 |
Accumulated Amortization | 688 | 460 |
Finite-Lived Intangible Assets, Net, Total | 1,348 | 1,166 |
Amortization expenses |  |  |
Total amortization expense for intangible assets | 158 | CAD 106 | CAD 82
Expected aggregate amortization expense |  |  |
2016 | 180 |  |
2017 | 160 |  |
2018 | 144 |  |
2019 | 130 |  |
2020 | CAD 117 |  |
Software |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 11.60% | 12.90% |
Cost | CAD 1,295 | CAD 1,049 |
Accumulated Amortization | 516 | 337 |
Finite-Lived Intangible Assets, Net, Total | CAD 779 | CAD 712 |
Natural gas supply opportunities |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 4.00% | 3.70% |
Cost | CAD 484 | CAD 340 |
Accumulated Amortization | 122 | 83 |
Finite-Lived Intangible Assets, Net, Total | CAD 362 | CAD 257 |
Power purchase agreements |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 3.80% | 3.40% |
Cost | CAD 94 | CAD 113 |
Accumulated Amortization | 11 | 11 |
Finite-Lived Intangible Assets, Net, Total | CAD 83 | CAD 102 |
Land leases, permits and other |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 4.20% | 4.00% |
Cost | CAD 163 | CAD 124 |
Accumulated Amortization | 39 | 29 |
Finite-Lived Intangible Assets, Net, Total | CAD 124 | CAD 95 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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