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INTANGIBLE ASSETS (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
INTANGIBLE ASSETS |  |  |
Cost | CAD 2,387 | CAD 2,036 |
Accumulated Amortization | 814 | 688 |
Net | 1,573 | 1,348 |
Amortization expenses |  |  |
Total amortization expense for intangible assets | 177 | CAD 158 | CAD 106
Expected amortization expense for intangible assets |  |  |
2017 | 198 |  |
2018 | 178 |  |
2019 | 159 |  |
2020 | 143 |  |
2021 | CAD 129 |  |
Software |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 11.80% | 11.60% |
Cost | CAD 1,388 | CAD 1,295 |
Accumulated Amortization | 607 | 516 |
Net | CAD 781 | CAD 779 |
Natural gas supply opportunities |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 3.20% | 4.00% |
Cost | CAD 435 | CAD 484 |
Accumulated Amortization | 127 | 122 |
Net | CAD 308 | CAD 362 |
Power purchase agreements |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 3.20% | 3.80% |
Cost | CAD 100 | CAD 94 |
Accumulated Amortization | 14 | 11 |
Net | CAD 86 | CAD 83 |
Customer relationships |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 3.00% |  |
Cost | CAD 251 |  |
Accumulated Amortization | 4 |  |
Net | CAD 247 |  |
Land leases, permits and other |  |  |
INTANGIBLE ASSETS |  |  |
Weighted Average Amortization Rate (as a percent) | 4.80% | 4.20% |
Cost | CAD 213 | CAD 163 |
Accumulated Amortization | 62 | 39 |
Net | CAD 151 | CAD 124 |

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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=66902209&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=66006027&loc=d3e16323-109275 + Details
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