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INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2015
INTANGIBLE ASSETS |
INTANGIBLE ASSETS | 14.INTANGIBLE ASSETS
| Weighted Average |  | Accumulated |
December 31, 2015 | Amortization Rate | Cost | Amortization | Net
(millions of Canadian dollars) |  |  |  |
Software | 11.6% | 1,295 | 516 | 779
Natural gas supply opportunities | 4.0% | 484 | 122 | 362
Power purchase agreements | 3.8% | 94 | 11 | 83
Land leases, permits and other | 4.2% | 163 | 39 | 124
|  | 2,036 | 688 | 1,348
| Weighted Average |  | Accumulated |
December 31, 2014 | Amortization Rate | Cost | Amortization | Net
(millions of Canadian dollars) |  |  |  |
Software | 12.9% | 1,049 | 337 | 712
Natural gas supply opportunities | 3.7% | 340 | 83 | 257
Power purchase agreements | 3.4% | 113 | 11 | 102
Land leases, permits and other | 4.0% | 124 | 29 | 95
|  | 1,626 | 460 | 1,166
Total amortization expense for intangible assets was $158 million (2014 - $106 million) for the year ended December 31, 2015. The Company expects amortization expense for intangible assets for the years ending December 31, 2016 through 20 20 of $180 million, $160 million, $144 million, $130 million and $117 million, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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