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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; 2013 - $82 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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