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INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2012
INTANGIBLE ASSETS |
INTANGIBLE ASSETS | 13. INTANGIBLE ASSETS
|  | Weighted Average |  |  |  | Accumulated |  |  |
December 31, 2012 |  | Amortization Rate |  | Cost |  | Amortization |  | Net |
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |
Software |  | 11.9% |  | 622 |  | 180 |  | 442 |
Natural gas supply opportunities |  | 3.8% |  | 291 |  | 50 |  | 241 |
Power purchase agreements |  | 4.7% |  | 85 |  | 4 |  | 81 |
Transportation agreements |  | 2.9% |  | 50 |  | 13 |  | 37 |
Other |  | 5.6% |  | 20 |  | 4 |  | 16 |
|  |  |  | 1,068 |  | 251 |  | 817 |
|  | Weighted Average |  |  |  | Accumulated |  |  |
December 31, 2011 |  | Amortization Rate |  | Cost |  | Amortization |  | Net |
(millions of Canadian dollars) |  |  |  |  |  |  |  |  |
Software |  | 12.7% |  | 471 |  | 155 |  | 316 |
Natural gas supply opportunities |  | 3.6% |  | 296 |  | 39 |  | 257 |
Power purchase agreements |  | 4.6% |  | 78 |  | 2 |  | 76 |
Transportation agreements |  | 2.9% |  | 53 |  | 10 |  | 43 |
Other |  | 6.0% |  | 27 |  | 8 |  | 19 |
|  |  |  | 925 |  | 214 |  | 711 |
Total amortization expense for intangible assets was $64 million (2011 - $58 million; 2010 - $52 million) for the year ended December 31, 2012. The Company expects aggregate amortization expense for the years ending December 31, 2013 through 2017 of $67 million, $61 million, $55 million, $49 million and $44 million, respectively.

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