INTANGIBLE ASSETS

12 Months Ended

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.