INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of intangible assets

The following table provides the weighted average amortization rate, gross carrying value, accumulated amortization and net carrying value for each of our major classes of intangible assets:

	Weighted Average			Accumulated
December 31, 20171	Amortization Rate		Cost	Amortization	Net
(millions of Canadian dollars)
Customer relationships	3.5	%	967	41	926
Power purchase agreements	3.5	%	99	17	82
Project agreement2	4.0	%	150	3	147
Software	11.3	%	1,760	714	1,046
Other intangible assets3	4.4	%	1,162	96	1,066
			4,138	871	3,267

1 Certain assets were reclassified as held for sale as at December 31, 2017 (Note 7).

2 Represents a project agreement acquired from the Merger Transaction (Note 7).

3 The measurement of weighted average amortization rate excludes non-depreciable intangible assets.

	Weighted Average			Accumulated
December 31, 2016	Amortization Rate		Cost	Amortization	Net
(millions of Canadian dollars)
Customer relationships	3.0	%	251	4	247
Natural gas supply opportunities	3.2	%	435	127	308
Power purchase agreements	3.2	%	100	14	86
Software	11.8	%	1,388	607	781
Other intangible assets	4.8	%	213	62	151
			2,387	814	1,573

Schedule of future amortization expense

The following table presents our forecast of amortization expense associated with existing intangible assets for the years indicated as follows in millions of Canadian dollars:

2018	2019	2020	2021	2022
264	240	217	197	179