SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2018

Corporate Information And Statement Of IFRS Compliance [Abstract]

Disclosure of estimated useful lives of property, plant and equipment

Depreciation of an asset commences when it is available for use. Property, plant and equipment are depreciated on a straight line or declining-balance basis over the estimated useful lives of each component of the assets as follows:



Buildings		Up to 75 years
Transmission stations, towers and related fixtures		Up to 40 years
Leasehold improvements		Up to 50 years
Plant and equipment		Up to 40 years
Network systems		Up to 65 years
Track		Up to 40 years
District energy systems		Up to 50 years
Gas storage assets		Up to 50 years