NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
When property, plant and equipment is disposed of or retired, the related cost, accumulated depreciation and any accumulated impairment losses are eliminated. Depreciation is based on the cost of the asset less its residual value and is calculated using the straight-line method over the estimated useful life of the asset from the date the asset is available for use at the following annual rates (per cent):
Distribution
1.5 to 4.5 2.1 to 20.0 4.0 to 75.0 1.6 to 63.2 1.9 to 20.0 12.9 to 24.5
Transmission and storage
Energy services
Gathering, treatment and compression
Vehicles, equipment and other
Computer hardware
The estimated useful lives, decommissioning costs and method of depreciation are based on periodic depreciation studies with annual reviews for reasonableness. m. Impairment i. Financial assets Financial assets, other than those classified as at fair value through profit or loss, are reviewed at each reporting date to determine whether there is any indication of impairment. Loss allowances are recognized for ECLs on financial assets measured at amortized cost and debt instruments designated as FVOCI. Loss allowances for trade receivables are measured at an amount equal to lifetime ECL. Debt instruments and other receivables that are determined to have low credit risk at the reporting date are measured at 12-month ECL. Impairment is the financial loss if a customer or counterparty to a financial instrument fails to meet its contractual obligations and arises principally from receivables from customers. The Corporation considers impairment for trade and other receivables on both an individual and a collective basis. In assessing collective impairment, the Corporation uses historical trends of the likelihood of default, timing of recoveries and the amount of losses incurred, adjusted for management’s judgment as to the impact of current and future economic and credit conditions. The carrying amount of trade and other receivables is reduced through the use of an allowance account. Once reasonable collection efforts have been exhausted, and a trade and other receivable balance is considered uncollectible, it is written off against the allowance account. Subsequent recoveries of amounts previously written off are credited against the allowance account. Changes in the carrying amount of the allowance account are recognized immediately as an impairment loss on trade and other receivables in the consolidated statement of comprehensive income. ii. Non-financial assets At each reporting date, the Corporation reviews the carrying amount of its non-financial assets to determine whether there is any indication of impairment. If any such indication exists, the recoverable amount of the asset is estimated. The recoverable amount of an asset is the higher of fair value less costs of disposal and value in use. If the recoverable amount of an asset is estimated to be less than its carrying amount, the carrying amount is reduced to its recoverable amount, and an impairment loss is recognized immediately in other losses. Assets that cannot be tested individually, including corporate assets, are grouped together into cash-generating units (CGUs), the smallest group of assets that generates cash inflow from continuing use. Impairment losses recognized in prior periods are assessed at each reporting date for any indications that the loss has decreased or no longer exists. An impairment loss is reversed only to the extent that the carrying amount of the asset (or CGU) does not exceed the carrying amount that would have been determined, net of amortization or depreciation, if no impairment loss had been recognized.
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