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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
26. Asset Retirement Obligations |
Change in ARO |
The change in ARO for the years ended December 31 is as follows:
millions of Canadian dollars | 2020 | 2019
Balance, January 1 | $ | 185 | $ | 205
Additions |  | 10 |  | -
Liabilities settled (1) |  | (25) |  | (25)
Accretion included in depreciation expense |  | 9 |  | 7
Accretion deferred to regulatory asset (included in property, plant and equipment) |  | (3) |  | -
Other |  | 1 |  | 3
Change in foreign exchange rate |  | 1 |  | (5)
Balance, December 31 | $ | 178 | $ | 185
(1) Tampa Electric produces ash and other by-products, collectively known as CCR's, at its Big Bend and Polk power stations. The decreases in ARO in 2020 and 2019 are due to the closure of CCR management facilities.

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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