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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2019
Asset Retirement Obligations |
Asset Retirement Obligations | 25. ASSET RETIREMENT OBLIGATIONS AROs mostly relate to reclamation of land at the thermal, hydro and combustion turbine sites; and the disposal of polychlorinated biphenyls in transmission and distribution equipment and a pipeline site. Certain hydro, transmission and distribution ass ets may have additional AROs that cannot be measured as these assets are expected to be used for an indefinite period and, as a result, a reasonable estimate of the fair value of any related ARO cannot be made.
The change in ARO for the years ended December 31 is as follows:
millions of Canadian dollars | 2019 | 2018
Balance, January 1 | $ | 205 | $ | 172
Additions (1) |  | - |  | 25
Liabilities settled (1) |  | (25) |  | (2)
Accretion included in depreciation expense |  | 7 |  | 6
Other |  | 3 |  | (1)
Change in foreign exchange rate |  | (5) |  | 5
Balance, December 31 | $ | 185 | $ | 205
(1) Tampa Electric produces ash and other by-products, collectively known as CCR's, at its Big Bend and Polk power stations. The increase in ARO in 2018 was to achieve compliance with the US Environmental Protection Agency's CCR rule due to the closure of a CCR management facility that began in 2018. The closure was completed in 2019.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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