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Asset Retirement Obligations (AROs) | 12 Months Ended
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Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations (AROs) | Asset Retirement Obligations (AROs) We have recognized AROs related to our coal-fired generation plants, natural gas combustion turbines and wind turbines. The cost of AROs include items such as site restoration, closure of ash pits, and removal of certain structures, generators, asbestos and storage tanks. We have other legal obligations associated with the retirement of a variety of other long-lived tangible assets used in electric operations where the estimated settlement costs are individually and collectively immaterial. We have no assets legally restricted for the settlement of any AROs. A reconciliation of the carrying amounts of AROs for the years ended December 31, 2021 and 2020 is as follows:
(in thousands) | 2021 |  | 2020
Beginning Balance | $ | 23,821 |  |  | $ | 12,656 |
New Obligations Recognized | — |  |  | 8,062 |
Adjustments Due to Revisions in Cash Flow Estimates | (568) |  |  | 3,110 |
Accrued Accretion | 938 |  |  | 570 |
Settlements | — |  |  | (577) |
Ending Balance | $ | 24,191 |  |  | $ | 23,821 |
The new AROs recognized during the year ended December 31, 2020 arose from obligations associated with our Merricourt wind farm and Astoria Station natural gas plant.

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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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