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ASSET RETIREMENT OBLIGATIONS
12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation [Abstract]  
ASSET RETIREMENT OBLIGATIONS ASSET RETIREMENT OBLIGATIONS
FirstEnergy has recognized applicable legal obligations for AROs and their associated cost, including reclamation of sludge disposal ponds, closure of coal ash disposal sites, underground and above-ground storage tanks and wastewater treatment lagoons. In addition, FirstEnergy has recognized conditional retirement obligations, primarily for asbestos remediation.

The following table summarizes the changes to the ARO balances during 2021 and 2020:
ARO Reconciliation(In millions)
Balance, January 1, 2020$856 
Liabilities settled (1)
(744)
Accretion47 
Balance, December 31, 2020$159 
Changes in timing and amount of estimated cash flows
Liabilities settled(1)
Accretion13 
Balance, December 31, 2021$179 
(1) Includes $726 million related to the closing of the asset purchase and sale agreement with TMI-2 Solutions, LLC, a subsidiary of EnergySolutions, LLC, concerning the transfer and dismantlement of TMI-2.