Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations

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Asset Retirement Obligations
9 Months Ended
Sep. 30, 2021
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
Asset Retirement Obligations
NOTE 12 – Asset Retirement Obligations
The Company has asset retirement obligations ("ARO") associated with the future environmental remediation responsibility to restore the land and remove biogas plants and related facilities within one year of the expiration of certain
operating lease agreements. The fair value of the ARO is measured using expected cash outflows associated with the ARO, adjusted for inflation and discounted at our credit-adjusted risk-free rate when the liability is initially recorded. Accretion expense is recognized over time as the discounted liability is accreted to its expected settlement value.
The following summarizes changes in the Company’s ARO liabilities for the year-to-date periods ending September 30, 2021 and December 31, 2020:
(in thousands)
2021 2020
Balance at beginning of period
$ 306  $ — 
Liabilities acquired(1)
3,580  — 
Liabilities incurred
—  306 
Accretion expense
18  — 
Balance at end of period $ 3,904  $ 306 
(1) Liabilities acquired relate to asset retirement obligations assumed in the Aria Merger. See Note 4.
Aria Energy LLC  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]  
Asset Retirement Obligations Asset Retirement Obligations - Predecessor
The following table presents the activity for the AROs for the periods ended September 14, 2021 and December 31, 2020:
(in thousands) January 1 to September 14, 2021 January 1 to December 31, 2020
Balance at beginning of period $ 3,408  $ 6,536 
Accretion expense 172  456 
Revision to estimated cash flows —  — 
Transfer to liabilities classified as held for sale —  (3,584)
Settlement of asset retirement obligation —  — 
Balance at end of period $ 3,580  $ 3,408 
Accretion expense represents the increase in asset retirement obligations over the remaining operational life of the asset and is recognized in depreciation, amortization and accretion.