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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliation of Asset Retirement Obligations | A reconciliation of the ARO liabilities is as follows:
| PNMR |  | PNM |  | TNMP
| (In thousands)
Liability at December 31, 2019 | $ | 181,962 |  |  | $ | 181,081 |  |  | $ | 881 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (1,444) |  |  | (1,192) |  |  | (252) |
Accretion expense | 11,310 |  |  | 11,236 |  |  | 74 |
Revisions to estimated cash flows(1) | (8,407) |  |  | (8,407) |  |  | — |
Liability at December 31, 2020 | 183,421 |  |  | 182,718 |  |  | 703 |
Liabilities incurred | 1,781 |  |  | 1,781 |  |  | — |
Liabilities settled | (142) |  |  | (142) |  |  | — |
Accretion expense | 9,308 |  |  | 9,248 |  |  | 60 |
Revisions to estimated cash flows(2) | 39,778 |  |  | 39,778 |  |  | — |
Liability at December 31, 2021 | 234,146 |  |  | 233,383 |  |  | 763 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | — |  |  | — |  |  | — |
Accretion expense | 10,767 |  |  | 10,702 |  |  | 65 |
Revisions to estimated cash flows(3) | (21,536) |  |  | (21,536) |  |  | — |
Liability at December 31, 2022 | $ | 223,377 |  |  | $ | 222,549 |  |  | $ | 828 |
(1) Reflects a decrease of $9.2 million related to an updated PVNGS decommissioning study and an increase of $0.8 million related to an updated Four Corners decommissioning study. (2) Reflects impacts of newly approved remediation ordinance in San Juan county requiring the full demolition of SJGS. See Note 16. (3) Reflects a decrease of $21.5 million related to an updated SJGS decommissioning study.

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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 https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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