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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 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(1) | 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(2) | (21,536) |  |  | (21,536) |  |  | — |
Liability at December 31, 2022 | 223,377 |  |  | 222,549 |  |  | 828 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (3,482) |  |  | (3,482) |  |  | — |
Accretion expense | 10,218 |  |  | 10,148 |  |  | 70 |
Revisions to estimated cash flows(3) | 15,418 |  |  | 15,418 |  |  | — |
Liability at December 31, 2023 | $ | 245,531 |  |  | $ | 244,633 |  |  | $ | 898 |
(1) Reflects an increase of $39.8 million for the remediation ordinance in San Juan County requiring the full demolition of SJGS. (2) Reflects a decrease of $21.5 million related to an updated SJGS decommissioning study. (3) Reflects an increase of $15.4 million related to an updated PVNGS 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 -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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