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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2017 | $ | 146,679 |  |  | $ | 145,707 |  |  | $ | 793 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (192) |  |  | — |  |  | — |
Accretion expense | 11,482 |  |  | 11,402 |  |  | 67 |
Revisions to estimated cash flows | 705 |  |  | 705 |  |  | — |
Liability at December 31, 2018 | 158,674 |  |  | 157,814 |  |  | 860 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (987) |  |  | (935) |  |  | (52) |
Accretion expense | 12,635 |  |  | 12,562 |  |  | 73 |
Revisions to estimated cash flows(1) | 11,640 |  |  | 11,640 |  |  | — |
Liability at December 31, 2019 | 181,962 |  |  | 181,081 |  |  | 881 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (1,444) |  |  | (1,192) |  |  | (252) |
Accretion expense | 11,310 |  |  | 11,235 |  |  | 75 |
Revisions to estimated cash flows(2) | (8,407) |  |  | (8,407) |  |  | — |
Liability at December 31, 2020 | $ | 183,421 |  |  | $ | 182,717 |  |  | $ | 704 |
(1) Reflects the impacts of an updated SJGS decommissioning study that assumes PNM will retire its share of SJGS in 2022. (2) 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.

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