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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of Asset Retirement Obligations A reconciliation of the ARO liabilities is as follows:
PNMRPNMTNMP
 (In thousands)
Liability at December 31, 2020$183,421 $182,718 $703 
Liabilities incurred1,781 1,781 — 
Liabilities settled(142)(142)— 
Accretion expense9,308 9,248 60 
Revisions to estimated cash flows(1)
39,778 39,778 — 
Liability at December 31, 2021234,146 233,383 763 
Liabilities incurred— — — 
Liabilities settled— — — 
Accretion expense10,767 10,702 65 
Revisions to estimated cash flows(2)
(21,536)(21,536)— 
Liability at December 31, 2022223,377 222,549 828 
Liabilities incurred— — — 
Liabilities settled(3,482)(3,482)— 
Accretion expense10,218 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.