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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Reconciliation of Asset Retirement Obligations Liabilities
A reconciliation of the ARO liabilities is as follows:
TXNM
PNMTNMP
 (In thousands)
Liability at December 31, 2021$234,146 $233,383 $763 
Liabilities incurred— — — 
Liabilities settled— — — 
Accretion expense10,767 10,702 65 
Revisions to estimated cash flows(1)
(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(2)
15,418 15,418 — 
Liability at December 31, 2023245,531 244,633 898 
Liabilities incurred— — — 
Liabilities settled(12,451)(12,432)(19)
Accretion expense11,538 11,462 76 
Revisions to estimated cash flows
— — — 
Liability at December 31, 2024$244,618 $243,663 $955 

(1) Reflects a decrease of $21.5 million related to an updated SJGS decommissioning study.
(2) Reflects an increase of $15.4 million related to an updated PVNGS decommissioning study.