Asset Retirement Obligations (Tables)

12 Months Ended

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.