Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2021

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, 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	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		11,236		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

(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.