Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 2,222,929	$ 2,108,474	$ 1,741,750
Total Other Comprehensive Income	5,888	7,247	20,194
Ending Balance	2,244,926	2,222,929	2,108,474
Public Service Company of New Mexico
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	2,015,264	1,863,752	1,512,431
Total Other Comprehensive Income	(2,399)	6,575	20,544
Ending Balance	1,960,324	2,015,264	1,863,752
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(71,936)	(79,183)	(99,377)
Amounts reclassified from AOCI (pre-tax)	2,101	(2,320)	(2,937)
Income tax impact of amounts reclassified	(533)	589	746
Other OCI changes (pre-tax)	5,792	12,034	30,006
Income tax impact of other OCI changes	(1,472)	(3,056)	(7,621)
Total Other Comprehensive Income	5,888	7,247	20,194
Ending Balance	(66,048)	(71,936)	(79,183)
Total | Public Service Company of New Mexico
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(71,936)	(78,511)	(99,055)
Amounts reclassified from AOCI (pre-tax)	3,277	(1,417)	(1,197)
Income tax impact of amounts reclassified	(832)	360	304
Other OCI changes (pre-tax)	(6,493)	10,230	28,735
Income tax impact of other OCI changes	1,649	(2,598)	(7,298)
Total Other Comprehensive Income	(2,399)	6,575	20,544
Ending Balance	(74,335)	(71,936)	(78,511)
Unrealized Gains on Available-for-Sale Securities | Public Service Company of New Mexico
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	11,715	20,403	10,638
Amounts reclassified from AOCI (pre-tax)	(3,827)	(9,765)	(9,497)
Income tax impact of amounts reclassified	972	2,480	2,412
Other OCI changes (pre-tax)	(1,928)	(1,881)	22,586
Income tax impact of other OCI changes	490	478	(5,736)
Total Other Comprehensive Income	(4,293)	(8,688)	9,765
Ending Balance	7,422	11,715	20,403
Pension Liability Adjustment | Public Service Company of New Mexico
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(83,651)	(98,914)	(109,693)
Amounts reclassified from AOCI (pre-tax)	7,104	8,348	8,300
Income tax impact of amounts reclassified	(1,804)	(2,120)	(2,108)
Other OCI changes (pre-tax)	(4,565)	12,111	6,149
Income tax impact of other OCI changes	1,159	(3,076)	(1,562)
Total Other Comprehensive Income	1,894	15,263	10,779
Ending Balance	(81,757)	(83,651)	(98,914)
Fair Value Adjustment for Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0	(672)	(322)
Amounts reclassified from AOCI (pre-tax)	(1,176)	(903)	(1,740)
Income tax impact of amounts reclassified	299	229	442
Other OCI changes (pre-tax)	12,285	1,804	1,271
Income tax impact of other OCI changes	(3,121)	(458)	(323)
Total Other Comprehensive Income	8,287	672	(350)
Ending Balance	$ 8,287	$ 0	$ (672)