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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Regulatory Assets
Current	$ 73,046	$ 20,265
Non-Current	914,381	846,686
Regulatory Liabilities
Current	(140,005)	(17,002)
Non-Current	(771,317)	(755,202)
PNM
Regulatory Assets
Current	72,996	18,333
Non-Current	838,727	763,941
Total regulatory assets	911,723	782,274
Regulatory Liabilities
Current	(134,846)	(7,913)
Non-Current	(565,021)	(556,989)
Total regulatory liabilities	(699,867)	(564,902)
PNM | SJGS Rate Reunds
Regulatory Liabilities
Current	(113,372)	0
PNM | PVNGS rate refunds
Regulatory Liabilities
Current	(19,194)	0
Non-Current	(19,194)	0
PNM | Renewable energy rider, including excess return
Regulatory Liabilities
Current	0	(5,076)
PNM | Energy efficiency costs
Regulatory Liabilities
Current	(1,454)	(2,837)
PNM | Transmission cost recovery factor
Regulatory Liabilities
Current	0	0
PNM | NMPRC hedging plan
Regulatory Liabilities
Current	(826)	0
PNM | Cost of removal
Regulatory Liabilities
Non-Current	(247,627)	(238,903)
PNM | Deferred income taxes
Regulatory Liabilities
Non-Current	(281,588)	(301,493)
PNM | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	(14,463)	(15,610)
PNM | Pension and OPEB
Regulatory Liabilities
Non-Current	0	0
PNM | COVID-19 cost savings
Regulatory Liabilities
Non-Current	(900)	(900)
PNM | Other
Regulatory Liabilities
Non-Current	(1,249)	(83)
PNM | FPPAC
Regulatory Assets
Current	65,251	8,904
PNM | NMPRC hedging plan
Regulatory Assets
Current	0	9,429
PNM | Energy efficiency costs
Regulatory Assets
Current	0	0
PNM | Renewable energy rider
Regulatory Assets
Current	5,021	0
PNM | SJGS Energy Transition Property
Regulatory Assets
Current	2,724	0
Non-Current	340,629	343,238
PNM | SJGS - non-ETA
Regulatory Assets
Non-Current	122,246	129,285
PNM | PVNGS leased interest
Regulatory Assets
Non-Current	80,777	0
PNM | EIM
Regulatory Assets
Non-Current	18,731	13,102
PNM | TEP
Regulatory Assets
Non-Current	2,644	0
PNM | Loss on reacquired debt
Regulatory Assets
Non-Current	13,806	15,323
PNM | Pension and OPEB
Regulatory Assets
Non-Current	172,508	187,182
PNM | Deferred income taxes
Regulatory Assets
Non-Current	71,359	67,621
PNM | AMS surcharge
Regulatory Assets
Non-Current	0	0
PNM | AMS retirement and other costs
Regulatory Assets
Non-Current	0	0
PNM | Deferred COVID-19 costs
Regulatory Assets
Non-Current	5,664	5,664
PNM | Other
Regulatory Assets
Non-Current	10,363	2,526
TNMP
Regulatory Assets
Current	50	1,932
Non-Current	75,654	82,745
Total regulatory assets	75,704	84,677
Regulatory Liabilities
Current	(5,159)	(9,089)
Non-Current	(206,296)	(198,213)
Total regulatory liabilities	(211,455)	(207,302)
TNMP | SJGS Rate Reunds
Regulatory Liabilities
Current	0	0
TNMP | PVNGS rate refunds
Regulatory Liabilities
Current	0	0
Non-Current	0	0
TNMP | Renewable energy rider, including excess return
Regulatory Liabilities
Current	0	0
TNMP | Energy efficiency costs
Regulatory Liabilities
Current	0	0
TNMP | Transmission cost recovery factor
Regulatory Liabilities
Current	(5,159)	(9,089)
TNMP | NMPRC hedging plan
Regulatory Liabilities
Current	0	0
TNMP | Cost of removal
Regulatory Liabilities
Non-Current	(117,759)	(97,030)
TNMP | Deferred income taxes
Regulatory Liabilities
Non-Current	(83,459)	(94,994)
TNMP | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	0	0
TNMP | Pension and OPEB
Regulatory Liabilities
Non-Current	(3,644)	(4,518)
TNMP | COVID-19 cost savings
Regulatory Liabilities
Non-Current	0	0
TNMP | Other
Regulatory Liabilities
Non-Current	(1,434)	(1,671)
TNMP | FPPAC
Regulatory Assets
Current	0	0
TNMP | NMPRC hedging plan
Regulatory Assets
Current	0	0
TNMP | Energy efficiency costs
Regulatory Assets
Current	50	1,932
TNMP | Renewable energy rider
Regulatory Assets
Current	0	0
TNMP | SJGS Energy Transition Property
Regulatory Assets
Current	0	0
Non-Current	0	0
TNMP | SJGS - non-ETA
Regulatory Assets
Non-Current	0	0
TNMP | PVNGS leased interest
Regulatory Assets
Non-Current	0	0
TNMP | EIM
Regulatory Assets
Non-Current	0	0
TNMP | TEP
Regulatory Assets
Non-Current	0	0
TNMP | Loss on reacquired debt
Regulatory Assets
Non-Current	25,019	26,317
TNMP | Pension and OPEB
Regulatory Assets
Non-Current	21,854	21,558
TNMP | Deferred income taxes
Regulatory Assets
Non-Current	8,882	9,193
TNMP | AMS surcharge
Regulatory Assets
Non-Current	0	6,254
TNMP | AMS retirement and other costs
Regulatory Assets
Non-Current	12,343	12,591
TNMP | Deferred COVID-19 costs
Regulatory Assets
Non-Current	0	1,053
TNMP | Other
Regulatory Assets
Non-Current	$ 7,556	$ 5,779

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