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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Regulatory Assets
Regulatory assets - Current	$ 41,492	$ 73,046
Non-Current	962,003	914,381
Regulatory Liabilities
Current	(34,173)	(140,005)
Non-Current	(748,738)	(771,317)
PNM
Regulatory Assets
Regulatory assets - Current	36,224	72,996
Non-Current	857,310	838,727
Total regulatory assets	893,534	911,723
Regulatory Liabilities
Current	(33,571)	(134,846)
Non-Current	(518,701)	(565,021)
Total regulatory liabilities	(552,272)	(699,867)
PNM | SJGS rate refunds
Regulatory Liabilities
Current	(157)	(113,372)
PNM | PVNGS rate refunds
Regulatory Liabilities
Current	(19,194)	(19,194)
Non-Current	(3,277)	(19,194)
PNM | Renewable energy rider
Regulatory Liabilities
Current	(4,786)	0
PNM | Energy efficiency costs
Regulatory Liabilities
Current	(2,459)	(1,454)
PNM | Transmission cost recovery factor
Regulatory Liabilities
Current	0	0
PNM | SJGS Energy Transition Property
Regulatory Liabilities
Current	(6,975)	0
PNM | NMPRC Hedging Plan
Regulatory Liabilities
Current	0	(826)
PNM | Cost of removal
Regulatory Liabilities
Non-Current	(247,280)	(247,627)
PNM | Deferred income taxes
Regulatory Liabilities
Non-Current	(253,158)	(281,588)
PNM | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	(13,317)	(14,463)
PNM | Pension and OPEB
Regulatory Liabilities
Non-Current	0	0
PNM | COVID-19 cost savings
Regulatory Liabilities
Non-Current	(469)	(900)
PNM | Other
Regulatory Liabilities
Non-Current	(1,200)	(1,249)
PNM | FPPAC
Regulatory Assets
Regulatory assets - Current	30,487	65,251
PNM | NMPRC Hedging Plan
Regulatory Assets
Regulatory assets - Current	5,737	0
PNM | Transmission cost recovery factor
Regulatory Assets
Regulatory assets - Current	0	0
PNM | Energy efficiency costs
Regulatory Assets
Regulatory assets - Current	0	0
PNM | Renewable energy rider
Regulatory Assets
Regulatory assets - Current	0	5,021
PNM | SJGS Energy Transition Property
Regulatory Assets
Regulatory assets - Current	0	2,724
Non-Current	336,079	340,629
PNM | SJGS ETA
Regulatory Assets
Non-Current	24,996	0
PNM | SJGS - non-ETA
Regulatory Assets
Non-Current	114,333	122,246
PNM | PVNGS leased interest
Regulatory Assets
Non-Current	82,982	80,777
PNM | EIM
Regulatory Assets
Non-Current	15,189	18,731
PNM | TEP
Regulatory Assets
Non-Current	4,942	2,644
PNM | Loss on reacquired debt
Regulatory Assets
Non-Current	12,507	13,806
PNM | Pension and OPEB
Regulatory Assets
Non-Current	176,171	172,508
PNM | Deferred income taxes
Regulatory Assets
Non-Current	74,925	71,359
PNM | Excess ADIT
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	3,328	5,664
PNM | Hurricane Beryl
Regulatory Assets
Non-Current	0	0
PNM | Other
Regulatory Assets
Non-Current	11,858	10,363
TNMP
Regulatory Assets
Regulatory assets - Current	5,268	50
Non-Current	104,693	75,654
Total regulatory assets	109,961	75,704
Regulatory Liabilities
Current	(602)	(5,159)
Non-Current	(230,037)	(206,296)
Total regulatory liabilities	(230,639)	(211,455)
TNMP | SJGS rate refunds
Regulatory Liabilities
Current	0	0
TNMP | PVNGS rate refunds
Regulatory Liabilities
Current	0	0
Non-Current	0	0
TNMP | Renewable energy rider
Regulatory Liabilities
Current	0	0
TNMP | Energy efficiency costs
Regulatory Liabilities
Current	(602)	0
TNMP | Transmission cost recovery factor
Regulatory Liabilities
Current	0	(5,159)
TNMP | SJGS Energy Transition Property
Regulatory Liabilities
Current
TNMP | NMPRC Hedging Plan
Regulatory Liabilities
Current	0	0
TNMP | Cost of removal
Regulatory Liabilities
Non-Current	(147,296)	(117,759)
TNMP | Deferred income taxes
Regulatory Liabilities
Non-Current	(80,152)	(83,459)
TNMP | Renewable energy tax benefits
Regulatory Liabilities
Non-Current	0	0
TNMP | Pension and OPEB
Regulatory Liabilities
Non-Current	(2,589)	(3,644)
TNMP | COVID-19 cost savings
Regulatory Liabilities
Non-Current	0	0
TNMP | Other
Regulatory Liabilities
Non-Current	0	(1,434)
TNMP | FPPAC
Regulatory Assets
Regulatory assets - Current	0	0
TNMP | NMPRC Hedging Plan
Regulatory Assets
Regulatory assets - Current	0	0
TNMP | Transmission cost recovery factor
Regulatory Assets
Regulatory assets - Current	5,268	0
TNMP | Energy efficiency costs
Regulatory Assets
Regulatory assets - Current	0	50
TNMP | Renewable energy rider
Regulatory Assets
Regulatory assets - Current	0	0
TNMP | SJGS Energy Transition Property
Regulatory Assets
Regulatory assets - Current	0	0
Non-Current	0	0
TNMP | SJGS ETA
Regulatory Assets
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	23,721	25,019
TNMP | Pension and OPEB
Regulatory Assets
Non-Current	21,087	21,854
TNMP | Deferred income taxes
Regulatory Assets
Non-Current	8,570	8,882
TNMP | Excess ADIT
Regulatory Assets
Non-Current	6,542	0
TNMP | AMS retirement and other costs
Regulatory Assets
Non-Current	12,851	12,343
TNMP | Deferred COVID-19 costs
Regulatory Assets
Non-Current	0	0
TNMP | Hurricane Beryl
Regulatory Assets
Non-Current	20,958	0
TNMP | Other
Regulatory Assets
Non-Current	$ 10,964	$ 7,556

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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