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Lease Commitments - Narrative (Details) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
	Apr. 30, 2024 USD ($)	Jan. 31, 2024 USD ($)	Jan. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jan. 15, 2016 lease	Jan. 15, 2015 lease
Operating Leased Assets [Line Items]
Proceeds from sale of productive assets						$ 2,840	$ 32,654
Reduction to inventories						22,484	16,657
Unamortized cost, right-of-way lease payments				$ 67,800		67,800		$ 56,200
Operating lease, right-of-use asset, amortization expense				$ 1,100	$ 800	$ 3,200	2,600
Non-lease component, percent of lease liability				25.50%		25.50%
Lessee, operating lease, unguaranteed residual value				$ 22,900		$ 22,900
Lease to be executed, fixed consideration				$ 1,100,000		$ 1,100,000
Lease to be executed, term of contract				20 years		20 years
Materials, Supplies, and Fuel Stock
Operating Leased Assets [Line Items]
Reduction to inventories		$ (600)	$ (5,300)
PNM Owned Assets
Operating Leased Assets [Line Items]
Proceeds from sale of productive assets		3,400	33,700
Net Utility Plant
Operating Leased Assets [Line Items]
Proceeds from sale of productive assets		$ 2,800	$ 28,400
Equipment
Operating Leased Assets [Line Items]
Operating lease, residual value of leased asset				$ 1,700		$ 1,700
Battery Storage
Operating Leased Assets [Line Items]
Operating lease, term of contract				20 years		20 years
PNM
Operating Leased Assets [Line Items]
Proceeds from sale of productive assets						$ 2,840	32,654
Reduction to inventories						13,928	12,300
Lessee, operating lease, unguaranteed residual value				$ 11,800		11,800
PNM | Equipment
Operating Leased Assets [Line Items]
Operating lease, residual value of leased asset				700		700
PNM | Palo Verde Nuclear Generating Station, Unit 1 and 4 Leases
Operating Leased Assets [Line Items]
Number of leases, expiring | lease										4
Number of leases under which lease term was extended | lease										4
PNM | Palo Verde Nuclear Generating Station, Unit 2 Leases
Operating Leased Assets [Line Items]
Number of leases, expiring | lease									4
Number of leases under which lease term was extended | lease									1
PNM | Navajo Nation
Operating Leased Assets [Line Items]
Annual lease payments						6,000
Right-of-way lease payments	$ 8,600
TNMP
Operating Leased Assets [Line Items]
Reduction to inventories						8,556	$ 4,357
Lessee, operating lease, unguaranteed residual value				11,100		11,100
TNMP | Equipment
Operating Leased Assets [Line Items]
Operating lease, residual value of leased asset				$ 900		$ 900

X

- Definition

Lessee, Operating Lease, Lease Not Yet Commenced, Fixed Consideration

+ References

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
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-Topic 230
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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+ References

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Amount of residual asset covered by residual value guarantee under operating lease. Excludes guarantee considered to be lease payments for lessor.

+ References

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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