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Lease Commitments - Narrative (Details) $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Apr. 30, 2024 USD ($)	Jan. 31, 2024 USD ($)	Jan. 31, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 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	$ 28,372
Reduction to inventories						17,110	14,283
Unamortized cost, right-of-way lease payments				$ 69,000		69,000		$ 56,200
Operating lease, right-of-use asset, amortization expense				$ 1,000	$ 900	$ 2,100	1,800
Non-lease component, percent of lease liability				25.50%		25.50%
Lessee, operating lease, unguaranteed residual value				$ 22,800		$ 22,800
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	28,372
Reduction to inventories						10,671	11,334
Lessee, operating lease, unguaranteed residual value				$ 11,200		11,200
PNM | Equipment
Operating Leased Assets [Line Items]
Operating lease, residual value of leased asset				800		800
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						6,439	$ 2,949
Lessee, operating lease, unguaranteed residual value				11,600		11,600
TNMP | Equipment
Operating Leased Assets [Line Items]
Operating lease, residual value of leased asset				$ 1,000		$ 1,000

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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-SubTopic 10
-Topic 230
-Publisher FASB
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Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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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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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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