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Lease Commitments - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2025 USD ($) | Jan. 31, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Jan. 15, 2016 lease | Jan. 15, 2015 lease
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of plant assets |  |  |  |  | $ 0 | $ 2,840 |  |  |
Materials and supplies |  |  |  |  | (4,313) | (17,110) |  |  |
Unamortized cost, right-of-way lease payments |  |  | $ 61,300 |  | 61,300 |  | $ 67,100 |  |
Operating lease, right-of-use asset, amortization expense |  |  | $ 1,200 | $ 1,000 | $ 2,200 | 2,100 |  |  |
Non-lease component, percent of lease liability |  |  | 25.50% |  | 25.50% |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | $ 25,200 |  | $ 25,200 |  |  |  |
Lease to be executed, fixed consideration |  |  | $ 226,300 |  | $ 226,300 |  |  |  |
Lease to be executed, term of contract |  |  | 20 years |  | 20 years |  |  |  |
Materials, Supplies, and Fuel Stock |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Materials and supplies |  | $ 600 |  |  |  |  |  |  |
PNM Owned Assets |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of plant assets |  | 3,400 |  |  |  |  |  |  |
Net Utility Plant |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of plant assets |  | $ 2,800 |  |  |  |  |  |  |
Equipment |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | $ 1,400 |  | $ 1,400 |  |  |  |
Public Service Company of New Mexico |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of plant assets |  |  |  |  | 0 | 2,840 |  |  |
Materials and supplies |  |  |  |  | (375) | (10,671) |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 12,900 |  | 12,900 |  |  |  |
Public Service Company of New Mexico | Equipment |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | 700 |  | 700 |  |  |  |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Materials and supplies |  |  |  |  | (3,938) | $ (6,439) |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 12,200 |  | 12,200 |  |  |  |
Texas-New Mexico Power Company | Equipment |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | $ 700 |  | 700 |  |  |  |
Palo Verde Nuclear Generating Station, Unit 1 and 4 Leases | Public Service Company of New Mexico |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Number of leases, expiring | lease |  |  |  |  |  |  |  |  | 4
Number of leases under which lease term was extended | lease |  |  |  |  |  |  |  |  | 4
Palo Verde Nuclear Generating Station, Unit 2 Leases | Public Service Company of New Mexico |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Number of leases, expiring | lease |  |  |  |  |  |  |  | 4 |
Number of leases under which lease term was extended | lease |  |  |  |  |  |  |  | 1 |
Navajo Nation | Public Service Company of New Mexico |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |
Annual lease payments |  |  |  |  | $ 6,000 |  |  |  |
Right-of-way lease payments | $ 8,800 |  |  |  |  |  |  |  |

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