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Lease Commitments - Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) | Jan. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) MW | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 15, 2016 lease | Jan. 15, 2015 lease
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Proceeds from sale of plant assets |  |  | $ 2,840 | $ 32,654 | $ 0 |  |
Decrease in inventories |  |  | (33,804) | (31,301) | (8,528) |  |
Unamortized cost of prepaid right-of-way agreements |  |  | 67,100 | 56,200 |  |  |
Amortization of prepaid right-of-way agreements |  |  | 4,300 | 3,500 | 3,800 |  |
Operating lease assets, net of amortization |  |  | $ 272,894 | 182,201 |  |  |
Non-lease component, percent of lease liability |  |  | 25.50% |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | $ 23,300 |  |  |  |
Lease not yet commenced, expected fixed consideration |  |  | $ 226,300 |  |  |  |
Lease not yet commenced, term |  |  | 20 years |  |  |  |
Materials, Supplies, and Fuel Stock |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Decrease in inventories |  | $ 5,300 |  |  |  |  |
PNM |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Proceeds from sale of plant assets |  |  | $ 2,840 | 32,654 | 0 |  |
Decrease in inventories |  |  | (25,915) | (25,681) | (4,804) |  |
Operating lease assets, net of amortization |  |  | 271,433 | 180,370 |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 12,700 |  |  |  |
TNMP |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Decrease in inventories |  |  | (7,889) | (5,620) | $ (3,723) |  |
Operating lease assets, net of amortization |  |  | 923 | $ 1,814 |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 10,400 |  |  |  |
Palo Verde Nuclear Generating Station, Units 1 and 4 | PNM |  |  |  |  |  |  |
Lessee, Lease, Description [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 | PNM |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of leases expiring | lease |  |  |  |  |  | 4 |
Number of leases under which lease term was extended | lease |  |  |  |  |  | 1 |
Navajo Nation | PNM |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Right-of-way lease, annual payments |  |  | 6,000 |  |  |  |
Right-of-way lease, payments |  |  | 8,600 |  |  |  |
PNM Owned Assets |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Proceeds from sale of plant assets | $ 3,400 | 33,700 |  |  |  |  |
Net Utility Plant |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Proceeds from sale of plant assets |  | $ 28,400 |  |  |  |  |
Nuclear Fuel | Net Utility Plant |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Proceeds from sale of plant assets | 2,800 |  |  |  |  |  |
Nuclear Fuel | Materials and supplies |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Proceeds from sale of plant assets | $ 600 |  |  |  |  |  |
Equipment |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | 1,600 |  |  |  |
Equipment | PNM |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | 700 |  |  |  |
Equipment | TNMP |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | 900 |  |  |  |
Energy Storage |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating lease assets, net of amortization |  |  | $ 101,500 |  |  |  |
Energy Storage | PNM |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of megawatts in battery storage facilities (in megawatts) | MW |  |  | 100 |  |  |  |

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