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Lease Commitments - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2023 batteryStorageAgreement | Sep. 29, 2022 USD ($) | Jan. 31, 2024 USD ($) | Jan. 31, 2023 USD ($) | Sep. 30, 2023 batteryStorageAgreement MW | Dec. 31, 2022 USD ($) batteryStorageAgreement | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Apr. 02, 2021 lease | Jan. 15, 2016 lease | Jan. 15, 2015 lease
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Inventories |  | $ 6,430 |  |  |  |  | $ (31,301) | $ (8,528) | $ 1,356 |  |  |
Unamortized cost of prepaid right-of-way agreements |  |  |  |  |  | $ 54,600 | 56,200 | 54,600 |  |  |  |
Amortization of prepaid right-of-way agreements |  |  |  |  |  |  | 3,500 | 3,800 | 3,700 |  |  |
Operating lease assets, net of amortization |  |  |  |  |  | $ 55,982 | $ 182,201 | 55,982 |  |  |  |
Non-lease component, percent of lease liability |  |  |  |  |  |  | 25.50% |  |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  |  |  |  |  | $ 24,900 |  |  |  |  |
Lease not yet commenced, expected fixed consideration |  |  |  |  |  |  | $ 961,000 |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Number of leases under which lease term was extended | lease |  |  |  |  |  |  |  |  |  | 5 |  |
Decrease in Inventories |  |  |  |  |  |  | $ (25,681) | (4,804) | 2,531 |  |  |
Number of battery storage agreements | batteryStorageAgreement | 3 |  |  |  |  | 2 |  |  |  |  |  |
Operating lease assets, net of amortization |  |  |  |  |  | $ 52,556 | 180,370 | 52,556 |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  |  |  |  |  | 12,600 |  |  |  |  |
TNMP |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Inventories |  |  |  |  |  |  | (5,620) | (3,723) | $ (1,175) |  |  |
Operating lease assets, net of amortization |  |  |  |  |  | $ 3,426 | 1,814 | $ 3,426 |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  |  |  |  |  | 12,300 |  |  |  |  |
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 |
Annual lease payments during renewal period |  |  |  |  |  |  | 800 |  |  |  |  |
Navajo Nation | PNM |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Right-of-way lease, annual payments |  |  |  |  |  |  | 6,000 |  |  |  |  |
Right-of-way lease, payments |  |  |  |  |  |  | 8,300 |  |  |  |  |
PNM Owned Assets |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  | 33,700 |  |  |  |  |  |  |  |
PNM Owned Assets | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets |  |  | $ 3,500 |  |  |  |  |  |  |  |  |
Net Utility Plant |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  | $ 28,400 |  |  |  |  |  |  |  |
Nuclear Fuel | Net Utility Plant | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets |  |  | 3,000 |  |  |  |  |  |  |  |  |
Nuclear Fuel | Materials and supplies | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets |  |  | $ 500 |  |  |  |  |  |  |  |  |
Equipment |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  |  |  |  |  | 1,800 |  |  |  |  |
Equipment | PNM |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  |  |  |  |  | 800 |  |  |  |  |
Equipment | TNMP |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  |  |  |  |  | 1,000 |  |  |  |  |
Battery Storage |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of battery storage agreements | batteryStorageAgreement |  |  |  |  | 2 |  |  |  |  |  |  |
Term of lease |  |  |  |  | 20 years |  |  |  |  |  |  |
Operating lease assets, net of amortization |  |  |  |  |  |  | $ 138,000 |  |  |  |  |
Battery Storage | PNM |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of megawatts in battery storage facilities (in megawatts) | MW |  |  |  |  | 170 |  |  |  |  |  |  |

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