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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 |  |  |  |

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