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Lease Commitments - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) | Apr. 30, 2023 USD ($) | Jan. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 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 |  |  |  | 6,457 | (2,443) |  |  |
Unamortized cost, right-of-way lease payments |  |  |  | 71,300 |  | $ 56,200 |  |
Operating lease, right-of-use asset, amortization expense |  |  |  | $ 1,100 | 900 |  |  |
Non-lease component, percent of lease liability |  |  |  | 25.50% |  |  |  |
Operating lease, right-of-use asset |  |  |  | $ 179,480 |  | 182,201 |  |
Lessee, operating lease, unguaranteed residual value |  |  |  | 23,800 |  |  |  |
Lease to be executed, fixed consideration |  |  |  | $ 1,100,000 |  |  |  |
Lease to be executed, term of contract |  |  |  | 20 years |  |  |  |
Materials, Supplies, and Fuel Stock |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Reduction to inventories | $ (600) |  |  | $ (5,300) |  |  |  |
PNM |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of productive assets |  |  |  | 2,840 | 28,372 |  |  |
Reduction to inventories |  |  |  | 3,612 | (2,916) |  |  |
Operating lease, right-of-use asset |  |  |  | 177,865 |  | 180,370 |  |
Lessee, operating lease, unguaranteed residual value |  |  |  | 11,900 |  |  |  |
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 |  | $ 8,300 |  |  |  |  |  |
TNMP |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Reduction to inventories |  |  |  | 2,845 | $ 473 |  |  |
Operating lease, right-of-use asset |  |  |  | 1,615 |  | $ 1,814 |  |
Lessee, operating lease, unguaranteed residual value |  |  |  | 12,000 |  |  |  |
Equipment |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  |  | 1,800 |  |  |  |
Equipment | PNM |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  |  | 800 |  |  |  |
Equipment | TNMP |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  |  | 1,000 |  |  |  |
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 |  |  |  |
Other |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease, term of contract |  |  |  | 20 years |  |  |  |

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