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Lease Commitments - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2023 USD ($) | Jan. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) batteryStorageAgreement MW | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) MW | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Nov. 18, 2022 lease | Apr. 02, 2021 lease | Jan. 15, 2016 lease | Jan. 15, 2015 lease
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of productive assets |  |  |  |  | $ 32,654 | $ 0 |  |  |  |  |
Reduction to inventories |  |  |  |  | 16,657 | 6,630 |  |  |  |  |
Operating lease, payments to lessor upon occurrence of certain events |  |  | $ 13,500 |  | 13,500 |  |  |  |  |  |
Unamortized cost, right-of-way lease payments |  |  | 56,700 |  | 56,700 |  | $ 54,600 |  |  |  |
Operating lease, right-of-use asset, amortization expense |  |  | 800 | $ 900 | 2,600 | 2,900 |  |  |  |  |
Operating lease, right-of-use asset |  |  | 185,989 |  | 185,989 |  | 55,982 |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 25,900 |  | 25,900 |  |  |  |  |  |
Lease to be executed, fixed consideration |  |  | $ 961,000 |  | $ 961,000 |  |  |  |  |  |
Lease to be executed, term of contract |  |  | 20 years |  | 20 years |  |  |  |  |  |
Materials, Supplies, and Fuel Stock |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction to inventories |  |  |  |  | $ (5,300) |  |  |  |  |  |
PNM |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of leases under which lease term was extended | lease |  |  |  |  |  |  |  | 5 | 5 |  |
Proceeds from sale of productive assets |  |  |  |  | 32,654 | 0 |  |  |  |  |
Reduction to inventories |  |  |  |  | 12,300 | 3,809 |  |  |  |  |
Operating lease, right-of-use asset |  |  | $ 183,889 |  | 183,889 |  | 52,556 |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 13,200 |  | 13,200 |  |  |  |  |  |
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 |
Annual lease payments during renewal period |  |  |  |  | 1,600 |  |  |  |  |  |
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 |  |  |  |  | 4,357 | $ 2,821 |  |  |  |  |
Operating lease, right-of-use asset |  |  | 2,099 |  | 2,099 |  | $ 3,426 |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 12,700 |  | 12,700 |  |  |  |  |  |
Equipment |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | 1,900 |  | 1,900 |  |  |  |  |  |
Equipment | PNM |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | 900 |  | 900 |  |  |  |  |  |
Equipment | TNMP |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | $ 1,000 |  | 1,000 |  |  |  |  |  |
PNM Owned Assets |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of productive assets |  | $ 33,700 |  |  |  |  |  |  |  |  |
Net Utility Plant |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of productive assets |  |  |  |  | $ 28,400 |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of battery storage agreements | batteryStorageAgreement |  |  | 2 |  |  |  |  |  |  |  |
Operating lease, term of contract |  |  | 20 years |  | 20 years |  |  |  |  |  |
Operating lease, right-of-use asset |  |  | $ 138,700 |  | $ 138,700 |  |  |  |  |  |
Other | PNM |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of megawatts in battery storage facilities (in megawatts) | MW |  |  | 170 |  | 170 |  |  |  |  |  |

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