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Financing - Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 156 | $ 124
Total | 4,077,543 | 3,699,043
Principal, less current maturities | 185,000 | 179,500
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 207 | 161
Long-term debt, excluding current maturities, gross | 3,892,543 | 3,519,543
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | (51) | (37)
Public Service Company of New Mexico |  |
Debt Instrument [Line Items] |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | 8,445 | 9,735
Total | 2,009,345 | 1,890,845
Principal, less current maturities | 185,000 | 179,500
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 207 | 161
Long-term debt, excluding current maturities, gross | 1,824,345 | 1,711,345
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | 8,238 | 9,574
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.15% due April 2033 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 146,000 | 146,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 915 | 1,003
Stated percentage | 2.15% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.125% due June 2040, mandatory tender - June 1, 2022 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 0 | 37,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 0 | 45
Stated percentage | 2.125% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.00% due June 2040, mandatory tender - June 1, 2024 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 37,000 | 0
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 296 | 0
Stated percentage | 3.00% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.45% due September 2042, mandatory tender - June 1, 2022 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 0 | 20,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 0 | 17
Stated percentage | 2.45% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 0.875% due October 2026 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 100,345 | 100,345
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 550 | 697
Stated percentage | 0.875% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.05% due January 2038, mandatory tender - June 1, 2022 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 0 | 36,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 0 | 75
Stated percentage | 1.05% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.00% due January 2038, mandatory tender - June 1, 2024 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 36,000 | 0
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 288 | 0
Stated percentage | 3.00% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.20% due June 2040, mandatory tender - June 1, 2022 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 0 | 11,500
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 0 | 24
Stated percentage | 1.20% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.10% due June 2040, mandatory tender June 1, 2023 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 130,000 | 130,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 178 | 535
Stated percentage | 1.10% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.15% due June 2040, mandatory tender - June 1, 2024 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 125,000 | 125,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 383 | 639
Stated percentage | 1.15% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.59% due July 2033 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 2.59% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.14% due July 2041 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 3.14% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.29% due December 2031 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 2.29% |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.97% due December 2041 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 2.97% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.15% due May 2023 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 55,000 | 55,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 29 | 106
Stated percentage | 3.15% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.45% due May 2025 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 104,000 | 104,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 248 | 353
Stated percentage | 3.45% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.85% due August 2025 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 250,000 | 250,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 775 | 1,075
Stated percentage | 3.85% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.68% due May 2028 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 88,000 | 88,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 333 | 395
Stated percentage | 3.68% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.78% due August 2028 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 15,000 | 15,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 59 | 69
Stated percentage | 3.78% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.93% due May 2033 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 38,000 | 38,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 185 | 203
Stated percentage | 3.93% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.22% due May 2038 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 45,000 | 45,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 243 | 259
Stated percentage | 4.22% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.50% due May 2048 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 20,000 | 20,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 119 | 124
Stated percentage | 4.50% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.60% due August 2048 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 85,000 | 85,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 510 | 530
Stated percentage | 4.60% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.21% due April 2030 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 150,000 | 150,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 1,171 | 1,331
Stated percentage | 3.21% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.57% due April 2039 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 50,000 | 50,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 454 | 482
Stated percentage | 3.57% |
Public Service Company of New Mexico | Senior Unsecured Notes: | 2.59% due July 2033 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 80,000 | 80,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | 405 | 443
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.14% due July 2041 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 80,000 | 80,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | 427 | 450
Public Service Company of New Mexico | Senior Unsecured Notes: | 2.29% due December 2031 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 50,000 | 50,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | 264 | 293
Public Service Company of New Mexico | Senior Unsecured Notes: | 2.97% due December 2041 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 100,000 | 100,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | 557 | 587
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2021 $75.0 Million Term Loan due December 2022 |  |
Debt Instrument [Line Items] |  |
Term loans | 0 | 75,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | 0 | 0
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2022 225.0 Million Term Loan due February 2024 |  |
Debt Instrument [Line Items] |  |
Term loans | 225,000 | 0
Unamortized Discounts, (Premiums), and Issuance Costs, net | 56 | 0
Texas-New Mexico Power Company |  |
Debt Instrument [Line Items] |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | (8,677) | (9,852)
Total | 1,068,198 | 908,198
Principal, less current maturities | 0 | 0
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 0 | 0
Long-term debt, excluding current maturities, gross | 1,068,198 | 908,198
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | (8,677) | (9,852)
Texas-New Mexico Power Company | First Mortgage Bonds: | 6.95% due April 2043 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 93,198 | 93,198
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ (14,488) | (15,202)
Stated percentage | 6.95% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.03% due July 2024 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 80,000 | 80,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 158 | 264
Stated percentage | 4.03% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.53% due February 2026 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 60,000 | 60,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 256 | 338
Stated percentage | 3.53% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.22% due August 2027 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 60,000 | 60,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 266 | 324
Stated percentage | 3.22% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.85% due June 2028 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 60,000 | 60,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 344 | 406
Stated percentage | 3.85% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.79% due March 2034 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 75,000 | 75,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 422 | 460
Stated percentage | 3.79% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.92% due March 2039 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 75,000 | 75,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 457 | 486
Stated percentage | 3.92% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.06% due March 2044 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 75,000 | 75,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 479 | 501
Stated percentage | 4.06% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.60% due July 2029 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 80,000 | 80,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 391 | 451
Stated percentage | 3.60% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 2.73% due April 2030 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 85,000 | 85,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 616 | 699
Stated percentage | 2.73% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.36% due April 2050 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 25,000 | 25,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 226 | 235
Stated percentage | 3.36% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 2.93% due July 2035 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 25,000 | 25,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 208 | 224
Stated percentage | 2.93% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.36% due July 2050 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 50,000 | 50,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 457 | 473
Stated percentage | 3.36% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 2.44% due August 2035 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 65,000 | 65,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 454 | 489
Stated percentage | 2.44% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.13% due May 12, 2052 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 65,000 | 0
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 439 | 0
Stated percentage | 4.13% |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.81% due July 28, 2032 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 95,000 | 0
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 638 | 0
Stated percentage | 3.81% |
PNMR |  |
Debt Instrument [Line Items] |  |
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 388 | 241
Total | 1,000,000 | 900,000
Principal, less current maturities | 0 | 0
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 0 | 0
Long-term debt, excluding current maturities, gross | 1,000,000 | 900,000
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | 388 | 241
PNMR | PNMR 2021 Delayed-Draw Term Loan due May 2025 |  |
Debt Instrument [Line Items] |  |
Term loans | 1,000,000 | 900,000
Unamortized Discounts, (Premiums), and Issuance Costs, net | $ 388 | $ 241

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