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Financing - Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Instrument [Line Items] |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 3,932 | $ 156
Total | 4,525,743 | 4,077,543
Principal, less current maturities | 280,529 | 185,000
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 360 | 207
Long-term debt, excluding current maturities, gross | 4,245,214 | 3,892,543
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | 3,572 | (51)
PNM |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 10,765 | 8,445
Total | 2,272,545 | 2,009,345
Principal, less current maturities | 200,529 | 185,000
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 307 | 207
Long-term debt, excluding current maturities, gross | 2,072,016 | 1,824,345
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | 10,458 | 8,238
PNM | Senior Secured Notes, Energy Transition Bonds | Series A-1, 5.64% |  |
Debt Instrument [Line Items] |  |
Secured long-term debt, noncurrent | 175,000 | 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 1,093 | 0
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | Series A-1, 5.64% |  |
Debt Instrument [Line Items] |  |
Stated percentage | 5.64% |
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | Series A-2, 6.03% |  |
Debt Instrument [Line Items] |  |
Secured long-term debt, noncurrent | $ 168,200 | 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 1,057 | 0
Stated percentage | 6.03% |
PNM | 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
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 824 | 915
Stated percentage | 2.15% |
PNM | 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 | 37,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 88 | 296
Stated percentage | 3.00% |
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 0.875% mandatory tender - October 1, 2026 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 100,345 | 100,345
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 403 | 550
Stated percentage | 0.875% |
PNM | 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 | 36,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 87 | 288
Stated percentage | 3.00% |
PNM | 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 | $ 0 | 130,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 0 | 178
Stated percentage | 1.10% |
PNM | 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
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 132 | 383
Stated percentage | 1.15% |
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.90% due June 2040, mandatory tender - June 1, 2028 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 130,000 | 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 1,029 | 0
Stated percentage | 3.90% |
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.59% due July 2033 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 2.59% |
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.14% due July 2041 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 3.14% |
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.29% due December 2031 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 2.29% |
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.97% due December 2041 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 2.97% |
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.51% due April 2035 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 5.51% |
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.92% due April 2053 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 5.92% |
PNM | Senior Unsecured Notes: | 3.15% due May 2023 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 0 | 55,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 0 | 29
Stated percentage | 3.15% |
PNM | Senior Unsecured Notes: | 3.45% due May 2025 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 104,000 | 104,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 143 | 248
Stated percentage | 3.45% |
PNM | Senior Unsecured Notes: | 3.85% due August 2025 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 250,000 | 250,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 477 | 775
Stated percentage | 3.85% |
PNM | Senior Unsecured Notes: | 3.68% due May 2028 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 88,000 | 88,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 271 | 333
Stated percentage | 3.68% |
PNM | Senior Unsecured Notes: | 3.78% due August 2028 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 15,000 | 15,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 48 | 59
Stated percentage | 3.78% |
PNM | Senior Unsecured Notes: | 3.93% due May 2033 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 38,000 | 38,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 167 | 185
Stated percentage | 3.93% |
PNM | Senior Unsecured Notes: | 4.22% due May 2038 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 45,000 | 45,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 228 | 243
Stated percentage | 4.22% |
PNM | Senior Unsecured Notes: | 4.50% due May 2048 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 20,000 | 20,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 114 | 119
Stated percentage | 4.50% |
PNM | Senior Unsecured Notes: | 4.60% due August 2048 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 85,000 | 85,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 490 | 510
Stated percentage | 4.60% |
PNM | Senior Unsecured Notes: | 3.21% due April 2030 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 150,000 | 150,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 1,011 | 1,171
Stated percentage | 3.21% |
PNM | Senior Unsecured Notes: | 3.57% due April 2039 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 50,000 | 50,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 426 | 454
Stated percentage | 3.57% |
PNM | Senior Unsecured Notes: | 2.59% due July 2033 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 80,000 | 80,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 366 | 405
PNM | Senior Unsecured Notes: | 3.14% due July 2041 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 80,000 | 80,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 404 | 427
PNM | Senior Unsecured Notes: | 2.29% due December 2031 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 50,000 | 50,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 235 | 264
PNM | Senior Unsecured Notes: | 2.97% due December 2041 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 100,000 | 100,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 528 | 557
PNM | Senior Unsecured Notes: | 5.51% due April 2035 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 150,000 | 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 854 | 0
PNM | Senior Unsecured Notes: | 5.92% due April 2053 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 50,000 | 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 290 | 0
PNM | Senior Unsecured Notes: | PNM 2022 $225.0 Million Term Loan due February 2024 |  |
Debt Instrument [Line Items] |  |
Term loans | 0 | 225,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 0 | 56
TNMP |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | (7,682) | (8,677)
Total | 1,253,198 | 1,068,198
Principal, less current maturities | 80,000 | 0
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities | 53 | 0
Long-term debt, excluding current maturities, gross | 1,173,198 | 1,068,198
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | (7,735) | (8,677)
TNMP | First Mortgage Bonds: | 6.95% due April 2043 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | 93,198 | 93,198
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ (13,771) | (14,488)
Stated percentage | 6.95% |
TNMP | First Mortgage Bonds: | 4.03% due July 2024 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 80,000 | 80,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 53 | 158
Stated percentage | 4.03% |
TNMP | First Mortgage Bonds: | 3.53% due February 2026 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 60,000 | 60,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 174 | 256
Stated percentage | 3.53% |
TNMP | First Mortgage Bonds: | 3.22% due August 2027 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 60,000 | 60,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 209 | 266
Stated percentage | 3.22% |
TNMP | First Mortgage Bonds: | 3.85% due June 2028 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 60,000 | 60,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 281 | 344
Stated percentage | 3.85% |
TNMP | First Mortgage Bonds: | 3.79% due March 2034 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 75,000 | 75,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 385 | 422
Stated percentage | 3.79% |
TNMP | First Mortgage Bonds: | 3.92% due March 2039 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 75,000 | 75,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 429 | 457
Stated percentage | 3.92% |
TNMP | First Mortgage Bonds: | 4.06% due March 2044 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 75,000 | 75,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 456 | 479
Stated percentage | 4.06% |
TNMP | First Mortgage Bonds: | 3.60% due July 2029 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 80,000 | 80,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 330 | 391
Stated percentage | 3.60% |
TNMP | First Mortgage Bonds: | 2.73% due April 2030 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 85,000 | 85,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 530 | 616
Stated percentage | 2.73% |
TNMP | First Mortgage Bonds: | 3.36% due April 2050 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 25,000 | 25,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 218 | 226
Stated percentage | 3.36% |
TNMP | First Mortgage Bonds: | 2.93% due July 2035 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 25,000 | 25,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 191 | 208
Stated percentage | 2.93% |
TNMP | First Mortgage Bonds: | 3.36% due July 2050 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 50,000 | 50,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 441 | 457
Stated percentage | 3.36% |
TNMP | First Mortgage Bonds: | 2.44% due August 2035 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 65,000 | 65,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 418 | 454
Stated percentage | 2.44% |
TNMP | First Mortgage Bonds: | 4.13% due May 2052 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 65,000 | 65,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 424 | 439
Stated percentage | 4.13% |
TNMP | First Mortgage Bonds: | 3.81% due July 2032 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 95,000 | 95,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 572 | 638
Stated percentage | 3.81% |
TNMP | First Mortgage Bonds: | 5.01% due April 2033 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 130,000 | 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 682 | 0
Stated percentage | 5.01% |
TNMP | First Mortgage Bonds: | 5.47% due July 2053 |  |
Debt Instrument [Line Items] |  |
Unsecured long-term debt, noncurrent | $ 55,000 | 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 296 | 0
Stated percentage | 5.47% |
PNMR |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 849 | 388
Total | 1,000,000 | 1,000,000
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 | 1,000,000
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities | 849 | 388
PNMR | PNMR 2021 Delayed-Draw Term Loan due May 2025 |  |
Debt Instrument [Line Items] |  |
Term loans | 500,000 | 1,000,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 114 | 388
PNMR | PNMR 2023 Term Loan due June 2026 |  |
Debt Instrument [Line Items] |  |
Term loans | 500,000 | 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 735 | $ 0

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