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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