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Financing - Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
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