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Financing - Schedule of Long-Term Debt Outstanding and Unamortized (Premiums), Discounts, and Debt Issuance Costs (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 15,846 $ 3,932
Total 4,939,214 4,525,743
Principal, less current maturities 611,907 280,529
Unamortized discounts, (premiums), and issuance costs, net, less current maturities 304 360
Long-term debt, excluding current maturities, gross 4,327,307 4,245,214
Unamortized discounts, (premiums), and issuance costs, net, excluding current maturities 15,542 3,572
PNM    
Debt Instrument [Line Items]    
Unamortized Discounts, (Premiums), and Issuance Costs, net 10,424 10,765
Total 2,470,016 2,272,545
Principal, less current maturities 560,907 200,529
Unamortized discounts, (premiums), and issuance costs, net, less current maturities 270 307
Long-term debt, excluding current maturities, gross 1,909,109 2,072,016
Unamortized discounts, (premiums), and issuance costs, net, excluding current maturities 10,154 10,458
PNM | Senior Secured Notes, Energy Transition Bonds | Series A-1, 5.64%    
Debt Instrument [Line Items]    
Secured long-term debt, noncurrent 172,471 175,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 1,025 1,093
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | Series A-1, 5.64%    
Debt Instrument [Line Items]    
Stated percentage (as a percent) 5.64%  
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | Series A-2, 6.03%    
Debt Instrument [Line Items]    
Secured long-term debt, noncurrent $ 168,200 168,200
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 1,014 1,057
Stated percentage (as a percent) 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
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 736 824
Stated percentage (as a percent) 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 $ 0 37,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 0 88
Stated percentage (as a percent) 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
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 257 403
Stated percentage (as a percent) 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 $ 0 36,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 0 87
Stated percentage (as a percent) 3.00%  
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 $ 0 125,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 0 132
Stated percentage (as a percent) 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 $ 130,000 130,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 796 1,029
Stated percentage (as a percent) 3.90%  
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.875% due June 2040, mandatory tender - June 1, 2029    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 162,000 0
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 1,158 0
Stated percentage (as a percent) 3.875%  
PNM | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.875% due January 2038, mandatory tender - June 1, 2029    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 36,000 0
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 258 0
Stated percentage (as a percent) 3.875%  
PNM | 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 $ 39 143
Stated percentage (as a percent) 3.45%  
PNM | 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 $ 174 477
Stated percentage (as a percent) 3.85%  
PNM | 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 $ 209 271
Stated percentage (as a percent) 3.68%  
PNM | 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 $ 38 48
Stated percentage (as a percent) 3.78%  
PNM | 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 $ 149 167
Stated percentage (as a percent) 3.93%  
PNM | 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 $ 212 228
Stated percentage (as a percent) 4.22%  
PNM | 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 $ 110 114
Stated percentage (as a percent) 4.50%  
PNM | 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 $ 470 490
Stated percentage (as a percent) 4.60%  
PNM | 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 $ 852 1,011
Stated percentage (as a percent) 3.21%  
PNM | 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 $ 398 426
Stated percentage (as a percent) 3.57%  
PNM | 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 $ 328 366
Stated percentage (as a percent) 2.59%  
PNM | 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 $ 381 404
Stated percentage (as a percent) 3.14%  
PNM | 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 $ 205 235
Stated percentage (as a percent) 2.29%  
PNM | 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 $ 499 528
Stated percentage (as a percent) 2.97%  
PNM | Senior Unsecured Notes: | 5.51% due April 2035    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 150,000 150,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 779 854
Stated percentage (as a percent) 5.51%  
PNM | Senior Unsecured Notes: | 5.92% due April 2053    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 50,000 50,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 280 290
Stated percentage (as a percent) 5.92%  
PNM | Senior Unsecured Notes: | PNM 2024 $200.0 Million Term Loan due November 2025    
Debt Instrument [Line Items]    
Term loans $ 200,000 0
Unamortized Discounts, (Premiums), and Issuance Costs, net 57 0
TNMP    
Debt Instrument [Line Items]    
Unamortized Discounts, (Premiums), and Issuance Costs, net (5,881) (7,682)
Total 1,458,198 1,253,198
Principal, less current maturities 0 80,000
Unamortized discounts, (premiums), and issuance costs, net, less current maturities 0 53
Long-term debt, excluding current maturities, gross 1,458,198 1,173,198
Unamortized discounts, (premiums), and issuance costs, net, excluding current maturities (5,881) (7,735)
TNMP | 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 $ (13,056) (13,771)
Stated percentage (as a percent) 6.95%  
TNMP | First Mortgage Bonds: | 4.03% due July 2024    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 0 80,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 0 53
Stated percentage (as a percent) 4.03%  
TNMP | 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 $ 91 174
Stated percentage (as a percent) 3.53%  
TNMP | 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 $ 152 209
Stated percentage (as a percent) 3.22%  
TNMP | 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 $ 219 281
Stated percentage (as a percent) 3.85%  
TNMP | 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 $ 347 385
Stated percentage (as a percent) 3.79%  
TNMP | 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 $ 401 429
Stated percentage (as a percent) 3.92%  
TNMP | 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 $ 433 456
Stated percentage (as a percent) 4.06%  
TNMP | 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 $ 270 330
Stated percentage (as a percent) 3.60%  
TNMP | 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 $ 445 530
Stated percentage (as a percent) 2.73%  
TNMP | 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 $ 210 218
Stated percentage (as a percent) 3.36%  
TNMP | 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 $ 175 191
Stated percentage (as a percent) 2.93%  
TNMP | 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 $ 424 441
Stated percentage (as a percent) 3.36%  
TNMP | 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 $ 382 418
Stated percentage (as a percent) 2.44%  
TNMP | First Mortgage Bonds: | 4.13% due May 2052    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 65,000 65,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 409 424
Stated percentage (as a percent) 4.13%  
TNMP | First Mortgage Bonds: | 3.81% due July 2032    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 95,000 95,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 505 572
Stated percentage (as a percent) 3.81%  
TNMP | First Mortgage Bonds: | 5.01% due April 2033    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 130,000 130,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 610 682
Stated percentage (as a percent) 5.01%  
TNMP | First Mortgage Bonds: | 5.47% due July 2053    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 55,000 55,000
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 286 296
Stated percentage (as a percent) 5.47%  
TNMP | First Mortgage Bonds: | 5.26% due March 2029    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 32,000 0
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 189 0
Stated percentage (as a percent) 5.26%  
TNMP | First Mortgage Bonds: | 5.55% due March 2036    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 85,000 0
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 538 0
Stated percentage (as a percent) 5.55%  
TNMP | First Mortgage Bonds: | 5.65% due July 2039    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 40,000 0
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 256 0
Stated percentage (as a percent) 5.65%  
TNMP | First Mortgage Bonds: | 5.79% due July 2054    
Debt Instrument [Line Items]    
Unsecured long-term debt, noncurrent $ 128,000 0
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 833 0
Stated percentage (as a percent) 5.79%  
TXNM    
Debt Instrument [Line Items]    
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 11,303 849
Total 1,011,000 1,000,000
Principal, less current maturities 51,000 0
Unamortized discounts, (premiums), and issuance costs, net, less current maturities 34 0
Long-term debt, excluding current maturities, gross 960,000 1,000,000
Unamortized discounts, (premiums), and issuance costs, net, excluding current maturities 11,269 849
TXNM | TXNM 2021 Delayed-Draw Term Loan due May 2025    
Debt Instrument [Line Items]    
Term loans 51,000 500,000
Unamortized Discounts, (Premiums), and Issuance Costs, net 34 114
TXNM | TXNM 2023 Term Loan due June 2026    
Debt Instrument [Line Items]    
Term loans 410,000 500,000
Unamortized Discounts, (Premiums), and Issuance Costs, net 441 735
TXNM | 5.75% TXNM Junior Subordinated Convertible Notes due June 2054    
Debt Instrument [Line Items]    
Term loans 550,000 0
Unamortized Discounts, (Premiums), and Issuance Costs, net $ 10,828 $ 0
Stated percentage (as a percent) 5.75%