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Condensed Consolidated Balance Sheets - TXNM - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Current Assets:            
Cash and cash equivalents $ 32,066   $ 4,498      
Accounts receivable, net of allowance for credit losses of $1,348 and $1,398 190,913   130,351      
Unbilled revenues 82,440   69,176      
Other receivables 42,256   37,236      
Materials, supplies, and fuel stock 172,986   166,861      
Regulatory assets 29,157   41,492      
Prepaid assets 30,721   25,452      
Income taxes receivable 8,642   7,684      
Other current assets 6,255   16,086      
Total current assets 595,436   498,836      
Other Property and Investments:            
Investment securities 493,895   475,524      
Other investments 268   259      
Non-utility property, net 36,678   28,832      
Total other property and investments 530,841   504,615      
Utility Plant:            
Plant in service and plant held for future use 11,109,319   10,697,774      
Less accumulated depreciation and amortization 2,966,615   2,829,296      
Net plant in service and plant held for future use 8,142,704   7,868,478      
Construction work in progress 791,841   495,976      
Nuclear fuel, net of accumulated amortization of $36,411 and $28,245 75,723   72,554      
Net utility plant 9,010,268   8,437,008      
Deferred Charges and Other Assets:            
Regulatory assets 953,075   962,003      
Goodwill 278,297   278,297 $ 278,297    
Operating lease right-of-use assets, net of accumulated amortization 320,127   272,894      
Other deferred charges 283,490   258,080      
Total deferred charges and other assets 1,834,989   1,771,274      
Total assets 11,971,534   11,211,733 10,843,481    
Current Liabilities:            
Short-term debt 313,800   609,300      
Current installments of long-term debt (includes $7,303 and $6,907 related to ETBC I) 402,311   611,603      
Accounts payable 154,416   204,468      
Customer deposits 6,688   6,533      
Accrued interest and taxes 134,484   104,756      
Regulatory liabilities 23,708   34,173      
Operating lease liabilities 15,366   14,293      
Dividends declared 43,074   36,889      
Transmission interconnection arrangement liabilities 0   68,085      
Other current liabilities 82,373   84,998      
Total current liabilities 1,176,220   1,775,098      
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs (includes $324,504 and $331,726 related to ETBC I) 4,680,365   4,311,765      
Deferred Credits and Other Liabilities:            
Accumulated deferred income taxes 945,750   899,392      
Regulatory liabilities 760,536   748,738      
Asset retirement obligations 248,461   244,618      
Accrued pension liability and postretirement benefit cost 15,696   23,065      
Operating lease liabilities 300,165   255,376      
Other deferred credits 371,467   358,867      
Total deferred credits and other liabilities 2,642,075   2,530,056      
Total liabilities 8,498,660   8,616,919      
Commitments and Contingencies (Note 11)        
Cumulative Preferred Stock of Subsidiary without mandatory redemption requirements ($100 stated value; 10,000,000 shares authorized; issued and outstanding 115,293 shares) 11,529   11,529      
TXNM common stockholders’ equity:            
Common stock (no par value; 200,000,000 shares authorized; issued and outstanding 108,921,356 and 92,659,335 shares) 2,565,578   1,724,444      
Accumulated other comprehensive income (loss), net of income taxes (73,754)   (75,708)      
Retained earnings 924,214   887,649      
Total TXNM common stockholders’ equity 3,416,038   2,536,385      
Non-controlling interest in Valencia 45,307   46,900      
Total equity 3,461,345 $ 3,216,794 2,583,285 $ 2,508,048 $ 2,451,680 $ 2,399,051
Total liabilities and stockholders' equity $ 11,971,534   $ 11,211,733