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Summary of the Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]  
Schedule of Average Straight-Line Rates and Depreciation on Electric, Common, Intangible, and General Plant
Average straight-line rates used were as follows:

Year ended December 31,
202420232022
PNM
Electric plant2.87 %2.67 %2.55 %
Common, intangible, and general plant14.06 7.64 7.83 
TNMP3.74 3.77 3.72 
Depreciation expense on electric, common, intangible, and general plant is as follows:

Year ended December 31,
202420232022
(In thousands)
PNM$188,035 $158,956 $163,162 
TNMP124,976 110,675 96,131 
Schedule of Inventory Inventories consisted of the following at December 31:
 
TXNM
PNMTNMP
 202420232024202320242023
 (In thousands)
Fuel Oil
$1,095 $896 $1,095 $896 $— $— 
Materials and supplies165,766 97,138 141,415 80,676 24,351 16,462 
$166,861 $98,034 $142,510 $81,572 $24,351 $16,462