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Summary of the Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Schedule of Average Rates Used Allocated Between Depreciation Expense and Construction Expense Projects Based on Use of Equipment
Average straight-line rates used were as follows:

Year ended December 31,
202320222021
PNM
Electric plant2.67 %2.55 %2.48 %
Common, intangible, and general plant7.64 7.83 7.91 
TNMP3.77 3.72 3.88 

Depreciation on electric, common, intangible, and general plant is as follows:

Year ended December 31,
202320222021
(In thousands)
PNM$158,956 $163,162 $153,165 
TNMP110,675 96,131 87,900 
Schedule of Inventory Inventories consisted of the following at December 31:
 PNMRPNMTNMP
 202320222023202220232022
 (In thousands)
Fuel Oil
$896 $985 $896 $985 $— $— 
Materials and supplies97,138 65,748 80,676 54,905 16,462 10,843 
$98,034 $66,733 $81,572 $55,890 $16,462 $10,843