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Related Party Transactions
 3 Months Ended
Mar. 31, 2025
Related Party Transactions [Abstract]  
Related Party Transactions Related Party Transactions
TXNM, PNM, TNMP, and NMRD are considered related parties, as is PNMR Services Company, a wholly-owned subsidiary of TXNM that provides corporate services to TXNM and its subsidiaries in accordance with shared services agreements. These services are billed at cost on a monthly basis to the business units. In addition, prior to the sale of NMRD, PNM purchased renewable energy from certain NMRD-owned facilities at a fixed price per MWh of energy produced. On February 27, 2024, PNMR Development and AEP OnSite Partners sold their respective interests in NMRD and the table below reflects transactions with NMRD prior to the sale. The table below summarizes the nature and amount of related party transactions of TXNM, PNM, TNMP, and NMRD:
Three Months Ended
March 31,
20252024
(In thousands)
Services billings:
TXNM to PNM
$32,087 $35,407 
TXNM to TNMP
13,376 14,237 
PNM to TNMP79 81 
TNMP to TXNM
28 10 
TXNM to NMRD
— 66 
Renewable energy purchases:
PNM from NMRD— 1,523 
Interest billings:
TXNM to PNM
8 14 
PNM to TXNM
133 155 
TXNM to TNMP
145 14