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Related Party Transactions
 9 Months Ended
Sep. 30, 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 EndedNine Months Ended
September 30,September 30,
2025202420252024
(In thousands)
Services billings:
TXNM to PNM
$30,866 $33,095 $98,270 $99,525 
TXNM to TNMP
12,136 13,192 39,621 40,314 
PNM to TNMP82 178 247 368 
TNMP to TXNM
22 75 78 85 
TNMP to PNM
— 497 — 497 
TXNM to NMRD
— — — 66 
Renewable energy purchases:
PNM from NMRD— — — 1,523 
Interest billings:
TXNM to PNM
49 77 133 116 
PNM to TXNM
133 156 398 465 
TXNM to TNMP
24 23 210 202