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Related Party Transactions
 12 Months Ended
Dec. 31, 2023
Related Party Transactions [Abstract]  
Related Party Transactions Related Party Transactions
PNMR, PNM, TNMP, and NMRD are considered related parties, as is PNMR Services Company, a wholly-owned subsidiary of PNMR that provides corporate services to PNMR 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, PNMR provides construction and operations and maintenance services to NMRD, a 50% owned subsidiary of PNMR Development (Note 21), and PNM purchases renewable energy from certain NMRD-owned facilities at a fixed price per MWh of energy produced. PNM also provides interconnection services to PNMR Development and NMRD.

PNMR files a consolidated federal income tax return with its affiliated companies. A tax allocation agreement exists between PNMR and each of its affiliated companies. These agreements provide that the subsidiary company will compute its taxable income on a stand-alone basis. If the result is a net tax liability, such amount shall be paid to PNMR. If there are net operating losses and/or tax credits, the subsidiary shall receive payment for the tax savings from PNMR to the extent that PNMR is able to utilize those benefits.
 
See Note 7 for information on intercompany borrowing arrangements. The table below summarizes the nature and amount of related party transactions of PNMR, PNM and TNMP:     
 Year Ended December 31,
 202320222021
(In thousands)
Services billings:
PNMR to PNM$124,321 $115,415 $107,747 
PNMR to TNMP47,470 42,293 41,798 
PNM to TNMP349 411 404 
TNMP to PNMR141 141 141 
PNMR to NMRD333 308 221 
Renewable energy purchases:
PNM from NMRD12,717 11,795 11,879 
Interconnection and facility study billings:
PNM to NMRD— — 225 
NMRD to PNM— — 1,276 
Interest billings:
PNMR to PNM23 13 31 
PNM to PNMR582 249 144 
PNMR to TNMP129 166 — 
Income tax sharing payments:
PNMR to PNM5,338 — 19,492 
PNM to PNMR— 11,602 — 
TNMP to PNMR15,749 8,341 12,842