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Related Party Transactions
 3 Months Ended
Mar. 31, 2020
Related Party Transactions [Abstract]  
Related Party Transactions Related Party TransactionsPNMR, PNM, TNMP, and NMRD are considered related parties as defined under GAAP, 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. 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. See Note 16 for additional discussion of NMRD.
The table below summarizes the nature and amount of related party transactions of PNMR, PNM, TNMP, and NMRD:

Three Months Ended
March 31,
20202019
(In thousands)
Services billings:
PNMR to PNM$22,123  $26,826  
PNMR to TNMP8,727  10,058  
PNM to TNMP76  75  
TNMP to PNMR35  35  
PNMR to NMRD76  41  
Renewable energy purchases:
PNM from NMRD1,519  625  
Interconnection billings:
PNM to NMRD220  —  
PNM to PNMR—  —  
Interest billings:
PNMR to PNM—  933  
PNM to PNMR81  72  
PNMR to TNMP1  32  
Income tax sharing payments:
PNMR to PNM—  —  
TNMP to PNMR—  —