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Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Ownership percentage	50.00%
Services billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 100,872	$ 96,327	$ 95,637
Services billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	39,053	36,554	33,493
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	383	375	367
Services billings: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	141	141	140
Services billings: | TNMP to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0
Services billings: | PNMR to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	260	238	183
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	9,638	3,124	2,924
Interconnection and facility study billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	68,820	0
Interconnection and facility study billings: | PNM to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	350	650	2,108
Interconnection and facility study billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	68,820
Interest billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	6	3,365	2,585
Interest billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	2	42	136
Interest billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	255	299	289
Income tax sharing payments: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0
Income tax sharing payments: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0
Income tax sharing payments: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	15,820	12,996	3,424
Income tax sharing payments: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	$ 0	$ 0	$ 134

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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+ References

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