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Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Ownership percentage	50.00%
Services billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 107,747	$ 100,872	$ 96,327
Services billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	41,798	39,053	36,554
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	404	383	375
Services billings: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	141	141	141
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	221	260	238
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	11,879	9,638	3,124
Interconnection and facility study billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	68,820
Interconnection and facility study billings: | PNM to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	225	350	650
Interconnection and facility study billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0
Interconnection and facility study billings: | NMRD to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	1,276	0	0
Interest billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	31	6	3,365
Interest billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	0	2	42
Interest billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	144	255	299
Income tax sharing payments: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	19,492	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	12,842	15,820	12,996
Income tax sharing payments: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	$ 0	$ 0	$ 0

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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- 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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