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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction [Line Items]
Ownership	50.00%		50.00%
Services billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 23,617	$ 24,204	$ 75,992	$ 70,848
Services billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	9,187	9,645	29,687	28,075
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	107	106	319	295
Services billings: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	0	35	24	106
Services billings: | PNMR to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	55	74	165	199
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	3,384	3,723	9,473	7,646
Interconnection billings: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	225	0	225	350
Interconnection billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0	0
Interconnection billings: | NMRD to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	1,276	0
Interest billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0	6
Interest billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0	2
Interest billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	36	60	108	218
Income tax sharing payments: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0	0
Income tax sharing payments: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	$ 0	$ 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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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

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- Definition

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+ References

No definition available.

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