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Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Ownership percentage	50.00%
Services billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 96,327	$ 95,637	$ 97,914
Services billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	36,554	33,493	31,095
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	375	367	382
Services billings: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	141	140	141
Services billings: | TNMP to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	154
Services billings: | PNMR to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	238	183	0
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	3,124	2,924	0
Interconnection and facility study billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	68,820	0	0
Interconnection and facility study billings: | PNM to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	650	2,108	0
Interconnection and facility study billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	0	68,820	0
Interest billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	3,365	2,585	21
Interest billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	42	136	133
Interest billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	299	289	220
Income tax sharing payments: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	23,391
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	12,996	3,424	20,686
Income tax sharing payments: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	$ 0	$ 134	$ 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
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-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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
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- Definition

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+ References

No definition available.

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