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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Related Party Transaction [Line Items]
Ownership percentage	50.00%		50.00%
Services billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 22,972	$ 23,451	$ 69,122	$ 71,044
Services billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	8,074	7,828	24,497	23,771
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	104	115	281	302
Services billings: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	35	35	105	106
Services billings: | TNMP to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	8	0	154
Services billings: | PNMR to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	32	0	162	0
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	969	0	2,343	0
Interconnection billings: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	47	0	2,099	0
Interconnection billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	68,200	0
Interest billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	844	3	1,653	14
Interest billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	65	66	87	126
Interest billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	75	71	211	163
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://fasb.org/us-gaap/role/ref/legacyRef
-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
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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