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Electric Operating Revenues - Changes in contract liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Change In Contract With Customer Liability [Roll Forward]
Beginning balance	$ 349
Consideration received in advance of service to be provided	5,499
Deferred revenue earned	(2,966)
Ending balance	2,882
PNM
Change In Contract With Customer Liability [Roll Forward]
Beginning balance	349
Consideration received in advance of service to be provided	3,987
Deferred revenue earned	(2,210)
Ending balance	2,126
TNMP
Change In Contract With Customer Liability [Roll Forward]
Beginning balance	0
Consideration received in advance of service to be provided	1,512
Deferred revenue earned	(756)
Ending balance	$ 756

X

- Definition

Change In Contract With Customer Liability [Roll Forward]

+ References

No definition available.

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- Definition

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+ References

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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