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Electric Operating Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Contracts with customers	$ 1,359,740	$ 1,321,023	$ 1,277,594
Operating Revenues	1,436,613	1,445,003	1,362,951
Residential Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	563,297
Commercial Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	519,594
Industrial Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	78,436
Public Authority Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	27,297
Economy Energy Service Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	26,764
Electric Transmission Revenue
Disaggregation of Revenue [Line Items]
Contracts with customers	121,271
Miscellaneous Revenue From Contracts With Customers
Disaggregation of Revenue [Line Items]
Contracts with customers	23,081
Alternative Energy
Disaggregation of Revenue [Line Items]
Operating Revenues	1,756	15,779	16,035
Other Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	75,117	108,201	69,322
Public Service Company of New Mexico
Disaggregation of Revenue [Line Items]
Contracts with customers	1,019,291	992,462	963,158
Operating Revenues	1,091,965	1,104,230	1,035,913
Public Service Company of New Mexico | Residential Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	433,009
Public Service Company of New Mexico | Commercial Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	408,333
Public Service Company of New Mexico | Industrial Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	61,119
Public Service Company of New Mexico | Public Authority Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	21,688
Public Service Company of New Mexico | Economy Energy Service Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	26,764
Public Service Company of New Mexico | Electric Transmission Revenue
Disaggregation of Revenue [Line Items]
Contracts with customers	54,280
Public Service Company of New Mexico | Miscellaneous Revenue From Contracts With Customers
Disaggregation of Revenue [Line Items]
Contracts with customers	14,098
Public Service Company of New Mexico | Alternative Energy
Disaggregation of Revenue [Line Items]
Operating Revenues	(2,443)	3,567	3,433
Public Service Company of New Mexico | Other Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	75,117	108,201	69,322
Texas-New Mexico Power Company
Disaggregation of Revenue [Line Items]
Contracts with customers	340,449	328,561	314,436
Operating Revenues	344,648	340,773	327,038
Texas-New Mexico Power Company | Residential Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	130,288
Texas-New Mexico Power Company | Commercial Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	111,261
Texas-New Mexico Power Company | Industrial Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	17,317
Texas-New Mexico Power Company | Public Authority Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	5,609
Texas-New Mexico Power Company | Economy Energy Service Electric
Disaggregation of Revenue [Line Items]
Contracts with customers	0
Texas-New Mexico Power Company | Electric Transmission Revenue
Disaggregation of Revenue [Line Items]
Contracts with customers	66,991
Texas-New Mexico Power Company | Miscellaneous Revenue From Contracts With Customers
Disaggregation of Revenue [Line Items]
Contracts with customers	8,983
Texas-New Mexico Power Company | Alternative Energy
Disaggregation of Revenue [Line Items]
Operating Revenues	4,199	$ 12,212	$ 12,602
Texas-New Mexico Power Company | Other Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	$ 0

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