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Commitments and Contingencies - Stipulation Filed with the NMPRC (Details) $ in Millions	Apr. 08, 2015 USD ($) MW	Oct. 01, 2014 USD ($) $ / kw MW	Dec. 20, 2013 USD ($) $ / kw MW	Jun. 30, 2015 USD ($) MW	May. 19, 2015 MW	Jan. 15, 2015 MW	Jun. 26, 2014 MW
San Juan Generating Station Unit 4 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Additional Ownership To Be Obtained, in Megawatts | MW		132	78	132	132		132
Public Utilities, Estimated rate base value at 1/1/2018		$ 26.0
Public Utilities, Ownership in Megawatts PNM has agreed not to obtain | MW						65
San Juan Generating Station Unit 4 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR Hearing Examiner Recommended Denial [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Additional Ownership To Be Obtained, in Megawatts | MW	132
Period of time to accept or reject modifications in recommendation	7 days
San Juan Generating Station Unit 3 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Proposed reduction in carrying value		26.0
Public Utilities, Estimated unrecoverable increase in operations and maintenance		20.0
San Juan Generating Station Unit 3 [Member] | Maximum [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Estimated pre-tax regulatory disallowance	$ 155.0	70.0
San Juan Generating Station Unit 3 [Member] | Minimum [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Estimated pre-tax regulatory disallowance	145.0	$ 60.0
San Juan Generating Station Units 2 and 3 [Member] | Public Service Company of New Mexico [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Net book value				$ 278.0
San Juan Generating Station Units 2 and 3 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Recovery Percentage of Estimated undepreciated value at 12/31/17		50.00%
Public Utilities, Estimated undepreciated value at 12/31/17	$ 128.5	$ 231.0
Public Utilities, Requested Time Period to Recover Retired Units NBV		20 years	20 years
Public Utilities, Write-off Percentage of Estimated undepreciated value at 12/31/17	50.00%	50.00%
Palo Verde Nuclear Generating Station Unit 3 [Member] | Public Service Company of New Mexico [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Net book value				$ 147.0
Palo Verde Nuclear Generating Station Unit 3 [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Estimated rate base value at 1/1/2018		$ 221.1
Public Utilities, Proposed value per Kilowatt effective January 1, 2018 | $ / kw		1,650
Palo Verde Nuclear Generating Station Unit 3 [Member] | PNMR and PNM [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Number of Megawatts Nuclear Generation | MW				134
Palo Verde Nuclear Generating Station Unit 3 [Member] | PNMR and PNM [Member] | Clean Air Act, SNCR [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Number of Megawatts Nuclear Generation | MW		134	134
Public Utilities, Proposed value per Kilowatt effective January 1, 2018 | $ / kw			2,500
Public Utilities, Percentage capacity factor 7-year performance threshold		75.00%
Public Utilities, Period over which to measure capacity performance		7 years
San Juan Generating Station Units 1 and 4 [Member] | Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member] | Maximum [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Estimated Installation Capital Costs		$ 90.6	$ 82.0

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