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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
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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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