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Commitments and Contingencies - The Clean Air Act (Details) $ in Millions | Oct. 01, 2014 USD ($) $ / kw MW | Dec. 20, 2013 USD ($) $ / kw MW | Jun. 30, 2015 USD ($) T / yr state MW | May. 19, 2015 MW | Jun. 26, 2014 MW | Oct. 31, 2012 USD ($)
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Clean Air Act related to Regional Haze [Member] |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Public Utilities, Number of States To Address Regional Haze | state |  |  | 50 |  |  |
Public Utilities, Potential to emit tons per year of visibility impairing pollution, maximum | T / yr |  |  | 250 |  |  |
San Juan Generating Station [Member] | Public Service Company of New Mexico [Member] |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  |  |  |  |  | 46.30%
San Juan Generating Station [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Public Utilities, Overall Reduction Of Ownership, in Megawatts | MW |  | 340 |  |  |  |
San Juan Generating Station [Member] | Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member] | Minimum [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SCR [Member] [Member] |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Estimated Total Capital Cost If Requirement Occurred |  |  |  |  |  | $ 824.0
San Juan Generating Station [Member] | Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member] | Minimum [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Estimated Installation Capital Costs |  |  |  |  |  | 85.0
Estimated Portion of Total Capital Costs if Requirement Occured |  |  |  |  |  | 105.0
San Juan Generating Station [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, SCR [Member] [Member] |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Estimated Total Capital Cost If Requirement Occurred |  |  |  |  |  | 910.0
San Juan Generating Station [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 |  |  |  |  |  | 90.0
Estimated Portion of Total Capital Costs if Requirement Occured |  |  |  |  |  | $ 110.0
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, Requested Time Period to Recover Retired Units NBV | 20 years | 20 years |  |  |  |
Public Utilities, Newly Identified Replacement Gas-fired Generation, in Megawatts, December2013 | MW |  | 177 |  |  |  |
Public Utilities, Newly Identified Replacement Solar Generation, in Megawatts, December2013 | MW |  | 40 |  |  |  |
Public Utilities, Newly Identified Replacement Gas-fired Generation, in Megawatts | MW |  |  | 187 |  |  |
San Juan Generating Station Units 2 and 3 [Member] | Pnm Electric [Member] |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |
Estimated cost of replacing gas fired peaking capacity due to retirement of SJGS units |  |  | $ 212.5 |  |  |
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, 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 |  |  |  |
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 |  |  |  |
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 |
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, Ownership To Be Exchanged, in Megawatts | MW |  | 78 |  |  |  |

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