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Commitments and Contingencies - SJGS Matters (Details) | Jul. 31, 2015 MW | Jun. 30, 2015 MW | May. 19, 2015 MW | Apr. 08, 2015 MW | Jan. 22, 2015 USD ($) | Jan. 07, 2015 MW | Oct. 01, 2014 MW | Jun. 27, 2014 USD ($) | Jun. 26, 2014 USD ($) MW | Mar. 11, 2014 USD ($) | Dec. 20, 2013 MW
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Clean Air Act, SNCR [Member] | San Juan Generating Station Unit 4 [Member] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Unsubscribed Ownership in Megawatts |  |  |  |  |  | 65 |  |  |  |  |
Public Service Company of New Mexico [Member] | San Juan Generating Station Unit 4 [Member] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Jointly Owned Utility Plan, Proposed Proportionate Ownership Share |  |  |  |  |  |  |  |  | 64.50% |  |
Public Service Company of New Mexico [Member] | San Juan Generating Station Units 1 and 4 [Member] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Jointly Owned Utility Plan, Proposed Proportionate Ownership Share |  |  |  |  |  |  |  |  | 58.70% |  |
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] | San Juan Generating Station Unit 3 [Member] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership held by exiting owners |  | 50.00% |  |  |  |  |  |  |  |  |
Public Utilities, Ownership Percentage |  | 50.00% |  |  |  |  |  |  |  |  |
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] | San Juan Generating Station Unit 4 [Member] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership held by exiting owners |  | 38.80% |  |  |  |  |  |  |  |  |
Public Utilities, Ownership Percentage |  | 38.50% |  |  |  |  |  |  |  |  |
Public Utilities, Additional Ownership To Be Obtained, in Megawatts |  | 132 | 132 |  |  |  | 132 |  | 132 |  | 78
Public Utilities, Costs to obtain additional ownership | $ |  |  |  |  |  |  |  |  | $ 0 |  |
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] | Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member] | San Juan Generating Station Unit 4 [Member] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested Expenditure, Installation Capital Costs | $ |  |  |  |  | $ 76,600,000 |  |  |  |  | $ 1,900,000 |
Requested Additional Expenditure, Installation Capital Costs | $ |  |  |  |  |  |  |  | $ 6,400,000 |  |  |
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR Hearing Examiner Recommended Denial [Member] | San Juan Generating Station Unit 4 [Member] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Additional Ownership To Be Obtained, in Megawatts |  |  |  | 132 |  |  |  |  |  |  |
PNMR Development [Member] | Clean Air Act, SNCR [Member] | San Juan Generating Station Unit 4 [Member] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Potential Acquisition of Ownership in Megawatts |  | 65 | 65 |  |  | 65 |  |  |  |  |
Subsequent Event [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR Hearing Examiner Recommended Denial [Member] | San Juan Generating Station Unit 4 [Member] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Additional Ownership To Be Obtained, in Megawatts | 132 |  |  |  |  |  |  |  |  |  |

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