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Financing - Financing Activities (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May. 08, 2015 | Dec. 31, 2014 | Jun. 30, 2015 | Jun. 01, 2015 | Mar. 09, 2015 | Dec. 22, 2014 | Mar. 05, 2014 | Apr. 22, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  | $ 105,600 | $ 187,600 |  |  |  |  |
PNMR 2015 Term Loan Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  | $ 150,000 |  |  |
Debt Instrument, Interest Rate at Period End |  |  | 1.19% |  |  |  |  |
Public Service Company of New Mexico [Member] | PNM 2014 Term Loan Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  | $ 175,000 |
Debt Instrument, Interest Rate at Period End |  |  | 1.14% |  |  |  |  |
Public Service Company of New Mexico [Member] | PNM 2014 Multi-Draw Term Loan Agreement [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 125,000 |  |  | $ 125,000 |  |
Debt Instrument, Interest Rate at Period End |  |  | 0.77% |  |  |  |  |
Proceeds from (Repayments of) Debt | $ 25,000 | 100,000 |  |  |  |  |  |
PNM Term Loan Agreement [Member] | Notes Payable to Banks [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  | $ 75,000
Senior unsecured note, due 2015, at 9 point 25 percent [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unsecured Long-term Debt, Noncurrent |  | $ 118,800 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 9.25% |  |  |  |  |  |
Senior unsecured note, PCRB Due 2043, at 4 percent [Member] | Public Service Company of New Mexico [Member] | Unsecured notes, Pollution control revenue bonds [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unsecured Long-term Debt, Noncurrent |  | $ 39,300 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.40% |  |  |  |
Senior unsecured note, PCRB Due 2043, at 2 point 4 percent [Member] | Public Service Company of New Mexico [Member] | Unsecured notes, Pollution control revenue bonds [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unsecured Long-term Debt, Noncurrent |  |  |  | $ 39,300 |  |  |  |

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