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Financing, Short-term Debt (Details) (USD $) | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended
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Mar. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Line of Credit [Member] | Dec. 31, 2012 Line of Credit [Member] | Jun. 30, 2013 PNM Resources [Member] Revolving credit facility [Member] | Dec. 31, 2012 PNM Resources [Member] Revolving credit facility [Member] | Mar. 31, 2013 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] | Jun. 30, 2013 Public Service Company of New Mexico [Member] Revolving credit facility [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] Revolving credit facility [Member] | Jun. 30, 2013 Texas-New Mexico Power Company [Member] | Mar. 31, 2013 Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Texas-New Mexico Power Company [Member] | Jun. 30, 2013 Texas-New Mexico Power Company [Member] Revolving credit facility [Member] | Dec. 31, 2012 Texas-New Mexico Power Company [Member] Revolving credit facility [Member] | Jul. 26, 2013 Available Borrowing Capacity [Member] | Jul. 26, 2013 Available Borrowing Capacity [Member] PNM Resources [Member] | Jul. 26, 2013 Available Borrowing Capacity [Member] Public Service Company of New Mexico [Member] | Jul. 26, 2013 Available Borrowing Capacity [Member] Texas-New Mexico Power Company [Member] | Jul. 26, 2013 Subsequent Event [Member] PNM Resources [Member] | Jul. 26, 2013 Subsequent Event [Member] Public Service Company of New Mexico [Member] | Jul. 26, 2013 Subsequent Event [Member] Texas-New Mexico Power Company [Member] | Jul. 26, 2013 Affiliated Entity [Member] Intercompany loan agreements [Member] Texas-New Mexico Power Company [Member] | Jun. 30, 2013 PNMR Term Loan Agreement [Member] | Dec. 31, 2012 PNMR Term Loan Agreement [Member] | Dec. 31, 2012 PNMR Term Loan Agreement [Member] Notes Payable to Banks [Member]
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 300,000,000 |  |  |  | $ 400,000,000 |  |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Extension Option, Years | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Short-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000
Short-term Debt, Weighted Average Interest Rate |  | 1.70% |  |  |  |  |  |  |  |  |  | 1.82% |  |  |  |  |  |  |  |  |  |  |  |  | 1.33% |  |
Short-term debt | 160,000,000 |  | 158,700,000 | 160,000,000 | 158,700,000 | 35,000,000 | 37,600,000 | 0 | 21,100,000 | 0 | 21,100,000 |  | 25,000,000 | 0 | 25,000,000 | 0 |  |  |  |  |  |  |  |  | 100,000,000 | 100,000,000 |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 710,900,000 | 261,400,000 | 396,800,000 | 52,700,000 |  |  |  |  |  |  |
Short-term debt – affiliate |  |  |  |  |  |  |  |  |  |  |  |  | 35,800,000 | 28,300,000 |  |  |  |  |  |  |  |  |  | 37,800,000 |  |  |
Restricted Cash and Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,100,000 | $ 6,700,000 | $ 0 |  |  |  |

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