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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Assets, Current | $ 401,030,000 | $ 401,539,000
Liabilities, Current | 312,088,000 | 492,671,000
Commodity derivative instruments, Current assets | 4,003,000 | 4,064,000
Commodity derivative instruments, Deferred charges | 2,474,000 | 3,002,000
Commodity derivative instruments, Current liabilities | (5,446,000) | (2,699,000)
Commodity derivative instruments, Long-term liabilities | (907,000) | (1,094,000)
PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Margin Deposit Assets | 3,100,000 | 2,800,000
Derivative, Collateral, Obligation to Return Cash | 100,000 | 200,000
Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets, Current | 345,261,000 | 348,502,000
Liabilities, Current | 156,140,000 | 357,266,000
Commodity derivative instruments, Current assets | 4,003,000 | 4,064,000
Commodity derivative instruments, Deferred charges | 2,474,000 | 3,002,000
Commodity derivative instruments, Current liabilities | (5,446,000) | (2,699,000)
Commodity derivative instruments, Long-term liabilities | (907,000) | (1,094,000)
Commodity Contract [Member] | Fair Value Hedging [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 4,003,000 | 4,064,000
Commodity derivative instruments, Deferred charges | 2,474,000 | 3,002,000
Commodity derivative instruments, Assets | 6,477,000 | 7,066,000
Commodity derivative instruments, Current liabilities | (5,446,000) | (2,699,000)
Commodity derivative instruments, Long-term liabilities | (907,000) | (1,094,000)
Commodity derivative instruments, Liabilities | (6,353,000) | (3,793,000)
Commodity derivative instruments, Net | 124,000 | 3,273,000
Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Fair Value Hedging [Member] | Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets, Current | 400,000 | 400,000
Liabilities, Current | 600,000 | 100,000
Palo Verde Nuclear Generating Station [Member] | Commodity Contract [Member] | Fair Value Hedging [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 3,000,000 | 3,000,000
Commodity derivative instruments, Deferred charges | 2,300,000 | 3,000,000
Palo Verde Nuclear Generating Station [Member] | Firm Contract [Member] | Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Percentage of Electric Power Plant Output Sold through 2013 | 100.00% |
Palo Verde Nuclear Generating Station Unit 3 [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Public Utilities, Number of Megawatts Nuclear Generation | 134 |
Palo Verde Nuclear Generating Station Unit 3 [Member] | Commodity Contract [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Average Forward Price |  | 37
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Commodity Contract [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Assets | 6,477,000 | 7,066,000
Commodity derivative instruments, Liabilities | (6,353,000) | (3,793,000)
Commodity derivative instruments, Net | 124,000 | 3,273,000
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commodity Contract [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Assets | 0 | 0
Commodity derivative instruments, Liabilities | 0 | 0
Commodity derivative instruments, Net | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commodity Contract [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Assets | 6,477,000 | 7,066,000
Commodity derivative instruments, Liabilities | (6,353,000) | (3,793,000)
Commodity derivative instruments, Net | $ 124,000 | $ 3,273,000

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