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Fair Value of Derivative and Other Financial Instruments, Available for Sale Securities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |
Realized impairment loss | $ 4,300,000 | $ 700,000 | $ 600,000
PNMR and PNM [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 259,042,000 | 250,145,000 |
Unrealized Gains | 28,820,000 | 46,348,000 |
Proceeds from sales | 252,174,000 | 117,989,000 | 271,140,000
Gross realized gains | 29,663,000 | 15,162,000 | 14,308,000
Gross realized (losses) | (9,259,000) | (3,964,000) | $ (4,298,000)
Value of other than temporary impairments | 0 |  |
PNMR and PNM [Member] | Cash and equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 10,700,000 | 8,276,000 |
Unrealized Gains | 0 | 0 |
PNMR and PNM [Member] | Domestic value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 44,505,000 | 45,340,000 |
Unrealized Gains | 11,610,000 | 17,418,000 |
PNMR and PNM [Member] | Domestic growth [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 61,078,000 | 74,053,000 |
Unrealized Gains | 11,163,000 | 21,354,000 |
PNMR and PNM [Member] | International and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 27,961,000 | 16,599,000 |
Unrealized Gains | 1,569,000 | 156,000 |
PNMR and PNM [Member] | U.S. Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 27,880,000 | 22,563,000 |
Unrealized Gains | 178,000 | 903,000 |
PNMR and PNM [Member] | Municipals [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 58,576,000 | 68,973,000 |
Unrealized Gains | 3,672,000 | 5,851,000 |
PNMR and PNM [Member] | Corporate and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 28,342,000 | 14,341,000 |
Unrealized Gains | 628,000 | 666,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 259,042,000 | 250,145,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Nuclear Decommissioning Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 249,100,000 | 244,600,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Mine Reclamation Trust [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 9,900,000 | 5,500,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Cash and equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 10,700,000 | 8,276,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Domestic value [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 44,505,000 | 45,340,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Domestic growth [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 61,078,000 | 74,053,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | International and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 27,961,000 | 16,599,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | U.S. Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 27,880,000 | 22,563,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Municipals [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 58,576,000 | 68,973,000 |
PNMR and PNM [Member] | Measured on a recurring basis [Member] | Corporate and other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | $ 28,342,000 | $ 14,341,000 |

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