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Regulatory and Rate Matters - Renewable Energy Rider (Details) - Public Service Company of New Mexico [Member] - Renewable Energy Rider [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Public Utilities, General Disclosures [Line Items] |  |  |
Revenue from renewable energy rider | $ 42.0 | $ 41.9 | $ 31.9
Maximum [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Annual revenue to be collected | 42.4 |  |
Proposed collection through energy rider | $ 50.0 |  |
NMPRC-approved return on equity | 0.50% |  | 10.50%
Initial approved return on equity | 10.00% |  |

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