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Commitments and Contingencies - National Ambient Air Quality Standards (Details) - Public Service Company of New Mexico | Feb. 25, 2019 parts_per_billion | Oct. 01, 2015 parts_per_billion | Sep. 30, 2015 parts_per_billion | May 14, 2015 lb / MMBTU
--- | --- | --- | --- | ---
Maximum | San Juan Generating Station And Four Corners |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Government standard emissions limit (in parts per billion) | parts_per_billion | 75 | 70 | 75 |
National Ambient Air Quality Standards | San Juan Generating Station |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Revised SO2 emissions agreed upon (in pounds per MMBTU) | lb / MMBTU |  |  |  | 0.10

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