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Regulatory and Rate Matters - Application for Certificate of Convenience and Necessity (Details) - MW | Apr. 26, 2016 | Jun. 30, 2015
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San Juan Generating Station Units 2 and 3 | Clean Air Act, SNCR | Public Service Company of New Mexico |  |
Public Utilities, General Disclosures [Line Items] |  |
Newly-identified replacement gas plant (in mw) | 80 | 187

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