San Juan Generating Station

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San Juan Generating Station is a coal-fired power station owned and operated by Public Service Company of New Mexico (PNM Resources) near Waterflow, New Mexico.

Units 2 and 3 were closed in December 2017.[1] The remaining units (units 1 and 4) are scheduled for closure in 2022, when the coal supply agreement expires. In March 2018 an explosion at unit 1 rendered it inoperable.[2]


The undated satellite photo below shows the power station in Waterflow.

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Coal retirement

In 2013, Public Service Company of New Mexico filed for approval to decommission two of the San Juan Generating Station's coal-burning stacks by 2017 (units 2 and 3), and install nitrogen-oxide emission reducing technology on the remaining two by 2016 (units 1 and 4).[3]

PNM plans to build a natural gas peaking station in San Juan County to generate 177 megawatts during high-demand periods, and a 40 MW solar generation station.[3]

On July 3, 2017, the Public Service Company of New Mexico (PNM) filed an Integrated Resource Plan with the New Mexico Public Regulatory Commission (PRC) concluding that the Most Cost Effective Portfolio for the future operations of PNM includes the full retirement of San Juan Generating Station in 2022.[4]

In December 2017, Units 2 and 3 were retired. Since the shutdown had been planned since 2015, no layoffs were made due to the closure. As of December 2017, Plans to close the remaining two units at the end of 2022 were awaiting state approval.[1]

Plant Data

Coal Ash Contamination in New Mexico.
  • Owner: Public Service Company of New Mexico
  • Parent Company: PNM Resources
  • Capacity: 1,848 MW
  • Units and In-Service Dates: 369 MW (1973), 369 MW (1976), 555 MW (1979), 555 MW (1982)
  • Status: Units 2 and 3 - retired in 2017
  • Location: County Rd. 6800, Waterflow, NM 87421
  • GPS Coordinates: 36.801667, -108.438611 (exact)
  • Coal Consumption:
  • Coal Source:
  • Number of Employees:

Emissions Data

  • 2006 CO2 Emissions: 13,054,091 tons
  • 2006 SO2 Emissions: 14,980 tons
  • 2006 SO2 Emissions per MWh:
  • 2006 NOx Emissions: 27,503 tons
  • 2005 Mercury Emissions: 683 lb.


The plant's operator in April 2011 stated that the plant had outperformed proposed federal limits on mercury emissions. The coal-fired power plant's mercury emissions dropped to 66 pounds in 2010, down from 496 pounds in 2006 after a scrubber was installed at the plant.[5]

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