Stillwater site

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The Stillwater GeoSolar Hybrid Plant is a combined 61 MW solar energy and geothermal power plant in the U.S. state of Nevada. Located 12 miles (19 km) NE of Fallon, near Stillwater, the site includes a 26MW solar photovoltaic plant and a 2MW solar thermal plant that were added to a 33MW geothermal plant.


The project is the world's first combined solar/geothermal plant and constructed by Enel Green Power. It is also the first triple hybrid power plant, combining geothermal, photovoltaic and solar thermal power generation, using the Organic Rankine cycle.[1] POWER Engineers Inc. provided detailed engineering services for the original binary geothermal plant as well as for the 2 MW Concentrating Solar Power (CSP) system. The total output of 15 GWh/month[2] from the plant was sold to NV Energy.[3][4][5] In summer, the PV plant produces more when the thermal plant is less efficient due to dry cooling in high temperatures.[1]

Geothermal plant[edit]

The plant entered into operation in 2001,[2] and revitalized in 2009.[6]

Solar photovoltaic plant[edit]

Covering 240 acres (97 ha), the plant has 89,000 polycrystalline silicon solar panels and has a generation capacity of 26 MW. The photovoltaic generation was designed to make up for the reduction in output from the geothermal plant due to high ambient temperatures during summer midday hours.[1]

Solar thermal plant[edit]

An additional 2 MWe (17 MWth) using concentrated solar power (CSP) in parabolic troughs began construction in 2014.[7] In addition to generating electricity, the CSP facility is expected to extend the life of the geothermal reservoir used for the geothermal portion of the facility.[1] The CSP plant became operational in 2015.[8]

External links[edit]


  1. ^ a b c d DiMarzio, Angelini, Price, Dhin, Harris (April 2015). "The Stillwater Triple Hybrid Power Plant - Integrating Geothermal Solar Photovoltaic and Solar Thermal Power Generation" (PDF). Archived (PDF) from the original on 2016-03-05. 
  2. ^ a b "Stillwater Facility, annual". Electricity Data Browser. Energy Information Administration. Retrieved September 7, 2017. 
  3. ^ Brit Liggett (August 31, 2011). "Harry Reid Announces the World's First Hybrid Solar-Geothermal Power Plant". 
  4. ^ Nathanael Baker (August 17, 2011). "Enel Green Power Receives Approval for North America's First Renewable Hybrid Power Plant". Retrieved November 3, 2012. 
  5. ^ Steve Ranson (May 3, 2012). "Enel inaugurates Stillwater solar-geothermal hybrid project (update)". Lahontan Valley News. Retrieved November 4, 2012. 
  6. ^ Rob Sabo (May 7, 2012). "Pioneering project begins operation". Northern Nevada Business Weekly. Retrieved November 3, 2012. 
  7. ^ "Concentrating Solar Power Projects - Stillwater GeoSolar Hybrid Plant - Concentrating Solar Power - NREL". October 21, 2016. Retrieved September 7, 2017. 
  8. ^ Enel Green Power. "EGP-NA named GEA Honors 2015 Award Winner for First-of-Its-Kind Hybrid Plant". 

Coordinates: 39°32′38″N 118°33′40″W / 39.544°N 118.561°W / 39.544; -118.561