Stillwater Triple Hybrid Power Plant
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Overview
The project is a solar/geothermal plant and constructed by Enel Green Power. 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 from the plant was sold to NV Energy. In summer, the PV plant produces more when the thermal plant is less efficient due to dry cooling in high temperatures.
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Geothermal plant
The plant entered into operation in 2001, and revitalized in 2009.
Solar photovoltaic plant
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.
Solar thermal plant
An additional 2 MWe (17 MWth) using concentrated solar power (CSP) in parabolic troughs began construction in 2014. 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. The CSP plant became operational in 2015.