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NCPA operates two geothermal power plants of 110 megawatts each at The Geysers geothermal field, located in the Mayacamas mountains of Sonoma and Lake Counties, and the agency also owns and operates the 70 deep production wells that supply these power plants with steam. In addition, the geothermal project includes 8 deep injection wells used to re-supply the geothermal reservoir with water to create additional steam, 10 miles of surface pipelines to deliver the produced steam to the plants, two surface water collection ponds, and a co-owned major wastewater delivery system consisting of five pump stations and 26 miles of underground pipeline that are used to supply additional fluids for injection.
For more than 25 years the NCPA Geothermal Project has been a source of clean, renewable energy that has consistently provided the participating NCPA Members with a reliable supply of electricity at very competitive costs. In the fall of 2008, a 1 mw, 30% capacity factor solar photovoltaic project will supply peak power to one of the effluent pumping stations whereby a renewable project (solar) is used to support another renewable project (geothermal), all the while disposing of treated wastewater for the nearby communities of Lake County.
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