The organic vapors drive the turbine and are then condensed in a condenser, cooled by air or water. OEC binary generating units are based on an Organic Rankine Cycle, and work by vaporizing a secondary working fluid (organic, with a low boiling point) that is heated by the geothermal fluid extracted from an underground reservoir. Courtesy: Ormat TechnologiesĬD4 comprises two Ormat Energy Converter (OEC) binary generating units, each 21.2 MW, and vaporizers, turbines, generators, air-cooled condensers, preheaters, pumps and piping, and related ancillary equipment. Casa Diablo IV is a state-of-the-art air-cooled binary facility located in Mammoth Lakes, California. The complex taps into the Long Valley Caldera’s hydrothermal system at a point where the hot water is only a few hundred feet below ground. The project is part of the Mammoth complex, which includes three other plants-one completed in 1985 and two added in 1990-each with a generating capacity of approximately 10 MW. subsidiary, declared the 30-MW Casa Diablo IV (CD4) commercially operational on July 20.ĬD4 is located on public land two miles east of the Town of Mammoth Lakes in Mono County, California. The first geothermal power plant built in more than three decades within the California Independent System Operator (CAISO) balancing authority has come online.
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