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Geothermal Resources in the Caribbean and Latin America

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Geothermal Resources in the Caribbean and Latin America ( geothermal-resources-the-caribbean-and-latin-america )

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compared to México’s other geothermal resources, e.g., reservoir located in the basement, low permeability, low pressure, and located in an ecological preservation area. Present knowledge indicates that the geothermal reservoir is of small size with limited fluid recharge (Lopez et al, 1995). Due to the location of the field in an ecological preserve, CFE has decided that 5 MWe condensing units are appropriate. A binary cycle would also be possible but only if it uses steam (CFE has already bought small capacity plants to use the separated water). The estimated useful life of the resource is 25 years. Las Tres Vírgenes will supply electricity to the small, isolated Santa Rosalía grid where the maximum present demand is 6 MWe supplied by diesel generators at high cost. Alargeincreaseindemandisexpected. The approximate cost of a 5MWe plant with two wells including exploration is $13 million or 4¢ US/kWh (Le Bert, 1997). POTENTIAL (MWE) 25 TEMPERATURE (EC) 245-280 CHRONOLOGY 1984 to 1993 - Geological, geohydrology, geophysics, geochemistry, and petrography studies conducted by CFE; exploratory boreholes drilled. 1997 - Drilled seven wells to depths of 1291 to 2500 m; four wells are producing at 25-30 t/h steam and 50-80 t/h water,threeareinjection. Thewaterisalkalichloride (sodium-chloride); geothermometer temperatures have reached 280oC. 1997 - International bidding opened for 10 (2 x 5) MWe Las Tres Vírgenes I as a BLT. 1998 - Las Tres Vírgenes I due for award at end of year. 2000 - First Stage (Tres Vírgenes I); Two 5 MWe plants expectedtobeonline. Thefirstunitwillbebuiltnear wellsLV-1and5,thesecondnearLV-3and4. Steam consumption required is 24 kg/s. 2001- Second Stage (Tres Virgenes II); an additional 15 MWe expected to be online. NOTES The Las Tres Vírgenes field has different characteristics Los Azufres LOCATION In central México in the Sierra de San Andrés, 220 km Geothermal Resources in Latin America & the Caribbean 65

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