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Unlocking Geothermal Power Eastern Caribbean Powerhouse

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Unlocking Geothermal Power Eastern Caribbean Powerhouse ( unlocking-geothermal-power-eastern-caribbean-powerhouse )

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2.3 Geothermal Projects in Costa Rica Table 2.3 shows the current geothermal units in Costa Rica. Costa Rica currently has an installed capacity of 163 MW in Miravalles and 35 MW in Las Pailas, for a total of 198 MW of installed geothermal capacity. ICE commissioned Unit 1 (55 MW) in March 1994, and continued the development of Unit 2 (another 55 MW) in the Miravalles geothermal field. ICE installed the first wellhead unit WHU-1 (5 MW), which entered into operation by the end of 1994. Because some of the production wells were already drilled and the construction of Unit 2 was still underway, ICE and the Comisión Federal de Electricidad in Mexico (CFE) made an agreement to use wellhead units of CFE for generation in Miravalles. This agreement was in place while ICE built Unit 2. Once this unit was ready, the production wells used in WHU-2 and WHU-3 were dismantled and returned to CFE. Table 2.3 Geothermal Plants in Costa Rica Plant Name Power Owner Start Shut-Down (MW) Year Miravalles 55 5 5 5 55 29 19 ICE ICE CFE CFE ICE ICE ICE 3/1994 11/1994 9/1996 2/1997 8/1998 3/2000 1/2004 Las Pailas Unit 1 WHU-1 WHU-2 WHU-3 Unit 2 Unit 3 Unit 5 Unit 1 4/1999 4/1998 While drilling the wells for Unit 2 in Miravalles, some extra wells were drilled to supply the corresponding steam to Unit 3, which began operations in March 2000. Unit 3 was a Build- Operate-Transfer project for 15 years; in March 2015, it became the property of ICE. Units 1, 2, and 3 are all single-flash units. At the Miravalles geothermal field, ICE decided to install a binary plant in order to take advantage of some extra energy from the brine. By January 2004, the binary plant (Unit 5) was online, with a capacity of 19 MW. At the Las Pailas geothermal field (Rincón de la Vieja volcano), ICE commissioned a binary plant (35 MW) in July of 2011, using its own financial resources as well as aid from the Central American Bank of Economic Integration (CABEI). Las Pailas Unit 1 belongs to CABEI, but after 12 years of monthly payments, ICE will get first opportunity to buy the geothermal unit. 35 ICE 7/2011 16

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