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Utilization of Low- and Medium-Enthalpy Geothermal

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Utilization of Low- and Medium-Enthalpy Geothermal ( utilization-low--and-medium-enthalpy-geothermal )

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Maynard-Date and George 4 A Caribbean geothermal success story located in Laudat (Well Pad WW-3) and Trafalgar, approximately six (6) and four (4) miles respectively, from the capital Roseau (Figure 1). The drilling of the reinjection well WW-R1 started on November 6, 2013 and was completed by December 20, 2013. This well achieved a depth of 1915m and its completion saw the commencement of the directional production well WW-P1 in January 14, 2014 and was completed on March 1, 2014 with a depth of 1505m. The flow test of the production well WW-P1 is planned for the end of May 2014. Preliminary injection tests indicate that the well is highly permeable with temperatures above 230 degrees Celsius, with an expected generation capacity of 5-7 MW. Being the Nature Isle of the Caribbean, the GoCD seeks to consider all the relevant impact such a project will have on key aspects of the country such as the Environment. Therefore, the Environmental Impact Assessment (EIA) for the drilling of two production wells commenced at the end of August 2013 prior to the disturbance of any flora or fauna in the desired area. The EIA was funded by the Regional Council of Guadeloupe and was carried out by a number of consulting firms to include: • Caraïbes Environnement is a consulting firm based in Guadeloupe with 18 years of experience in conducting EIA’s. • ASCONIT Consultants is a private consulting firm specialized in Water Resource Monitoring and Management and is based mainly in Guadeloupe and Martinique since 2005. • TERANOV is a consulting firm with expertise in Geothermal Energy. • Eclipse Inc. is a local Management Consulting Firm which specializes in Natural Resource Management, Environmental Impact Analysis, and Ecological Analysis among others. Their main focus for this EIA study will be as Experts in Flora and Fauna. 3. FUTURE PROSPECTIVE The future advancement of the geothermal success story for the Commonwealth of Dominica lies in the effort of the GoCD in seeking to develop a 10 – 15 megawatt Geothermal Power Plant within the Roseau Valley Geothermal field in keeping with the initial objective laid out in this project. It is envisaged however, that this development will occur in incremental phases, which will be determined in the production planning stage, and based to a large extent on the productive capacity of the wells, the scale at which a base-load geothermal power plant can be absorbed on the local grid and to the dictates of local demand. The development of the Small Geothermal Power Plant (SGPP) is intended to reduce the cost of electricity to consumers, and will also serve as a pilot and demonstration plant which would allow for further assessment of the resource and to observe the reaction of the reservoir to commercial exploitation, thereby guiding the planning and management of the further exploitation and development of the resource to provide electricity for Martinique and Guadeloupe by way of a 100 – 120 MW Large Geothermal Power Plant (LGPP). Technical Assistance Team ELC is carrying out this feasibility study with assistance from the World Bank and other international experts. Similarly the GoCD is working closely with the Dominica Electricity Services Limited (DOMLEC) and the Independent Regulatory Commission (IRC) in terms of integrating geothermal energy into the current energy mix and to assess whether any regulatory changes to the existing concession agreement would be deemed necessary. The first phase of the SGPP is slated to be commissioned by the end of 2015 or first quarter of 2016. The development strategy as put forward in the 2008 study under the INTERREG III B programme proposed 10-20 MW for the Dominican Market and 50 MW each for Martinique and Guadeloupe.

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