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A Caribbean geothermal success story 3 Maynard-Date and George The objective of the exploratory works was to determine the quantity and quality of the geothermal resource in the Roseau Valley, how this resource reacts to economic and technical exploitation and the level of electricity which could be generated to provide a cheaper source of energy for Dominica. Once successful, the overall long term objective would be the construction of a geothermal power plant to meet local demand and to sell surplus electricity to the neighbouring islands of Guadeloupe and Martinique via submarine cable. Preliminary assessments carried out using the available data from the exploration wells drilled and the pre-feasibility studies, confirm that there was in fact sufficient geothermal resources to develop the proposed Small Geothermal Power Plant (SGPP) of up to 15 MW for the local market. The completed flow tests and collected data (Tables 1 and 2) confirm a geothermal resource base of 65 MW at a 90 percent (P90) probability of confidence which is considered to be a usual threshold for commercial developers and financiers (Figure 2) to determine the bankability of an investment. TABLE 1: Summary of drilling operations for exploratory wells Activity Commencement date Completion date Final depth Depth of 4 1⁄2” slotted liner Number of days drilling Total number of work days WW-2 16-Dec-2011 28-Jan-2012 1469 m 1337 m 41 65 WW-3 15-Feb-2012 14-Mar. 2012 1613 m 1605 m 29 40 WW-1 28-Mar-2012 27-Apr-2012 1200 m 1200 m 31 42 WW-1 27-Jun-2012 238°C 100 bars 1028 kJ/kg 3.9 MW TABLE 2: Flow test results of exploratory wells Date of flow test Highest temperature logged Highest pressure logged Enthalpy Potential generation rate WW-2 Mar. 9-10 2012 241°C 82 bars 940 kJ/kg 0.5 MW WW-3 17-Apr-2012 245°C 98 bars 980 kJ/kg 2.9 MW EU AFD GoCD - 5.000.000 10.000.000 15.000.000 GoCD AFD EU US$ 5.105.557 4.619.010 1.961.655 XCD$ 13.871.288 12.549.389 5.329.620 Having successfully completed the phase of drilling and testing of three exploratory wells and proven the existence of a viable geothermal resource, GoCD has progressed to the next stage of seeking to develop a 10 – 15 MWe Small Geothermal Power Plant (SGPP) within the Roseau Valley Geothermal field. The GoCD has received funding from the AFD by way of a €6.5M concessionary loan agreement for the implementation of the drilling and testing program that basically consists in the drilling and testing of 2 full size wells (a production well [WW-P1] and an injection well [WW-R1]). The sites for drilling are FIGURE 2: Overall cost of exploratory drillingPDF Image | Utilization of Low- and Medium-Enthalpy Geothermal
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