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Reservoir Confirmed at the WPG Geysers Project in California Adapted from a Press Release by MarketWatch U.S. Geothermal Inc. announced it has received the reservoir engineering re- port for the WGP Geysers project from third party engineering firm GeothermEx Inc. (a Schlumberger company). The company successfully completed a flow test program in June on the three largest production wells at the project in northern California, confirming the wells were still open and ready for production. GeothermEx Inc. designed the isochronal (step-rate) flow test program, and monitored the well testing process. GeothermEx reported the four production wells are capable of delivering an ini- tial capacity of 28.1 megawatts (MW) gross (25.4 MW net) based on current power plant steam conversion rates from a detailed design for a 28.8 MW (net) power plant. These longer term tests show the wells would initially produce a combined total of 458,000 pounds per hour of steam compared to 462,000 pounds per hour of steam from short-term tests performed when the wells were first drilled, demonstrating the capacity of the wells is virtually unchanged. Two methods were used to estimate the long-term capacity of the project, and both support a high probability the plant can be operated for 25 years, given the modern plant design and the available productive area. "The results of this analysis from our test program clearly shows that the WGP Geysers project has approximately 30 megawatts of steam, drilled, tested, and ready for production, and that, with the higher injection rates provided by hybrid cooling, it has the reservoir to support long-term generation," said Dennis Gilles, CEO of U.S. Geothermal. "We are pleased with [the] passage of SB-350 in California, which now raises the Renewable Portfolio Standard for the state to 50% renewable energy by 2030, the highest in the country, and we anticipate this will increase the interest in a power purchase agreement for our WGP Geysers project." Photo courtesy of u.S. Geothermal. 57 WorldWide Drilling Resource ® JANUARY 2016