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400kW Geothermal Power Plant at Chena Hot Springs

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400kW Geothermal Power Plant at Chena Hot Springs ( 400kw-geothermal-power-plant-at-chena-hot-springs )

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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 2. BACKGROUND – POWER GENERATION PROJECT Because the largest operational expense for the site is power generation, Chena has long been interested in tapping the available geothermal resource for generating electric power. However, an exploration program conducted in the late 1970’s and early 80’s (Wescott and Turner, 1981) discounted the site for power generation with technology available at that time. As a result, Chena decided to take a two-tiered approach to re- evaluating the site for power generation. Simultaneous projects were undertaken with the first involving the short-term installation of a small geothermal power plant designed to operate off the existing, proven resource. At the same time, a more extensive exploration and assessment program was conducted to define the deeper resource potential, and ensure the long-term sustainability of the resource. This second exploration program became the DOE funded Chena Hot Springs GRED III project. Finding a manufacturer willing to work on a small generation project at a marginal resource proved to be challenging. Initial project quotes were obtained from Ormat and Barber-Nichols, both companies experienced in geothermal development. Eventually Barber-Nichols was selected to manufacture a single 400kW power plant for Chena. This power plant would have closely resembled existing Barber-Nichols installations at Wendel Hot Springs in California. The initial AEA Grant Application was submitted with Barber-Nichols as the manufacturer. In October, 2004, Chena Hot Springs was approached by the United Technologies Research Center (a division of United Technologies Corporation) on the recommendation of the Department of Energy Geothermal Technologies Program. United Technologies Corporation had developed a modular ORC power generation system designed to use waste heat from industrial applications. The product was called the PureCycle 200, and United Technologies was interested in installing a unit to operate on heat from a geothermal resource as another application of their technology. Chena was an excellent candidate for the project, and after discussion with Barber-Nichols, it was decided to proceed with a project through United Technologies Corporation. The primary reason for making the switch in manufacturer was that United Technologies (UTC) represented an opportunity to further the geothermal industry as a whole. UTC had developed a unique approach to reducing costs through the use of inexpensive, mass produced, U.S. manufactured air conditioning and refrigeration equipment from Carrier Refrigeration4. In fact, UTC’s stated goal was to reduce the cost of geothermal power generation equipment from $3000/kWhr installed to $1300/kWhr installed. In contrast, Barber-Nichols had last manufactured a geothermal power plant in the mid 1980’s and did not intend to build additional units in any significant quantity. Therefore, the opportunity for the Chena project to impact future development in Alaska and elsewhere would be limited. 4 Carrier Refrigeration is a division of United Technologies Corporation 6

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