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CHENA FIRE On May 10th, 2007, a fire broke out in the building the houses the power plant modules. The fire was started by welding sparks that fell inside the building when supports for an overhead door were being mounted to the exterior of the building. Because there was no one inside the building when the fire broke out, it was not noticed immediately. The fire was put out quickly using the power plant water supply and the building received moderate damage which has since been repaired. Unfortunately, burning insulation fell on top of the power plant modules and melted much of the control and electric wiring as well as the control panel. The control room itself was largely undamaged. The fire was a very unfortunate setback, however the Chena crew was able to get ORC2 restarted one month after the fire and it is operating at full capacity. As of the writing of this paper, ORC1 is now being repaired and is expected to be back online in early July. None of the primary system components was damaged during the fire (turbine, generator, heat exchangers, pump). Cold water ran through the units during the entire event, which helped to keep the temperatures down and prevent thermal breakdown of the oil or refrigerant. Fortunately, the refrigerant used in the system (r134a) is non-flammable and therefore did not cause a concern in terms of an accidental release causing the fire to spread. CONCULSION Overall, the Chena project has been highly successful for both UTC and Chena Hot Springs. Chena was able to dramatically reduce costs of onsite power generation, and UTC released the product for sale in early 2007 in a slightly reconfigured package. The power plant has received international recognition, and was awarded the Project of the Year Award by Power Engineering Magazine in the renewable energy category. Chena Hot Springs Resort also received a Green Power Leadership Award from EPA and DOE, and more recently was selected for a very prestigious R&D 100 Award from the Department of Energy. It is hoped that the Chena geothermal plant will encourage other sites to develop moderate temperature geothermal resources in Alaska, throughout the US, and around the world. The project has demonstrated the cost of power production, even in semi-remote locations such as Chena, can be reduced to below 5ยข per kWhr. This makes geothermal power generation highly competitive with existing diesel generation in rural Alaska, particularly since fuel costs are virtually eliminated once the plant is installed. Even in locations with no geothermal resources, the same ORC power generation technology can operate off other industrial waste heat sources to reduce power generation costs. REFERENCES 1. Davis, Neal, Energy in Alaska, presentation at the 2007 Alaska Rural Energy Conference updating information from his book by the same title, published in 1984. 2. Brasz, J.J., Holdmann, Gwen, Power Production from a Moderate -Temperature Geothermal Resource, paper presented at the GRC annual meeting, Reno, Nevada, September 25-28, 2005. 3. Cogswell, F, An ORC power plant operating on a low-temperature (165 F) geothermal source, paper presented at the GRC annual meeting San Diego, California, 2006 4. www.yourownpower.com 5. http://www.utcfuelcells.com/utcpower/products/purecycle/purecycle.shtm 7PDF Image | Chena Hot Springs 400kW Geothermal Power Plant
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