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for only a few days to complete final hookup of control wiring, systems check, and initial startup. The second unit is essentially identical to the first one, with the exception of some alterations to the turbine exhaust pipe and bypass tubing for the refrigeration system. As discussed previously, the second ORC unit is a dual air and water cooled system. This allows maximization of system performance by taking advantage of the cold ambient air in winter, and the cool groundwater in the summer months. The second unit has been operating consistently since installation. Due to problems with the cold water supply during the late winter and early spring months (a lower water table and temperatures dropping to -50 oF hampered operations), ORC #1 was temporarily shut down. This issue will be eliminated with the installation of a second air cooled condenser and possible construction of a cooling pond during intermittent seasons. Both units are expected to be running in tandem by August 2007. MODIFICATION TO EXISTING ELECTRIC INFRASTRUCTURE AND HOOKUP TO UPS SYSTEM One of the major project challenges has been upgrading an aging diesel generator plant and marginal power distribution infrastructure to permit installation of the geothermal power plant modules. Modifications to the existing electric infrastructure began almost a year prior to the installation of the first ORC module. One specific challenge was how to allow the geothermal modules, which generate power via induction generators and thus requires grid support to provide a stable input voltage and frequency for startup to operate as stand alone generation. This was accomplished through the installation of a 3MW UPS system. The 480VAC/DC inverter which is part of the UPS system can provide voltage and frequency to the induction generator as it extracts current. This type of system, with batteries for startup and load balancing, allows for the grid-independent operation required by Chena Power. An additional benefit of the UPS system was that it allows seamless power production from multiple sources (primarily the ORC units and the paralleled diesel generators) to smoothly and continually provide power to the site, via the inverters. PROJECT ECONOMICS The project has been completed on schedule and close to the original budget of $1,899,065. At the end of 2006, project expenses totaled $2,007,770, or 5% above the original estimate. The project was funded in part through a $246,288 grant from the Alaska Energy Authority. An additional loan was obtained through the AIDEA Power Project Loan Fund in the amount of $650,000. The rest of the project included cash and in-kind contributions from Chena Power and its sister corporations Chena Hot Springs Resort and K&K Recycling. The Chena geothermal power plant was completed on schedule and very close to the initial budget projection. The power plant logged over 3000 hours with 95% availability in 2006, generating 578,550kWhrs and displacing 44,500 gallons in diesel fuel. In 2007, the project is expected to generate 3 million kWhrs of clean geothermal power and displace 224,000 gallons of diesel for an estimated savings of $550,000. 6PDF Image | Chena Hot Springs 400kW Geothermal Power Plant
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