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electricity for Nome, as well as direct-use heat applications on site. Past exploration efforts dating to the late 1970s and early 1980s concluded the resource could be large enough, but the actual upflow zone of the geothermal fluid was never pinpointed and coupled with limitations in low temperature geothermal power generation equipment available during that era, further investigation of the resource stalled. Chena Hot Springs- The geothermal greenhouses at Chena Hot Springs Resort near Fairbanks utilize a geothermal heat source of up to 80°C (176°F), or about 9°C (16°F) warmer than the temperatures measured at Division Hot Springs, and 32°C (57°F) warmer than Granite Mountain Hot Springs. The two main Chena greenhouses have a combined floor area of 4320 ft2, and are operated by the resort in collaboration with the UAF Agriculture and Forestry Experiment Station, as part of a controlled environment research project. Lettuce tomatoes, green beans, peppers, cucumbers, and numerous greens and herbs have been grown in these greenhouses. The lessons learned from this research at Chena will be valuable for new geothermal greenhouse projects in Alaska such as those possible at Division and Granite Mountain. Galena recovered heat greenhouse project- This Tanana Chiefs Conference, in partnership with ACEP, received Environmental Protection Agency (EPA) funding to construct and operate a 100’ x 30’ greenhouse using recovered heat from Galena’s diesel power plant. The goal is to extend the growing season by a few months in both the spring and the fall, growing fresh produce for the community and its schools, while employing several local high school students. The greenhouse project would be supervised by faculty from UAF’s Controlled Environment Agriculture Laboratory and the UAF School of Natural Resources and Agricultural Sciences. The City of Galena, and other local organizations are also participating in the project. In addition to the Galena greenhouse, this project will involve feasibility studies on six other rural Alaska communities in different regions of the state to evaluate their potential for similar greenhouse projects. The experience of diesel- engine heat recovery from these pilot greenhouse projects will prove valuable for diesel-dependent communities in the NANA region and elsewhere, but also for projects at remote hot springs sites. The chief challenge facing both ecotourism and geothermal greenhouses is the transportation logistics associated with the remote hot spring sites. Transportation of materials and people over the 40-mile, one-way distance from the nearest community is expensive and time consuming. At present, both Granite Mountain and Division hot springs are chiefly accessed by snow machine only, for at most about half the year. Therefore, greenhouses using recovered heat from existing diesel power plants in the region are likely to be more economic to operate than those at remote hot spring sites. If a particular NANA community steps forward to offer a demonstration site alongside an existing diesel power plant, a community greenhouse warmed by the plant’s recovered heat is definitely worthy of investigation. 10 DE-FG36-07GO17075PDF Image | US Department of Energy Tribal Energy Program
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