Sustainable Energy Opportunities: Best Practices for Alaska Tribes

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Sustainable Energy Opportunities: Best Practices for Alaska Tribes ( sustainable-energy-opportunities-best-practices-alaska-tribe )

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Types of Geothermal Uses There are two distinct types of geothermal energy that can be used depending on the specific conditions of the region. The ground temperatures that are available in a certain geographic region dictate how they can be used. Geothermal Electrical Generation Producing Electricity from geothermal sources requires high heat sources, like those found in the hot springs regions of Alaska. The lowest temperature hot spring source that has been utilized for electricity production is at Chena Hot Springs outside of Fairbanks, which operates at ground temperatures of 165°F. Produced by United Technologies Corporation (UTC) and owned by Chena Hot Springs Resort, the $2.1 million system generates 680kW of electricity, displaces 224,000 gallons of diesel and reduces energy costs to as low as $0.05 per kWhr. The geothermal heat is also used for space, greenhouse, and hot water heating, and to run a 16 ton absorption chiller that keeps an outdoor ice museum frozen year round. Other areas that have undergone testing for geothermal energy sources include Mt. Spurr near Anchorage, the City of Akutan in the Aleutians and areas around Mt. Makushin. However, while testing of these sites have indicated great potential for geothermal, no production has taken place as of yet. Operationally, electrical generation from high heat geothermal sources works exactly like any other boiler system electrical generation. The ground heat is used to boil water that produces steam to Geothermal generators at Chena Hot Springs Photo courtesy of Chena Hot Springs Geothermal Project The pump and generator unit for the Chena Hot Springs geothermal power plant Photo from the Chena Power Report to AEA (2007) Sustainable Energy Opportunities: Best Practices for Alaska Tribes Page 34

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