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Geothermal and Hydroelectric Energy in Iceland and Alaska

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Geothermal and Hydroelectric Energy in Iceland and Alaska ( geothermal-and-hydroelectric-energy-iceland-and-alaska )

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Current Geothermal Activity in Alaska There is currently only one commercial scale geothermal power plant in the state, but there are many potential projects. The four areas with potential geothermal resources are the Aleutian Volcanic Arc (AVA), Central Alaskan Hot Springs Belt (CAHSB), Wrangell Volcanic Cluster (WVC) and the Alaskan Panhandle. In 2008, the US Geological Survey (USGS) reported that in the next 30 years, Alaska has a mean probability of geothermal electrical power generation at 677 megawatts (MW). The AVA holds the most potential for power generation, but faces many of the same difficulties that other geothermal resources face. The problem with many of these potential developments is that they are not located in populated areas that need the power. Transmission over harsh landscapes and long distances is both difficult and expensive. Currently, Chena Hot Springs is the only operating power plant, but there are other projects that are trying to assess the value of potential resources. Current Projects: Chena Hot Springs Chena is the only successful case of geothermal development in Alaska. Chena is located 60 miles northeast of Fairbanks. In 2004, the resort partnered with United Technologies Corporation to develop two 200 kilowatt (kW) geothermal power generators. This is enough energy to support the resort as well as 6,000 square feet of greenhouse space, which is the only year-round greenhouse in the interior or northern parts of Alaska. Chena is also the lowest temperature geothermal resource that is used for commercial power generation in the world. This power generation is accomplished using a binary system with a refrigerant that has a lower boiling point than water. The temperature of the water is 165°F and flows at 500 gallons per minute. The project was helped through funding from the Denali Commission and has reduced energy cost from 30¢/ kilowatt hours (kWh) to around 5¢/kWh. Part of what has made Chena successful is that the location and application were correct. Chena Hot Springs Resort is located right over the geothermal source and enough energy is produced to power the resort. Potential Projects: Potential geothermal projects fall into two categories, possible and theoretical. Projects in Akutan and Pilgrim Hot Springs have been and are continuing to be explored and are much closer to actual development. The other projects in this section are more theoretical. There is geothermal activity, however, little is known about the resources and development is much farther away. Map 1 below highlights the area with potential geothermal resources within the state. 4

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