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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 3. RESOURCE EVALUATION The Chena hot springs are located on the floor of Monument Creek Valley at an elevation of approximately 1170ft. Chena is one of approximately 30 low to moderate temperature geothermal systems located in interior Alaska, between the Alaska and Brooks Mountain Ranges (Figure 2). This belt of thermal springs extends approximately 2000 miles from the Seward Peninsula on the west into the Yukon Territory in Canada on the east. Most of these thermal springs in this belt are found within or near the margins of granitic plutons, which can have anomalously high concentrations of radioactive elements. It has been postulated that the hot springs exist due to a combination of high local heat gradients from radiogenic decay in the granitic rock combined with vertical fracturing which allows for deep hydrothermal circulation. Two geologic and geophysical studies of Chena Hot Springs were conducted in the 1970’s and 80’s, both through the University of Alaska, Fairbanks. The first was a Master’s thesis by Norma Biggar et al, and the second was a more comprehensive study in 1981 conducted by the Geophysical Institute under the direction of Gene Wescott and Don Turner. Both of these reports, along with additional historic publications cataloging Alaskan hot springs resources were used as baselines for the 2005-06 Chena GRED III resource evaluation5. Unlike previous resource evaluations of Chena Hot Springs, the GRED III project was specifically designed to assess the resource for power generation. The stated goal of the project was to determine if the Chena resource was large enough to sustainably generate 10MW of power, which was the amount of generating capacity required to justify the costs of a 33 mile transmission line extension to bring the power to markets in Fairbanks. Under the GRED III project, extensive geologic and geophysical surveys were conducted using both airborne and ground based techniques. Additionally, a series of temperature gradient holes were drilled to directly access the shallow reservoir and determine its relationship to the deeper geothermal system. These holes, drilled to depths of up to 1020ft, permitted extensive logging and testing of the shallow geothermal resource. This information was extremely useful in siting a production well for the power plant, and subsequently in developing an injection strategy. A sample of static temperature logs from most wells at Chena Hot Springs is included as Figure 3. Based on heat flow estimates and history of geothermal development at other sites, it was determined that Chena Hot Springs could likely sustain 5MW of electric generation (Figure 4). This is well above the 400kW installed under the scope of this project. However, initial flow testing did indicate the necessity to reinject produced water to maintain shallow reservoir pressures and minimize impact to the natural thermal springs. 5 The Chena GRED III Project was funded by the Department of Energy and Chena Hot Springs Resort and titled ‘Integrated Geoscience Investigation and Geothermal Exploration at Chena Hot Springs, Alaska.’ 7PDF Image | 400kW Geothermal Power Plant at Chena Hot Springs
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