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Noise: major source would be in initial construction and large vehicle trips to geothermal well sites. Helicopter visits might be required based on location. The nominal noise from the turbines can be offset with a muffler system. Disturbances to Fish and Wildlife: Facility should mitigate operations in order to minimize impact to the surrounding wildlife and habitat. Concerns could come from thermal water discharge or issues during the construction phase. Under ADNR Mitigation Measure 1.a., the plan of operations must describe the lessee’s efforts to minimize impacts on residential, commercial, and recreational areas. Mitigation Measure 1.b. requires lessees to minimize sight and sound impacts for new facilities sited in areas of high commercial, recreational, and subsistence use and important wildlife habitat. (ADNR DOG, 2008) Cost There are certain project elements that can have considerable impact in the cost, time and feasibility of a geothermal power plant. Elements such as exploration depth, access to site, lease cost and lag time, competition for drill rigs, and many other geographical and financial issues. (Appendix) The table to the right describes the economics of a 50MW geothermal generating station located on federal land over a 30‐year time span. The major costs of a project include exploration and resource assessment, drilling, plant & transmission construction, and other costs developmental costs such as general permitting fees and working capital. These numbers can vary from site to site based on site location and geology. (Insert table) Typical Geothermal Power Plant Development Costs Development Stage Exploration and resource assessment Well field drilling and development Power plant, surface facilities and transmission Other development costs (fees, working capital, and contingency) Total development cost Cost ($/kW) $400 $1,000 $2,000 $600 $4,000 Source: GEA, 2008 Considering all of these factors, exploration is estimated to cost $100 ‐ 200 / kWh. Exploration for the typical 50 MW geothermal power plant will thus cost between $5 and $10 million, with costs rising as the cost of steel increases. (GEA, 2008) HDL Engineering‐ Geothermal Cost Matrix (produced as a memorandum for AEA) This assessment focuses on the major costs of the establishing a geothermal energy facility in multiple sites throughout the state of Alaska. The report has created a matrix format comparison chart of these sites and their major characteristics. Sitka’s Goddard Springs is the example site in the report. The island also has the resources of Mt Edgecombe along with Baranov Hot Springs. (HDL, 2009) (Appendix) Funding Recovery Act: Geothermal Technologies Program (DOE) Helps fund exploration and innovation for geothermal energy. Goal is to reduce the high risks in the early stages of geothermal technology research and implementation. For more information follow the link: http://www.grants.gov/search/search.do?mode=VIEW&flag2006=false&oppId=47584PDF Image | COMPREHENSIVE RENEWABLE ENERGY FEASIBILITY STUDY Sitka
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