LAKEVIEW GEOTHERMAL POWER GENERATION FACILITY FEASIBILITY

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LAKEVIEW GEOTHERMAL POWER GENERATION FACILITY FEASIBILITY ( lakeview-geothermal-power-generation-facility-feasibility )

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The Town’s North Well could provide the cooling water for this option. The well was constructed in 1998 and designed with screens. Initial pumping tests during well construction by Anderson Engineering and Surveying, Inc. showed up to 585 gpm with a continuous test done at 400 gpm. An analysis of the original pumping tests show the well has a transmissitivity capacity of 1980 square feet per day with a well efficiency of 91%. This is excellent efficiency so pumping rates of 700 gpm should be available at increased well drawdown. Additional analysis of these tests by Dale Bugenig, hydro-geologist, of Eco:Logic in Reno, Nevada using a continuous pumping rate of 700 gpm resulted in a drawdown of 192’ below land surface allowing 22’ for seasonal interference from other wells. This analysis assumed no recharge or re-injection back into the aquifer of the used water. This is within the well capacity as the screens and water bearing strata used are at 222’ below land surface. If 230 gpm is diverted after cooling the generator to the proposed biomass plant, this leaves an amount of 470 gpm of water for reuse. Some agreements may be possible with irrigators in the vicinity to use the water and reduce the demand on their existing wells. However, this would take piping and would only be viable in the summer months. Re- injection of the remaining water is the only viable alternative as the water will recharge the aquifer in the well vicinity and result in only a 230 gpm net use of groundwater for the project. Re-injection is possible on the Town’s property near the area of Rabbit Hills Road and Geyser View Lane. Re-injection will greatly reduce the drawdown in the well at the 700 gpm pumping requirement to approximately 92 feet below land surface with the net water demand on the aquifer of 230 gpm. Re-injection will allow the aquifer to reach a steady state. This will also reduce pumping costs and require a minimum of return piping from the generator site to the re-injection well site. A re-injection well will require additional up-front capital cost. Using the existing re- injection well and mixing the cold and hot water is not advisable. Maintenance on a properly designed re-injection well will be minor cost factor over the life of the project. A comparative analysis of costs is covered in the Appendix under Profit (Loss) Calculations. Power Sales The project has the source wells, cooling water piping to the generator site, a cooling water source, and adequate property for the related improvements. All that remains is to sell the generated power. Two power providers are available to the Town; Surprise Valley Electric, located in Alturas, California (a rural cooperative), and PacifiCorp of Portland, Oregon. PacifiCorp’s service area is located east of the Rabbit Hills Road while Surprise Valley Electric’s service is west of the area. Lakeview Geothermal Power Generation Facility Feasibility Study 13

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