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The Town of Lakeview retained Anderson Engineering & Surveying, Inc. to determine if low temperature geothermal power generation was feasible at the Town’s North Geothermal Production Well. This report reviews alternatives and costs for generating power using the Town’s low temperature geothermal resource. Background Geothermal water has been part of the Lakeview landscape since the beginning of the Town. Natural hot springs exist just south and north of Lakeview. Development of the resource has been limited to mostly space heating with limited success and use. A power generation project was started in the early 1980’s but was not successful due to lack of foresight on disposal of the spent geothermal fluid, inadequate allowance for cooling water, and limited capital. Most of the past geothermal projects were done without adequate technical involvement. A space heating project, developed in 2005, with the Town of Lakeview and the Oregon State Correctional Facility has been very successful with the facility saving $80,000 to $100,000 per year in energy costs. With the increasing cost of energy, power generation is the next viable project to utilize the resource available to Lakeview. The Town of Lakeview drilled a geothermal production well in cooperation with the Oregon Department of Corrections in 2004. This well (Oregon Water Resources Log #51612) produces 206° water and is currently supplying the Warner Creek Correctional Facility with geothermal heat. Operation of this well is under Oregon Water Resources Permit Number G-15557, which allows a use of 300 gallons per minute (gpm). After the geothermal water is used for heating, the water is re-injected back into the aquifer via a re-injection well (Oregon Water Resources Log #52423). Please refer to the Site Plan in the Appendix showing the layout of the North Geothermal Production Well. The current heating demand at the correctional facility is 30 to 40% (based on flow) of the well’s geothermal capacity with an approximate average of 2 million BTU’s (British Thermal Units – The amount of heat to raise 1 pound of water 1 degree) per hour with peak loads of up to 4 million BTU’s per hour. In addition, a good possibility exists that power generation could occur before sending the geothermal water to the correctional facility making dual use of the water prior to re-injection. If water temperatures are reduced to an average of 150° after the electrical generation processes, it could still provide nearly 7 million BTU per hour at the 300 gpm flow as per the well permit. While this use is technically viable, the compatibility of the correctional facility equipment needs to be considered if the project moves forward to design. The prison heating system was designed for temperatures well above the effluent from the power plant. Experience with the existing system, however, indicates that it operates well below design capacity under most conditions. Evaluation of the heating system with respect to capacity under the power plant operating mode will be a key task in the course of project development. Multiple uses of the geothermal water are possible and sustainable. Lakeview Geothermal Power Generation Facility Feasibility Study 1PDF Image | LAKEVIEW GEOTHERMAL POWER GENERATION FACILITY FEASIBILITY
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