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10. 700 kW Magnetic Bearing Turbine/Generator Module The concept of building a module that would utilize two magnetic bearing turbine / generators arose when it was learned that the standard size 400 kW magnetic motor‐generator could only be rated to operate at 350 kW in the mode we are considering. For this reason, and recognizing that there is an adequate geothermal resource available to operate a power plant at 700 kW, this option had the potential of being cost effective. The idea behind implementing the magnetic bearing turbine / generator is that it would increase efficiency and decrease operating cost. A potential improvement to the current state of the art for this technology by the proposed plan is that the high speed generator would eliminating the need for a gear box, reducing lubricating oil use and long‐term maintenance costs. This module would also be designed to operate at part load conditions when only a portion of the geothermal water supply is available. Since the UTC unit only operates when there is a full supply of geothermal heat available, there are periods when the plant would have to be shut down, even though there may be a partial supply of geothermal heat available. The investigators learned that the turbine‐generator would require a custom designed and constructed turbine wheel which added significantly to the total estimated cost of the proposed module. As a result, the proposed 700 kW project became too expensive to be attractive to the City. The preliminary capital cost estimate totals about $2.64 million. Brian Brown Engineering estimated the annual net power production to be in the range of 3,700 megawatt‐hours per year. The first year annual revenue is estimated at $194,000. 10a. Capital Cost for a 700 kW Magnetic Bearing Turbine/Generator Module A preliminary estimate of the cost to develop and construct the project with the two magnetic bearing turbine / generators has been completed. These costs include the permitting, engineering and contract applications and negotiations necessary to place the system in service. A summary of these costs is presented below. _________________________________________________________________________________________________________ City of Klamath Falls Evergreen Energy & Brown Engineering Geothermal Power Plant Feasibility Study July 2011 Page 24PDF Image | Klamath Falls, Oregon Geothermal Power Plant Feasibility Study
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