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GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY

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GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY ( great-neck-water-pollution-control-district-nassau-county-ne )

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separate stream of CO2 at a rate of 80 kg/s. The CO2 stream is 99.5% pure and is sent to the EGS for use as a heat transfer working fluid. Environmental Considerations: The proposed project will minimize its impact on the local environment and residents through careful planning. The IGCC plant contains and processes the emissions that are commonly associated with coal-based power plants (CO2, NOx, SOx and water) will be much reduced and turned into a resource. Potential impacts related to the EGS are subsidence, ground water contamination and induced seismicity. At the planned 3.5 to 5 km depth of the EGS reservoir ground water contamination is minimized if proper well construction procedures are followed. Due to the injection rates and close proximity of the proposed site to the city of Albuquerque induced seismicity may become an issue. This issue may only be addressed as the injection scheme is tuned, potentially involving reduced flow rates and alternating injectors and withdrawal wells as the response of the reservoir rocks is observed. This plant will save emissions of 8,200 tons of NOx, 20,000 tons of SO2 and 4.35 million tons of CO2 emissions over one year compared to a conventional fossil fuel power plant. Economic Considerations: An economic analysis for the combined scCO2-EGS-IGCC system determines the Net Present Value (NPV) of the overall system and established probable payback periods based on the cost of electricity, possible electricity inflation rates, and the possibility of governmental funding for carbon capture and storage (CCS). The total capital cost and operational costs for the combined systems are $1.7 billion (IGCC) and $190 million (EGS), respectively. The assessment estimates that in the worst-case scenario (no increase in electricity prices and absent government funds to subsidize CCS) the system will pay for itself in its 8th year of operation. In this case the final present worth of the project over the 30 year lifetime would be $3 billion and have an Return on Investment (ROI) of 91%. The best-case scenario results in a Payback Time (PBT) of 6 years, a $5.5 billion total present worth over 30 years, and an ROI of 223%. These results of the economic assessment show that the project is a worthwhile investment. Further investigation of costs and benefits associated with both portions of the project would serve to reinforce the findings and provide a more accurate estimation of the outcome of the project. Social and Cultural Considerations: For this proposed plant to become a good neighbor to the city of Albuquerque it must fit into the city‘s long term goals. Specifically, Albuquerque is molding itself into a growing city and tourist destination that supports industries with minimal visual impacts and with an ethos for the conservation of water and the environment. The minimized and symbiotic outputs of the scCO2-IGCC plant also fit these environmental ethics. It is feasible for the aesthetic and environmental impact of the proposed plant to also satisfy this goal of minimal visual and environmental impact but it must be designed this way from the start. To address water use, the power plant will operate solely on gray water and produced water from the geothermal field. iii

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