Cost-Effectiveness of Distributed Generation Technologies

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Cost-Effectiveness of Distributed Generation Technologies ( cost-effectiveness-distributed-generation-technologies )

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Cost-Effectiveness of Distributed Generation Technologies Net Capacity Factor Capacity factor compares the plant's actual production over a given period of time with the amount of power the plant would have produced if it had run at full capacity for the same amount of time. Capacity factor is expressed by the following equation: The SGIP Impact Evaluation Reports from 2006-2008 reported an average annual capacity factor of approximately 75% for gas turbine technologies. Waste Heat Recovery Due to the small number of gas turbine applications under the SGIP, there is limited information on metered useful waste heat recovery. Table A-16 provides a summary of the measured useful waste heat recovery from gas turbines operating in the SGIP during calendar year 2009. The values represent the observed useful waste heat recovery in units of thousands of Btu per kilowatt-hour of generated electricity (kBtu/kWh). Using an average electrical efficiency for gas turbines of approximately 31% and the CPUC requirement of at least 60% overall efficiency, gas turbines were assumed to have the ability to recover 2.79 kBtu of useful waste heat per kWh of generated electricity for the purposes of this study,. Table A-16: Useful Waste Heat Recovery from SGIP Gas Turbines (2009) 2009 3 2.07 5.88 3.92 3.06 Air Pollution Emissions Gas turbines are among the cleanest fossil-fueled power generation equipment available. However, turbine operating load will have a significant effect on emissions level of NOx, CO, and VOCs. Although maximum efficiency and optimum combustion is achieved at higher loads, NOx emissions are also higher. Lower loads will produce more incomplete combustion, resulting in higher emissions of CO and VOCs. The EPA compared emissions of typical gas Metered Sites Waste Heat Recovery (kBtu/kWh) Year n min max mean Capacity Weighted Average Itron, Inc. Appendix A-31 DG Technologies

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