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This study evaluates the size and cost of a solar aided feedwater heating (SAFWH) system necessary to reduce the emissions of a new coal-fired power plant to 1,400 pounds of carbon dioxide per megawatt-hour of gross electricity (1,400 lb CO 2 /MWh g ) produced by the plant. An Aspen Plus Model was used to determine the efficiency improvements which could be achieved through SAFWH and these results were used to size parabolic trough Concentrating Solar Power (CSP) Systems for three different steam conditions ranging from supercritical to advanced, ultra-supercritical. Thermal energy storage was included in the system to ensure 20–24 hours of the operation per day. Two geographic locations were evaluated in order to evaluate the effects of high and low solar resources. The combined costs of the solar field and the thermal storage system ranged from $30 to $70 million for a next-generation, advanced ultra-supercritical plant to between $119 and $276 million for a supercritical plant. The ranges in costs reflect a difference in solar resource quality at the two locations. More broadly, the results illustrate how increased power plant efficiency can dramatically reduce the size and cost of an SAFWH system required to meet an emissions limit of 1,400 lb CO 2 /MWh g .

Solar Energy and Thermal Storage for CO 2 Emissions Reductions for Coal Power