The high-performance power system (HIPPS) developed by Foster Wheeler Development Corporation (FWDC) uses a pyrolyzer to convert coal into fuel gas and char. The fuel gas is fired in a gas-turbine topping combustor and char, together with the supplemental coal, is burned in a high-temperature advanced furnace (HITAF) to heat air and generate steam in a combined-cycle arrangement. Systems of this type are capable of 47% efficiency (HHV) and meet stringent emissions limits. Concurrent with HIPPS development, a repowering application derived from the concept is presently under study. An existing 94 MW, coal-fired boiler plant was chosen for this study to increase plant efficiency and capacity without requiring natural gas or complete gasification of coal. Due considerations for repowering with HIPPS were given to the gas turbine selection, boiler modifications, cycle configuration and system integration. To conduct the overall cycle analysis and trade-off studies, performance simulation models with repowering modifications were set up for this plant. The effects of the modifications on the plant performance were evaluated with the models and a well-integrated repowering configuration was achieved.