Abstract: A chemical-looping combustion system is provided in which an oxygen carrier, for example a metallic oxide or peroxide, is used for fuel combustion and produces carbon dioxide and water as by-products. The system delivers steam and CO2 at for direct utilization by steam cycle power generation equipment and heat exchangers. After fuel combustion, the oxygen-poor carrier is regenerated by exposure to air in a second, sequestered reactor. Choice of oxygen-carrier material and conditions allows for the fuel oxidizer reactor to run at temperatures greater than the running temperature of the regenerator reactor.