The U.S. Department of Energy, Federal Energy Technology Center, is working with private industry to develop the Low Emission Boiler System (LEBS), an advanced coal-fired power generation system for the 21st century. LEBS will provide the utility industry with an opportunity to meet the anticipated increase in electricity demand throughout the world by offering cleaner and more efficient coal-fired power plants. LEES has significantly higher thermal efficiency, superior environmental performance and a lower cost of electricity than conventional coal-fired systems. This paper presents an overall summary of the LEES program.