Several teams of large companies in the United States are developing a coal-fired high performance system, also called HIPPS. In this combined cycle plant, a fluid bed air-blown pyrolyzer converts coal into fuel gas and char. The char is fired in a high temperature advanced furnace, which heats up both air for a gas turbine and steam for a steam turbine. The air is heated to 1400°F. The gas turbine combustor raises the air temperature to 2350°F and generates power in the gas turbine. High pressure steam is also generated in the HRSG .