Midrex designs greenfield plants based on MIDREX H2 technology specifically for 100% hydrogen operation or for majority hydrogen operation with minimal natural gas usage.  This technology is based on the proven MIDREX Shaft Furnace and process gas systems that already operate at large scale (2.5 Mt/y) and with ~55-75% H2 in reducing gas.  The configuration includes the latest innovation from Midrex, an electric heater for the recirculating hydrogen gas designed and supplied in partnership with the Tutco SureHeat business of Flex-Tek Group, a division of the UK-based engineering company Smiths Group plc.