Most cogeneration operations in the steel industry use conventional systems (steam boiler and steam turbines). Integrated steel plants produce significant levels of off-gases (coke oven gas, blast furnace gas, and basic oxygen furnace gas). Specially adapted turbines have been developed that can burn these low-calorific-value gases. Electric arc furnace steelmaking facilities have low demand for steam; about 90% of cogeneration occurs in integrated facilities. The chart below illustrates the energy consumed by establishments using a particular type of cogeneration technology.