This is the first electric indirect arc furnace to produce steel. It transforms electrical energy into thermal energy. The material in the furnace heats up, melts or is transformed thanks to the heat given off by a number of electrodes. This furnace used scrap metal instead of iron ores, obtaining high quality steel with great economic, environmental and social benefits. Invented in 1898, it won the prize "Milestone in the development of metallurgy" in 1992.