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Tung Ho Steel Enterprise is the Taiwanese company where a real uninterrupted route has been established between the operations of an electric steelworks with continuous caster and those of a rolling mill. Limitations of energy losses, fuel-oil consumption, and emissions of pollutants in the atmosphere demonstrate Tung Ho concern for reducing carbon footprint and taking care of the environment. The use of advanced casting technologies together with an induction furnace allowed the exploitation of direct charging of hot billets and sets an unprecedented example on how to lower both CAPEX and OPEX costs while fulfilling ecologically sustainable industrial concepts. This paper presents an overview of the plant and the different technological areas to examine then in detail the core technological concept of the direct link between caster and rolling mill and the related considerable advantages in terms of reduction of energy requirement and emissions. The Tung Ho Minimill started commercial operation in summer of 2010. The mill achieved the Tung Ho team expectations and the innovative concept was therefore proven to be commercially viable. Operation of the SMS Concast INVEX System together with on-demand reheating with the SMS Elotherm induction furnace minimizes energy consumption and waste since the heating parameters are tightly related to the incoming temperature and only the required energy is added to the product. The system provides excellent temperature uniformity and consistency, both along the billet and between billets, allowing for a much more stable and predictable rolling process. This modern facility demonstrates that an environmentally conscious and energy efficient approach can also result in a considerable reduction of investment and operating costs.