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Researchers at the HeidelbergCement Technology Center recently discovered that ternesite - so far assumed to be almost inert - actually is a reactive clinker phase. This discovery forms the core of a new innovative low-carbon clinker technology. The belite-calciumsulfoaluminate-ternesite (BCT) technology combines the early age strength contribution of calciumsulfoaluminate (CSA) cements with the durability of belite cements and whereby ternesite in this system bridges the reactivity gap between the very fast aluminates reaction and the late strength contribution of belite. Due to the lower calcium content and the lower burning temperature of around 1 250 to 1300°C, CO2-emissions of BCT clinker are around 30 % lower than from conventional ordinary portland cement (OPC) clinker. In addition savings of 10 to 15% in fuel consumption and electrical energy demand are expected. First results of mortar testing of cements produced at semi-industrial scale illustrate the good performance and high potential of this technology. As next steps, up-scaling and optimization of the manufacturing technology to industrial dimensions are foreseen. In parallel the development of a BCT-based concrete technology and the evaluation and optimization of concrete durability will be conducted. [ABSTRACT FROM AUTHOR]