The chapter discusses the sustainable transition of banks and the European Sustainable Investment Plan launched by the European Commission, aiming to mobilize €1 trillion for green projects over the next ten years. It outlines the importance of a European taxonomy to classify economically sustainable activities, which will serve as a basis for sustainability-related economic policies. Banks are already active in promoting sustainability by reducing their emissions and adopting new practices of governance and sustainable financing. The chapter emphasizes that technological innovation can facilitate this transition, especially in energy management and emissions. Finally, it highlights the main drivers for the sustainable transformation of banking operations, based on monitoring and improving energy efficiency.