In April 2008, Mitsubishi Heavy Industries, Ltd. (MHI) established Sustainable Energy & Environment Strategic Planning Department. As energy- and environment-related products currently account for more than 60% of MHI sales, the Department plays an important role in comprehensively managing such products, taking the lead in new developments through the integration of products and related technologies, offering solution-oriented services to clients, and introducing new products and services to the market. This article describes MHI's mid- to long-term prospects and various developments and projects as related to energy and the environment, as well as MHI's vision for a future society.