Offshore wind energy can help the nation reduce its greenhouse gas emissions, diversify its energy supply, provide cost-competitive electricity to key coastal regions, and stimulate revitalisation of key sectors of the economy by investing in infrastructure and creating skilled jobs. Key challenges to the development and deployment of offshore wind technology include the relatively high cost of energy, technical challenges surrounding installation and grid interconnection, and permitting challenges related to the lack of site data and lack of experience with permitting processes for projects in both federal and state waters. This book outlines the actions the U.S. Department of Energy will pursue to support the development of a world-class offshore wind industry and explores initiatives to promote and accelerate responsible commercial offshore wind development in the United States.