The 2017 Offshore Wind Technologies Market Update was developed by NREL for DOE's Office of Energy Efficiency and Renewable Energy, Wind Energy Technologies Office. This update complements the biennial Offshore Wind Technologies Market Report(Musial et al. 2017), which includes a more detailed discussion of the key trends and statistics included in this update. This work provides decision-makers, regulators, developers, financiers, and supply chain participants with quantitative information about the offshore wind market, technology, and cost status worldwide and in the United States.