This document summarizes meteorological and oceanographic conditions relevant to marine renewable energy projects. It discusses available test site facilities for measuring tidal currents, waves, wind, and water and air properties. The document also outlines design loads, marine operations and maintenance, environmental impacts on birds, marine life and materials, and corrosion and abrasion risks. Finally, it lists several collaborative research projects between industry and research centers focused on improving understanding of the marine environment, technologies, energy conversion and transmission, and safety and operations of marine renewable energy projects.