The Grid Integration of Solar Energy Workshop on October 29, 2015 identified critical challenges and opportunities associated with integrating hundreds of gigawatts of solar energy into the electric grid, assessed state of the art technologies, and proposed a set of solutions that will address near- and long-term research and development needs. Participants included experts in the areas of power systems, controls, communications, data analytics, and sensors from academia, industry, government, electric utilities, and national laboratories. The SunShot team collected ideas, opinions, and comments from this workshop that will serve as valuable inputs to the development of research roadmaps and potential future funding opportunities.