Sunrun Inc. and National Grid PLC announced a multifaceted partnership that underscores the long-term importance of rooftop solar in the energy resource mix. The partnership includes a joint marketing agreement, a collaborative grid services pilot, and a direct investment by National Grid in Sunrun rooftop solar systems. The joint marketing agreement will leverage both companies' strong brands, with the goal of accelerating the adoption of rooftop solar in a cost-effective, highly scalable way. The program initially targets approximately 100,000 single family homes in National Grid's downstate New York service area.