As the technology behind renewable energy continues to advance, recent research finds that the public sector plays an important role in catalyzing innovation. This can be seen in three main ways: by funding basic research on renewable energy in all 50 states; by partnering with cleantech startups; and by supporting cleantech clusters through networks, commercialization assistance, and access to capital. Taken together, this recent research suggests that public-sector partnerships can complement industry’s role in growing the green economy at the federal, state and local levels.