Our first collection of solar futures, The Weight of Light, puts comparative design at the heart of the solar project. What if we build big? What if we build small? What if we build solar in cities? What if we build solar in rural hinterlands? These and a host of other design variables (the full list includes scale, geography, aesthetics, abundance, ownership, governance, storage, supply chains, and waste) informed a tour of diverse futures in captivating stories by Cat Rambo, Corey S. Pressman, Andrew Dana Hudson, and Brenda Cooper, compelling artwork, and reflective essays by leading photovoltaics researchers from the Quantum Energy and Sustainable Solar Technologies Engineering Research Center and the School for the Future of Innovation and Society. Just how different might solar-powered futures be?