considers the possibilities of organizing societies and economies around solar energy, and the challenges of a just and equitable transition away from fossil fuels. Far from presenting solarity as a utopian solution to the climate crisis, it critically examines the ambiguous potentials of solarities: plural, situated, and often contradictory. Here, a diverse collective of activists, scholars, and practitioners critically engage a wide range of relationships and orientations to the sun. They consider the material and infrastructural dimensions of solar power, the decolonial and feminist promises of decentralized energy, solarian relations with more-than-human kin, and the problem of oppressive and weaponized solarities. imagines—and demands— possibilities for energy justice in this transition.