Renewable energy. In one hour we get enough sunlight on the earth to power the planet for a year. The molecular design of new materials for efficient harvesting of photons from the sun is promising. But storing that energy requires the next generation of batteries: sustainable, safe, and high-energy. Alan Heeger, Lon Bell and Jean-Marie Tarason explore new ways to meet our energy needs. Series: "Institute for Energy Efficiency" [Science] [Show ID: 17378]