What is the future of sustainable energy? Why solar, and what about batteries?
TL;DRSolar: the sun rounds up to 100% of all energy, so it's really all about the sun. Batteries: lithium-ion still has room, about 8% better a year, which halves cost in four or five years.As of Jan 2026
ALSOWhat's the next battery technology after lithium-ion? Lithium-ion hasn't hit its ceiling. Steady improvement of about 8% a year compounds into big cost cuts. “the sort of average Improvement per year is about 8%” (Elon Musk: Inventing the Future with the Los Angeles World Affairs Council @ 34:00, Dec 4, 2013)