MIT’s flow battery could store solar and wind power on the cheap

Previous membraneless systems have been largely unpractical, but the scaled-up version of the device could have a substantial real-word impact because it could be used to produce energy for a very competitive US$100 per kilowatt-hour. “Most systems are easily an order of magnitude higher, and no one’s ever built anything at that price,” says William Braff, who was part of the research team.