Go with the flow: Scientists design new grid batteries for renewable energy

How do you store renewable energy so it's there when you need it, even when the sun isn't shining or the wind isn't blowing? Giant batteries designed for the electrical grid -- called flow batteries, which store electricity in tanks of liquid electrolyte -- could be the answer, but so far utilities have yet to find a cost-effective battery that can reliably power throusands of homes throughout a lifecycle of 10 to 20 yeas. [Readmore]