By Paul Rincon, Science editor, BBC News website

US researchers have made an important step forward in the quest to store electricity from intermittent energy sources such as wind and solar.

A Harvard University team came up with a way to drive down the cost of flow battery technology, which is capable of storing energy on large scales – within an electrical power grid, for example. Grid-scale storage for renewables could be a game-changer – making wind and solar more economical and reliable.

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http://www.bbc.co.uk/news/science-environment-25674738