One of the things that will help us make the move to renewable sources of energy in the UK is the availability of reliable and cost-effective battery storage. 
Now batteries designed for increasingly popular electric cars are being used to store power for the National Grid. 
The Swedish energy group, Vattenfall, has put this idea into practice on a grand scale. They have installed 500 BMW i3 lithium-ion batteries adapted for stationary operation. The installation is being used to store power from the nearby Pen y Cymoedd onshore wind farm. Power can then be distributed when the grid needs it, reducing the need to use coal-powered stations to deal with peaks in demand. 
Vattenfall Project manager, Nick Entwistle, said: “Installing a battery of this scale, co-located with a wind farm, has been a fascinating electrical engineering challenge.” 
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