Gone, is the old boring dull grey box look and in comes bright and vivid colors and designs that excite.

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It might not look full of promise but a lot of hope is hanging on a big grey box at a Cornwall wind farm.

BBC: Roscrow wind farm tests strain of green energy on power grid

Along with the rest of the equipment loaded into the back and strapped on to the roof of the ambulance, there is one modest-looking grey box.

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If the trials of the grey box prove successful, it will allow new renewable energy plants such as the farm in Roscrow to connect without the need for expensive grid reinforcement, said Roger Hey of WPD's Future Networks team.

BBC: Roscrow wind farm tests strain of green energy on power grid