Fuel cells in the home

Today E-on announced it's cutting its gas price .It's the first of the big six energy firms to do so after the government wrote to them at the weekend demanding action. And that's good news for one Black Country home which doesn't just use gas for heating... they use it to run a mini power-station to make their own electricity, saving a third on their energy bills. Could we all be doing the same in the future? Our Science Correspondent David Gregory-Kumar reports
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