Green energy champions, Simply Energy, offers a one-stop advice service on:

• the cheapest electricity and gas supplier(s) for your postcode area
• the cheapest suppliers of Green electricity (i.e. from renewable energy sources) for your postcode area
• switching to 100% Green electricity, if appropriate, by signing up with Good Energy

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For further information call 0800 068 7188. If you opt for Good Energy despite it being a little more expensive, but then offset that increased cost by switching to the cheaper gas supplier Simply Energy will also find for you, Tree Spirit will plant a tree on your behalf, another individual contribution towards reducing global warming (depending on the species of tree).