Ottery St Mary residents who've made their homes more energy-efficient are offering to show members of the public how they did it this weekend.
They're opening their doors to show off sustainable power generators including solar panels and ground source heat pumps, and energy monitors which feed information to their PCs.
Further environmental activities will take place during the week, including a visit to Bicton Earth and an exhibition where visitors can see an eco-house under construction, and a car powered by vegetable oil.
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