Wind, coal, solar, gas, wave, oil, nuclear – there are numerous sources of energy within the UK and yet still 61% of our electricity generation is from imported fuels. Does it matter where it comes from? What are the pros and cons of choosing one over another? How do you guarantee the electricity coming down your wire is from the source you choose? Juliet Davenport is the CEO of Good Energy, James Luger is Ofgem's Senior Manager for Sustainable Development, Consumers & Sustainability and Chris Blake is the founding director of TGV Hydro. They talk to Hay on Earth Director Andy Fryers.