I told him that I intend to provide a comprehensive response asap, not least because it will help clear things up in my own mind too! This just a 'holding entry' to indicate that I haven't forgotten...Just want to clear up something for myself; I won't support fracking but I don't know enough about it (so generally I stay away from discussing it). However, all the renewable energy sources I know of (wind turbines etc.) are to provide electricity...not gas. So is there a renewable equivalent to gas, or is the aim to move away from gas and convert all gas powered equipment to electricity?
Meanwhile, see The Renewable Gas Mandate blog entry and plenty of further reading on renewable gas in Jo Abbess' blog.