We pay approx £750 per year for all energy we are with EDF. This house is easy to keep warm, I guess that comes from living in a single storey. We are well insulated and have energy saving light bulbs and appliances and I can't even say I'm frugal with my usage. Will be interesting to see what difference it makes. OH has just had a wage rise, so I'm thinking that will wipe it out but we'll see.
I guess the people who have invested in eco housing will be ok, not sure about the ones with ground source heat things. We have a friend who bought a new build with this in place, runs solely on electric and he said it was costing a fortune!
There is a lot to be said for being part of a group, and the support and friendship that is gained from this.