I think someone was asking this a day or so ago on this site. I`m with Southern Electric and I went onto a comparison site a while ago because I thought I might get a better deal. The result was that Southern Electric was the best for me. I have heard though, that British Gas are expensive.
depends where you live, I think, here in Soth Wales it seems that EDF Energy are the best bet, as long as you do the online deal, seems really good!........rang the Energyline helpline, but if you've capped the price with British Gas since 2009 till Sept 2011, then not sure what to do yet!............
Oh forgot to say that, if you switch to EDF they gaurantee to keep thier prices below the other leading companies, and give you £100 credit to you t Electricity account as a gift for joiining them!...........Worth a look!.............Was with Energyline, they say that if you make the change online yourself, then you may not get such good a deal!.....so might be worth calling them!............