With EDF announcing today that they are increasing gas prices by 22% and elec by 17% I thought it may be worth pointing out there are a couple of live deals at the time of posting that could save you money very quickly and give you a fixed price for a little over 12 months.
There is a stong probibility that all energy companies will now follow edf and up their prices from very quickly. If edf's lead is followed the increase will be in the region of 15-25% now and a chance more will follow later this year. Currently there are fixed or capped rate deals from 3 different suppliers. All are guaranteed until a date in 2009 and are charged at a premium rate above a non-fixed/capped rate (Extra % shown in brackets);
British Gas (10%)
Scottish Power (16%)
(These % figures are approximate so don't flame me for slight innacuracies please!)
While these offers are still open (which may only last for this weekend) existing customers could switch to these deals and chose to pay the 9-16% extra required. However when these companies increase their prices they are very likley to increase by more than 16% for all non-capped/fixed customers. The end result is that you could save money then until the end of your 2009 deal.
So in other words you could be with BG now on a standard rate. Chosing their fixed rate product means you will be chosing a product that's around 10% dearer today but by next week COULD be a bargain if they increase their prices by 15% or more.
Prices vary according to where you live so there's not a 100% method for being accurate on prices for everyone. Don't forget to look at Quidco etc for cashback deals too - some offer as much as £62 for joining them with both fuels if you want to switch from your current provider(s). I'd suggest using moneysupermarket, uswitch, energyhelpline or one of the others to research what the actual cost and best supplier is for you, then see if Quidco or similar have a cash back offer available.
I can't see any other provider currently offers a fixed or capped product that you can now join but if you find one please add it to this thread.
This is likely to be valid for only a short time. Energy companies don't usually withdraw rates over the weekend but come Monday I'd expect some of this post to be out of date.
Note that BG and SP both charge a penalty fee on their current offers if you leave early. Their products are also fixed so if prices come down their rate stays the same. Eon currently don't charge a penalty and it's capped so prices could fall and go back up to the capped rate, but no higher. Eon do have a rate that gives a 'free' energy savings monitor. There is a penalty if you leave that one early.