*Save Over £390 - Over 10% of the estimated quotations raised by users of the Simply Switch Website to switch their gas and electricity suppliers between 01/02/2015 - 01/06/2015 produced a predicted annual saving of £390 or more. Current combined spend for gas and electricity of between £84 and £6869. Savings may have included Direct Debit and online discounts. Energy prices vary by usage and postcode.
Retailers Include: AEP Energy , APG&E Energy Solutions , Calpine Energy Solutions , Constellations NewEnergy, INC , Crius Energy , Direct Energy Services LLC , Dynegy , ENGIE Resources , Entrust Energy , IGS Energy , Just Energy , Liberty Power , Next Era Energy Services , Nordic Energy Services, LLC , NRG Energy INC , Source Energy , Spark Energy , Starion Energy , Stream Energy , Talen Energy , TransCanada Power Marketing LTD. 
On the one hand, long-term, fixed-rate (contract) plans offer stability in pricing. If energy supply costs suddenly go up in your area, you won’t be left paying more than what you bargained for. You’ll have peace-of-mind. If you want to switch out of your contract before it ends with a lower cost plan, you’ll likely face a cancellation fee (early termination fee).
If you would rather have a steady rate and not think about twice about starting a load of laundry at 6:30pm versus 7:30pm, Direct Energy’s standard, 12-month, fixed-rate plan Live Brighter runs at an affordable 7.99 cents per kWh. Again, using 1,000 kWh per month would add up to a yearly total of $958.80 — higher than both Free Nights and Free Weekends, but also a lot simpler.
The consumer has the choice between buying from their local utility (Local Distribution Company - LDC) or from one of the deregulated suppliers. There is a large range of contract options from a variable price to 1,3 or 5 year fixed prices. Electricity provider switching is difficult once the consumer is in one of these contracts, unless they are close to the end of a fixed price contract. However, as of January 2010 there is a maximum termination penalty allowed.
It’s worth noting that you can switch for free with no exit fee 42-49 days before the end of your contract. Under Ofgem’s standards of conduct, energy firms have to give you between 42 and 49 days’ notice of your tariff ending. You can use this time to decide whether to stick with them, or switch. If you decide to switch, you won’t be charged an exit fee.