Consumers wishing to switch energy tariffs should do so as soon as possible before a possible price rise.
Mark Todd, director of energy comparison site Energyhelpline.com, warned that there is currently a "bonfire of the best deals".
He noted: "If you're looking to switch, you must act fast as prices are likely to start to rise by late summer, if not before. Customers can fix prices for up to three years, saving themselves hundreds of pounds."
Increases in wholesale energy prices and unrest in the Middle East are fuelling the possible price rises. A 15 per cent hike in gas and electricity prices would add an extra £172.50 to customers' annual bills, Mr Todd added.
The cheapest internet deal from British Gas is £895 a year, while other energy suppliers offer different tariffs.
Make sure you're not paying too much for your energy - compare gas and electricity prices now at energyhelpline.com or call 0800 074 0745