The company has also launched a new product for existing customers – a two-year fixed price deal with no premium against standard new prices and no penalty clause for early exit.

E.ON has guaranteed no more price increases for Age UK Energy customers until at least 13 September 2012.

E.ON energy solutions business managing director Graham Bartlett said with offers like this and by guaranteeing no further increases in the Age UK Energy prices for at least a year, the company gives its customers some certainty in what are very uncertain times.

"And those uncertain times have had a huge effect on wholesale prices, with events in Japan and Libya all having a dramatic effect on gas and power prices in a relatively short period of time," Bartlett said.