* At least 10% of customers who used energyhelpline to switch their gas and electricity between 1 March 2010 - 7 March 2011 saved £453 a year or more. During the last round of energy price rises (Nov 2010 - Mar 2011), where prices rose by 5.9% on average across the big six suppliers, energyhelpline customers have saved on average 19% switching their energy.