The increased cost in home heating recently as EDF Energy and British Gas put up their prices has not been equal across the UK, with some areas seeing bigger increases than others. Both companies claim that costs such as transportation have increased dramatically and in some cases now accounts for around 14% of the average central heating fuel bill. EDF was the first energy company to raise prices on 25th July 2008 when it increased average domestic customer gas prices by 22% and electricity by 17%. British Gas, Britain's largest domestic energy supplier with almost 16 million customers, trumped this at the end of July with a 35% increase for gas and 9% for electricity.