Who's Who

E.ON UK is a leading energy company in the UK. They are the second largest electricity generator in the UK and  own the second largest distribution network in the UK. They are part of E.ON; the world's largest investor-owned power and gas company, which has its headquarters in Germany. E.ON appeared in the UK following the takeover of Powergen in January 2002.

British Gas is a British-owned company. As part of the Centrica Group, they provide gas electricity and home repair services to millions of customersin Scotland, Wales and England.
  

The company was originally part of National Power, one of the generating companies created from the break-up of the CEGB. In 2000 National Power went on to split into two separate companies; Innogy, which included the UK based operations such as the Npower supply business and International Power which included the international operations of National Power.

Innogy then went on to purchase the Regional Electricity Company Yorkshire Electricity in 2000. It later disposed of the distribution side of Yorkshire Electric to CE Electric UK in exchange for the supply business of Northern Electric. Innogy itself was taken over by the German utility giant RWE in 2002 and renamed RWE Npower plc with all the supply business adopting the "Npower" brand.

EdF (Electricité de France) is the French state owned electricity company, and the group supplies gas and electricity to the whole of the UK. EdF has grown by buying a number of UK energy brands including London Energy, Seeboard Energy, Sweb Energy and Virgin Energy