EDF Energy provides energy to around six million homes and is the UK’s largest provider of low-carbon electricity. You might also know the company as its previous brands; SEEBOARD, SWEB energy & London Electricity.EDF has a French parent company the EDF Group.
npower supplies five million UK homes with gas and electricity. It previously operated under the brand names Innogy, Northern Electric and Yorkshire Electricity.
Scottish Power also provides energy to five million homes in the UK. It started as Clyde Valley Electrical Power Company, then became SSEB (South of Scotland Electricity Board), and now is owned by Spanish energy firm Iberdrola.