Over a million UK energy customers who switched providers overcharged
Ovo and Shell were identified as the worst offenders.
More than a million UK energy customers that switched providers could have been overcharged due to errors made by suppliers.
According to Ofgem, the sector’s biggest suppliers made mistakes, including Ovo Energy, Shell, British Gas, E.On, EDF, Npower, Scottish Power, SSE and Octopus.
Ovo and Shell were identified as the worst offenders.