Ofgem has opened an investigation into whether Extra Energy broke rules relating to billing, customer service and complaints handling.

Citizens Advice raised concerns with Ofgem in March relating to a high level of complaints against Extra Energy, particularly around billing. It ­provided evidence from the ­Consumer Service and Extra Help Unit. The ­Ombudsman Service also raised concerns with Ofgem in April relating to Extra Energy’s ability to complete ­remedies within the required ­timescales.