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This report provides a range of statistics and information related to the activities of the Big Five (formerly Big Six) energy suppliers in the United Kingdom (UK), namely British Gas, EDF Energy, E.ON, Scottish Power, and SSE. The group supplies energy services to the majority of the market in the UK.
The term Big Six was regularly used until 2019. When E.ON acquired npower, the group has officially become a Big Five. In addition, SSE's retail business went to OVO Energy. However, for now, the reference to Big Six has been maintained here.