Large energy suppliers (Big Six)

Mae’r dudalen yma ar gael yn Gymraeg.

The large energy suppliers (often also called the 'Big Six') are the companies that hold supply licences and supply most of the energy to domestic households in the GB market. They are:

Centrica plc (parent company of British Gas), E.ON UK, Scottish and Southern Energy (SSE), RWE npower, EDF Energy and ScottishPower.