Key terms and issues explained

Mae’r dudalen yma ar gael yn Gymraeg.

On this page you will find a range of key terms explained for business energy. Please click on a letter below to be taken to a list of terms and on "show" to read the explanation.

Large energy suppliers (Big Six)

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.

Low user

A consumer who annually uses 2.100 kWh of electricity and/or 11.000 kWh of gas.

Loyalty discount

A discount that is paid at a pre-specified point in time if the consumer does not switch energy suppliers.