Question

To ask the Secretary of State for Energy and Climate Change, how many customers are on the standard tariffs of each of the Big Six energy suppliers; and in each case what the proportion of those customers are of the suppliers' total customers.

Around 71 per cent of standard electricity customers, supplied by one of the big six, are on standard tariffs. This equates to around 17.7 million customers.

For those supplied by one of the big six for gas, around 70 per cent of customers are on standard tariffs. This equates to around 14.1 million customers.

We publish the proportion of fixed tariffs in tables 2.4.2 and 2.5.2 as part of our quarterly energy prices publication (QEP). This can be found here:

https://www.gov.uk/government/collections/domestic-energy-prices

The data used to produce these figures has been provided to us in confidence, therefore we cannot provide these estimates for each of the individual big six companies.