Question to the Department for Business, Energy and Industrial Strategy:

To ask the Secretary of State for Business, Energy and Industrial Strategy, how many domestic consumers whose energy was supplied by one of the Big Six suppliers and who were on a standard variable tariff switched tariff (a) with the same supplier and (b) to a new supplier in each of the last three years.

The Department for Business, Energy and Industrial Strategy collect data on the type of tariff which customers are on for the big six energy suppliers as part of our domestic fuels inquiry. We do not collect or hold data for customers and therefore cannot identify how long a customer has been with the same supplier or which customers have moved to a new supplier.