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

To ask the Secretary of State for Business, Energy and Industrial Strategy, what estimate his Department has made of the percentage change in the cost for the average domestic dual fuel bill for customers of (a) British Gas, (b) EDF, (c) Npower, (d) E.ON, (e) Scottish Power and (f) SSE since 2010.

The Department for Business, Energy and Industrial Strategy collect data from energy companies on the price of energy. This data is collected in confidence and therefore cannot be provided by individual supplier.

In real terms, the cost of an average annual UK domestic energy bill based on fixed consumption levels[1] for combined gas and standard electricity increased year on year from 2010 to 2014 but fell between 2014 and 2016. Overall from 2010 to 2016, bills increased by 8.4 per cent, assuming fixed consumption. However, over this time period average household consumption of gas and electricity also fell, in large part as a result of improved energy efficiency. Based on actual consumption, bills were slightly lower in 2016 than 2010, although this reflects colder than average temperatures in 2010.

Data based on fixed consumption can be found online at: https://www.gov.uk/government/statistical-data-sets/annual-domestic-energy-price-statistics. Information on the impact of variable consumption can be found here: https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/604317/Domestic_energy_bills_in_2016_-_the_impact_of_variable_consumption.pdf.

Additionally, individual companies have published their total revenue from sales of domestic gas and electricity through the consolidated segmental reports which can be found here:

https://www.ofgem.gov.uk/system/files/docs/2017/06/links_to_consolidated_segmental_statements_0.pdf

[1] Consumption levels: 3,800kWh for electricity and 15,000kWh for gas