Average tariff prices by supplier: Standard variable vs cheapest available tariffs (GB)


Source: Energylinx.

Information correct as of: June 2017

This chart shows average prices in the last quarter for each of the 10 larger suppliers in the non-prepayment segment. These include suppliers’ standard variable and cheapest tariffs, which are compared with the average price of the market cheapest tariff in the 3 month period.

We base the figures on a typical domestic dual fuel customer paying by direct debit.

This information should not be used as a price comparison tool. To access accredited price comparison sites, see Compare gas and electricity tariffs.

We update this chart on a quarterly basis. Click the ‘more information’ tab above for a summary of the latest trends, details of how to interpret the figures and for information on our methodology.

Policy Areas:

  • Electricity - retail markets
  • Gas - retail markets

Data Table

Average tariff prices by supplier: Standard variable vs cheapest available tariffs (GB)

SupplierAverage annual bill on standard variable tariffSupplier's cheapest annual average tariffMarket cheapest annual average tariff
British Gas1044989852
Scottish Power11671025852
RWE npower1187938852
First Utility1149927852
Utility Warehouse1102976852

More information

At-a-glance summary

Between April and June 2017, the average standard variable tariff (‘SVT’) price for a domestic customer with one of the 10 larger suppliers in the non-prepayment segment ranged between £1,044 and £1,187.

The cheapest deals were all above the average market cheapest tariff of £852, ranging between £919 and £1,029. As a result, the average SVT price differentials in the period were between £55 and £260 relative to suppliers’ cheapest tariffs and between £192 and £335 relative to the market cheapest tariff.

Relevance and further information

This chart measures the savings available to SVT customers if they change tariff or switch supplier.

It should be considered jointly with our chart on the Number of non-prepayment domestic customer accounts by supplier: Standard variable, fixed and other tariffs (GB)

Our data shows SVTs are usually more expensive than other deals available in the market. As of October 2016 around 19 million domestic energy accounts (15 million paying by non-prepayment methods) are on SVTs. These customers are potentially missing out on significant savings on their bills compared to cheaper tariffs from their existing or another supplier. 

To view our previously published snapshot of SVT customers by supplier and the potential savings available to them, see Standard variable tariff comparison: 28 November 2016. Due to different calculation methods, the 28 November snapshot should not be used as a like-for-like comparison with the data in this chart. In particular, this is because the prices here reflect average prices over the previous quarter whereas our previous information presents a snapshot in time. See our methodology below for further detail.


  • All tariffs shown are for a dual fuel direct debit domestic customer with typical ‘medium’ consumption (3,100 kWh/year for electricity and 12,500 kWh/year for gas). 
  • We do not show prices from suppliers with fewer than 250,000 non-prepayment customer accounts, for either gas or electricity.
  • We use weekly prices across the quarter prior to publication to calculate the average SVT price. We take the data from Energylinx for each Monday of every week in the analysed period. SVT prices in this chart always refer to paper billing prices.
  • We use the same calculations to produce the average cheapest tariff price for each supplier and for the average market cheapest tariff price.
  • When calculating the cheapest tariff at both individual supplier and market level, we exclude tariffs restricted to certain regions. This is so we give a representative picture of tariffs generally available to all customers across GB.
  • When calculating the cheapest tariff at individual supplier level, we:
    • include tariffs only available to existing customers (also known as ‘retention' tariffs).
    • exclude tariffs only available to new customers (also known as ‘acquisition’ tariffs).
  • When calculating the cheapest tariff at market level, we:
    • include tariffs only available to new customers (also known as ‘acquisition’ tariffs).
    • exclude tariffs only available to existing customers (also known as ‘retention' tariffs).
  • Collective tariffs or exclusive deals only available through a supplier’s website or through a specific price comparison website are included to the extent they are ‘open collective switches’ available to all customers. We also include tariffs restricted to a particular payment method, except for prepayment.
  • The cheapest tariffs can include fixed and variable tariffs, may or may not involve exit fees, rewards or discounts, may only be available online and may be offered by any suppliers active in the market. Some suppliers included in the average market cheapest tariffs may not offer the Warm Home Discount.
  • We include tariffs available with ‘white label’ providers in the calculation of the market cheapest tariff. Where relevant, we have also included them in the cheapest tariff offered by the parent supplier of the ‘white label’. ‘White label’ providers are organisations without supply licences that partner with an active licensed supplier to offer gas and electricity tariffs using their own brand.
Date correct
June 2017
Policy areas