Gas supply market shares by company: Domestic (GB)


Javascript is required to render chart Gas supply market shares by company: Domestic (GB) .

Source: Ofgem analysis of Xoserve reports.

Information correct as of: October 2018

This chart shows the domestic gas market shares for each of the six large suppliers, medium and small suppliers.

Chart tip: To look at a specific data series or to switch a series view on and off, click on a title in the chart legend (e.g. British Gas).

Policy Areas:

  • Gas - retail markets

Data Table

Gas supply market shares by company: Domestic (GB)

British GasEDFEONnpowerScottish PowerSSEUtility Warehouse OVO EnergyFirst UtilityUtilitaCo-operative EnergyGreen Star EnergyBulbSmall Suppliers
2005 Q255%5%12%10%9%9%
2005 Q355%5%12%10%9%10%
2005 Q454%5%12%10%9%10%
2006 Q154%5%12%10%9%10%
2006 Q252%6%12%11%9%11%
2006 Q351%6%12%11%8%11%
2006 Q450%6%12%12%8%12%
2007 Q148%7%12%12%9%13%
2007 Q248%7%12%12%8%13%
2007 Q348%7%12%12%8%14%
2007 Q447%7%11%12%8%14%
2008 Q147%7%12%12%8%14%
2008 Q246%7%12%12%8%15%
2008 Q345%7%12%12%9%15%
2008 Q445%7%12%12%9%16%
2009 Q144%7%12%12%9%16%
2009 Q244%7%12%12%9%16%
2009 Q344%7%12%12%8%16%
2009 Q444%7%12%12%8%16%
2010 Q144%7%12%12%8%16%
2010 Q244%7%12%12%8%16%
2010 Q344%7%12%11%8%16%
2010 Q443%7%12%11%9%16%
2011 Q143%8%13%11%9%16%
2011 Q243%7%13%11%9%16%
2011 Q343%8%13%12%8%16%
2011 Q442%8%13%12%8%16%
2012 Q142%8%13%12%8%16%0%0%0%0%0%0%
2012 Q242%8%13%12%8%16%0%0%0%0%0%0%
2012 Q341%9%13%12%9%15%0%0%0%0%0%0%
2012 Q441%9%13%12%9%15%0%0%1%0%0%0%
2013 Q141%8%13%12%9%15%0%0%1%0%0%0%0%
2013 Q241%9%13%11%9%15%0%0%1%0%0%0%0%
2013 Q340%9%13%11%9%15%0%0%1%0%1%0%1%
2013 Q439%9%13%10%9%15%2%0%1%0%1%0%1%
2014 Q139%9%12%10%9%14%2%1%2%0%1%0%1%
2014 Q238%9%12%10%9%14%2%1%2%0%1%0%1%
2014 Q338%9%12%10%9%14%2%1%2%1%1%0%1%
2014 Q438%9%12%9%9%14%2%1%3%1%1%0%2%
2015 Q138%9%12%9%9%13%2%2%3%1%1%0%2%
2015 Q237%9%12%9%9%13%2%2%3%1%1%0%2%
2015 Q337%8%12%9%9%13%2%2%3%1%1%0%0%3%
2015 Q437%8%12%9%9%13%2%2%4%1%1%0%0%3%
2016 Q136%8%11%9%9%13%2%2%4%1%1%0%0%4%
2016 Q236%8%11%9%9%12%2%3%4%2%1%1%0%5%
2016 Q335%8%11%9%9%12%2%3%4%2%1%1%0%5%
2016 Q435%8%10%9%9%12%2%3%4%2%1%1%0%5%
2017 Q134%8%10%8%9%12%2%3%3%2%2%1%0%6%
2017 Q233%8%11%8%9%11%2%2%3%2%1%1%0%7%
2017 Q332%9%11%8%9%11%2%3%3%2%1%1%1%8%
2017 Q431%9%11%8%9%11%2%3%3%2%1%1%1%9%
2018 Q130%8%11%8%9%11%2%3%3%2%1%1%1%9%
2018 Q230%8%11%8%8%11%2%3%3%2%1%1%2%10%

More information

At-a-glance summary

Between Q2 2011 and Q2 2018, the gas market share of the six large suppliers dropped from nearly 100% to 75%. The market share for the largest gas supplier in the GB domestic market, British Gas, fell from 43% to 30%. The market share held by medium and small suppliers was 25% in Q2 2018.

Between Q2 2017 and Q2 2018, the market share for small suppliers (defined as those who have individual market shares below 1% in either gas or electricity) rose to 10%, up by three percentage points.

Among medium suppliers (defined as those outside the group of six large suppliers but with market shares of 1% or more) growth in market share remains slow, with the exception of Bulb, which has almost doubled its market share in Q2 2018.

Relevance and further information

The evolution of market shares is a useful measure of trends in market concentration. They help us understand the impact between market shares and competitive dynamics, both for the six large suppliers and other suppliers, and which companies are winning or losing customers.


We calculate market shares from the number of meter points on the gas distribution networks, as provided to us by Xoserve. As of July 2017, supply points connected to independent gas transporters are included in the gas data provided by Xoserve.

We periodically review, typically with a lag of one quarter, the group of suppliers that we define as medium and small.

Date correct
October 2018
Policy area