Electricity supply market shares by company: Domestic (GB)


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

Source: Ofgem analysis of electricity distribution network operator reports.

Information correct as of: January 2018

This chart shows the domestic electricity market shares for each of the six large suppliers, five medium sized suppliers and other suppliers (presented in aggregate as ‘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:

  • Electricity - retail markets

Data Table

Electricity supply market shares by company: Domestic (GB)

British GasEDFE.ONRWE npowerScottish PowerSSECo-operative EnergyFirst UtilityOVOUtilitaUtility WarehouseGreen Star EnergySmall Suppliers
Q1 200424%14%21%15%11%14%1%
Q2 200424%14%21%15%12%15%0%
Q3 200424%14%21%15%12%15%0%
Q4 200423%13%21%15%13%15%0%
Q1 200522%13%21%15%13%15%0%
Q2 200522%13%21%15%13%16%1%
Q3 200522%13%20%15%13%16%1%
Q4 200522%13%20%15%13%16%1%
Q1 200622%13%20%15%13%16%0%
Q2 200622%14%20%15%13%16%0%
Q3 200622%14%20%15%12%17%0%
Q4 200622%14%19%16%12%17%0%
Q1 200722%14%19%16%12%18%0%
Q2 200722%14%19%16%12%18%0%
Q3 200722%13%18%16%12%18%0%
Q4 200722%13%18%15%12%18%0%
Q1 200822%13%18%15%12%19%0%
Q2 200822%13%18%15%12%19%0%
Q3 200822%13%18%15%12%19%0%
Q4 200822%13%18%15%12%19%0%
Q1 200922%13%18%15%12%20%0%
Q2 200923%13%18%15%12%20%0%
Q3 200923%13%18%15%12%20%0%
Q4 200923%13%18%14%12%20%0%
Q1 201024%13%17%14%12%20%1%
Q2 201024%13%17%14%12%20%1%
Q3 201024%13%17%14%12%20%1%
Q4 201025%13%17%14%11%20%1%
Q1 201125%13%17%14%11%20%1%
Q2 201125%13%17%14%11%20%1%
Q3 201125%13%17%14%11%19%1%
Q4 201125%13%17%14%11%19%1%
Q1 201225%13%17%14%11%19%1%
Q2 201225%13%17%14%11%19%1%
Q3 201225%13%17%14%11%19%1%
Q4 201225%13%17%14%12%18%0%1%0%0%0%0%
Q1 201325%13%17%13%12%18%0%1%1%0%0%0%1%
Q2 201325%13%17%13%12%18%0%1%1%0%0%0%1%
Q3 201325%13%16%13%12%18%0%1%0%0%0%0%1%
Q4 201324%13%16%12%12%18%1%1%0%0%1%0%1%
Q1 201424%13%16%12%12%17%1%1%1%0%2%0%1%
Q2 201424%13%16%12%11%17%1%2%1%0%2%0%1%
Q3 201424%13%16%11%11%17%1%2%1%0%2%0%2%
Q4 201424%13%16%11%11%17%1%3%1%1%2%0%2%
Q1 201524%13%16%11%11%16%1%3%2%1%2%0%2%
Q2 201524%12%16%11%11%16%1%3%2%1%2%0%2%
Q3 201524%12%16%11%11%16%1%3%2%1%2%0%3%
Q4 201523%12%15%10%11%16%1%3%2%1%2%0%3%
Q1 201623%12%15%10%11%15%1%3%2%1%2%0%4%
Q2 201623%12%15%10%11%15%1%3%2%1%2%0%5%
Q3 201623%12%14%10%11%15%1%3%2%1%2%0%5%
Q4 201623%12%14%10%11%15%1%3%2%2%2%0%5%
Q1 201722%12%14%9%11%15%2%3%2%2%2%1%6%
Q2 201722%12%13%10%11%14%1%3%2%2%2%1%7%
Q3 201721%12%13%10%10%14%1%3%3%2%2%1%8%

More information

At-a-glance summary

Between 2004 and Q3 2017, the combined electricity market share of the large six suppliers dropped from nearly 100% to 81%.

The combined market share for five of the large electricity suppliers (excluding British Gas) in the GB domestic market declined by 16 percentage points, from 75% to 59%. Individual market shares fluctuated between 10% and 21%. 

In the same period, British Gas was the leading domestic electricity supplier in GB, with a market share ranging between 21% and 25%. 

Until 2012, other suppliers held a market share of below 2%. Since then, their share has grown significantly. They reached a market share of 19% in Q3 2017, four percentage points up on Q3 2016.

After continued growth since its entry in 2013, Green Star Energy reached a market share above 1% in Q3 2017. It has joined the medium sized supplier group, together with Utility Warehouse, OVO, First Utility, Utilita and Cooperative Energy. These five suppliers had slower growth in the year up to Q3 2017 compared to previous years in the 2012-2015 period.

Small suppliers, who have individual market shares below 1%, have reached a combined market share of 8% in Q3 2017, 3 percentage points up compared to Q3 2016. 

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 electricity distribution networks, as provided to us by electricity distribution network operators.

Date correct
January 2018
Policy area