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 2019

This chart shows the domestic electricity 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:

  • Electricity - retail markets

Data Table

Electricity supply market shares by company: Domestic (GB)

British GasEDFE.ONnpowerScottish PowerSSECo-operative EnergyFirst UtilityOVO EnergyUtilitaUtility WarehouseGreen Star EnergyBulbOctopus EnergySmall Suppliers
Q1 200424%14%21%15%11%14%0%
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%0%
Q3 200522%13%20%15%13%16%0%
Q4 200522%13%20%15%13%16%0%
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%0%3%
Q4 201523%12%15%10%11%16%1%3%2%1%2%0%0%0%3%
Q1 201623%12%15%10%11%15%1%3%2%1%2%0%0%0%4%
Q2 201623%12%15%10%11%15%1%3%2%1%2%0%0%0%4%
Q3 201623%12%14%10%11%15%1%3%2%1%2%0%0%0%5%
Q4 201623%12%14%10%11%15%1%3%2%2%2%0%0%0%5%
Q1 201722%12%14%9%11%15%2%3%2%2%2%1%0%0%6%
Q2 201722%12%13%10%11%14%1%3%2%2%2%1%0%0%7%
Q3 201721%12%13%10%10%14%1%3%3%2%2%1%0%0%8%
Q4 201720%11%13%10%10%14%1%3%3%2%2%1%1%0%9%
Q1 201820%11%13%9%10%14%1%3%3%2%2%1%1%1%8%
Q2 201820%11%13%9%10%14%1%3%3%2%2%1%2%1%8%
Q3 201819%11%13%9%10%13%1%3%4%2%2%1%3%1%8%

More information

At-a-glance summary

Between Q2 2011 and Q3 2018, the combined electricity market share of the large six suppliers dropped from nearly 100% to 75%. The market share held by medium and small suppliers was 25% in Q3 2018.

We started classifying Octopus Energy as a medium supplier in Q3 2018, after achieving a market share greater than 1%.

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.

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

Date correct
January 2019
Policy area