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Bulb is the biggest green energy company

This claim is supported by data shared by Ofgem, the energy regulator, in their quarterly report 'Electricity supply market shares by company: Domestic(GB)' (as of May 2020). This report shows the market share of energy companies over time. All suppliers with a market share of 1% or above are shown individually. Suppliers with less than 1% market share are grouped together and listed under 'Small Suppliers'.

There are only three green energy suppliers listed as having a domestic market share of 1% or above: Shell Energy, Bulb and Octopus. These suppliers are understood to be 'green energy companies' as they supply 100% renewable electricity to both their domestic and business customers. Ofgem defines a 'green tariff' as 'those tariffs for which suppliers declare acquiring at least 100% renewable electricity'. Find a full list of 100% Renewable Electricity suppliers at Electricity info, an independent information site.

Of the three green energy companies in the report, Bulb holds the biggest market share (5%).

This chart shows the domestic electricity market share for all suppliers with >1% market share. ‘Small’ suppliers (with <1% market share each) are grouped together.

The full report is published on the Ofgem website.

Q1 2019Q2 2019Q3 2019Q4 2019
British Gas19%19%19%19%
EDF11%11%11%11%
E.ON12%12%12%12%
npower8%8%7%7%
Scottish Power10%9%9%9%
SSE13%13%12%12%
Shell3%3%3%3%
OVO5%4%4%4%
Utilita2%2%3%3%
Utility Warehouse2%2%2%2%
Avro1%1%1%1%
Bulb4%5%5%5%
Octopus2%4%4%4%
Green Network Energy1%1%1%1%
Small suppliers8%7%7%7%