About us. Tariffs with environmental benefits

Our fixed electricity tariffs are matched 100% with renewable electricity.

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Where your electricity comes from

The mix of fuels we use to generate the electricity supplied to customers - along with their environmental impact - is known as the Fuel Mix Disclosure and we publish it every year.

British Gas Fuel Mix Disclosure table for 1st April 2022 – 31st March 2023
Energy Source British Gas Average UK Average
Renewables 54% 41%
Nuclear 26% 14%
Coal 2% 3%
Natural gas 17% 39%
Other fuels 1% 3%
CO2 emissions 88 g/kWh 199 g/kWh
High-level radioactive waste 0.0018 g/kWh 0.001 g/kWh

Fuel Mix of our Electricity tariffs

The table below shows the fuel mix if you are on a tariff with matched renewable electricity (including our green tariffs and Green Future tariffs). If you did not choose a tariff with matched renewable electricity, the fuel mix for 'Our other tariffs' applies to you.

British Gas fuel mix table
Energy Source Green Tariffs Our other tariffs
Renewables 100% 36%
Nuclear 0% 35%
Coal 0% 2%
Natural gas 0% 25%
Other fuels 0% 2%
CO2 emissions 0 g/kWh 129 g/kWh
High-level radioactive waste 0 g/kWh 0.0025 g/kWh

The importance of renewables

The UK Government is committed to developing renewable technologies and growing renewable energy generation.

Suppliers already source 41% of their electricity from renewable sources. For the period between 1st April 2022 and 31st March 2023, that figure for British Gas was 54%.

We also report zero carbon emissions from the electricity we supply on any of our fixed tariffs. Take a look at our Fuel Mix table above to see how we measure up.

How the electricity gets to your door

Electricity is generated in a variety of ways such as burning coal or using gas and wind turbines. It’s fed directly into the National Grid, and then through the transmission and distribution network to your home.

It isn’t possible to trace the electricity generated from a particular renewable source right through to each individual customer - it all gets mixed up in the grid. However, for some tariffs, suppliers will own or purchase certificates, such as Renewable Energy Guarantees of Origin (REGO) to show that the amount electricity used by customers on their tariffs has been sourced from renewable sources and fed into the National Grid.

Tariffs with matched renewable electricity

Some of our electricity tariffs match 100% of the electricity you purchase on the tariff with renewable electricity. This means that for all the electricity you use, the same amount is fed into the National Grid from renewable sources. We provide evidence of this by buying Renewable Energy Guarantee of Origin (REGO) certificates.

These tariffs provide an 'additional' environmental benefit because the matched renewable electricity is on top of our existing environmental commitments.

Take a look at the terms and conditions for your particular tariff to discover how much we offset your carbon footprint by matching electricity from renewable sources.

Green Future tariffs

Our Green Future tariffs are the greenest home-energy tariffs we offer.

For 100% of the electricity you use, we'll buy the same amount of electricity from renewable generators in the UK through agreements called Power Purchase Agreements. We provide evidence of this by buying Renewable Guarantees of Origin (REGOs) certificates with the power we purchase from the renewable generators we have agreements with.

For 10% of the gas you use, the same amount from renewable sources is fed into the gas network. We provide evidence of this by buying Renewable Gas Guarantees of Origin (RGGO) certificates from the Green Gas Certification Scheme (GGCS).

We also offset the carbon footprint from 90% of the gas you use. This is achieved by supporting traceable carbon emission reduction projects in the developing world - including purchasing carbon credits, such as Verified Emissions Reduction certificates or VERs.

If you are on a Green Future tariff, we’ll also protect up to 5 trees in the UK per household for each tariff. This is in addition to offsetting the carbon footprint created by 90% of the gas you use on this tariff.

Take a look at the terms and conditions for your tariff to see what green benefits it provides.


Some tariffs offer additional benefits to the environment on top of any legal obligations the energy supplier may have, this is called 'Additionality'. It could be matched renewable electricity or donations to an environmental organisation.