Is Octopus Energy renewable?
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Octopus Energy's published fuel mix for 1 April 2024 to 31 March 2025 shows 100% zero-carbon electricity: 86.4% renewables and 13.6% nuclear, with no gas or coal. So it is mostly renewable rather than 100% renewable. Octopus says it buys renewable power to match some of its customers' usage and sources the rest through long-term deals with renewable generators. Figures are as published by Octopus and can change.
Octopus Energy's electricity mix
| Source | Share of Octopus's electricity |
|---|---|
| Renewables (wind, solar, hydro and others) | 86.4% |
| Nuclear | 13.6% |
| Gas | 0% |
| Coal | 0% |
| Total zero carbon | 100% |
This is Octopus's own disclosure for 1 April 2024 to 31 March 2025. Octopus reports carbon emissions of 0 g/kWh for its electricity, compared with 154 g/kWh for the UK overall.
Zero carbon is not the same as 100% renewable
Octopus's headline figure is "100% zero carbon", and that includes nuclear. Nuclear generation has no operating carbon emissions but is not classed as renewable, and Octopus notes it produces radioactive waste. If you specifically want a supplier whose electricity is entirely renewable, the 86.4% renewable share is the number to look at.
How can a supplier be "green" if the grid is mixed?
Electricity from every generator goes into the same national grid, so a supplier can't send "green electrons" to one home. Octopus says it instead buys renewable electricity to match some of the energy its customers use, and buys the rest through long-term power purchase agreements with around 700 renewable generators.
The way suppliers evidence this is the fuel mix disclosure. Under that system, suppliers must tell customers what fuels sit behind the electricity they supply. According to Ofgem, which runs the system for Great Britain, a Renewable Energy Guarantee of Origin (REGO) is issued for every megawatt hour of eligible renewable output, and REGOs are mainly used for fuel mix disclosure.
What about gas?
The mix above is for electricity only. Octopus's own page describes its gas offering separately: customers on its Super Green tariff have their gas carbon-offset, and Octopus says this offset around 1 million tonnes of CO2 between 2018 and 2023 with its partner Renewable World. That is an offsetting claim, not a statement that the gas itself is renewable.
Does this change which tariff to pick?
The mix figure applies to Octopus's electricity as a whole, and Octopus's page doesn't break it down by tariff. If cost is your priority, our Agile vs Go comparison covers the smart tariffs, and our switching guide covers the process.
Octopus updates its fuel mix each year. Check Octopus's own page for the latest figures before you rely on them.
Frequently asked questions
Is Octopus Energy 100% renewable?
Does Octopus Energy use nuclear power?
What is a REGO certificate?
Is Octopus Energy's gas green?
Where can I check Octopus's latest fuel mix?
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