Fuel Mix Data for Electricity Suppliers in the UK
Want to know where your energy comes from? Each supplier has a different fuel mix.
Gas is usually extracted or imported, so this article concentrates on what powers the electricity for the energy suppliers in the UK.
All companies must publish this data as required by the Electricity (Fuel Mix Disclosure) Regulations 2005 and monitored by Ofgem, the industry regulator.
As investment continues into alternative energy sources, you will see the data change around a lot in the coming years.
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| Company | Coal | Gas | Nuclear | Renewables | other | CO2 emissions |
| British Gas | 4.0% | 17.0% | 57.0% | 20.0% | 2.0% | 117g/kWh |
| EDF | 4.3% | 19.7% | 54.0% | 20.1% | 1.9% | 136g/kWh |
| E.ON | 0.0% | 0.0% | 0.0% | 100.0% | 0.0% | 0g/kWh |
| Octopus | 0.0% | 0.0% | 15.2% | 84.8% | 3.0% | 0g/kWh |
| ScottishPower | 13.0% | 60.0% | 9.0% | 11.0% | 7.0% | 415g/kWh |
| SSE | 0.0% | 36.0% | 0.0% | 64.0% | 0.0% | 135g/kWh |
| UK Average | 6.3% | 35.0% | 12.7% | 43.2% | 2.8% | 222g/kWh |
Figures are for domestic customers where appropriate for the period 1st April 2023 to 31st March 2024. Renewable sources include offshore wind, onshore wind, solar, hydro and biomass.
All suppliers provide their fuel mix disclosure data in October each year. The UK averages are provided by the Department for Energy Security & Net Zero (DESNZ).
So there you have it – there’s a vast difference between the various UK energy companies on what fuel they use to generate the electricity you use in your home or business. Whether you think nuclear is best, coal or gas could be a factor in what company you use, apart from finding the cheapest fuel prices.
This transparency allows you to make an informed choice when deciding to switch electricity companies for lower prices.