Green Energy Company Profiles

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Bulb Energy

Bulb Energy is one of the fastest growing independent energy firms with over 1.5 million customers. Their plain talking, no nonsense approach to green business energy and their track record for good customer service has earned them the title of the ‘UK’s biggest green energy supplier’ ahead of all others.

Their fuel mix is 100% green. Their electricity is 100% renewable and for every unit a customer uses, they put another unit back on the grid through a renewable source such as solar or wind. Their electricity fuel mix is 73% wind, 24% solar and 3% hydro. Their gas is also 100% carbon neutral, with 10% made from renewable sources and the other 90% offset against global carbon reduction projects.

This mix means Bulb customers emit 0.00 kg of CO2 per kWh of electricity and 0.00 kg of CO2 per kWh of gas. You can use Bulb’s Carbon Tracker to find out how much CO2 has been saved this year to date (5.3 million tonnes as of 04/12/19).

Bristol Energy

Bristol Energy didn’t start life out as a 100% green energy firm and to date they still aren’t, but they are making tracks to become one. 79% of their fuel mix was green from April 2018 to April 2019, and they are planning to invest more in local energy generators around Bristol to increase this percentage further.

The CO2 emissions per Bristol Energy customer are far lower than the national average, sitting at 76 g/kWh versus 208 g/kWh. These emissions will reduce as Bristol Energy become more dependant on renewable sources.

As a council-owned energy firm Bristol Energy are unique, and they’ve humanised the switching process to make them a more approachable energy supplier. This has helped them grow their customer base to over 65,000 households and businesses, and they want to grow this number considerably in 2020.


Ecotricity is a 100% green energy firm with no electricity or gas generated by coal, nuclear or other brown energy sources. They are also vegan and were the first energy supplier to be recognised by The Vegan Society.

Their electricity fuel mix is made up of 85.90% offshore wind, 14.94% onshore wind, 0.12% solar and 0.03% hydro (2018/19). This fuel mix means customers emit 0.00 kg of CO2 per kWh of electricity and 0.00 kg of CO2 per kWh of gas, as well as 0.00 kg of radioactive waste per kWh. Their gas is also carbon neutral.

Ecotricity’s use of onshore wind is funded wholly by themselves with their own green energy parks. Like most other suppliers, they purchase their offshore energy from other green generators. In the future, Ecotricity aim to generate all their own green electricity in the UK using onshore wind and solar.

Good Energy

Good Energy has a long history of investing in renewable energy. In fact, they were the first dedicated 100% renewable electricity supplier, so you could say they started the movement which all other green firms have joined.

Their electricity fuel mix is impressive and quite different to Ecotricity’s, with 57% of electricity generated by wind, 20% by bio generation, 18% by solar and 5% by hydro. The 20% bio generation stat is the highest in the industry.

In addition to 100% green electricity, they also offer carbon neutral gas. 6% of the gas they source is biogas and for the rest which comes from non-renewable sources, they neutralise the emissions by investing in verified carbon neutral schemes.

Good Energy customers (of which there are over 200,000) emit 0.00 kg of CO2 per kWh of electricity and 0.00 kg CO2 per kWh of gas, making the energy carbon neutral.

Green Energy UK

Unlike most green energy firms who source some of their renewable energy from abroad, Green Energy UK sources all its energy from UK green generators. This keeps investment in the UK, helping reduce the country’s carbon footprint.

They provide 100% green electricity and 100% green gas with the electricity generated through wind, solar, hydro, biomass and anaerobic digestion. Although they haven’t published these as percentages, it is reasonable to assume they generate most electricity from wind followed by solar or biomass.

The gas Green Energy UK supplies is biomethane authorised by the Green Gas Certification Scheme. It’s produced mainly through biomass and anaerobic digestion. Its creation does produce CO2, but this is offset by the amount of carbon the biomass absorbs while it grows, making it carbon neutral.

Octopus Energy

Thanks to their recent acquisition of Co-Operative Energy, Octopus Energy has over a million domestic and business customers and counting.

100% of their energy is sourced via renewable sources, and for every unit of electricity their customers use, they buy the same amount back alongside renewable energy ‘REGO’ certificates. This offsets any emissions to achieve true carbon neutrality.

Octopus’s electricity fuel mix as of 2018 was 59% wind, 40% solar and 1% hydro. Unlike some suppliers, they do not rely on biomass for their electricity, preferring instead to source from wind. The gas they provide is biomethane which is generated through anaerobic digestion with emissions offset by investment in energy projects.

Thanks to their carbon neutrality, Octopus are one of the fastest growing independent energy suppliers in the UK. They also have a solid customer service record and are known for making the switching process hassle-free.

People’s Energy

People’s Energy has a unique and interesting proposition for potential customers – they will return 75% of company profits back to their members. This comes in the form of an account credit which is put towards their energy bills, so the price of their gas and electricity tells only half the story when it comes to value for money.

In terms of their green credentials, People’s Energy offer 100% renewable electricity, with customers emitting 0.00 kg of CO2 per kWh of electricity. They do not offer 100% green gas yet, but they plan to improve that in the next couple of years. For now, they supply natural gas only with no green mix as of 2019.

The company didn’t turn a profit in 2018 so the 75% profit share with shareholders (customers) didn’t go ahead then, but they expect to turn a profit in 2019, putting them on track to return some profits in 2020.

Yorkshire Energy

100% of the electricity Yorkshire Energy sources comes from wind turbines, making them the only 100% wind-powered renewable electricity supplier. They also buy back the same amount of electricity their customers consume from 100% renewable sources, making their electricity 100% green and carbon neutral.

Currently, Yorkshire Energy do not supply green gas in any form. 100% of their gas is natural gas, although they have committed to implementing green gas in the future (this is a commonality shared with most energy suppliers – green gas is not always available, and so it cannot always be guaranteed by a supplier).

Despite their name, Yorkshire Energy are a national energy supplier to England, Wales and Scotland. The company was founded in 2018 and has less than 250,000 customers, making them one of the smallest energy firms but a fast growing one. They believe in good value, easy to understand tariffs and excellent service.

To learn more about fuel mix disclose, click here.

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