Top 5 green energy providers for 2021

Written by Good Money Girl on 14th Jan 2021

Warning (September 21, 2021): A number of smaller energy providers have collapsed in recent days, and many are struggling, because of an energy crisis that has sent wholesale gas prices soaring. A government cap on energy prices means they have been unable to pass the additional costs on to the customer. If you are considering switching to a green energy supplier, make sure you feel confident that it is likely to remain operational given the current situation. 

The number of providers supplying renewable energy in the UK has exploded in recent years, from a grand total of zero just over ten years ago, there are now more than thirty companies pumping renewable energy into UK homes and businesses – including some of the big six.

Traditionally, energy providers have supplied mainly renewable electricity with gas still coming from traditional sources. However, a growing number of providers are now going 100 per cent renewable using biomass gas, or innovative offsetting techniques to go carbon neutral.

Those who want to green their energy supply can choose between these smaller ‘eco-only’ suppliers, or larger suppliers who offer a renewable tariff that tend to be cheaper, but may also have fossil fuel energy on their books. Other things to consider include whether the providers are also building or investing in new supply, or simply using what is already there.

In the wake of a number of energy company collapses in recent days, you will also want to feel confident that the supplier is solid enough to stand the test of time. While we can’t predict the future, we do think the below are a good crop taking from a service, solidity, price and renewable commitment point of view.

Here are five options to consider:

100Green (formerly GEUK)

100Green (formerly Green Energy UK/GEUK) is the only UK provider supplying both 100 per cent renewable electricity and 100 per cent green biomethane gas. The former is generated from solar, wind and hydro while its gas is generated through anaerobic digestion using pig waste at the company’s Gask Farm site.

It is certified by the Green Gas Certification Scheme (GGCS), which tracks biomethane through the supply chain. The firm has 4.5 out of five stars based on 950 reviews on Trust Pilot. However, while 100Green’s sustainable credentials do stand-out from its peers, you can expect to pay more for your tariff than you would with other providers.


One of the original green energy pioneers, Ecotricity guarantees 100 per cent green electricity and carbon neutral green gas. It continues to push the clean energy envelope by investing its profits into buying its own wind and solar farms, as well as an innovative grass-fed green gasmill.

Ecotricity is also the only energy provider to calculate its entire footprint – per customer – and the only provider to be registered with the Vegan Society, promising that none of its biomass contains animal products.

Good Energy 

Another old favourite, Good Energy also both generates and supplies renewable energy, with 100 per cent of its electricity generated by its wind and solar farms, as well as through hydroelectricty and biofuels. Around 10 per cent of its gas is renewable, with the remainder of its carbon footprint offset through schemes including installing biogas digesters in India and China that enable farmers to use animal waste to generate clean fuel.

Octopus Energy

The largest investor in solar generation in Europe, Octopus has built over 150 solar farms in the UK, generating 40 per cent of our large-scale solar. It says its Super Green tariff is fully carbon neutral, offering 100 per cent renewable electricity and full carbon offsets for gas. Octopus was also the Which? top recommended supplier for 2020.

However, it’s worth noting that in April 2020, Friends of the Earth decided to stop its endorsement of Octopus after the energy firm accepted investment from an Australian energy company involved in coal power generation and fracking.

SO Energy

Founded in 2015, So Energy is a small green electricity-only supplier with the ethos ‘simplicity, honesty and great value’. It has pledged that its fixed rate tariffs will always be among the best value offered by any supplier. It is the only supplier of renewable electricity that gives customers the chance to vote on how it is sourced. You can vote on hydro, solar, wind or biomass, and SO Energy will base the percentage it buys from each source for the following year on the results. SO Energy was one of the Which? top 3 recommended energy suppliers for 2020.

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