We compare almost every supplier in the UK. Read on to discover more about the companies we work with and the particular pros and cons of each.
And remember, our comparison engine is continually updated to reflect the changing marketplace. Fill in our simple form to receive immediate, up-to-date information which should help you find the right green energy provider for you.
Who is the Greenest Energy Supplier?
There is no definitive winner when it comes to the greenest energy supplier in the UK, but there are certainly some worthy companies making a genuine attempt to deliver sustainable energy.
Your ideal supplier will have the right combination of green credentials, pricing, and customer service.
Here are three companies we feel deserve a particular mention:
Octopus Energy
Octopus Energy offers 100% renewable electricity to business customers and households by harnessing the power of wind, sun and water. While Octopus doesn’t offer renewable gas, like other green energy providers, it uses carbon offsetting to reduce the impact of the gas it supplies.
The company scores 4.8 out of 5 from almost 360,000 reviews on Trustpilot, with its customer service considered among the best in the business. In fact, Which? has recommended Octopus as one of its top green energy providers year after year.
Ecotricity
Ecotricity was a pioneer in bringing green power to the UK and calls itself a ‘founder of the global green energy movement’.
Ecotricity offers a 100% renewable electricity tariff (certified vegan because it doesn’t use animal waste) largely generated using wind power. Some of the gas it supplies is biomethane, created from grass cuttings, and the rest is carbon offset natural gas. It helps business customers generate their own green energy by adding windmills or solar panels to premises.
Ecotricity scored highly in a 2024 Which? review of energy providers’ green credentials, and was named a recommended eco provider by the consumer research organisation.
The company offers tailored packages for large business customers, including half-hour metering and a dedicated account manager. It boasts Ford, Lush, Sainsbury’s, and Glastonbury Festival among its business customers. It also serves SMEs and promises they will always get the lowest rates available.
Good Energy
Good Energy supplies renewable electricity and green biogas and offsets its emissions by supporting green projects worldwide. It claims to be the only B Corp-certified home energy supplier, meaning it has to meet very high standards of social and environmental performance, transparency and accountability. It can install solar panels, generators and heat pumps, and has analytics to show large business customers where their power comes from every hour of the day, helping add weight to your company’s green credentials.
Which Energy Suppliers Offer Renewable Energy?
Here is our current list of energy suppliers offering renewable energy tariffs:
- 100Green (Green Energy UK)
- Boost Power
- British Gas
- Bryt Energy
- Co-operative Energy
- E.ON Next
- Ecotricity
- EDF Energy
- Good Energy
- LECCY
- Octopus Energy
- OVO Energy
- Sainsbury’s Energy
- Scottish Power
- So Energy
- SSE
- Utilita
- Utility Warehouse
Which is the Cheapest Green Energy Supplier?
With constantly fluctuating prices, the cheapest green energy supplier changes constantly. Most energy suppliers don’t publish their rates on their websites; you’ll usually have to fill in an online form about your business to get a tailored quote. As such, it’s hard to name a single provider as the ‘cheapest’.
That said, we would highlight a couple of suppliers that generally perform well on price as well as on delivering renewable energy.
EDF Energy offers small business customers fixed-price contracts for up to three years to give them price security and peace of mind. There’s no energy price cap for businesses, so this could be a good way to manage your company’s future energy spend as prices climb.
EDF Energy’s cheapest tariff is its Fixed Online for Business tariff which comes in a one-, two- or three-year contract. Electricity costs 26.4p per kWh with a standing charge of 50p per day under the one-year contract. Gas costs 7.5p per kWh with a standing charge of 45p per day.
If you need more flexibility, EDF also has a Freedom for Business tariff which allows business customers to leave their contract at any time without paying an exit fee. From April 2024, it charged 30p per kWh on a standard meter day rate plus a 150p standing charge. Gas was charged at 7p per kWh and a 200p per day standing charge.
For business contracts ending up to and including 31 March 2025, Ecotricity charges 24.5p per kWh for electricity and 6p per kWh for gas.
Which is the Best Green Energy Supplier in the UK?
The best green energy supplier for your business will depend on your business’s needs, how and when you use energy, how much flexibility you need in the terms of your contract, and, of course, price.
As such, it’s hard to choose just one supplier, but we think Octopus Energy stands out as a great all-rounder with solid green credentials, a tech-first approach, and great customer service.
Octopus Energy
Octopus Energy has absorbed numerous smaller energy market players that have gone bust over the last few years in a challenging period for the sector. The company has seemingly been able to cope well with the influx of new customers and consistently ranks highly for its customer service.
Octopus Energy focuses on delivering simple and transparent green energy tariffs and has several innovative products designed to help small businesses become more energy efficient. For instance, its ‘Shape Shifter’ tariff helps firms reduce their energy costs by shifting some of their usage away from peak times.
We think Octopus Energy is a solid choice for businesses of any size that want a reliable, green provider that’s pleasant to deal with and helps them save money on energy.