Best Green Energy Suppliers in the UK (August 2026)
100Green leads this month's ranking for green tariff availability, scoring 91 out of 100 based on renewable tariff and service evidence.
Overview
Quick summary
This guide ranks UK energy suppliers based on their green tariff availability and overall service quality. While choosing a supplier with strong renewable energy options helps households support zero-carbon generation, finding the right fit often means looking beyond environmental credentials to consider customer service ratings and tariff costs.
For this reason, our ranking relies on a composite score rather than price alone. A green supplier might perfectly align with your household values, but it may not always offer the lowest annual costs. To help you weigh the financial impact against the environmental benefits, the table below provides representative prices.
Top suppliers this month
- ★ #1 TOP PICK100Green91score out of 100
- #2Octopus Energy88score out of 100
- #3Good Energy86score out of 100
100Green takes the top spot with a score of 91. Alongside its green tariff, it offers excellent flexibility with two exit-fee-free plans. Its representative qualifying plan costs £1,561 a year—just £59 more than the lowest price in this comparison.
Octopus Energy follows closely with a score of 88. It also provides a green tariff and includes one exit-fee-free option, with a representative annual cost of £1,598 (£96 more than the cheapest available deal).
Good Energy rounds out the top three, scoring 86. Like the others, it features a green tariff and one plan without an exit fee, sitting at £1,595 a year—£93 above the lowest price shown here.
Supplier highlights
100Green
TOP PICKWho they are: Founded in 2001, 100Green is an independent energy supplier based in Hertfordshire. It provides domestic customers with 100% green gas alongside 100% renewable electricity.
Why choose them: Achieving a top score of 91, it offers two tariffs with no exit fees, making it a strong choice for flexibility. Although it costs £59 a year more than the cheapest option, a Citizens Advice score of 4.33 suggests highly reliable customer support.
Octopus Energy
Who they are: Octopus Energy is the UK's largest domestic energy supplier, widely known for its focus on smart technology and customer service. It supplies a 100% zero-carbon electricity mix and manages its own renewable energy assets.
Why choose them: While it costs £96 more than the cheapest option, a Trustpilot rating of 4.8 indicates outstanding customer satisfaction. It is an ideal fit for households willing to pay slightly more for a green tariff backed by a strong service record.
Good Energy
Who they are: Good Energy is a Chippenham-based renewable electricity supplier owned by Esyasoft. It purchases electricity directly from a network of independent renewable generators across the UK.
Why choose them: Priced £93 above the cheapest option, it provides a green tariff and one plan without an exit fee. An impressive Trustpilot rating of 4.8 suggests it is well worth considering if you value excellent customer feedback alongside renewable power.
E.ON Next
Who they are: As the customer-facing brand of the E.ON group, E.ON Next is one of the UK's largest domestic energy suppliers. It offers a wide range of energy plans and installs home energy technology, such as solar panels and heat pumps.
Why choose them: Priced £44 a year above the lowest option, it includes a green tariff and may suit those seeking a large, established supplier. However, it receives 780 complaints per 100,000 customers, which is higher than some competitors here.
OVO Energy
Who they are: Established in 2009, OVO Energy is one of the UK's largest domestic energy suppliers. It features a rewards programme called OVO Beyond, offering customers perks like gig tickets and free electric vehicle charging miles.
Why choose them: At £1,611 a year, it costs £109 more than the cheapest option. Although it provides a green tariff and one exit-fee-free plan, a high rate of 1,725 complaints per 100,000 customers may make it less appealing if service reliability is your main priority.
Ecotricity
Who they are: Founded in 1995, Ecotricity is a Stroud-based green energy supplier operating on a not-for-dividend model. Notably, it is the only energy company to offer officially vegan-certified energy.
Why choose them: Because it matches the lowest price in this data, it perfectly suits households looking to keep costs down while still securing a green tariff. It also maintains a relatively low complaint rate, with just 291 complaints per 100,000 customers.
So Energy
Who they are: So Energy is a smaller domestic supplier that uniquely allows customers to vote on where it buys its renewable electricity. It guarantees 100% renewable electricity across all of its fixed-rate tariffs.
Why choose them: Costing just £6 more than the cheapest option, it offers a green tariff and one exit-fee-free plan. However, with a high rate of 1,573 complaints per 100,000 customers, you may be trading service stability for a lower price.
Methodology
This ranking includes suppliers with qualifying green-tariff evidence and differentiates them using a composite score weighted towards overall service quality, rather than tariff price alone. The data relies on evidence from August 2026, and only suppliers with qualifying evidence for this month are included. The tariff prices shown serve as representative context for a household in the East Midlands paying by Monthly Direct Debit; your actual costs will vary depending on your location and energy usage.
All ranked suppliers (7)
Suppliers ranked by the evidence criteria shown below.
| # | Supplier | Overall score | Ratings and green tariff | Estimated annual cost |
|---|---|---|---|---|
| 1 | 100Green | 91 | Trustpilot 4.6/5 · Citizens Advice 4.3/5 · Green tariff available | £1,561/yr |
| 2 | Octopus Energy | 88 | Trustpilot 4.8/5 · Citizens Advice 3.7/5 · Green tariff available | £1,598/yr |
| 3 | Good Energy | 86 | Trustpilot 4.8/5 · Citizens Advice 3.5/5 · Green tariff available | £1,595/yr |
| 4 | E.ON Next | 86 | Trustpilot 4.5/5 · Citizens Advice 3.7/5 · Green tariff available | £1,546/yr |
| 5 | OVO Energy | 84 | Trustpilot 4.7/5 · Citizens Advice 3.3/5 · Green tariff available | £1,611/yr |
| 6 | Ecotricity | 80 | Trustpilot 4.2/5 · Citizens Advice 3.4/5 · Green tariff available | £1,502/yr |
| 7 | So Energy | 79 | Trustpilot 4.5/5 · Citizens Advice 2.9/5 · Green tariff available | £1,508/yr |
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Our verdict
100Green leads this month's ranking with a score of 91, supported by its strong green tariff availability and two exit-fee-free options.
Octopus Energy and Good Energy also score highly, as both offer green tariffs and one exit-fee-free option. Octopus Energy costs £1,598 a year, while Good Energy sits at £1,595, making them £96 and £93 more than the cheapest option, respectively.
Ecotricity matches the lowest representative cost in this data at £1,502 a year, alongside its green tariff. So Energy is another lower-cost option at £1,508 a year, though it is worth weighing this saving against its higher rate of customer complaints.
Frequently asked questions
What makes an energy tariff green?
A green tariff usually means the supplier buys renewable energy or green certificates to match the amount of electricity you use. Some suppliers go further by generating their own renewable power or buying directly from independent UK wind and solar farms.
Will a fixed tariff keep my energy bills the same every month?
No. A fixed tariff locks in your unit rates (pence per kWh) and your daily standing charge for the length of the contract. It does not fix your total bill, which will still rise or fall depending on how much gas and electricity you use.
Do green energy tariffs cost more?
Not always. While fully renewable energy can sometimes cost more to source, many suppliers offer green tariffs that are priced closely to standard deals. It is worth checking representative annual costs to see how different options fit your budget.
Can I switch to a green supplier if I rent my home?
Yes, if you pay the energy bills directly to the supplier, you have the right to switch. If your landlord pays the bills and charges you later, you will need to ask them to change the supplier for you.
Are there exit fees if I leave a green tariff early?
It depends on the specific tariff. Many fixed-term green tariffs have an exit fee if you leave before the contract ends. However, some suppliers offer variable or tracker tariffs with no exit fees, giving you the flexibility to switch without a penalty.
Written by
Rob Gibbs
Hi, I'm Rob, and I run Energy-Review.co.uk. I initially started this project in 2018 when I was looking to switch energy suppliers and found there wasn't a website that provided simple, data-backed reviews on all the suppliers available. Since then, I have spent a lot of time (too much, some may say!) looking at all publicly available data about each supplier and writing reviews using this information. These reviews are updated as regularly as possible, and any data is backed up by a source where necessary. I have also started writing guides on various energy-related topics, which hopefully you will find useful. If you find any issues, please use our contact form to let us know.
What changed this month
No significant changes this month.
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