Best Energy Suppliers for Customer Service in the UK (August 2026)
100Green leads this month's ranking for customer service, earning a composite score of 90 based on independent ratings and official complaint data.
Overview
Quick summary
This guide ranks UK energy suppliers using a composite customer service score. By combining Citizens Advice scores with call-wait and email-response measures, this score provides a consistent view of supplier service performance. Reliable service is essential when resolving billing issues, booking smart meter installations, or managing your account.
Service scores and representative annual costs do not always move together, so compare both before deciding whether a supplier is right for you. To help you compare costs, the prices displayed are representative examples based on the East Midlands region.
Top suppliers this month
- ★ #1 TOP PICK100Green90score out of 100
- #2Outfox Energy90score out of 100
- #3Ecotricity81score out of 100
100Green takes first place in this comparison with an impressive customer service score of 90. It provides green tariff options and offers two tariffs with no exit fees. At £1,561, its representative annual cost is £80 more than the cheapest option in our dataset.
Outfox Energy follows closely with a score of 90. At £1,481, it offers the cheapest representative annual cost in this comparison. While it features one tariff with no exit fee, it does not currently list a green energy option in this dataset.
Supplier highlights
100Green
TOP PICKWho they are: Founded in 2001, 100Green is an independent, Hertfordshire-based energy supplier. It holds a special exemption from the Ofgem price cap, allowing it to offer fully renewable electricity and green gas.
Why choose them: Achieving the highest composite score of 90 and a Citizens Advice score of 4.33, 100Green is a strong option if exceptional service and green energy outweigh the £80 premium over the cheapest supplier.
Outfox Energy
Who they are: Based in Leicester, Outfox Energy is an independent, family-run UK energy supplier dedicated to keeping costs low for its customers.
Why choose them: At £1,481 a year, it is the cheapest option in this comparison. Combined with a high Trustpilot rating of 4.8, it is a strong option for households looking to save money while retaining a high service score.
Ecotricity
Who they are: Founded in 1995, Ecotricity is an independent, Gloucestershire-based supplier operating on a not-for-dividend model to fund new renewable energy generation.
Why choose them: Priced just £21 a year above the cheapest option, Ecotricity includes green tariffs and maintains a solid service score of 81. This appeals to households looking to support renewable generation without sacrificing service.
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.
Why choose them: Although it costs £65 more a year than the cheapest option, it holds a 4.5 Trustpilot rating. This provides a great middle ground for households seeking a large supplier with green tariff options.
E Energy
Who they are: Established in 2014, E Energy is a privately owned, Birmingham-based domestic supplier focused primarily on the pay-as-you-go and smart meter markets.
Why choose them: With a solid service score of 80 and 174 complaints per 100,000 customers, E Energy is a reasonable choice for prepayment meter users. However, it does not offer any tariffs without exit fees in this comparison.
Octopus Energy
Who they are: Backed by the Octopus Group, Octopus Energy is the UK's largest domestic energy supplier, utilising its own proprietary software platform to manage customer accounts.
Why choose them: It costs £117 more a year than the cheapest option but maintains a stellar 4.8 Trustpilot rating. This supplier is ideal for customers who prefer managing their energy through a highly rated app.
OVO Energy
Who they are: Established in 2009, OVO Energy has grown into one of the UK's largest domestic energy suppliers and features a dedicated rewards programme called OVO Beyond.
Why choose them: Costing £130 more a year than the cheapest option, it records 1,725 complaints per 100,000 customers. It is best suited for those who value reward schemes over securing the lowest price or the fewest complaints.
Scottish Power
Who they are: Formed in 1990 and owned by Iberdrola, Scottish Power is one of the UK's largest domestic energy suppliers and operates the local electricity network in several parts of the country.
Why choose them: It offers two tariffs with no exit fees, providing excellent switching flexibility. However, it costs £130 more a year than the cheapest option and holds a lower Citizens Advice score of 2.94.
Good Energy
Who they are: Founded in 1999, Good Energy is a Chippenham-based green supplier that purchases electricity directly from independent renewable generators across the UK.
Why choose them: While it costs £114 more a year than the cheapest option, its 4.8 Trustpilot rating makes it highly attractive to households willing to pay a premium for direct renewable energy and excellent service.
So Energy
Who they are: Launched in 2015 as a challenger brand, So Energy is now majority-owned by Ireland's Electricity Supply Board (ESB).
Why choose them: Costing just £27 more a year than the cheapest option, it provides green tariffs. However, it registers 1,573 complaints per 100,000 customers, which is higher than several other suppliers in this comparison.
British Gas
Who they are: Part of the Centrica Group, British Gas is one of the UK's oldest and largest domestic energy suppliers.
Why choose them: Costing £52 more a year than the cheapest option, it offers one tariff with no exit fee. This makes it a solid choice if you prefer a familiar brand with the flexibility to switch penalty-free.
Utilita Energy
Who they are: Based in Hampshire, Utilita Energy launched in 2003 and specialises in smart pay-as-you-go energy rather than standard direct debit tariffs.
Why choose them: While it costs £130 more a year than the cheapest option and has a Citizens Advice score of 2.35, it remains a practical choice for households specifically seeking prepayment apps and features.
EDF Energy
Who they are: EDF Energy is the UK retail branch of the French state-owned EDF Group. As one of the UK's largest domestic suppliers, it focuses heavily on nuclear power.
Why choose them: Costing £80 more a year than the cheapest option, EDF Energy boasts a 4.8 Trustpilot rating. This makes it an appealing choice for those seeking a major supplier backed by strong customer reviews.
Utility Warehouse
Who they are: Founded in 2002, Utility Warehouse uses a bundling model to combine energy, broadband, and mobile phone plans into a single monthly bill.
Why choose them: It costs £30 more a year than the cheapest option and offers three tariffs with no exit fees. However, with the lowest service score in this ranking at 42, it is best suited for those who prioritise bundled convenience over top-tier service ratings.
Methodology
This page ranks energy suppliers using a composite score based on customer service metrics rather than tariff prices. The ranking relies on data available for August 2026, including only suppliers with qualifying evidence for that month. The prices displayed serve as representative context for households in the East Midlands paying by Monthly Direct Debit across fixed, variable, and tracker tariffs. Please note that actual energy costs will vary depending on your location and energy usage.
All ranked suppliers (14)
Suppliers ranked by the evidence criteria shown below.
| # | Supplier | Overall score | Customer service results | Estimated annual cost |
|---|---|---|---|---|
| 1 | 100Green | 90 | Citizens Advice 4.3/5 · Emails 90.9% · Calls 7 sec | £1,561/yr |
| 2 | Outfox Energy | 90 | Citizens Advice 4.3/5 · Emails 100.0% · Calls 1 min 17 sec | £1,481/yr |
| 3 | Ecotricity | 81 | Citizens Advice 3.4/5 · Emails 95.2% · Calls 45 sec | £1,502/yr |
| 4 | E.ON Next | 80 | Citizens Advice 3.7/5 · Emails 90.7% · Calls 2 min 3 sec | £1,546/yr |
| 5 | E Energy | 80 | Citizens Advice 3.2/5 · Emails 100.0% · Calls 1 min | — |
| 6 | Octopus Energy | 80 | Citizens Advice 3.7/5 · Emails 86.1% · Calls 1 min 17 sec | £1,598/yr |
| 7 | OVO Energy | 79 | Citizens Advice 3.3/5 · Emails 98.5% · Calls 1 min 33 sec | £1,611/yr |
| 8 | Scottish Power | 75 | Citizens Advice 2.9/5 · Emails 94.3% · Calls 1 min 16 sec | £1,611/yr |
| 9 | Good Energy | 75 | Citizens Advice 3.5/5 · Emails 79.3% · Calls 2 min 2 sec | £1,595/yr |
| 10 | So Energy | 74 | Citizens Advice 2.9/5 · Emails 91.3% · Calls 1 min 6 sec | £1,508/yr |
| 11 | British Gas | 74 | Citizens Advice 2.6/5 · Emails 97.9% · Calls 51 sec | £1,533/yr |
| 12 | Utilita Energy | 71 | Citizens Advice 2.4/5 · Emails 98.2% · Calls 1 min | £1,611/yr |
| 13 | EDF Energy | 69 | Citizens Advice 2.9/5 · Emails 85.6% · Calls 2 min 46 sec | £1,561/yr |
| 14 | Utility Warehouse | 42 | Citizens Advice 2.5/5 · Emails 40.5% · Calls 7 min 16 sec | £1,511/yr |
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Our verdict
100Green takes the top spot in this month's rankings with a composite customer service score of 90.
Outfox Energy follows closely with a score of 90 and provides the cheapest representative annual cost at £1,481, making it a strong choice for balancing price and service. Ecotricity and E.ON Next also perform well, scoring 81 and 80 respectively. Both providers offer green tariff options, with Ecotricity costing £21 more a year than the cheapest option and E.ON Next costing £65 more.
For those seeking the flexibility to switch without penalty, 100Green and Scottish Power each offer two tariffs with no exit fees, while Utility Warehouse offers three. Although Utility Warehouse costs just £30 more a year than the cheapest option, it sits at the bottom of this ranking with a service score of 42.
Frequently asked questions
Does a fixed energy tariff mean my bills will not change?
No. A fixed tariff only locks in your unit rates (pence per kWh) and your daily standing charge for the length of the contract. Your total bill will still rise or fall depending on how much gas and electricity you use.
Why are the suppliers with the best customer service not always the cheapest?
Suppliers that invest heavily in UK-based call centres, app development, and faster response times often have higher running costs. These costs are sometimes reflected in slightly higher energy rates.
What is a composite customer service score?
A composite score combines multiple data points into a single number. In this guide, it brings together Citizens Advice scores, call-wait times and email-response performance to give a clearer overall view of a supplier's service.
Can I switch away from my supplier if the customer service is poor?
Yes, you can switch supplier at any time. However, if you are on a fixed-term tariff, you may have to pay an exit fee to leave early. Check your contract details to see if a penalty applies before you switch.
How do I know if a supplier offers green energy?
Many suppliers offer specific green tariffs, while some match all their customers' electricity use with renewable energy. You can check a supplier's fuel mix on their website to see what percentage of their power comes from renewable sources like wind or solar.
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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