Best Energy Suppliers for Customer Service in the UK (September 2026)
100Green ranks first on the qualifying September evidence at 90/100.
Overview
Quick summary
14 suppliers had qualifying evidence for September 2026. Suppliers are ordered using Citizens Advice score, the percentage of emails answered within two days and average call-centre waiting time. 100Green ranked first at 90/100. Tariff prices are shown only as supporting context and do not affect this score.
Top suppliers this month
- ★ #1 TOP PICK100Green90score out of 100
- #2Outfox Energy90score out of 100
- #3Ecotricity81score out of 100
#1 100Green: 90/100. Citizens Advice 4.3/5; emails answered within two days 90.9%; average call-centre wait 7 seconds. For price context, Exclusive Spring 100% Green 12M September 27 was £1,717 a year under the common usage, region and payment assumptions.
#2 Outfox Energy: 90/100. Citizens Advice 4.3/5; emails answered within two days 100%; average call-centre wait 77 seconds. For price context, Outfox the Price Cap Tracker 12M Dual - V3 was £1,481 a year under the common usage, region and payment assumptions.
#3 Ecotricity: 81/100. Citizens Advice 3.4/5; emails answered within two days 95.2%; average call-centre wait 45 seconds. For price context, EcoFixed - 2 Year August 26 v4 was £1,559 a year under the common usage, region and payment assumptions.
Supplier highlights
100Green
TOP PICKWho they are: 100Green had enough September evidence to be included in this ranking.
Why choose them: It ranked 1st with 90/100. Citizens Advice 4.3/5; emails answered within two days 90.9%; average call-centre wait 7 seconds. For price context, Exclusive Spring 100% Green 12M September 27 was £1,717 a year under the common usage, region and payment assumptions.
Outfox Energy
Who they are: Outfox Energy had enough September evidence to be included in this ranking.
Why choose them: It ranked 2nd with 90/100. Citizens Advice 4.3/5; emails answered within two days 100%; average call-centre wait 77 seconds. For price context, Outfox the Price Cap Tracker 12M Dual - V3 was £1,481 a year under the common usage, region and payment assumptions.
Ecotricity
Who they are: Ecotricity had enough September evidence to be included in this ranking.
Why choose them: It ranked 3rd with 81/100. Citizens Advice 3.4/5; emails answered within two days 95.2%; average call-centre wait 45 seconds. For price context, EcoFixed - 2 Year August 26 v4 was £1,559 a year under the common usage, region and payment assumptions.
E.ON Next
Who they are: E.ON Next had enough September evidence to be included in this ranking.
Why choose them: It ranked 4th with 80/100. Citizens Advice 3.7/5; emails answered within two days 90.7%; average call-centre wait 123 seconds. For price context, Next Fixed 24m Exclusive v11 was £1,510 a year under the common usage, region and payment assumptions.
E Energy
Who they are: E Energy had enough September evidence to be included in this ranking.
Why choose them: It ranked 5th with 80/100. Citizens Advice 3.2/5; emails answered within two days 100%; average call-centre wait 60 seconds. No comparable tariff price was available under the common price filters.
Octopus Energy
Who they are: Octopus Energy had enough September evidence to be included in this ranking.
Why choose them: It ranked 6th with 80/100. Citizens Advice 3.7/5; emails answered within two days 86.1%; average call-centre wait 77 seconds. For price context, Flexible Octopus was £1,598 a year under the common usage, region and payment assumptions.
OVO Energy
Who they are: OVO Energy had enough September evidence to be included in this ranking.
Why choose them: It ranked 7th with 79/100. Citizens Advice 3.3/5; emails answered within two days 98.5%; average call-centre wait 93 seconds. For price context, Simpler Energy was £1,611 a year under the common usage, region and payment assumptions.
Scottish Power
Who they are: Scottish Power had enough September evidence to be included in this ranking.
Why choose them: It ranked 8th with 75/100. Citizens Advice 2.9/5; emails answered within two days 94.3%; average call-centre wait 76 seconds. For price context, Standard was £1,611 a year under the common usage, region and payment assumptions.
Good Energy
Who they are: Good Energy had enough September evidence to be included in this ranking.
Why choose them: It ranked 9th with 75/100. Citizens Advice 3.5/5; emails answered within two days 79.3%; average call-centre wait 122 seconds. For price context, Good Energy Standard was £1,710 a year under the common usage, region and payment assumptions.
So Energy
Who they are: So Energy had enough September evidence to be included in this ranking.
Why choose them: It ranked 10th with 74/100. Citizens Advice 2.9/5; emails answered within two days 91.3%; average call-centre wait 66 seconds. For price context, So Green Tracker 24m was £1,508 a year under the common usage, region and payment assumptions.
British Gas
Who they are: British Gas had enough September evidence to be included in this ranking.
Why choose them: It ranked 11th with 74/100. Citizens Advice 2.6/5; emails answered within two days 97.9%; average call-centre wait 51 seconds. For price context, Cap Tracker Plus Sep27 v1 was £1,551 a year under the common usage, region and payment assumptions.
Utilita Energy
Who they are: Utilita Energy had enough September evidence to be included in this ranking.
Why choose them: It ranked 12th with 71/100. Citizens Advice 2.4/5; emails answered within two days 98.2%; average call-centre wait 60 seconds. For price context, Smart Energy was £1,611 a year under the common usage, region and payment assumptions.
EDF Energy
Who they are: EDF Energy had enough September evidence to be included in this ranking.
Why choose them: It ranked 13th with 69/100. Citizens Advice 2.9/5; emails answered within two days 85.6%; average call-centre wait 166 seconds. For price context, Standard (Variable) was £1,611 a year under the common usage, region and payment assumptions.
Utility Warehouse
Who they are: Utility Warehouse had enough September evidence to be included in this ranking.
Why choose them: It ranked 14th with 42/100. Citizens Advice 2.5/5; emails answered within two days 40.5%; average call-centre wait 436 seconds. For price context, UW Tracker Saver 5 was £1,511 a year under the common usage, region and payment assumptions.
Methodology
This page uses September 2026 evidence and orders suppliers by Citizens Advice score, the percentage of emails answered within two days and average call-centre waiting time. Missing criteria are not silently estimated. The annual tariff figure is supporting price context and is not part of the score. All price figures use a representative East Midlands postcode, Monthly Direct Debit and the stated Ofgem medium-use assumptions. Electricity-only, gas-only and dual-fuel rows may appear; readers should compare like with like and obtain a personalised quote before switching.
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 | £1,717/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 | £1,559/yr |
| 4 | E.ON Next | 80 | Citizens Advice 3.7/5 · Emails 90.7% · Calls 2 min 3 sec | £1,510/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 | £1,710/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 | £1,551/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 | £1,611/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 ranks first on this page’s September evidence.
100Green scores 90/100 using Citizens Advice score, the percentage of emails answered within two days and average call-centre waiting time.
Use the evidence rows alongside price and tariff terms; a higher score is not a guarantee that a supplier is the best fit for every household.
Frequently asked questions
How is this page ranked?
Suppliers are ranked using Citizens Advice score, the percentage of emails answered within two days and average call-centre waiting time. Missing evidence is shown or excluded according to the stated rule rather than being guessed.
Are these personalised prices?
No. Prices use an East Midlands representative postcode, Monthly Direct Debit and Ofgem medium-use assumptions. Your quote can differ with location, usage, meter and eligibility.
Does a variable or tracker tariff always have no exit fee?
No. Tariff type, contract term and exit fee are separate. Check the named tariff’s term and exit fee before switching.
Why can rankings move sharply between months?
The monthly table is rebuilt from the qualifying evidence available for that month. A tariff entering, leaving or changing price, or a rating or service measure changing, can move a supplier or tariff several places.
What does missing data mean?
It means the relevant comparable figure was not present under this page’s filters. Missing values are not estimated; check the supplier directly for current availability and a personalised quote.
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
This month, cheapest annual cost fell from £1,561 to £1,481.
Data changes this month (1)
- Cheapest annual cost£1,561 → £1,481
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