100Green EDF Energy (September 2026)
Overview
EDF Energy is the better choice for cheaper prices and a strong app, while 100Green leads heavily on customer service and green energy.
EDF Energy is cheaper in the tariffs compared and has a more established mobile app. However, 100Green may suit households prioritising customer service and green energy, as it ranks first in independent service metrics and records very short average call wait times.
About 100Green and EDF Energy
Who are 100Green?
100Green, previously known as Green Energy UK, started in 2001 and is an independent, privately owned supplier based in Hertfordshire. It is a smaller, specialist supplier that focuses entirely on green energy. A key difference is that it is the only UK supplier to offer 100% green gas to its customers. It also focuses on customer service, promising that real people answer the phone rather than automated menus, and it does not charge exit fees on its fixed tariffs.
Who are EDF Energy?
EDF Energy was formed in 2002 and is wholly owned by the French state-owned company Électricité de France. After buying British Energy in 2009, it became a major operator of nuclear power stations in the UK and is now one of the UK's largest domestic energy suppliers. A key difference is its status as Britain's biggest generator of zero-carbon electricity, which it uses to back many of its home energy tariffs. It also offers digital tools like the EDF app to help customers track their energy use.
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Tariffs and pricing
EDF Energy currently offers the lowest overall estimated cost in this comparison, coming in £106 a year cheaper than 100Green. Its most affordable option is the Standard (Variable) tariff, priced at £1,611 a year with no fixed term or exit fees. In comparison, 100Green's lowest-priced deal is the Exclusive Spring 100% Green 12M September 27 fixed tariff at £1,717 a year, which runs for 12 months and also carries no exit fees.
For households seeking a fixed rate, EDF Energy is £26 a year cheaper. Its Simply Fixed 2Yr Sep28v4 tariff is estimated at £1,691 a year for a 24-month term, though it includes a £200 exit fee. Conversely, 100Green’s most affordable fixed option lasts for 12 months and allows customers to switch away without penalty.
Among standard variable deals, EDF Energy works out £151 a year cheaper. Its variable tariff costs an estimated £1,611 a year, whereas 100Green's Sparkling SVT variable tariff is priced at £1,762 a year.
100Green and EDF Energy: Tariff Options
100Green tariffs
100Green offers a range of domestic tariffs, focusing on standard variable and fixed options alongside smart and export deals.
EDF Energy tariffs
EDF Energy offers household tariffs covering standard variable and fixed deals, as well as specialist options for electric vehicle owners, solar panel users, and prepayment customers.
Customer reviews
EDF Energy holds a higher Trustpilot score, achieving a 4.8-star rating from over 251,000 reviews, with 83% of these at five stars. 100Green maintains a 4.6-star rating based on 1,559 reviews, where 74% of respondents awarded it five stars.
Reviewers often note 100Green's quick response times and the ability to speak with advisors who resolve issues promptly, although a small portion cite occasional billing discrepancies. Feedback for EDF Energy frequently highlights polite staff and effective communication, while some users report difficulties navigating the supplier's automated phone systems.
In the annual Which? survey, 100Green achieves an overall score of 72, placing it ahead of EDF Energy at 58. 100Green receives 4 out of 5 for overall customer service and 3 out of 5 for value for money, whereas EDF Energy scores 2 out of 5 in both categories. Furthermore, 100Green scores 12 out of 15 for complaints handling, compared to 7 out of 15 for EDF Energy.
App quality and features
EDF Energy provides a more established mobile app, scoring 4.6 on the App Store from 187,000 ratings and 4.4 on Google Play from 51,073 ratings. 100Green scores 1.1 on iOS and 1.2 on Google Play; however, these figures are drawn from small samples of 21 and 32 ratings respectively, limiting direct comparison.
Recent iOS feedback for EDF Energy indicates that users appreciate the layout and regular updates, despite occasional reports of payment glitches. The small sample of reviews for 100Green's app leans negative, with users describing the interface as basic and noting a lack of account management features.
Both suppliers actively maintain their software. EDF Energy has released an update within the last two weeks focused on improving smart charging and EV features.
Customer service and support
100Green ranks 1st in the Citizens Advice table with a score of 4.33 out of 5. EDF Energy places 11th in the same assessment, scoring 2.9.
100Green reports shorter phone wait times, answering calls in 7 seconds on average, compared to 2 minutes 46 seconds for EDF Energy. Both suppliers respond to the majority of emails within two days: 100Green achieves this for 90.9% of inquiries, and EDF Energy for 85.6%. Additionally, 100Green replies to social media messages in an average of 55 seconds, whereas EDF Energy does not currently publish this specific metric.
100Green operates its phone lines from 8am to 8pm on weekdays, and from 9am to 1pm on Saturdays and Sundays. EDF Energy is open from 8am to 6pm Monday to Thursday, and 8am to 4pm on Fridays, remaining closed at the weekend. 100Green has also registered formal vulnerability commitments with Citizens Advice.
Complaints and performance
Complaint figures are shown with each supplier’s reporting period. No winner is declared when periods differ or one figure is missing.
Green Energy Comparison
100Green's green energy approach
According to Citizens Advice data for January to March 2026, 100Green supplies a 100% renewable electricity mix. It sources its electricity from wind, solar, and hydro generators, matched via REGO certificates. As well as this, it is the only UK supplier to offer 100% green gas, which is made up of biomethane tracked through the Green Gas Certification Scheme. The company does not use carbon offsetting, choosing instead to supply actual renewable energy and focus its sustainability investments on supporting independent renewable generators in the UK.[1]
EDF Energy's green energy approach
According to Citizens Advice data for January to March 2026, EDF Energy's electricity fuel mix is largely nuclear, with some fossil fuels and renewables. Because nuclear power does not produce carbon emissions at the point of generation, the company backs many of its tariffs with 100% zero-carbon nuclear electricity as standard. It is heavily involved in the UK's transition to net zero, leading the building of new nuclear plants like Hinkley Point C and investing in wind and solar projects.[2][3]
Our verdict
| If you care most about | Choose |
|---|---|
| The lowest annual cost on our assumptions | EDF Energy |
| Overall customer service | 100Green |
| A well-rated mobile app | EDF Energy |
| A greener fuel mix | 100Green |
EDF Energy is cheaper in the tariffs compared and has the stronger app ratings, while 100Green leads on customer service and green energy.
Based on the tariffs compared this month, EDF Energy offers lower estimated annual costs and provides an established mobile app for account management. Conversely, 100Green may appeal to households prioritising customer service, as it ranks 1st in the Citizens Advice table and reports an average call wait time of 7 seconds.
Households primarily focused on reducing their estimated annual bills may find EDF Energy more suitable, given its lower rates and established app. Those who prioritise independent service metrics, zero exit fees, or 100% renewable electricity and green gas may prefer 100Green.
- Ranks 1st in the Citizens Advice table
- Answers calls in an average of 7 seconds
- No exit fees on its cheapest fixed tariff
- Supplies 100% renewable electricity and 100% green gas
- Higher estimated costs across all tariff types in this comparison
- Low app ratings based on a small sample of users
- Lower estimated overall, variable, and fixed tariff costs
- Established mobile app with hundreds of thousands of reviews
- High proportion of five-star Trustpilot reviews
- £200 exit fee on its cheapest fixed tariff
- Lower Citizens Advice and Which? scores
- Phone lines are closed on weekends
Frequently asked questions
Which supplier is better overall?
EDF Energy offers cheaper tariffs in this comparison and a much better app experience. However, 100Green may be the better fit if you value excellent customer service, fast phone support and greener energy.
Who has the cheapest fixed tariff?
EDF Energy has the cheaper fixed deal in this comparison, but it comes with a £200 exit fee. 100Green's fixed tariff costs slightly more but charges no exit fees.
What do customers say about 100Green?
Customers frequently praise 100Green for its friendly staff and fast call answering, though a few mention occasional billing issues or slower interactions.
Does EDF Energy have a good app?
Yes, the EDF Energy app is highly rated on both iOS and Android, scoring 4.6 and 4.4 respectively across a huge number of reviews.
Who answers the phone faster?
100Green answers calls in just 7 seconds on average, which is much faster than EDF Energy's average wait time of 2 minutes 46 seconds.
Should I choose 100Green or EDF Energy?
Choose EDF Energy if you want to save money on your bills and manage your account through a good app. Choose 100Green if you prefer fast customer service and green energy.
Do either of these suppliers charge exit fees?
100Green does not charge exit fees on its cheapest fixed or variable tariffs. EDF Energy does not charge for its variable tariff, but its cheapest fixed deal carries a £200 exit fee.
Which supplier is greener?
100Green supplies 100% renewable electricity and 100% green gas. EDF Energy generates zero-carbon nuclear electricity but still uses some fossil fuels in its overall mix.
What changed this month
This month, EDF Energy's iOS app days since last update rose from 6 to 13, EDF Energy's play store days since last update rose from 7 to 14, and EDF Energy's cheapest tariff exit fee fell from £50 to £0. There were 29 other data changes this month — see the full changelog below for details.
Data changes this month (36)
100Green
- Trustpilot reviews1,539 → 1,559
- Trustpilot 4-star %12 → 11
- Trustpilot 1-star %7 → 8
- Trustpilot positive reviews %86 → 85
- Trustpilot negative reviews %10 → 11
- Trustpilot net-positive %76 → 74
- iOS app days since last update38 → 25
- Play Store rating1.2413793 → 1.2258065
- Play Store ratings count30 → 32
- Play Store days since last update38 → 26
- Play Store positive ratings %3.4 → 3.2
- Play Store negative ratings %93.1 → 93.5
- Play Store neutral ratings %3.4 → 3.2
- Play Store net-positive %-89.7 → -90.3
- Avg social media response timenow available (55)
- Cheapest variable tariff£1,975.79 → £1,761.9
- Cheapest fixed tariff£1,748.8 → £1,717.28
- Cheapest tariff£1,748.8 → £1,717.28
EDF Energy
- Trustpilot reviews243,334 → 251,360
- iOS app ratings count185,000 → 187,000
- iOS app days since last update6 → 13
- iOS sampled reviews avg stars2 → 2.33
- Play Store rating4.4256063 → 4.3837585
- Play Store ratings count50,315 → 51,073
- Play Store days since last update7 → 14
- Play Store positive ratings %86.3 → 85.2
- Play Store negative ratings %9.8 → 10.6
- Play Store neutral ratings %3.9 → 4.2
- Play Store net-positive %76.5 → 74.6
- Cheapest variable tariff£1,754.76 → £1,610.88
- Cheapest fixed tariff£1,824.37 → £1,691.28
- Cheapest tariff£1,754.76 → £1,610.88
- Cheapest tariff exit fee£50 → £0
- Cheapest fixed tariff exit fee£150 → £200
- Tariff count4 → 3
- Variable tariffs available2 → 1
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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.