100Green E.ON Next (September 2026)
Overview
There is no single best choice: compare price, service, app and green-energy evidence separately.
About 100Green and E.ON Next
Who is 100Green?
100Green is an independent, privately owned energy supplier based in Hertfordshire. Set up in 2001, it is one of the UK's smaller domestic suppliers. It focuses on environmental impact and customer service, offering renewable electricity and at least 10% green gas as standard. Because it costs more to buy fully renewable energy, 100Green holds a special exemption from the Ofgem price cap.
Who are E.ON Next?
E.ON Next is the home energy brand of E.ON UK, part of the wider E.ON group. Launched in 2020, it grew by taking on customers from npower and is now one of the UK's largest domestic suppliers. It runs its customer accounts on the Kraken platform. In 2026, E.ON announced a planned takeover of OVO Energy, which would increase its scale if approved. As well as energy, it installs home technology like solar panels and heat pumps.
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Tariffs and pricing
E.ON Next's lowest-priced available tariff is the Next Fixed 24m Exclusive v11 at £1,510 a year, coming in £208 a year cheaper than 100Green's most affordable option. For comparison, 100Green's lowest-priced deal is the Exclusive Spring 100% Green 12M September 27 fixed tariff, which costs £1,717 a year.
While E.ON Next offers the lower headline price, this deal requires a 24-month commitment and includes a £200 exit fee. In contrast, 100Green's tariff features a shorter 12-month term with no exit fees applied.
For households seeking a variable option, E.ON Next's most affordable variable deal is the Next Pledge Tracker 12m v12 at £1,560 a year. 100Green's equivalent Sparkling SVT variable tariff is priced at £1,762 a year.
Tariff Options
100Green tariffs
100Green offers a focused range of domestic tariffs, including standard variable and fixed options. It also provides specialist tariffs for homes with smart meters or solar panels.
E.ON Next tariffs
E.ON Next provides a wide selection of tariffs for households. The range covers standard variable and fixed deals, alongside a tracker tariff and specialist options for electric vehicle owners, heat pump users, and homes with solar panels.
Customer reviews
Both suppliers hold positive Trustpilot ratings. 100Green scores 4.6 out of 5 from 1,559 reviews, while E.ON Next scores 4.5 out of 5 based on a significantly larger volume of over 225,000 reviews. Approximately 74% of 100Green's reviews and 75% of E.ON Next's reviews award five stars.
Feedback for 100Green frequently mentions polite staff, rapid phone responses, and straightforward switching, though a minority note slow interactions or billing discrepancies. E.ON Next customers often highlight helpful representatives and professional engineers, alongside some complaints regarding rising costs and communication gaps.
In the annual Which? survey, 100Green achieves an overall score of 72 out of 100, compared to E.ON Next's 66. E.ON Next receives 9 out of 10 for helping those who need it, whereas 100Green scores 4 out of 10 in this specific category. Conversely, 100Green scores 9 out of 12 for contacting your supplier, placing it ahead of E.ON Next's 7 out of 12.
App quality
E.ON Next provides a functional Android application, scoring 4.3 out of 5 on the Google Play Store across more than 16,000 ratings. Current iOS app data for E.ON Next is unavailable in this comparison.
100Green's applications record low scores of 1.1 on iOS and 1.2 on Android, though both figures are drawn from small samples of fewer than 50 ratings. This limits direct comparability with E.ON Next's larger dataset. A recent sample of 100Green iOS reviews indicates users find the app basic, difficult to navigate, and lacking in accessibility features.
Service and support
100Green ranks first among all suppliers in Citizens Advice data, achieving a score of 4.33 out of 5. E.ON Next places third with a score of 3.71. When contacting customer service, 100Green answers phone calls in an average of 7 seconds, compared to 2 minutes 3 seconds for E.ON Next.
Both suppliers reply to over 90% of emails within two days. Additionally, 100Green responds to social media messages in an average of 55 seconds—a metric E.ON Next does not currently publish. Both companies have registered formal vulnerability commitments with Citizens Advice.
For weekend support, 100Green operates its phone lines on Saturday and Sunday from 9am to 1pm. E.ON Next's phone lines remain closed during the weekend.
Complaints and performance
The complaints data for 100Green and E.ON Next covers different time periods, so we cannot make a direct comparison. 100Green received 144 complaints per 100,000 customers in the first quarter of 2026. E.ON Next received 760 complaints per 100,000 customers in the second quarter of 2026.
Data on how fast 100Green resolves complaints is not available. For E.ON Next, the supplier resolved 49.61% of complaints by the end of the next working day, and 89.69% within eight weeks.
We do not have data on the main reasons customers complained to 100Green. For E.ON Next, the most common reason for complaints was customer service, making up 32.28% of the total. Other common issues included payments (12.16%) and general billing and meter reading issues (11.19%).
Green Energy Comparison
100Green's green energy
According to Citizens Advice, 100Green supplies a 100% renewable electricity mix. It is the only UK domestic supplier to offer an eco-labelled tariff with 100% green gas. Instead of using carbon offsetting schemes, it supplies biomethane made from organic waste through anaerobic digestion. The supplier also offers a premium tariff backed by the EKOenergy ecolabel, which ensures the energy meets strict sustainability standards.
E.ON Next's green energy
E.ON Next supplies a mostly renewable electricity mix, with some fossil fuels and a small amount of nuclear and other sources. For customers wanting a fully green supply, it offers a specific 100% renewable electricity tariff called Next Gust, which is backed by agreements with UK wind generators. The supplier also focuses on helping homes reach net zero by offering smart technology and energy efficiency grants. It partners with the Woodland Trust, pledging money to help restore ancient woodlands when customers sign up for a fixed tariff.[1]
Our verdict
| If you care most about | Choose |
|---|---|
| The lowest annual cost on our assumptions | E.ON Next |
| Overall customer service | 100Green |
| A greener fuel mix | 100Green |
There is no single best choice: compare price, service, app and green-energy evidence separately.
Use the decision table to match the available evidence to the factors that matter most to your household.
- Cheapest variable tariff at £1,762 / year
- 4.6 Trustpilot from 1,559 reviews
- Top-1 Citizens Advice ranking
- 91% of emails answered within 2 days
- 94% of Google Play ratings are negative
- Cheapest variable tariff at £1,560 / year
- 4.5 Trustpilot from 225,716 reviews
- Top-3 Citizens Advice ranking
- 91% of emails answered within 2 days
- Cheapest overall tariff carries a £200 exit fee
- 14% of Google Play ratings are negative
Frequently asked questions
Which is cheaper, 100Green or E.ON Next?
On the stored annual-cost assumptions, 100Green is £1,717 and E.ON Next is £1,510. E.ON Next is lower by about £208 a year.
Can 100Green and E.ON Next complaint rates be compared directly?
No direct complaint-rate winner is declared because 100Green and E.ON Next do not both have figures for the same stated reporting period.
Which supplier leads on customer service?
On the comparable customer-service measure used in the decision table, 100Green leads.
Which supplier has the better app evidence?
The supplied data does not support a like-for-like app winner.
Do tariff eligibility rules matter?
Yes. Specialist, time-of-use, EV, heat-pump and export tariffs can have equipment, meter or account requirements. Check the current supplier terms before applying.
Which supplier has the greener evidence?
On the comparable green-energy measure used in the decision table, 100Green leads. This row is based on published fuel-mix percentages.
Which is better overall, 100Green or E.ON Next?
There is no single overall winner in this repaired draft. Price, service, app and green-energy evidence are kept as separate choices in the decision table.
When was this comparison updated?
The structured source payload is for September 2026.
What changed this month
This month, E.ON Next's iOS app updates in last 90 days fell from 3 to 0, E.ON Next's iOS sampled neutral reviews fell from 1 to 0, and 100Green's iOS app days since last update fell from 38 to 25. There were 31 other data changes this month — see the full changelog below for details.
Data changes this month (38)
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
E.ON Next
- Trustpilot reviews219,212 → 225,716
- Trustpilot 5-star %74 → 75
- Trustpilot 4-star %12 → 11
- iOS app rating4.8 → no longer available
- iOS app ratings count49,000 → no longer available
- iOS app days since last update4 → no longer available
- iOS app updates in last 90 days3 → 0
- iOS sampled reviews avg stars3 → no longer available
- iOS sampled neutral reviews1 → 0
- Play Store rating4.324643 → 4.340909
- Play Store ratings count16,070 → 16,278
- Play Store days since last update5 → 4
- Play Store positive ratings %82.6 → 83.1
- Play Store negative ratings %14.2 → 13.8
- Play Store net-positive %68.4 → 69.3
- Cheapest variable tariff£1,747 → £1,560.38
- Cheapest fixed tariff£1,745.58 → £1,509.55
- Cheapest tariff£1,745.58 → £1,509.55
- Tariff count5 → 6
- Fixed tariffs available3 → 4
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100Green Review
100Green, formerly known as Green Energy UK, is an independent energy supplier based in Hertfordshire. Founded in 2001, it is one of the UK's oldest green energy suppliers and operates as a smaller domestic supplier.
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E.ON Next Review
E.ON Next is the home energy brand of the wider E.ON group. It was set up to replace the older E.ON brand and npower after E.ON bought the company. Today, it is one of the UK's biggest domestic energy suppliers.
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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.