100Green E.ON Next (November 2026)
Contents
100Green vs E.ON Next at a glance
E.ON Next shows the lower prices, while 100Green leads on customer service ratings and phone waits, so the better pick depends on which matters more to you.
Neither supplier wins overall because each leads on something different. E.ON Next has the lower prices shown: its Next Pledge Tracker 12m v12 costs £1,622 a year, which is £165 less than 100Green's cheapest deal, the Sparkling SVT at £1,787. 100Green does better on service. Its Which? total score is 72% against 66%, customers rated its customer service 4 out of 5 against 2 out of 5 for E.ON Next, and its average call centre wait was 7 seconds compared with 1 minute 57 seconds. The better pick depends on whether a lower bill or easier contact matters more to you.
Contract terms also differ. None of the four 100Green deals priced here has an exit fee, while E.ON Next's tracker and fixed deals shown carry exit fees of £50 to £200, although its Next Flex variable tariff has none. Trustpilot ratings are close, at 4.6 for 100Green and 4.5 for E.ON Next, so reviews alone do not split them.
About 100Green and E.ON Next
Who are 100Green?
100Green is the trading name of Green Energy (UK) Ltd, a company registered in England with its registered office in Ware, Hertfordshire. It was formerly known as Green Energy UK. It is a small supplier: in its 2025 awards, Uswitch grouped it with suppliers that have less than 1% of the market.
Its approach is built on knowing where its power comes from. It focuses on renewably sourced energy from the UK only, which means no nuclear power. 100Green says it buys from small British hydro, wind and solar generators that it knows by name, drawn from a portfolio of independent generators across the UK. It also runs a phone-first service with a UK-based team and no call menus or automated queues. It is a member of the Energy Switch Guarantee, which aims to raise standards when people switch.
Products & services
Awards & recognition
Who are E.ON Next?
E.ON Next Energy Limited is registered in England and Wales as company number 03782443, with its registered office at Trinity House in Nottingham. It carries the E.ON name, and its help centre has a dedicated guide for customers joining from E.ON as their accounts move across. The company says it now looks after over 5 million customers.
Its stated aim is to make energy 'less hassle and more convenient for everyone'. Customers deal with teams it calls Energy Specialists. It has also signed up to the Energy Switch Guarantee, which promises a safe and speedy switch. It bills monthly rather than quarterly, because it says this helps people keep an eye on their account and avoid an unexpected large bill.
Products & services
Awards & recognition
- [1] 100green.com: registered in England
- [2] Uswitch.com: formerly known as Green Energy UK
- [3] 100green.com
- [4] 100green.com: portfolio of independent generators
- [5] 100green.com: phone-first service
- [6] E.ON Next: registered in England and Wales
- [7] E.ON Next: customers joining from E.ON
- [8] E.ON Next: over 5 million customers
- [9] E.ON Next: 'less hassle and more convenient for everyone'
- [10] E.ON Next: Energy Specialists
Use our referral link, and we'll both get £50 credit once your switch is complete.
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Tariffs and prices
Eligibility
Requires payment by Direct Debit and a smart meter installation where possible
The lowest annual estimate shown for E.ON Next is the Next Pledge Tracker 12m v12, a tracker tariff at £1,622 a year. For 100Green, it is the Sparkling SVT, a standard variable tariff at £1,787 a year. That makes the E.ON Next deal £165 a year cheaper, or about £14 a month.
The two deals work differently. The Sparkling SVT is a variable tariff with no exit fee, so its rates can change but you can leave without paying a penalty. The Next Pledge Tracker is a tracker rather than a standard variable tariff, so its rates can also change, but it comes with a 12-month contract and a £50 exit fee if you leave early. If you would rather avoid an exit fee with E.ON Next, its Next Flex standard variable tariff is priced at £1,672 a year with no exit fee, which is still £115 a year less than the Sparkling SVT.
On fixed deals, E.ON Next's Next Fixed 12m v164 costs £1,884 a year for a 12-month fix. That is £89 a year, or about £7 a month, less than 100Green's cheapest fixed deal shown, Exclusive Spring 100% Green 12M November 27, at £1,973 a year for 12 months. The trade-off is the exit fee: £100 on the E.ON Next deal and £0 on the 100Green one. None of the four 100Green deals priced here has an exit fee.
E.ON Next also has a 24-month fix, Next Fixed 24m v80, at £1,895 a year with a £200 exit fee. It may suit households who want two years of set rates, but leaving early costs more. All the deals priced here for both suppliers are paid by monthly Direct Debit.
| Metric | 100Green | E.ON Next |
|---|---|---|
| Exit fee on cheapest tariff | £0 | £50 |
| Exit fee on cheapest fixed tariff | £0 | £100 |
100Green and E.ON Next: tariff options
100Green
Most households will choose between the Sparkling tariffs, which both come with UK-generated renewable electricity and green gas if you need it. Sparkling Guarantee fixes your unit rates for 12 months, so your bill only changes with how much energy you use. Sparkling Variable, shown in our price table as Sparkling SVT, follows the wholesale market instead, and 100Green writes to you 30 days before any price change. It is exempt from the price cap because it supports renewable generation, so its rates may be above or below the cap at different times. Two other 12-month fixed deals, Exclusive Spring 100% Green 12M November 27 and Stream Fixed - November 27, also appear in our price data.
100 Origin suits households that want their heating covered as well as their electricity. It has fixed rates, carries the EKOenergy ecolabel and matches all of your electricity with renewables and all of your gas with certified UK green gas.
The Tide tariffs charge different electricity prices at different times of day, and they need a smart meter. If you don't have one, 100Green suggests starting on a standard tariff, asking for a free upgrade and switching once the meter is fitted. If you take gas as well, it costs the same at any time of day. Tide Smart has variable prices, while Tide EV and Tide Lifestyle have rates guaranteed for 12 months.
If you generate your own renewable electricity, the Export Tariff pays for what you send to the grid. You have to apply with documents such as your MCS certificate, and the whole sign-up can take up to eight weeks.
E.ON Next
Next Flex is the standard variable tariff. Its prices can move with wholesale costs, and E.ON Next gives at least 30 days' notice of a change. You can move to a fixed deal at any time. Next Fixed locks the unit rate and standing charge for 12 or 24 months. This protects you from price cap rises, but you miss out if the cap falls. The 24-month edition has a larger exit fee than the 12-month one, so it costs more to leave early. Choosing a fixed tariff also triggers a one-off donation to the Woodland Trust on your behalf.
Next Pledge sits in between. Its rates follow the Ofgem price cap but are always set below it, over a 12-month fixed term paid by Direct Debit. Leaving for another supplier early brings an exit fee, but moving to another E.ON Next tariff does not.
The smart tariffs pay off when you can move electricity use into cheaper hours. Next Drive Fixed and Next Drive Smart both give the whole home off-peak rates from midnight to 6am. Next Drive Smart also schedules charging automatically through the E.ON Next Home app when your car is plugged in. For this you need an eligible electric vehicle and charger and a smart meter sharing half-hourly readings.
Next Pumped suits homes with a heat pump or electric boiler, or homes planning to install one. Its cheapest hours are overnight, with a 4pm to 7pm peak. It needs a smart meter sharing half-hourly readings, monthly Direct Debit and online account management. It is not open to Smart Pay As You Go customers. Next Smart Saver gives cheaper rates for most of the day and night, so it suits homes that can keep heavy use out of the early evening. Next Drive Smart and Next Smart Saver are advertised with no exit fees. E.ON Next customers can also get up to £30 off an EV home charger and up to £200 off solar panels and batteries or a heat pump.
For solar and battery owners, Next Optimise changes the unit rate every half hour in line with wholesale prices. It lets the app decide when the battery charges or exports, so savings are not guaranteed. Next Solar Storage Steady is a 12-month fixed alternative with set import and export windows. It is open only to existing E.ON Next customers while it is in beta. E.ON Next also offers an exclusive Smart Export Guarantee tariff on a 12-month fixed-term contract.
Eligibility
Requires payment by Direct Debit and a smart meter installation where possible
Eligibility
An eligible electric vehicle and charger, with smart control through a compatible vehicle or charger; A smart meter with consent to half-hourly readings
Eligibility
A heat pump or electric boiler at home, or plans to install one; A working smart meter, or willingness to have one fitted, with half-hourly readings collected; Monthly Direct Debit and online account management; Not available to Smart Pay As You Go customers
Eligibility
Designed for homes with solar panels and a home battery. Eligibility is checked before E.ON Next sends a quote.
Eligibility
Only available to existing E.ON Next customers while in beta. Built for homes with solar panels and a battery that the app can control; E.ON Next sends a quote if you are eligible.
Customer reviews
On Trustpilot the two suppliers are close. 100Green has a rating of 4.6 from 1,594 reviews and E.ON Next has 4.5 from 243,581 reviews, so E.ON Next's score rests on far more feedback. The spread of reviews is almost the same: 74% of 100Green reviews and 75% of E.ON Next reviews are five-star, while 8% and 9% are one-star. Both reply to most negative reviews, 90% for 100Green and 99% for E.ON Next, with E.ON Next typically replying within 24 hours and 100Green within 48 hours.
100Green reviewers mostly praise its staff. Customers describe friendly, knowledgeable agents who answer the phone quickly, explain account processes clearly and sort out problems without delay, and response times and problem solving come up often. The main complaints are about higher bills and unexpected pricing, while some reviewers mention mistakes on their accounts.
E.ON Next reviewers often praise engineers who arrive on time and complete smart meter and other installations smoothly, along with an easy switching process and helpful staff who answer queries quickly. Criticism centres on high bills, unexpected charges and refunds, as well as delays and confusing answers when trying to fix account problems.
Which? results lean towards 100Green on service. Its Which? total score is 72% against 66% for E.ON Next, and customers rated 100Green's overall customer service 4 out of 5 against 2 out of 5. In the Which? supplier assessment, 100Green also scored 12 out of 15 for complaints performance against 8 for E.ON Next. E.ON Next scored higher for help for those who need it (9 out of 10 against 4) and for smart meters (8 out of 10 against 6). Both scored low for switching, with 100Green on 1 out of 5 and E.ON Next on 2.
App ratings and features
E.ON Next's app is rated 4.8 on the App Store from 51,000 ratings and 4.4 on Google Play from 16,706 ratings, with more than a million installs on Android. E.ON Next says the app lets customers view or download their bills, make payments, set up a monthly Direct Debit, update bank details and track their energy use.
Individual users have still reported problems. One iPhone user said the usage charts show each month on its own rather than a trend over time, and another said the app sometimes logs them out even with Face ID turned on.
100Green's app scores 1.2 on the App Store from 25 ratings and 1.2 on Google Play from 34 ratings. Because these scores rest on so few ratings, they are too small a sample to compare fairly with E.ON Next's tens of thousands. One iPhone user said electricity use can be viewed by day, week or month, but gas use only by month and only for the previous month. Another said payment settings can't be changed in the app and bills have to be downloaded before they can be viewed.
Customer service and support
Average response: 7 sec (April to June 2026)
Average response: 2 min (April to June 2026)
Hours: 9am - 5pm Monday to Thursday, 9am - 4pm Friday
Replies: 98.4% within 2 days (April to June 2026)
Replies: 91.4% within 2 days (April to June 2026)
Average response: 51 sec (April to June 2026)
Hours: Available
Replies: 100% within 2 days (April to June 2026)
Citizens Advice scores the two suppliers closely for April to June 2026: 100Green scored 3.9 out of 5 and ranked 2nd, while E.ON Next scored 3.71 and ranked 3rd. The overall gap is small, but the contact measures behind it show clearer differences.
100Green's average call centre wait was 7 seconds, compared with 1 minute 57 seconds at E.ON Next. 100Green also answered more emails within two days, 98.4% against 91.4%. Figures for other channels are not directly comparable: 100Green's average webchat response time was 51 seconds, while E.ON Next answered 100% of WhatsApp messages within two days. E.ON Next's routine phone lines are open 9am to 5pm Monday to Thursday and 9am to 4pm on Friday.
Both suppliers base nearly all smart meter bills on actual readings: 99.78% for 100Green and 98.51% for E.ON Next. The gap is wider for traditional meters, where 99.95% of 100Green's bills used actual readings against 93.58% at E.ON Next. So E.ON Next customers without a smart meter are more likely to get a bill based on an estimate.
Smart meter reliability points the other way. At E.ON Next, 94.82% of smart meters were working, against 86.05% at 100Green, which matters if you rely on a smart meter for accurate bills or time-of-day pricing.
| Billing and metering | 100Green — April to June 2026 | E.ON Next — April to June 2026 |
|---|---|---|
| Smart meters working correctly | 86.05% | 94.82% |
| Bills based on readings — smart meters | 99.78% | 98.51% |
| Bills based on readings — traditional meters | 99.95% | 93.58% |
Complaints and how they are handled
There are two separate complaint measures here. The first is the number of complaints each supplier reports receiving directly. The second comes from Citizens Advice and counts complaints people took to advice bodies and the Energy Ombudsman. The two use different bases, so they cannot be swapped or added together. Both suppliers' own figures cover Q2 2026, and both Citizens Advice figures cover April to June 2026, so each measure can be compared between the two suppliers.
In Q2 2026, 100Green reported 90 complaints per 100,000 customer accounts. E.ON Next reported 760. So in the same quarter, E.ON Next received more than eight times as many complaints per customer account as 100Green. These figures count complaints made, not the number of customers who complained. One person can complain more than once, and one household can hold more than one account.
E.ON Next resolved 49.61% of complaints by the end of the next working day and 89.69% within eight weeks in Q2 2026. That means about half were sorted out almost straight away, and about one in ten were not resolved within eight weeks. These figures show how quickly complaints were closed, not whether customers were happy with the outcome. No resolution figures were available for 100Green, so you cannot compare how quickly the two suppliers deal with complaints.
Citizens Advice figures count complaints taken outside the supplier, to advice bodies or the Energy Ombudsman. For April to June 2026, 100Green had 22.8 such complaints per 10,000 customers and E.ON Next had 27.1. On this measure 100Green is again lower, but the gap is much smaller than in the suppliers' own figures.
E.ON Next's breakdown of its main complaint reasons gives only the category and its share of complaints. No period is stated for these figures, and no details are given about the problems or what E.ON Next is doing about them. Customer service makes up the largest share, at about a third. No breakdown of complaint reasons was available for 100Green, so the types of problems cannot be compared.
100Green and E.ON Next: green energy
100Green
Every 100Green tariff comes with UK-generated, 100% renewable electricity. The company says it buys directly from small British hydro, wind and solar generators, such as a small dairy farm in Norfolk. It also offers generators power purchase agreements. These are contracts to buy the electricity a generator feeds into the national grid, and 100Green asks those generators to be eligible for REGO certificates.
A REGO (Renewable Energy Guarantee of Origin) is a certificate issued for each megawatt hour of electricity made from a renewable source. 100Green says it holds a REGO for every megawatt hour it supplies, and Ofgem audits this every year. All homes draw from the same shared grid, so these contracts and certificates match your use with renewable generation rather than sending particular power to your home.
100Green also buys spare electricity from households that make their own. One customer of more than 20 years, Professor Susan Roaf, built Britain's first solar roof in the early 1990s. 100Green buys her extra power and supplies her when she needs more. Through its partnership with Energy Local, it links communities with nearby renewable generation and handles the regulation, billing and licensing for them.
On gas, all 100Green tariffs have at least 10% green gas certification, backed by Renewable Gas Guarantees of Origin and the Green Gas Certification Scheme. The 100 Origin tariff goes further and matches all of your gas with certified green gas, made in the UK from biowaste and organic residues. 100Green also offers gas purchase agreements, which pay producers for the biogas they put into the gas grid.
100 Origin is certified by EKOenergy, an ecolabel run by a non-profit network of environmental organisations. Its rules have three main parts. Wind and solar sites must be outside protected nature areas and important bird areas. Hydro schemes must keep water flowing and allow for fish migration. Bioenergy must come only from organic waste and certain woody materials, with no energy crops.
An annual audit checks that the 100 Origin energy sold meets these rules. A contribution for each megawatt hour sold also goes to the EKOenergy Climate Fund, which pays for clean energy projects in remote communities in developing countries.
E.ON Next
E.ON Next's fuel mix disclosure for 1 April 2025 to 31 March 2026 covers all the electricity supplied under its licences, to homes, small businesses and corporate customers together. Most of that supply came from fossil fuels, with 53.2% from natural gas and 9.3% from coal. Renewable sources made up 27.3%, nuclear 5.8% and other sources 4.4%.
That mix is less renewable than the UK average for the same period, which E.ON Next lists as 48% renewable and 13.7% nuclear. Its own supply comes with carbon dioxide emissions of 322 grams per kilowatt hour, compared with 179 for the national average.
Renewable Energy Guarantees of Origin, or REGOs, are certificates issued under an Ofgem scheme. Generators get one for each megawatt hour of renewable electricity they produce, and E.ON Next says all the renewable electricity it sells is backed by REGOs. The certificates show that enough renewable power was produced to match what is sold. They do not change the physical power reaching your home, which still comes from the National Grid.
The clearest household promise comes with Next Pumped, the heat pump tariff. Its electricity is backed by 100% renewable sources. These come from E.ON's renewable assets, agreements with independent UK generators and buying renewable electricity certificates. That promise belongs to Next Pumped, not to every E.ON Next tariff.
E.ON Next also says it generates its own renewable electricity. It points to biomass plants in Lockerbie and Sheffield, which it says make enough energy for 100,000 homes across the UK. Biomass plants make electricity by burning organic material rather than fossil fuels.
Our verdict
| If you care most about | Choose |
|---|---|
| The lowest annual price shown here | E.ON Next |
| Shorter call waits and stronger customer service ratings | 100Green |
E.ON Next shows the lower prices, while 100Green leads on customer service ratings and phone waits, so the better pick depends on which matters more to you.
Neither supplier comes out ahead on everything, so the right choice depends on what you value most. 100Green has the stronger service record: customers rated its customer service 4 out of 5 in the Which? survey, its Which? total score is 72% against 66%, and its average phone wait was 7 seconds. Its Trustpilot reviewers often praise quick, knowledgeable phone staff, although some mention higher bills and unexpected pricing.
E.ON Next may suit households who want the lower prices shown and an app that is well rated on both iPhone and Android. It also scored 9 out of 10 for help for those who need it in the Which? supplier assessment, which may matter if you need extra support. Its main drawback is service: customers rated it 2 out of 5 and phone waits were longer.
100Green may suit households who want to reach a person quickly, prefer deals without exit fees and like that it says every tariff comes with UK-generated renewable electricity. The cost of that choice is about £165 a year more on the cheapest deals shown.
- Customers rated its customer service 4 out of 5 in the Which? survey, against 2 for E.ON Next
- Average call centre wait of 7 seconds and 98.4% of emails answered within two days
- No exit fee on any of the four deals priced here, including its 12-month fixes
- 99.95% of traditional meter bills based on actual readings
- Says every tariff comes with UK-generated renewable electricity
- Cheapest deal shown costs £1,787 a year, £165 more than E.ON Next's
- Scored 4 out of 10 for help for those who need it in the Which? supplier assessment
- Scored 1 out of 5 for switching in the Which? supplier assessment
- App rated 1.2 on both the App Store (25 ratings) and Google Play (34 ratings)
- 86.05% of its smart meters working, against 94.82% at E.ON Next
- Next Pledge Tracker 12m v12 at £1,622 a year is the lowest annual estimate shown for either supplier
- App rated 4.8 on the App Store from 51,000 ratings and 4.4 on Google Play from 16,706 ratings
- Scored 9 out of 10 for help for those who need it and 8 out of 10 for smart meters in the Which? supplier assessment
- Replies to 99% of negative Trustpilot reviews, typically within 24 hours
- Customers rated its customer service 2 out of 5 in the Which? survey
- Average call centre wait of 1 minute 57 seconds, against 7 seconds at 100Green
- Exit fees of £50 on its tracker, £100 on its 12-month fix and £200 on its 24-month fix
- 93.58% of traditional meter bills based on actual readings, against 99.95% at 100Green
Use our referral link, and we'll both get £50 credit once your switch is complete.
Existing customer? Find out how you can benefit too. T&Cs apply (only one switching offer per household)
Frequently asked questions
Will I pay an exit fee if I leave early?
With 100Green, none of the four deals priced here has an exit fee, including its 12-month fixed deals. With E.ON Next, the Next Pledge Tracker 12m v12 has a £50 exit fee, Next Fixed 12m v164 has a £100 exit fee and Next Fixed 24m v80 has a £200 exit fee. Its Next Flex standard variable tariff, priced at £1,672 a year, has no exit fee.
How does E.ON Next's Next Pledge Tracker work?
It is a tracker tariff, so its rates can change during the contract rather than staying fixed. It has a 12-month term and a £50 exit fee if you leave early. At £1,622 a year, it has the lowest annual estimate among the deals priced here for either supplier.
How long will I wait to get through on the phone?
Citizens Advice figures for April to June 2026 show an average call centre wait of 7 seconds at 100Green and 1 minute 57 seconds at E.ON Next. For routine enquiries, E.ON Next's phone lines are open 9am to 5pm Monday to Thursday and 9am to 4pm on Friday.
What can I do in the E.ON Next app?
E.ON Next says its app lets you view or download your electricity and gas bills, make payments, set up a monthly Direct Debit, update your bank details and track your energy use. The app is rated 4.8 on the App Store from 51,000 ratings and 4.4 on Google Play from 16,706 ratings.
Are my bills likely to be based on real meter readings?
For smart meters, both suppliers base nearly all bills on actual readings: 99.78% for 100Green and 98.51% for E.ON Next. For traditional meters, 99.95% of 100Green's bills used actual readings against 93.58% at E.ON Next, so estimated bills are more likely with E.ON Next if you do not have a smart meter.
Which supplier scores better for help if I need extra support?
In the Which? supplier assessment, E.ON Next scored 9 out of 10 for help for those who need it, against 4 out of 10 for 100Green. This rates the supplier's support arrangements rather than guaranteeing the help any one household will get.
Where does each supplier's electricity come from?
100Green says all its tariffs come with UK-generated renewable electricity, bought from small British hydro, wind and solar generators. E.ON Next's fuel mix disclosure for 1 April 2025 to 31 March 2026, covering all the electricity it supplied, shows 27.3% renewable, 5.8% nuclear, 53.2% natural gas, 9.3% coal and 4.4% other sources.
What changed this month
This month, E.ON Next's iOS sampled neutral reviews rose from 0 to 1, E.ON Next's iOS app days since last update fell from 25 to 5, and E.ON Next's play store days since last update fell from 16 to 6. There were 18 other data changes this month — see the full changelog below for details.
Data changes this month (27)
100Green
- Trustpilot reviews1,576 → 1,594
- Trustpilot 4-star %12 → 11
- Trustpilot 1-star %7 → 8
- Trustpilot negative reviews replied %100 → 90
- Trustpilot positive reviews %86 → 85
- Trustpilot negative reviews %10 → 11
- Trustpilot net-positive %76 → 74
- iOS app ratings count24 → 25
- iOS app days since last update29 → 39
- iOS sampled reviews avg stars1 → 1.33
- Play Store days since last update31 → 41
- Cheapest fixed tariff£1,874.94 → £1,972.81
E.ON Next
- Trustpilot reviews235,587 → 243,581
- iOS app ratings count50,000 → 51,000
- iOS app days since last update25 → 5
- iOS sampled reviews avg stars1.67 → 2
- iOS sampled negative reviews3 → 2
- iOS sampled neutral reviews0 → 1
- Play Store rating4.3798914 → 4.386923
- Play Store ratings count16,579 → 16,706
- Play Store days since last update16 → 6
- Play Store positive ratings %84.1 → 84.4
- Play Store negative ratings %12.9 → 12.8
- Play Store neutral ratings %2.9 → 2.8
- Play Store net-positive %71.2 → 71.6
- Which? customer communications2 → no longer available
- Cheapest fixed tariff£1,790.52 → £1,884.25
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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.