100Green OVO Energy (November 2026)
Overview
OVO Energy has the cheaper variable tariff, while 100Green scores better on service and answers calls faster, so the right choice depends on which matters more to you.
Neither supplier comes out ahead overall, because each leads on something different. 100Green has the stronger service record: its Which? total score is 72 against OVO Energy's 61, and between April and June 2026 its average call centre wait was 7 seconds, compared with 47 seconds at OVO. OVO has the lower-priced variable tariff, with its Simpler Energy deal estimated at £1,672 a year. That is £115 less than 100Green's Sparkling SVT at £1,787, or about £10 a month. Trustpilot ratings are close, at 4.6 and 4.7, so the choice comes down to whether easier contact or a lower variable price matters more to you.
Other measures also split the two suppliers. OVO's app is rated 4.6 on the App Store from 18,000 ratings, while 100Green's apps have too few ratings to judge fairly. OVO also scores 9 out of 10 for help for those who need it in the Which? supplier assessment, against 4 for 100Green.
About 100Green and OVO Energy
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 OVO Energy?
OVO's story began in 2009, and it has since grown into a supplier used by over 3.6 million homes. The company that supplies those homes is OVO Energy Limited, based at Temple Back in Redcliffe, Bristol.
OVO Energy is part of the wider OVO Group. In 2014 the company set up the OVO Foundation, a charitable arm that works to tackle inequality.
OVO says its focus is on making the grid greener for everyone. It openly criticises green claims that rest only on renewable certificates, because it argues these add no new renewable power. It prefers to buy from renewable generators directly and to invest in new, independent renewable power.
Products & services
- [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] OVO Energy: began in 2009
- [7] OVO Energy: over 3.6 million homes
- [8] OVO Energy Limited
- [9] OVO Energy: Boost
- [10] OVO Energy: making the grid greener for everyone
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Tariffs and pricing
OVO Energy's lowest annual estimate is for Simpler Energy, a variable tariff at £1,672 a year. 100Green's is Sparkling SVT, also a variable tariff, at £1,787 a year. That makes OVO's variable deal £115 a year cheaper, or about £10 a month. Prices on both can change, but because neither has an exit fee, you can move to another deal without paying a charge.
The picture is reversed for fixed deals. 100Green's cheapest is Exclusive Spring 100% Green 12M November 27, a 12-month fixed tariff at £1,973 a year with no exit fee. OVO's cheapest fixed option is 1 Year Fixed + Complete Cover 29 October 2026, a 12-month deal at £2,027 a year with a £100 exit fee. So 100Green's fix costs £54 a year less, about £5 a month, and you can leave it early without a charge.
100Green's other two 12-month fixes priced here, Stream Fixed - November 27 at £2,005 a year and Sparkling Guarantee - November 27 at £2,018 a year, also have no exit fee. At OVO, the plain 1 Year Fixed 29 October 2026, without the cover, is £2,031 a year and carries the same £100 exit fee. The Complete Cover version packages that 12-month energy deal with OVO's Complete Cover. All the prices shown are for paying by monthly Direct Debit.
| Metric | 100Green | OVO Energy |
|---|---|---|
| Exit fee on cheapest tariff | £0 | £0 |
| Exit fee on cheapest fixed tariff | £0 | £100 |
100Green and OVO Energy: 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.
OVO Energy
Simpler Energy is OVO's standard variable tariff. It has no end date, so you can leave or switch plans at any time, which suits households who want flexibility and are comfortable with prices that can change. The 1 Year Fixed 29 October 2026 deal instead fixes your unit rates for 12 months, though bills still rise and fall with how much energy you use. It suits households who want steadier costs and expect to stay the full year, because leaving early carries an exit fee.
The 1 Year Fixed + Complete Cover 29 October 2026 edition has the same 12-month term but packages the energy deal with OVO's Complete Cover, for households who want energy and cover arranged together. Look at what the cover protects and how it is charged before choosing it over the plain fixed deal.
Charge Anytime is an add-on to eligible OVO electricity tariffs, not a separate tariff. OVO controls when your electric vehicle charges at home, aiming for the cheapest and greenest times, and you can choose pay as you go or a monthly plan with a home charging allowance. Standard monthly plans also include a public charging voucher, while partnership EV plans cover smart charging only. It is open only to existing OVO pay monthly customers who pay by Direct Debit and have a compatible car or charger and a smart meter that sends half-hourly readings. Homes with solar PV need a Solar Compatible Charger. Pay monthly customers can also add the paid Greener Energy upgrade for renewable backing.
Eligibility
For existing OVO pay monthly electricity or dual-fuel customers paying by Direct Debit, with an EV to charge at home. Connect through a compatible EV or charger with a working internet connection, and use a compatible electricity smart meter sharing half-hourly readings: SMETS2 meters or Secure-manufactured SMETS1 meters. Homes with solar PV need a Solar Compatible Charger.
Customer reviews
On Trustpilot the two suppliers are rated almost the same: 4.6 for 100Green from 1,594 reviews and 4.7 for OVO Energy from 309,371 reviews, so OVO's score rests on a far larger number of reviews. Five-star reviews make up 74% of 100Green's total and 78% of OVO's, while one-star reviews account for 8% and 9%. OVO replied to 99% of negative reviews, usually within 24 hours, compared with 90% at 100Green, which typically replies within 48 hours.
100Green reviewers often praise friendly, knowledgeable staff who answer the phone quickly, explain account matters clearly and sort out problems without delay. The main criticism is about cost, as some customers report higher bills or unexpected pricing issues.
OVO reviewers praise patient, helpful advisers, especially when dealing with complicated account set-ups and billing questions, and engineers who turn up on time and carry out installations efficiently. Complaints focus on long phone waits, trouble reaching a person quickly, weak email replies and automated chat that fails to fix urgent problems.
Which? combines a customer survey with its own supplier assessment to produce a total score, which is 72% for 100Green and 61% for OVO. In the customer survey, 100Green gets 4 out of 5 for overall customer service, against 2 for OVO. The supplier assessment gives 100Green 12 out of 15 for complaints performance, against 6 for OVO, while OVO scores higher on help for those who need it, with 9 out of 10 against 4, and on switching, with 2 out of 5 against 1.
Mobile apps
OVO Energy's app is widely used, with 1,000,000+ installs on Google Play. It is rated 4.6 on the App Store from 18,000 ratings and 3.0 on Google Play from 11,178 ratings, where positive and negative ratings are close to evenly split. OVO says customers can use the app to keep an eye on their balance, send meter readings, track energy use, find bills and join Power Move, which gives points for using electricity at greener times. One user found the app works well on an iPhone but has never loaded on their iPad.
100Green's apps have far fewer ratings, scoring 1.2 on the App Store from 25 ratings and 1.2 on Google Play from 34 ratings. With so few ratings, they are hard to compare fairly with OVO's tens of thousands. One iPhone user said the app shows electricity use by day, week and month, but gas use only monthly and only for the previous month, which they found frustrating with a smart meter.
Service and support
Average response: 7 sec (April to June 2026)
Average response: 47 sec (April to June 2026)
Replies: 98.4% within 2 days (April to June 2026)
Replies: 98.7% within 2 days (April to June 2026)
Average response: 51 sec (April to June 2026)
Hours: Available
Average response: 1.1 min (April to June 2026)
Citizens Advice gives 100Green 3.9 out of 5 and OVO Energy 3.65, ranking them 2nd and 6th in its table. Those overall scores are fairly close, but the contact figures for April to June 2026 show clearer differences. 100Green's average call centre wait was 7 seconds, against 47 seconds at OVO, and its average webchat response was 51 seconds, against 1 minute 7 seconds. Email results were almost identical, with 98.4% of 100Green's emails and 98.7% of OVO's answered within two days.
Meter and billing figures for the same period point in different directions. OVO had 95.08% of its smart meters working, compared with 86.05% at 100Green. However, 100Green based more of its bills on actual meter readings: 99.78% of smart-meter bills and 99.95% of traditional-meter bills, against 98.44% and 90.24% at OVO. The traditional-meter gap matters most if you do not have a smart meter, because bills that are not based on actual readings are estimated.
If you need OVO's collections team, you can phone it from 9am to 5pm, Monday to Friday, or use webchat from 8am to 6pm on weekdays and 9am to 2pm on Saturdays.
| Billing and metering | 100Green — April to June 2026 | OVO Energy — April to June 2026 |
|---|---|---|
| Smart meters working correctly | 86.05% | 95.08% |
| Bills based on readings — smart meters | 99.78% | 98.44% |
| Bills based on readings — traditional meters | 99.95% | 90.24% |
Complaints and performance: 100Green vs OVO Energy
Both suppliers' own complaint figures cover the same period, Q2 2026, so their complaint rates can be compared directly. Both Citizens Advice figures also cover the same period, April to June 2026. The two sets of figures measure different things, though, and should not be mixed up or converted into one another.
Complaints reported by the suppliers
In Q2 2026, 100Green reported 90 complaints for every 100,000 customer accounts. OVO Energy reported 1,775 complaints for every 100,000 customer accounts over the same quarter, which is nearly 20 times 100Green's rate. These figures count complaints made to the supplier, not the number of people affected. One customer can complain more than once, and one household can hold more than one account.
OVO Energy also published how quickly it dealt with complaints in Q2 2026. It resolved 63.5% by the end of the next working day and 90.7% within 8 weeks. These figures show how fast complaints were closed, not whether customers were happy with the outcome. 100Green did not supply resolution figures, so the two suppliers cannot be compared on how quickly complaints are sorted out.
Complaints to Citizens Advice and the Energy Ombudsman
Citizens Advice counts complaints that customers take to advice bodies and the Energy Ombudsman, rather than complaints made directly to the supplier. For April to June 2026, 100Green had 22.8 of these complaints per 10,000 customers and OVO Energy had 37.5. On this measure, OVO Energy's rate was higher. It uses a different denominator from the supplier-reported figures above, so the two rates cannot be compared with each other.
What customers complain about
OVO Energy listed its five main complaint reasons in ranked order. It did not give a share for each one, a period for the list or any details of what it is doing about them. These themes should not be read as covering Q2 2026. 100Green did not supply any complaint reasons, so it is not possible to compare what customers of each supplier complain about.
100Green and OVO Energy: 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.
OVO Energy
Across all its customers, the electricity OVO supplied from 1 April 2025 to 31 March 2026 came from 64% natural gas, 12% coal, 12% renewables, 7% nuclear and 5% other sources. OVO reports a carbon intensity of 393g per kWh for that mix. In other words, more than three-quarters of its overall supply that year came from gas and coal.
REGOs (Renewable Energy Guarantees of Origin) are certificates that match renewable power already being generated with the electricity a customer uses. OVO argues that, on their own, they do not make the grid any greener, and it stopped using REGOs as standard in 2023. Instead, it says it buys electricity for its Greener Electricity customers directly from renewable generators around the country and invests in new, independent renewable power.
Households who want renewable backing can add the paid Greener Energy upgrade. OVO then buys enough renewable electricity from UK-based generators to match what you use, through Power Purchase Agreements (PPAs), which are contracts to buy power directly from a generator. It buys REGOs alongside that power to show where it came from. OVO's plans page promises 100% renewable electricity on this basis. Your home still draws from the national grid's mix, but an equal amount of renewable electricity is added to the grid rather than sent straight to you.
The upgrade also makes your energy carbon neutral. For every tonne of carbon from the gas Greener Energy customers use, OVO buys one carbon offset certificate from projects certified to the Verified Carbon Standard or the Gold Standard. OVO also says the green gas it sells is backed by Renewable Gas Guarantees of Origin. If OVO supplies only your gas, the upgrade still applies to that gas.
When you add the upgrade, and on each anniversary while you keep it, OVO puts £20 towards new UK renewable generation. The money buys power at above market rates from new generators that cannot get government or industry subsidies, which can help those projects attract other funding. OVO says it may take some time to put each contribution to use.
To qualify, you need to be an OVO pay monthly customer on any plan, whether dual fuel, gas only or electricity only. You must pay by monthly Direct Debit on time, pay at least the recommended amount and get account messages by email. The upgrade carries on if you move home and stay with OVO, but it ends on the day you switch supplier, with no refund for part months.
Outside the upgrade, the OVO app lets you join Power Move and earn points for using electricity at greener times. OVO also says it has planted 5 million UK trees in schools and communities since 2015 on behalf of its customers.
Our verdict
| If you care most about | Choose |
|---|---|
| The cheaper variable tariff | OVO Energy |
| Shorter phone waits and higher service scores | 100Green |
OVO Energy has the cheaper variable tariff, while 100Green scores better on service and answers calls faster, so the right choice depends on which matters more to you.
The right choice depends on what you value most, but 100Green has the stronger service evidence. Customers give it 4 out of 5 for overall customer service in the Which? survey, its Which? total score is 72% against 61%, and its calls were answered in 7 seconds on average between April and June 2026. Trustpilot reviewers often praise its staff for quick, clear help on the phone, and it bases almost all of its bills on actual meter readings.
OVO Energy may suit households who want a widely used app, which is well rated on the App Store, and who value its higher Which? assessment score for helping customers who need extra support. If a lower variable price matters most, it is also the better pick from the deals priced here, with Simpler Energy £115 a year cheaper and no exit fee. Its main drawbacks are weaker customer survey scores and longer phone waits.
100Green is the stronger choice if you value getting through quickly and want a fixed deal you can leave without a fee, and all of its priced tariffs are green tariffs. The main drawback is that its variable tariff costs more than OVO's.
- Which? total score of 72%, compared with 61% for OVO Energy
- Average call centre wait of 7 seconds between April and June 2026, against 47 seconds at OVO
- Customers give it 4 out of 5 for overall customer service in the Which? survey
- Cheapest 12-month fix is £1,973 a year with no exit fee, £54 less than OVO's cheapest fix
- All four tariffs priced here are green tariffs
- Sparkling SVT variable tariff costs £115 a year more than OVO's Simpler Energy
- 86.05% of its smart meters were working, against 95.08% at OVO
- Scores 4 out of 10 for help for those who need it and 1 out of 5 for switching in the Which? supplier assessment
- Some Trustpilot reviewers mention higher bills and unexpected pricing issues
- Simpler Energy variable tariff is £1,672 a year with no exit fee, £115 less than 100Green's variable deal
- Trustpilot rating of 4.7 from 309,371 reviews
- Rated 4.6 on the App Store from 18,000 ratings
- Scores 9 out of 10 for help for those who need it in the Which? supplier assessment
- 95.08% of its smart meters were working between April and June 2026
- Customers give it 2 out of 5 for overall customer service in the Which? survey
- Average call centre wait of 47 seconds, and some Trustpilot reviewers mention long phone waits
- Both 12-month fixes priced here carry a £100 exit fee
- 90.24% of traditional-meter bills were 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
Which supplier has the cheaper variable tariff?
Among the deals priced here, OVO Energy's Simpler Energy is £1,672 a year and 100Green's Sparkling SVT is £1,787 a year. That makes OVO's £115 a year cheaper, or about £10 a month. Neither has an exit fee, and prices on both can change.
Do the 12-month fixed deals have exit fees?
100Green's three 12-month fixes priced here have no exit fee, including the cheapest, Exclusive Spring 100% Green 12M November 27 at £1,973 a year. OVO Energy's two 12-month fixes each carry a £100 exit fee: 1 Year Fixed + Complete Cover 29 October 2026 at £2,027 a year and 1 Year Fixed 29 October 2026 at £2,031 a year.
How long will I wait to get through on the phone?
Between April and June 2026, the average call centre wait was 7 seconds at 100Green and 47 seconds at OVO Energy. Webchat replies averaged 51 seconds at 100Green and 1 minute 7 seconds at OVO. Some OVO Trustpilot reviewers mention long phone waits and difficulty reaching a person.
What can I do in the OVO app?
OVO says its app lets you keep an eye on your balance, send meter readings, track your energy use, find your bills and join Power Move, which gives points for using electricity at greener times. It is rated 4.6 on the App Store from 18,000 ratings and 3.0 on Google Play from 11,178 ratings.
How is the 100Green app rated?
It is rated 1.2 on the App Store from 25 ratings and 1.2 on Google Play from 34 ratings. With so few ratings, the scores are hard to compare with OVO Energy's. One iPhone user said gas use is only shown monthly, and only for the previous month, while electricity use is shown by day, week and month.
Which supplier scores better for helping customers who need extra support?
In the Which? supplier assessment, OVO Energy scores 9 out of 10 for help for those who need it, while 100Green scores 4. This reflects Which?'s assessment of each company's approach. Trustpilot reviewers of both suppliers praise patient, helpful staff.
Will my bills be based on actual meter readings?
Between April and June 2026, 100Green based 99.78% of smart-meter bills and 99.95% of traditional-meter bills on actual readings. At OVO Energy the figures were 98.44% and 90.24%. OVO had more of its smart meters working, at 95.08% against 86.05%.
What do customers complain about most?
On Trustpilot, 100Green reviewers mostly praise its staff, though some raise higher bills and unexpected pricing issues. OVO Energy reviewers mention long phone waits, trouble reaching a person, weak email replies and automated chat that fails to sort out urgent problems.
What changed this month
This month, OVO Energy's play store net-positive % rose from -4.1 to 2.8, OVO Energy's iOS sampled positive reviews rose from 0 to 2, and OVO Energy's iOS sampled negative reviews rose from 0 to 1. There were 18 other data changes this month — see the full changelog below for details.
Data changes this month (26)
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
OVO Energy
- Trustpilot reviews304,542 → 309,371
- iOS app days since last update29 → 17
- iOS app updates in last 90 days2 → 3
- iOS sampled reviews avg starsnow available (3.67)
- iOS sampled positive reviews0 → 2
- iOS sampled negative reviews0 → 1
- Play Store rating2.9077778 → 3.045154
- Play Store ratings count11,054 → 11,178
- Play Store days since last update29 → 18
- Play Store positive ratings %46 → 49.6
- Play Store negative ratings %50.1 → 46.8
- Play Store neutral ratings %3.9 → 3.6
- Play Store net-positive %-4.1 → 2.8
- Cheapest fixed tariff£1,968.62 → £2,027.01
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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.