Octopus Energy Fuse Energy (August 2026)
Overview
Octopus Energy is a stronger fit for households prioritising independently measured service, while Fuse Energy currently offers the cheaper fixed tariff.
Octopus Energy leads this comparison based on available evidence, supported by established independent service scores and a highly rated app. While Fuse Energy currently provides a cheaper fixed tariff, it does not yet hold the Citizens Advice and Which? ratings seen with Octopus Energy.
About Octopus Energy and Fuse Energy
Who are Octopus Energy?
Octopus Energy started in 2015 and is backed by investors such as Generation Investment Management and Origin Energy. Through its own growth and buying other suppliers, it is now the UK's largest domestic energy supplier. It runs its billing and customer service on its own technology platform, Kraken, which it also sells to other energy companies.
Who are Fuse Energy?
Fuse Energy is one of the UK's newer domestic energy suppliers, set up in 2023 by former staff from the financial app Revolut. Backed by venture capital investors, it has grown quickly to supply hundreds of thousands of homes. The company aims to build and run its own renewable energy projects and sell the power directly to households through a digital-first, app-based service.
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Tariffs and pricing
Fuse Energy currently offers the cheapest overall tariff in this comparison. Its July 2026 Fixed (15m) V17 deal costs £1,683 a year. In contrast, Octopus Energy's cheapest option is its variable Flexible Octopus tariff, priced at £1,792 a year.
For households seeking a standard variable tariff, Octopus Energy is the cheaper option at £1,792 a year, compared to £1,805 a year from Fuse Energy. Alternatively, for those who prefer to lock in their unit rates, Fuse Energy's cheapest fixed deal costs £1,683 a year, whereas Octopus Energy's cheapest 12-month fixed deal is £1,841 a year.
Looking at contract conditions, Fuse Energy's cheapest overall tariff carries a 15-month term and a £100 exit fee. Octopus Energy's cheapest overall tariff has no fixed term and a £0 exit fee; however, its cheapest fixed deal requires a 12-month term and also includes a £100 exit fee.
Tariff Options
Octopus Energy
Octopus Energy offers a standard variable tariff and fixed deals with terms of 12 months. It also provides a wide range of smart and specialist tariffs for electric vehicle owners, homes with heat pumps, and households with solar panels and battery storage.
Fuse Energy
Fuse Energy offers a standard variable tariff and fixed deals with terms from 13 to 15 months. It also provides specialist multi-rate options and export tariffs for homes with smart technology.
Customer reviews
Both suppliers hold a 4.8 out of 5 rating on Trustpilot. Octopus Energy's score is drawn from a large volume of 837,814 reviews, compared to 8,823 reviews for Fuse Energy. Breaking down these scores, Octopus Energy sees 90% of its reviewers award five stars, while Fuse Energy achieves a 91% five-star share.
Feedback from Octopus Energy customers frequently highlights helpful staff and quick response times, with mentions that the app and website make account management straightforward. Conversely, some users report that email replies can take a few days. Fuse Energy customers note effective problem resolution and friendly support, although a few mention occasional delays when trying to reach a human agent through the chat function.
In the annual Which? survey, Octopus Energy scores 74 overall. This includes 4 out of 5 for customer service, 8 out of 15 for complaints, and 10 out of 10 for help for those who need it. Fuse Energy is not currently rated by Which?.
App quality and features
Both suppliers score 4.8 out of 5 on the App Store. Octopus Energy has accumulated 249,000 ratings on this platform, while Fuse Energy has 624 ratings. On Google Play, Fuse Energy scores 4.8 out of 5 from 706 ratings, whereas Octopus Energy scores 4.4 out of 5 from 47,091 ratings.
Fuse Energy holds a higher net-positive share on Google Play at 95.7%, compared to 74.5% for Octopus Energy. In terms of user base, Octopus Energy has over 1,000,000 Android installs, while Fuse Energy has over 100,000. Both suppliers have updated their apps recently.
A small sample of recent Octopus Energy iOS reviews indicates some frustration with smart meter data gaps and sudden billing changes, alongside positive remarks regarding easy setup. Recent iOS reviews for Fuse Energy mention helpful chat agents and customer support, though one user noted that the wider company service could improve.
Service and support
Octopus Energy scores 3.67 out of 5 in the Citizens Advice ratings, ranking 4th overall. Fuse Energy does not currently hold a Citizens Advice score.
For communication speeds, Octopus Energy answers calls in an average of 1 minute 17 seconds and responds to 86.1% of emails within two days. Equivalent figures are not currently available for Fuse Energy.
Octopus Energy has formal vulnerability commitments registered with Citizens Advice. It accepts payments via Direct Debit, Cash/Cheque, and Prepayment. Its phone lines operate Monday to Thursday from 9am to 5pm, and Friday from 9am to 4pm.
Complaints and Performance
We can only look at complaints data for Octopus Energy, as there are no figures available for Fuse Energy. The data for Octopus Energy covers the fourth quarter of 2025.
Green Energy Comparison
Octopus Energy
Octopus Energy supplies 100% zero-carbon electricity as standard. Based on Citizens Advice data, the electricity it supplies to customers is a mostly renewable mix, with some nuclear power. The company invests in green technology, including heat pump installations and electric vehicle charging networks. It also runs a Fan Club scheme, which gives cheaper electricity to communities living near its wind turbines when the wind blows.
Fuse Energy
Fuse Energy takes a different approach to green energy and explicitly states that it does not claim to supply 100% renewable electricity, arguing that buying certificates to cover fossil fuel grid usage is misleading. Instead, the electricity it supplies relies heavily on the standard grid mix. The company reinvests its profits into building new solar and wind farms in the UK to help build a smarter energy grid. It also encourages customers to use energy when it is greener by offering off-peak charging windows.
Our verdict
| If you care most about | Choose |
|---|---|
| The lowest annual cost on our assumptions | Fuse Energy |
| A well-rated mobile app | Either |
Octopus Energy is a stronger fit for households prioritising independently measured service, while Fuse Energy currently offers the cheaper fixed tariff.
Octopus Energy is the UK's largest domestic energy supplier and demonstrates an established customer service record, backed by Citizens Advice and Which? scores. It also provides a cheaper standard variable tariff in this comparison.
Fuse Energy is a newer supplier that competes on price, offering a cheaper fixed tariff in this comparison, alongside high app store ratings. However, it currently lacks the independent service data that Octopus Energy holds.
Fuse Energy may suit households looking for a cheaper fixed deal, based on current pricing data. Alternatively, Octopus Energy may be more appropriate for those who prefer a supplier with an established track record of independent customer service scores.
- Cheaper standard variable tariff
- Established independent service ratings
- Answers calls in an average of 1 minute 17 seconds
- More expensive fixed tariff in this comparison
- Lower Google Play rating
- Cheaper fixed tariff in this comparison
- High Google Play rating
- Positive Trustpilot sentiment
- More expensive standard variable tariff
- Lacks Citizens Advice and Which? ratings
- Lower review volumes
Frequently asked questions
Which supplier is better overall, Octopus Energy or Fuse Energy?
Octopus Energy wins overall because it has strong, established customer service ratings from Citizens Advice and Which?, alongside a highly rated app. Fuse Energy performs well on app store ratings and offers a cheaper fixed tariff, but it lacks the independent service data that Octopus Energy holds.
Which supplier has the cheaper fixed deal?
Fuse Energy currently offers the cheaper fixed deal. Its 15-month fixed tariff costs £1,683 a year, while Octopus Energy's cheapest 12-month fixed deal costs £1,841 a year.
Do customers rate Octopus Energy or Fuse Energy higher on Trustpilot?
Both suppliers achieve a 4.8 out of 5 rating on Trustpilot. Octopus Energy's score is based on over 837,000 reviews, while Fuse Energy's score is based on just over 8,800 reviews.
Which supplier has the better mobile app?
Both suppliers score 4.8 out of 5 on the App Store. On Google Play, Fuse Energy scores 4.8 out of 5, while Octopus Energy scores 4.4 out of 5. Octopus Energy has significantly more ratings across both platforms.
How quickly does Octopus Energy answer the phone?
According to Citizens Advice data, Octopus Energy answers calls in an average of 1 minute 17 seconds. This data is not currently available for Fuse Energy.
Should I choose Octopus Energy or Fuse Energy?
If you want a cheaper fixed tariff or highly rated Android app, Fuse Energy is a strong option. If you prefer a supplier with a proven customer service record, a cheaper variable tariff, and fast call answer times, Octopus Energy is the better choice.
Does either supplier charge an exit fee?
Yes. Both suppliers charge a £100 exit fee on their cheapest fixed tariffs. Octopus Energy's standard variable tariff has no fixed term and a £0 exit fee.
Why does Fuse Energy not have a Citizens Advice score?
Fuse Energy does not currently have a Citizens Advice score or rank in the data used for this comparison.
Which supplier has the cheaper standard variable tariff?
Octopus Energy offers the cheaper standard variable tariff, costing £1,792 a year compared to Fuse Energy's £1,805 a year.
What changed this month
This month, Octopus Energy's iOS sampled positive reviews rose from 0 to 1, Octopus Energy's iOS sampled negative reviews rose from 0 to 2, and Octopus Energy's cheapest tariff exit fee fell from £100 to £0. There were 30 other data changes this month — see the full changelog below for details.
Data changes this month (38)
Octopus Energy
- Trustpilot reviews821,111 → 837,814
- iOS app ratings count245,000 → 249,000
- iOS app days since last update9 → 6
- iOS sampled reviews avg starsnow available (2)
- iOS sampled positive reviews0 → 1
- iOS sampled negative reviews0 → 2
- Play Store rating4.4341745 → 4.3956046
- Play Store ratings count46,873 → 47,091
- Play Store days since last update11 → 2
- Play Store positive ratings %86.7 → 85.5
- Play Store negative ratings %10 → 11
- Play Store neutral ratings %3.3 → 3.5
- Play Store net-positive %76.7 → 74.5
- Cheapest fixed tariff£1,697.05 → £1,841.19
- Cheapest tariff£1,697.05 → £1,792.32
- Cheapest tariff exit fee£100 → £0
- Cheapest tariff term12 months → 0 months
- Tariff count2 → 3
- Fixed tariffs available1 → 2
Fuse Energy
- Trustpilot reviews7,274 → 8,823
- Trustpilot 5-star %90 → 91
- Trustpilot 1-star %5 → 4
- Trustpilot negative reviews replied %76 → 83
- Trustpilot positive reviews %93 → 94
- Trustpilot negative reviews %6 → 5
- Trustpilot net-positive %87 → 89
- iOS app rating4.7 → 4.8
- iOS app ratings count548 → 624
- iOS app days since last update9 → 3
- Play Store rating4.7884617 → 4.8446603
- Play Store ratings count617 → 706
- Play Store days since last update9 → 3
- Play Store positive ratings %93.6 → 97.4
- Play Store negative ratings %4.6 → 1.7
- Play Store neutral ratings %1.8 → 0.9
- Play Store net-positive %89 → 95.7
- Cheapest fixed tariff£1,563.27 → £1,682.98
- Cheapest tariff£1,563.27 → £1,682.98
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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.