Octopus Energy is the UK's largest household energy supplier, known for its customer service, technology-led approach and wide range of smart tariffs. It launched in 2015 and overtook British Gas to become Britain's biggest home energy supplier in 2024, and it now supplies around a quarter of UK homes.
All Octopus tariffs come with 100% renewable electricity, and it offers some of the most innovative deals on the market, from tariffs that track wholesale prices to specialist options for electric vehicles, heat pumps, solar panels and home batteries.
Octopus is a Which? Recommended Provider for the ninth year running, and scores 4.8 on Trustpilot from over 800,000 reviews. It has one of the widest ranges of smart and green tariffs in the UK, but it is still worth comparing prices for your home before you switch.
| Company detail | Octopus Energy |
|---|---|
| Founded | 2015 |
| Chief executive | Greg Jackson |
| Owner | Octopus Energy Group, backed by Octopus Group and investors including Origin Energy and Tokyo Gas |
| Market share | Around 26% of UK electricity and gas customers (March 2026), the largest of any supplier |
| Electricity | 100% renewable on all tariffs |
| Tariffs offered | Variable, fixed, tracker, EV, heat pump, solar and battery, export and prepayment |
| Exit fees | None on variable, £50 per fuel on some fixed tariffs |
| Trustpilot rating | 4.8 out of 5 from around 830,000 reviews |
| Which? | 74%, Recommended Provider and Eco Provider for 2026 |
| Citizens Advice rating | 3.67 out of 5, ranked 5th (April to June 2026) |
| Phone | 0808 164 1088 |
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Octopus Energy has a range of tariffs for a wide variety of customers, including those with electric vehicles, solar panels and heat pumps. Below is a live list of the cheapest Octopus Energy tariffs available on the market today.
| Tariff Name | Electricity Unit Price | Electricity Standing Charge | Gas Unit Price | Gas Standing Charge |
|---|
For comparison purposes, energy prices shown above are based on average usage figures only. Prices may vary depending on the region you live in and your own gas and electricity usage. To see the best energy deals for where you are, run a gas and electric comparison today.
Octopus is best known for its smart tariffs. Here are the main ones.
| Tariff | What it offers |
|---|---|
| Flexible Octopus | Octopus's standard variable tariff. Prices move with the Ofgem price cap, with no end date and no exit fees. |
| Octopus Fixed | Unit rates locked for the length of the deal, usually 12 months. Exit fees may apply if you leave early. |
| Octopus Tracker | Prices change daily in line with wholesale energy costs, with a cap on how high they can go. |
| Agile Octopus | Electricity prices change every half-hour based on wholesale prices, so you can save by shifting usage to cheaper times. Needs a smart meter. |
| Octopus Go and Intelligent Octopus Go | EV tariffs with cheap overnight electricity for charging. Intelligent Octopus Go works with compatible cars and chargers. See our EV tariffs guide. |
| Cosy Octopus | A time-of-use tariff for homes with a heat pump, with cheaper periods through the day. |
| Octopus Flux and Outgoing Octopus | Tariffs for homes with solar panels and batteries, paying you for the electricity you export to the grid. |
Tariff names correct as of September 2026. Most smart tariffs need a working smart meter.
Octopus's contact page lists several ways to get in touch. The most important details are below.
| Contact method | Details |
|---|---|
| Phone, home customers | 0808 164 1088 9am to 5pm, Monday to Thursday 9am to 4pm, Friday |
| Phone, business customers | 020 3389 5613 |
| Email, home customers | hello@octopus.energy |
| Email, business customers | business@octopus.energy |
| Complaints | issueresolution@octopus.energy |
In an emergency, such as a power cut, call 105. If you smell gas, call the National Gas Emergency Service on 0800 111 999, which is free and open 24 hours a day.
Octopus Energy scores 4.8 out of 5 on Trustpilot from around 830,000 reviews, with around 90% of reviewers giving it five stars. It also won three awards at the 2026 Uswitch Energy Awards.
Octopus is a Which? Recommended Provider for the ninth year in a row, and a Which? Eco Provider for 2026. In the Which? survey from September and October 2025, it scored 74% overall, and it received full marks for the help it gives customers who need extra support.
| Which? category | Rating |
|---|---|
| Customer service overall | 4 out of 5 |
| Ease of contacting | 4 out of 5 |
| Clarity of statements | 4 out of 5 |
| Value for money | 3 out of 5 |
| Accuracy of payments | 3 out of 5 |
Citizens Advice gave Octopus a customer service rating of 3.67 out of 5 for April to June 2026, placing it 5th among suppliers. It scored full marks for customer commitments, and its average call waiting time was 1 minute 9 seconds.
Octopus Energy was set up in 2015 by Octopus Group, the investment company behind it, and is led by chief executive Greg Jackson. It is part of Octopus Energy Group, which also counts Origin Energy, Generation Investment Management, Tokyo Gas and the Canada Pension Plan Investment Board among its investors.
Octopus has grown quickly, partly through taking on other suppliers' customers. It took on around 1.5 million Bulb customers in 2022 and bought Shell Energy's UK home energy business in 2023. It also supplies customers of Co-op Energy, which it has run on behalf of the Midcounties Co-operative since 2019.
Much of this was made possible by Kraken, the customer and billing platform Octopus built in-house, which is now used by energy companies around the world. In December 2025, Octopus announced plans to spin Kraken off as a separate company.
Octopus also invests in renewable generation through Octopus Energy Generation, which runs solar farms, wind farms and other projects across the UK and Europe.
All Octopus Energy tariffs come with 100% renewable electricity. Here is Octopus Energy's fuel mix compared to the national average.
| Supplier | Coal | Gas | Nuclear | Renewable | Other | CO2 (g/kWh) | Nuclear Waste (g/kWh) |
|---|
Octopus is one of the strongest all-round suppliers in the UK. It has excellent Trustpilot and Which? scores, 100% renewable electricity, and one of the best ranges of smart tariffs for EVs, heat pumps, solar panels and batteries.
Its prices aren't always the cheapest for every home, though, and some fixed tariffs carry exit fees. Tariffs like Agile Octopus can save you money, but only if you can shift your usage to cheaper times.
As always, compare prices using your own postcode and usage before switching.
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Yes. Octopus overtook British Gas to become the UK's largest household energy supplier in 2024, and it now supplies around a quarter of UK homes.
Its Flexible Octopus variable tariff has no exit fees. Some fixed tariffs carry an exit fee of £50 per fuel, although you can switch penalty-free in the final 49 days of any fixed deal.
Agile Octopus is a tariff where electricity prices change every half-hour in line with wholesale prices. Prices are often cheapest overnight and sometimes during the day when there's lots of wind and sun, and can occasionally go negative. It needs a smart meter.
Yes. Octopus has been a Which? Recommended Provider for nine years in a row, and it is also a Which? Eco Provider for 2026.
Yes. All Octopus Energy tariffs come with 100% renewable electricity.
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Last updated: 29 September 2026. Which? figures are from its September to November 2025 assessment. Citizens Advice figures cover April to June 2026. Trustpilot rating correct as of July 2026. Tariff availability and pricing change frequently, so always confirm current rates through a comparison using your own postcode and consumption.
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