What is Octopus Energy?

Octopus Energy is a UK gas and electricity supplier. It launched in 2016 and now serves millions of homes across Britain. You still get energy through the same local pipes, wires and meters; Octopus is the company that bills you, manages your tariff and handles your account.

Reviewed 26 May 2026: Octopus says it has passed 8 million UK home energy customers and remains the UK’s largest energy supplier. Its homepage still leads with value, green technology, customer-service recognition and smart tariffs. Treat those as useful confidence signals, not a reason to switch before checking your meter, tariff and home setup.

The short version

Octopus is best known for three things:

• A modern account platform: its Kraken system runs billing, meter data, tariff changes and app features.
• Smart tariffs: Agile, Tracker, Go, Intelligent Octopus Go, Cosy and export tariffs give more choice than a simple standard tariff.
• Customer-service and support signals: Octopus points to Which? Recommended Provider recognition, Trustpilot ratings and support schemes such as Octo Assist and You Pay We Pay.

That does not mean it is automatically the cheapest supplier for everyone. Your region, meter, usage pattern, current fixed deal, EV, heat pump, solar setup and appetite for time-of-use pricing all matter.

Current source check, 26 May 2026

The current source check for this overview used Octopus’s 24 April 2026 customer milestone press release, the live Octopus homepage, the smart-tariff hub, Octopus Go and Octopus smart-tariff terms. The practical points are:

• Octopus says it has passed 8 million UK home energy customers. That makes it a mainstream supplier, not a niche experiment.
• Octopus says more than a million customers have tried a smart tariff or smart service, but the smart-tariff terms still depend on a compatible smart meter, half-hourly readings and, for some tariffs, compatible cars, chargers, batteries or heat-pump controls.
• Octopus Go is still framed around a fixed 00:30 to 05:30 whole-home off-peak window for EV households, while Intelligent Octopus Go adds smart scheduling for compatible EVs or chargers.
• Octopus’s smart-tariff terms say third-party app or device data cannot replace Octopus meter data for billing, so app screenshots are evidence, not the final account record.
• The useful decision is not “is Octopus big?“. It is whether the tariff, meter and home-technology conditions fit your own use.

What changes if you switch?

For a normal household switch, the physical supply does not change. No one usually needs to replace your cables, gas pipe, boiler or consumer unit just because you choose Octopus.

The account changes instead. Octopus becomes responsible for your bills, tariff, meter readings, Direct Debit and customer support. Your old supplier sends a final bill and closes the old account.

If you are new to switching, start with how switching works before choosing a tariff.

Why Octopus is different from a traditional supplier

Most suppliers can sell fixed or variable energy tariffs. Octopus also puts a lot of emphasis on tariffs that respond to time, demand, smart meters or low-carbon technology.

That includes:

• Flexible Octopus for a simpler standard variable tariff
• Octopus Tracker for a daily wholesale-linked price
• Agile Octopus for half-hourly electricity prices
• Octopus Go and Intelligent Octopus Go for EV households that can charge at home, with Go using a fixed overnight whole-home window and Intelligent Go adding smart scheduling for compatible EVs or chargers
• Cosy Octopus for some heat-pump homes that can shift heat and hot-water demand into cheaper windows
• Outgoing Octopus for exporting solar electricity

Some older or specialist tariffs may be closed to new customers. Flux, for example, is now mainly a legacy reference for people who already have it. Always check the current tariff page before making a decision.

When Octopus may be a good fit

Octopus is worth a close look if:

• you want a supplier with a strong app and clear online account tools
• you have an EV and can charge at home
• you have solar panels, a battery or plan to export electricity
• you have a heat pump and can shift some use away from peak times
• you want to compare fixed, flexible, Tracker and smart tariffs in one place
• you want to compare account tools, support signals and tariff options before choosing a supplier

A smart meter helps unlock the more interesting tariffs. Without one, you can still switch to Octopus, but some of the biggest savings routes may not be available. For smart import tariffs, Octopus’s terms rely on compatible smart-meter data and half-hourly readings; third-party charger, vehicle, inverter or app data can help explain what happened, but it is not the final billing record.

When to be cautious

Do not switch just because Octopus is large or popular. Check the practical details first:

• whether your current tariff has exit fees
• whether your household can actually shift use into cheaper periods
• whether your EV or charger is compatible with Intelligent Octopus Go
• whether you are comfortable with prices that can change daily or half-hourly
• whether a simple fix from another supplier is better for your risk tolerance
• whether your smart meter is already sending reliable readings

If your current fix is very cheap, or you cannot use smart-tariff windows, switching may be less urgent than the marketing makes it sound.

What about the referral code?

The referral code is useful only after the tariff choice makes sense. It should not be the reason to pick Octopus.

If you decide Octopus fits your home, you can use Matt’s Octopus referral code during signup. The site explains how the account credit works, but the tariff and meter checks should come first.

Next steps

If you are still deciding, these pages are the most useful places to go next:

• Choose the right Octopus tariff
• Compare live Octopus tariff rates
• Read the independent Octopus review
• How to switch to Octopus