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- Renewable electricity as standard
- Supplies some carbon-offset gas
- Invests in renewable energy generation
- Not the quickest at resolving complaints
Octopus Energy launched just 10 years ago but has grown rapidly to become the UK’s largest home energy supplier, serving around a quarter of households.
It overtook British Gas as Great Britain’s largest electricity supplier in 2023. While it’s still the second largest for gas supply its market share continues to grow, putting it on track to overtake British Gas in the near future. By January 2025 it was powering 7.3 million homes.
It isn’t just its growth that’s impressive; its green credentials are too. Octopus Energy Generation claims to be one of Europe’s largest investors in renewable energy and some of its gas is carbon offset as well.
Octopus swept the board in our Expert Reviews Energy Awards 2025, scooping gongs for the best energy supplier overall, Best for Complaint Handling, Most Recommended, Best for Customer Trust and Best App.
In our survey of more than 2,000 people about their energy suppliers, 91% of its customers said they were either extremely likely or likely to recommend it to others.
To find out how to get the best energy deal for you, visit our guide to the best energy suppliers.
What kind of tariffs does Octopus Energy offer?
All the electricity Octopus supplies is matched by electricity generated from renewable sources. It offers a wide range of fixed and variable tariffs, including one that tracks wholesale energy prices to update your rates daily. It also has a number of EV tariffs that give you cheaper electricity at night.
If you generate your own electricity, such as using solar panels, Octopus offers a range of tariffs that pay you for any unused energy you export to the grid. There are different options depending on whether you have a home battery and if you want a combined import and export tariff.
Does Octopus Energy offer good value for money?
In our survey, Octopus was the second-highest rated for value for money with 73% of its customers saying they were very satisfied or satisfied with the value it offers. This put it just behind the winner Utility Warehouse, which had 74% of its customers saying they were very satisfied or satisfied.
Octopus was by far the most trusted supplier we rated, with 30% of customers saying they completely trust it to act in their best interests and just 7% saying they trust it only slightly or not at all.
How good is Octopus Energy at handling complaints?
Octopus Energy’s customers are highly satisfied with how well it handles complaints. An impressive 85% said they were very satisfied or satisfied with this in our survey, compared with the second-highest but significantly lower percentage of 69% for Utility Warehouse. Only 5% said they were dissatisfied or very dissatisfied.
According to the complaints data published by the energy regulator Ofgem for the second quarter of 2025, Octopus Energy had the lowest number of complaints per 100,000 customer accounts of all the suppliers in our survey at 561.
It didn’t resolve them as quickly as some of the other suppliers in our survey though. Some 51% of complaints were resolved by the end of the next working day and 79% within eight weeks. Utility Warehouse was the quickest at resolving complaints with an 83% next-day resolution rate and 100% resolved within eight weeks.
Ofgem complaints data
| Complaints per 100,000 customer accounts | Industry average complaints per 100,000 customer accounts | Complaints resolved by end of next working day | Complaints resolved within eight weeks |
| 561 | 1,052 | 51% | 79% |
Notes: Data is for the second quarter of 2025.
How clear are Octopus Energy’s bills?
Octopus was the second best for the clarity of its bills. Here, 30% said they strongly agree that their bills are clear and easy to understand compared with the best – Utility Warehouse with 40%. Only 6% of Octopus customers said they disagree or strongly disagree that their bills are clear and easy to understand compared with 13% for the worst for this – EDF Energy and Ovo Energy.
READ NEXT: How to switch energy supplier
How easy to use are Octopus Energy’s website and app?
Octopus came second for its website after Utility Warehouse and joint first for its app with Utility Warehouse. In our survey, 45% of Octopus customers said its website is very easy to use compared with 49% for Utility Warehouse. For their apps, both providers had around half of their customers saying they were very easy to use.
Along with customer satisfaction and complaints, the cost of energy suppliers’ tariffs will also determine whether they’re worth switching to. There are currently very few deals that are likely to save you money compared to your suppliers’ standard variable tariffs, which are subject to the price cap set by Ofgem, and many of the best deals on offer right now are for existing customers only.
To compare costs, you should see what your current suppliers are offering existing customers as well as gathering quotes to find out how much tariffs from different suppliers will cost you based on your energy usage. For more on how to get the best deal, visit our guide to the best energy suppliers.
Should I choose Octopus Energy?
You can be sure of getting a great service from Octopus Energy and it’s excellent if you want to reduce your carbon footprint and support the generation of renewable energy. It offers good value for money and resolves complaints well, with very low numbers of customers feeling the need to complain.
Octopus’s bills are clear and its website and app are easy to use. It also offers a wide range of tariffs, including ones that help EV owners and those generating their own electricity to save money.
