July 29, 2022
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Every energy supplier has its own strengths, and the right one for you depends on what matters most to you. Whether that is price, customer service, green credentials, or a particular type of tariff, the guides below explain what each supplier offers, how to contact them, and what to weigh up before you switch.
Not sure who supplies your energy right now? You can check in seconds with our free find my energy supplier tool. When you are ready to compare, enter your postcode above to see the deals available in your area.
The UK's oldest and one of its largest energy suppliers, part of Centrica. Known for boiler cover, Hive smart home technology and its PeakSave off-peak rewards.
Compare supplierThe UK's largest energy supplier, known for award-winning customer service, 100% renewable electricity and a wide range of smart and EV tariffs.
Compare supplierOne of the UK's largest suppliers and its biggest generator of low-carbon electricity. Offers a broad range of tariffs plus heat pump and EV options.
Compare supplierA major UK supplier owned by Iberdrola, and the first to generate 100% renewable electricity from its own wind farms. Offers fixed, tracker and EV tariffs.
Compare supplierOne of the UK's largest suppliers, focused on smart technology and low-carbon home products such as solar, batteries and EV charging.
Compare supplierA London-based supplier offering 100% renewable electricity and a deliberately simple tariff range. Lets customers vote on their renewable energy source.
Compare supplierA supermarket energy brand supplied by E.ON Next, rewarding customers with Nectar points. Named a Which? Recommended Provider for 2026.
Compare supplierThe UK's only co-operative energy supplier, offering 100% renewable electricity with supply and service provided by Octopus Energy. No exit fees.
Compare supplierA multi-service provider that bundles energy with broadband, mobile and insurance on a single bill. Twice named Uswitch's Best Value for Money.
Compare supplierThe UK's leading specialist in prepayment, pay as you go energy, with no standing charge and strong support tools built around prepayment customers.
Compare supplierA pioneering green supplier of 100% renewable electricity and carbon-neutralised gas, reinvesting bills into new renewable generation. Exempt from the price cap.
Compare supplierA pioneering green supplier of 100% renewable electricity and carbon-neutral gas, and a certified B Corp. Now owned by Esyasoft and exempt from the price cap.
Compare supplierFormerly Green Energy UK, the only UK supplier of both 100% renewable electricity and 100% green gas. A Which? Recommended Provider, exempt from the price cap.
Compare supplierBelow is an overview of the energy suppliers currently operating in the UK. Where we have a detailed guide, you can click through to learn more about that supplier’s tariffs, contact details and customer reviews.
| Supplier | Type | Approx. domestic customers | Simply Switch guide |
|---|---|---|---|
| British Gas | Large supplier | ~8 million | View guide |
| Octopus Energy | Large supplier | ~7.5 million | View guide |
| E.ON Next | Large supplier | ~5.5 million | — |
| EDF Energy | Large supplier | ~5 million | View guide |
| OVO Energy | Large supplier | ~4 million | View guide |
| ScottishPower | Large supplier | ~2.7 million | View guide |
| Utility Warehouse | Multi-service | ~1 million | View guide |
| Utilita | Prepayment specialist | ~800,000 | View guide |
| SO Energy | Challenger | ~300,000 | View guide |
| Co-op Energy | Challenger | ~300,000 | View guide |
| E (Gas & Electricity) | Challenger | ~300,000 | — |
| Good Energy | Green specialist | ~250,000 | View guide |
| Ecotricity | Green specialist | ~200,000 | View guide |
| Outfox the Market | Challenger | ~100,000 | — |
| EBICo | Challenger | Small supplier | — |
| Sainsbury’s Energy | Supermarket brand (E.ON Next) | Not disclosed | View guide |
| 100Green | Green specialist | Small supplier | View guide |
| Fuse Energy | New supplier | New supplier | — |
| Home Energy | New supplier | New supplier | — |
| Tulo Energy | New supplier | New supplier | — |
During the energy crisis, a number of suppliers stopped trading. If it happens to your supplier, there is no need to worry, because Ofgem, the energy regulator, has a safety net in place.
Your gas and electricity supply will not be cut off. Ofgem appoints a new supplier to take on your account through a process called Supplier of Last Resort. Any credit balance you have built up is protected and transferred to your new supplier. You will be moved onto a new tariff automatically, and if you are not happy with it, you are free to switch away without paying an exit fee.
The table below shows some of the more notable suppliers that have ceased trading in recent years, and the supplier that took on their customers.
| Ceased trading | Customers moved to |
|---|---|
| Bulb Energy | Octopus Energy |
| Shell Energy | Octopus Energy |
| Avro Energy | Octopus Energy |
| SSE (retail) | OVO Energy |
| npower | E.ON Next |
| Green Network Energy | EDF Energy |
| Pure Planet | Shell Energy |
| People’s Energy | British Gas |
| Igloo Energy | E.ON Next |
| Utility Point | EDF Energy |
| GB Energy Supply | Co-op Energy |
| Spark Energy | OVO Energy |
There are two main reasons people switch energy supplier. The most common is to save money. When a fixed deal ends, you are usually moved onto your supplier’s standard variable tariff, which can cost more. If you have not switched or renewed in over a year, it is worth comparing to see whether you could pay less.
The second reason, which is growing in popularity, is sustainability. Suppliers source their energy in different ways, and while many use a mix of renewable and fossil fuels, a number now supply 100% renewable electricity. If reducing your carbon footprint matters to you, a green supplier could be worth considering.
When you compare suppliers, it helps to weigh up a few key factors rather than looking at price alone.
Price is the most important factor for many people, and there can be a meaningful difference between the cheapest and most expensive tariffs. Comparing deals in your area is the best way to see what you could pay.
Decide whether a fixed or variable tariff suits you. A fixed tariff locks in your unit rates for a set period, giving you certainty. A variable tariff can rise or fall in line with the Ofgem price cap. Some suppliers also offer specialist tariffs for electric vehicles, heat pumps or prepayment meters.
Service varies considerably between suppliers. Independent sources such as Which? and Citizens Advice, along with Trustpilot reviews, can give you a sense of how responsive and helpful a supplier is before you commit.
If sustainability is a priority, check how a supplier actually sources its energy. Some genuinely generate or buy renewable electricity and offer green gas, while others rely more heavily on certificates. The individual supplier guides above explain each one’s approach.
Check the contract length and whether any exit fees apply if you leave early. It is also worth choosing a supplier with a track record of reliable service.