Affect Energy was bought by Octopus Energy in 2018. The supplier continues to operate and sell energy tariffs under the Affect Energy brand name.

Avro Energy aims to cut the fancy phrases and offer a cheap and simple service. Its prices consistently rank as some of the cheapest on the market and it receives sold reviews online. It could be the small-time, no-nonsense energy supplier you’re looking for.

Boost Energy is one of the only suppliers in the UK that only sells pay-as-you-go tariffs. Started in 2017 as part of the OVO Energy family, it offers traditional prepayment tariffs as well as smart meter prepayment plans that you can top up online, by text, in a PayPoint store or via the handy mobile app. Read on for more details and reviews of the provider.

Providing gas and electricity to about 12 million households in the United Kingdom, British Gas is unquestionably the nation’s largest energy provider. Here we take a look at what British Gas has to offer in the increasingly competitive world of supplying energy.

Bulb Energy is a startup based in London and aims to provide green energy without the premiums. A full 100% of its electricity and 10% of its gas come from independent green energy generators in the UK. The company has grown dramatically in recent years and currently supplies over 850,000 homes in the UK. If you’re looking for an ethical company that values customer service, transparent tariffs and which is concerned about the environment, then Bulb Energy might be a good choice.

Coop Energy claims to be a different type of electricity and gas supplier. Unlike other UK energy companies, Coop (also known as Cooperative Energy) is part of a larger Cooperative, meaning the company is owned by coop members, rather than large foreign corporations like most Big Six companies.

Looking for a simple gas tariff? Daligas - one of the UK’s gas only energy suppliers - offers two straightforward gas tariffs, one for domestic customers and one for business customers. Read on for customer reviews, login details, tariff information and more to see if it’s the right gas supplier for you.

E Energy was founded in 2014 by former Economy Energy co-owner Paul Cooke. The Birmingham-based provider offers a 'no-nonsense' approach to prepayment gas and electricity with a focus on keeping costs down.

Ecotricity is the world’s first green energy company. Founded in 1996 with just a single windmill, it now supplies green gas and electricity to around 200,000 homes in the UK. What’s it offering on the market that makes Ecotricity so popular? Find out what that is and how they offer 100% green energy.

Providing gas and electricity to about 4.9 million residential customers in the UK, EDF Energy is currently the UK’s fourth-biggest energy supplier with 9.6% market share and the largest provider by volume in the nation. However, today’s energy market is increasingly competitive, so what does EDF Energy have to offer the informed consumer? Read on for all the essential information about this Big Six supplier.

Although belonging to a Europe-wide energy group, Enstroga operates as a small, independent energy provider in the UK. The provider claims to provide affordable energy with transparent, high-quality customer service. Find out more in this provider summary.

German-owned EON is one of the Big Six gas and electricity suppliers to households and businesses across the UK and abroad. They're the most significant investor-owned energy company in the world. Find out what they have to offer you and whether it's worth switching to them.

Good Energy has a history of pioneering green-first approaches to energy sourcing and supply, being the first to provide 100% renewable energy. Find out more about the supplier, its latest prices and tariffs, account management services, and reviews, all here in this guide.

Green Energy UK is the first energy provider to supply renewable electricity and green gas. Find out more about where it gets its fuel from, how to contact the supplier and read Green Energy UK reviews.

Igloo Energy is an energy company from Southampton which has been designed for digital natives and which works in harmony with your phone to make managing your energy easier.

M&S Energy partners with Octopus Energy through what's called a 'white-label' agreement to provide gas and electricity to domestic customers. The company claims to offer ‘feel-great energy’ that is affordable and 100% renewable.

With a wide range of tariffs, competitive prices, 100% renewable electricity, and award-winning customer service, is Octopus Energy worth switching to?

Since its launch in 2017, Outfox the Market has promised to help customers save money on their energy bills while reducing their carbon footprint. Is it worth signing up with them? Read on and you’ll be able to decide for yourself.

Launched in 2009 and with a focus on clean energy, Bristol-based Ovo Energy is the UK’s biggest independent energy supplier. After acquiring Economy Energy and SSE’s home energy business in 2019, Ovo has become the second-largest energy provider in the UK, just behind British Gas. Read on to find out what Ovo Energy can offer you.

Want an energy supplier that puts people and the planet first? What about one that plans to return 75% of its profit back to its members? People’s Energy could be just what you are looking for! Read on to find out more about the people-powered supplier, including customer reviews, tariff information and more.

Preston based energy supplier PFP Energy focuses on keeping its bills and tariffs simple for its customers. Offering a fixed-rate, variable-rate and prepayment tariff, as well a variety of business energy tariffs, it’s suitable for a wide range of customers.

Pure Planet Energy is a new energy company created by the team who founded Virgin Mobile. An ethical energy company which uses 100% renewable energy and 100% carbon offset gas, it is the first digital-only energy supplier in the UK. With one tariff and affordable prices, it has a 0% markup on wholesale energy prices.

Sainsbury's Energy is a partnership between Sainsbury's and E.ON next. Find out if it's worth picking up some energy as well as your weekly shop from this supplier.

Scottish Power has been around for decades and is one of the most established energy providers in the UK. With a wide range of tariffs, an extensive amount of extra services and energy grants to help customers who struggle to pay their bills, the energy giant goes far beyond just offering energy deals

Shell Energy is a big brand that’s fairly new on the UK energy scene. Taking over First Utility in 2018 and rebranding to become Shell Energy in 2019, the supplier has a big customer base and a well-established service. It offers customers a good range of energy tariffs, lots of smart technology to make your home more efficient and 100% renewable electricity.

Based in London, So Energy is a 100% green independent energy supplier which began operating in the UK in 2015. So Energy UK believes energy companies can be simple, honest and offer good value to customers.

SSE is one of the UK’s biggest energy suppliers. In addition to supporting renewable energy and community events, they’re known for being the best of the bunch, with lower energy prices and better service than their Big Six competitors. But do they really deserve the hype? Read on to find out.

Utilita is an independent supplier specialising in prepayment energy. As of January 2020 the provider holds a 2% market share and supplies gas and electricity to approximately 600,000 customers throughout the UK.

As one of the UK’s newest energy suppliers, Utility Point claims to offer clear and affordable pricing. Since launching in 2017, the supplier's customer base has grown to over 100,000. The Poole-based energy supplier is determined to be recognized for its efficiency and dedication.

Utility Warehouse brands itself the nation’s most trusted utility supplier. Spending no money on advertising and instead relying on word-of-mouth, it has still managed to attract more than 650,000 customers to sign up.

Zebra Power is an independent energy supplier based in Manchester, England. Having only started trading in 2016, it has already made quite a name for itself, having a regular spot in the cheapest tariffs on the market. It has had a name change over the past couple of years, having started its operations under the name ‘Bor Energy’.

Zog Energy is an independent gas-only supplier that was founded in 2013. While its name may sound out of this world, Zog was founded by two Queens Award-winning engineers, Andrew Cleveland and Tony Chester, as a response to the poor customer service and high prices that they found in existing utility companies.

UK Energy Providers: Your Complete Guide

With more than 50 domestic energy providers in the UK, there are plenty of options to choose from. However, with so many providers, it can also be difficult to decide which is the best one for your home. In this guide, we analyse the different gas and electric suppliers in the UK so that you can make an informed decision about which one to switch to.


Energy Providers: A Brief History

According to the latest report from energy regulator Ofgem, there are 55 domestic energy providers in Great Britain as of the third quarter of 2020. These gas and electric suppliers can be broken down into the following categories:

  • Dual-fuel energy providers (both gas and electricity) — 48 companies
  • Electricity-only providers — two companies
  • Gas-only providers — five companies

Let’s have a brief look at how these gas and electric suppliers came to be.

Electricity Providers

The electricity sector was privatised in Great Britain in the early 1990s.The aim was to promote competition among companies and protect consumers’ interests. By 2005, just six electricity providers (known as the Big Six) supplied 99% of households.

This hold of 99% of the electricity market lasted until 2014 when smaller energy companies first started to come to the fore. In the years that followed, these smaller companies have continued to enter the market. One provider, OVO Energy, even acquired one of the original Big Six providers in January 2020.

For the third quarter of 2020, energy regulator Ofgem reported the electricity market shares as follows:

Note that Npower has since been absorbed by the Eon Group. All Npower customers will be transferred to Eon Next (a subsidiary of Eon) over the coming months. This acquisition makes Eon the second-largest electricity supplier in Great Britain, just behind British Gas.

Gas Providers

National gas supplier British Gas was created in 1972. It was then privatised in 1986 under Margaret Thatcher. The 'Tell Sid' campaign encouraged individuals to buy shares in the company. With an IPO of 135p per share, British Gas was valued at £9 billion. At the time, this was the highest equity offering ever.

The same Big Six energy companies emerged to dominate the gas market in the UK. As with the electricity market, these gas companies supplied 99% of the gas market share until 2014. As of the third quarter of 2020, there are 53 gas providers in Great Britain. We display their market shares in the chart below.

Who are the Big Six energy providers?

The term ‘Big Six’ is used to describe Britain’s six largest energy companies. Traditionally, the Big Six energy providers consisted of the following companies:

  • British Gas
  • Npower
  • Eon
  • Scottish Power
  • EDF
  • SSE

These Big Six energy providers dominated the energy market until the end of 2019. In 2005, they held a combined market share across both the gas and electricity markets of 100%. In the third quarter of 2019, they had a combined electricity market share of 70% and a combined gas market share of 69% in Great Britain.

At the end of 2019, Npower was acquired by fellow Big Six provider Eon. In January 2020, SSE was acquired by OVO Energy.

There are now seven major players in the GB energy market. These companies all have more than 5% of both the electricity and gas market shares. In descending order, the following energy providers are currently Britain’s largest suppliers.

Who are the cheapest energy suppliers?

In the following table, we’ve listed the suppliers with the cheapest tariffs. Calculations are based on a medium-sized home in London with average consumption levels, which is 2,900 kWh of electricity and 12,000 kWh of gas. All of these tariffs have a direct debit payment method.

Cheapest Dual Fuel Tariffs
Provider Cheapest tariff Estimated annual spend Exit fee
PFP Energy Green Variable s2 Paperless £842.31 None
Orbit Energy Spring Vari-Save Extra £854.05 None
Neo Energy NEO 4.1 £856.40 None
Green Yew £898.02 None
Outfox the Market Spring 21 Variable £900.48 None
GOTO Energy Standard Variable £924.58 None
People's Energy Fixed Super Tariff £937.00 £30 per fuel
Avro Energy Simple and Saver 12M £944.38 None
Utility Point Just Up 21 £955.22 £36 per fuel
Igloo Energy Pioneer £961.84 None

*Figures are for illustrative purposes only. Calculations based on a three-bedroom house in London with average energy consumption. Figures last updated May 2021.

Which are the best-rated energy providers?

While price is often the most important factor people examine when choosing an energy provider, it’s also a good idea to consider the quality of the company’s customer service.

Citizens Advice compares UK energy providers in terms of customer service on a quarterly basis. The organisation rates suppliers across the following categories:

  • Average call-wait time
  • Number of complaints per 10,000 customers
  • Customers that received an accurate bill during the past year
  • Bills and statements issued on time
  • Switches completed within 21 days
  • Customer guarantees

You can find the best-rated energy companies accoring to the latest survey in the following table.

Citizen's Advice Customer Service Ranking: Top 5
Rank Energy Supplier Rating
1 Igloo Energy 4.4
2 M&S Energy 4.4
3 Outfox the Market 4.4
4 Co-operative Energy 4.15
5 Octopus Energy 4.15

Information from Citizen's Advice Last Updated May 2021

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Renewable Electricity Providers

Each year, all energy companies are required to disclose the different fuels from which they source electricity.

Being with a renewable energy supplier does not mean that the actual electricity you consume is 100% renewable. All of the electricity that is generated is put into the same grid before being distributed to individual homes.

According to Ofgems latest fuel mix report (which covers April 2019 through March 2020), the suppliers listed in the following table provide 100% renewable electricity.

100% Renewable Electricity Suppliers
Bristol Energy Good Energy London Energy
Bulb Goto Energy Octopus Energy
Co-operative Energy Green Outfox the Market
Economy 7 Energy Green Energy UK Pure Planet
Ecotricity M&S Energy Shell Energy
Foxglove Energy Hub Energy So Energy

Note that Eon (which has acquired Npower) and OVO Energy (which supplies SSE) claim they now provide 100% renewable electricity. The fuel mix information for this most recent period (1 April 2020 to 31 March 2021) must be disclosed by 1 October.

Prepayment Energy Providers

There are just over four million households with prepayment meters in Great Britain. This represents about 15% of all households.

When choosing an energy provider, prepayment customers don’t have as many options as customers with credit meters. This is because even though all gas and electric suppliers must provide pay-as-you-go (PAYG) tariffs to current customers with financial difficulties, only providers with more than 50,000 customers are required to offer prepayment plans to new customers.

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The following electricity and gas companies offer PAYG tariffs for new customers:

Business Energy Providers

In addition to domestic energy, there are also several providers that supply business energy. Unlike domestic providers, business energy providers don’t always publish their rates online. You will often need to contact the supplier to get a personalised business quote.

For more information on the most popular business energy providers, head to their relative guide:

Who is my current energy supplier?

Your energy supplier is the company you pay either your power or gas bill to. You can find out who your energy provider is in the following ways:

  • Take a look at your energy bill — You’ve likely received bills (or a welcome pack for prepayment customers) from your energy provider. It’s name should be on the documents.

  • Check your email — If you signed up for paperless billing, your provider will send you all your information via email. Try searching for “energy” in your inbox to find an email from your provider.

  • Contact your DNO — Your Distribution Network Operator (DNO) varies depending on where you live. Head to our DNO guide to find out who yours is.

  • Check your bank statements — Whether its online or paper statements, your energy providers name should appear on your bank statements.

If you’re still having troubling, head to our dedicated guide on finding your energy supplier.

How do I choose a gas and electricity supplier?

When choosing an energy provider for your home, there are a few different factors we recommend you consider. While some of these factors may seem obvious, others (that are just as important) can easily be overlooked.

  • Cost — Is it a good deal? To compare quotes, it’s best to use your own consumption levels. Not sure how much energy you use? Try using our consumption calculator.

  • Customer service — Can you count on the energy company to provide high-quality customer support?

  • Energy sources — Are you interested in doing your part to help save the planet? Choose an energy provider that supplies 100% renewable energy.

  • Exit fees — Will you be charged a fee for terminating your contract early? You may want to find an energy tariff without any exit fees if you’re only planning to stay at the property for a limited time.

Before starting to compare plans, we recommend you establish your priorities so that you can find the best energy provider to suit your needs.

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The services and products mentioned on this website may only represent a small selection of the options available to you. Selectra encourages that you carry out your own research and seek advice if necessary before making any decisions. We may receive commission from selected partner providers on sales of some products and/or services mentioned within this website. Our website is free to use, and the commission we receive does not affect our opinion or the information we provide.