Who are the UK's main energy suppliers?

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Who are the Big Six?

Britain's largest energy suppliers are known collectively as the 'Big Six', and between them they supply gas and electricity to over 50 million homes and businesses across the UK.

The Big Six are also the UK's longest running private energy suppliers, having all formed during the 1990s following the passing of the 1989 Electricity Act, which paved the way for the privatisation of the energy sector.

Energy supply isn't all about the Big Six though - a growing number of smaller independent suppliers have been entering the UK market since 1997, with the aim of providing real competition for the major providers and creating a fairer market for consumers in the process.

UKPower compares all suppliers for the home energy market, so you can be sure we'll find you the best deal on gas and electricity.

The Big Six Energy Suppliers

Compare British Gas Electricity and Gas Prices Compare British Gas Electricity and Gas Prices
  • Leading Big Six energy supplier in the UK.
  • British Gas is owned by parent company Centrica.
  • British Gas supply 15 million homes in the UK.
Compare EDF Energy Gas and Electricity Prices Compare EDF Energy Gas and Electricity Prices
  • Largest producer of electricity in the UK.
  • EDF Energy is a French state owned company.
  • EDF Energy supplied 5.6 million homes in the UK.
Compare E.ON Energy Gas and Electricity Prices Compare E.ON Energy Gas and Electricity Prices
  • UK market leader is producing combined heat and power.
  • E.ON is the world's largest investor owned utility service.
  • E.ON serves over 26 million customers.
Compare Npower Gas and Electricity Prices Compare Npower Gas and Electricity Prices
  • Npower is owned by German company RWE.
  • Previously npower was known as Innogy.
  • Npower supply gas and electricity to 6.5 million customers in the UK.
Compare Scottish Power Gas and Electricity Prices Compare Scottish Power Gas and Electricity Prices
  • Scottish Power is owned by Spanish parent company Iberdrola.
  • One of the smaller of the Big Six energy companies.
  • Scottish Power serve 5.3 million customers in the UK.
Compare SSE Gas and Electricity Prices Compare SSE Gas and Electricity Prices
  • SSE trade under different names, including SSE, SWALEC and Scottish Hydro depending on the region.
  • SSE is the second largest Big Six supplier in the UK.
  • SSE supply 9.1 million customers in the UK.

What other energy suppliers are available?

The Big Six may be the UK's biggest and best-known energy suppliers, but that doesn't necessarily mean they're the best - the growing number of smaller energy suppliers means there's a greater choice than ever, so make sure you shop around for the best deal on gas and electricity.

You may even find these less well-known providers not only offer the best gas and electricity rates, but also better customer care and after-sales service.

Other energy suppliers

Compare Affect Energy Gas and Electricity Prices Compare Affect Energy Gas and Electricity Prices
  • A team of ex-employees who used to work for one of the Big Six.
  • Over 50-years' combined experience in the energy market.
  • Affect energy pride themselves on their level of customer service.
Compare Angelic Energy Gas and Electricity Prices Compare Angelic Energy Gas and Electricity Prices
  • Not-for-profit energy provider owned by Islington Council.
  • Offers residents and alternative to the Bix Six energy providers.
  • Easy-to-understand terms and pricing - no confusing jargon or complicated tariffs.
Compare Avro Energy Gas and Electricity Prices Compare Avro Energy Gas and Electricity Prices
  • Avro Energy began trading in 2015.
  • They look to provide simple and competitively prices energy products.
  • Avro Energy is based in Nuneaton, Warwickshire.
Compare Better Energy Gas and Electricity Prices Compare Better Energy Gas and Electricity Prices
  • Better Energy began supplying energy to customers in 2011.
  • Better Energy currently only offers gas to customers.
  • Better Energy's motto is "Same energy, Better price".
Compare Boost Power Gas and Electricity Prices Compare Boost Power Gas and Electricity Prices
  • The new name for OVO ‘pay-as-you-go’ energy.
  • Aims to improve the prepayment energy market.
  • Energy use can be monitored and meters topped up using the Boost app.
Compare Breeze Energy Gas and Electricity Compare Breeze Energy Gas and Electricity
  • Aims to help people become more energy efficient.
  • Offers tips to help people use less energy and save money.
  • UK-based customer support team can be contacted by phone or email.
Compare Brighter World Energy Gas and Electricity Compare Brighter World Energy Gas and Electricity
  • Brighter World Energy began trading in 2016.
  • Every 2,000 customers who switch means they build a sustainable solar powered micro grid in a village in Africa.
  • Works in partnership with not-for-profit supplier Robin Hood Energy.
Compare Bristol Energy Gas and Electricity Prices Compare Bristol Energy Gas and Electricity Prices
  • Bristol Energy committed to local development and reinvestment.
  • They pride themselves on a transparent service.
  • Bristol Energy supply around 10,000 customers in Britain.
Compare Bulb Energy Gas and Electricity Prices Compare Bulb Energy Gas and Electricity Prices
  • Bulb specialise in renewable energy products.
  • They look to take on the Big Six by empowering their customers.
  • Bulb Energy supports independent renewable generators.
Compare Co-op Energy Gas and Electricity Prices Compare Co-op Energy Gas and Electricity Prices
  • Only UK supplier to be owned by their customers.
  • Coop Energy has been operating since 2010.
  • Coop Energy boast a fair and transparent service.
Compare Daligas Gas Tariffs Rates & Prices Compare Daligas Gas Tariffs Rates & Prices
  • Only offer gas to their customers.
  • Helps SMEs with a simplified pricing structure.
  • Boast a transparent and trustworthy service.
Compare Ebico Gas and Electricity Prices Compare Ebico Gas and Electricity Prices
  • EBICo was founded in 2008.
  • One of the few suppliers who offer zero standing charge tariffs.
  • EBICo also offer competitive pay-as-you-go tariffs.
Compare Economy 7 Gas and Electricity Prices Compare Economy 7 Gas and Electricity Prices
  • Offers a cheaper rate during seven night-time hours.
  • Special Economy 7 meters show your day rate and discounted rate.
  • See how much you could save by switching to Economy 7.
Compare Economy Energy Gas and Electricity Prices Compare Economy Energy Gas and Electricity Prices
  • Economy Energy fight to keep their customer's bills falling.
  • Over 5% of their energy is generated from renewable sources.
  • Boast a service that has local communities at its heart.
Compare Ecotricity Gas and Electricity Prices Compare Ecotricity Gas and Electricity Prices
  • Ecotricity are always looking for new ways to invest in green energy sources.
  • Ecotricity regularly feature amongst the top of Which's satisfaction survey.
  • Ecotiricty is not-for-dividend, which means their customers always come first.
Compare E Energy Gas and Electricity Prices Compare E Energy Gas and Electricity Prices
  • British-owned energy company based in Birmingham.
  • Aim is to keeping costs down so customers pay less.
  • Tariffs are simple and straightforward to helps customers choose the best deal.
Compare EnergySW Gas and Electricity Prices Compare EnergySW Gas and Electricity Prices
  • Energy SW work alongside OVO to offer improved levels of customer service.
  • Offer competitive pricing.
  • Offer per-payment meters for landlords to help residents enjoy savings as well.
Compare Engie Gas and Electricity Prices Compare Engie Gas and Electricity Prices
  • ENGIE look to push boundaries in low carbon energy solutions.
  • They offer data led energy products to help customers save money.
  • Serve more than 14,000 customers in both public and private sectors.
Compare Entice Energy Gas and Electricity Prices Compare Entice Energy Gas and Electricity Prices
  • Entice Energy offers low cost gas to homes all over the UK.
  • Their service boasts a state of the art online account service.
  • Each customer has access to an account manager.
Compare Extra Energy Gas and Electricity Prices Compare Extra Energy Gas and Electricity Prices
  • Extra Energy is the sister company of German company extraenergie.
  • Considered a main challenger to the Big Six.
  • Aim to offer low prices with excellent service standards.
Compare Fairerpower Gas and Electricity Prices Compare Fairerpower Gas and Electricity Prices
  • Provides competitive energy prices to residents of Cheshire East.
  • Run by Cheshire East Council, who have partnered with OVO.
  • Payments will be collected by OVO on behalf of Fairerpower.
Compare Fischer Energy Gas and Electricity Prices Compare Fischer Energy Gas and Electricity Prices
  • Fischer puts customers first to value fairness, honesty and loyalty.
  • Offers just one tariff, its ‘One Fair Tariff’ do deliver one competitive price to all.
  • Family-run company that delivers for customers and not shareholders.
Compare Flow Energy Gas and Electricity Prices Compare Flow Energy Gas and Electricity Prices
  • Flow Energy employ market leaders to deliver the best prices for customers.
  • Their UK-based customer service team can offer support every step of the way.
  • Pioneers of the electricity-generating Flow boiler.
Compare Future Energy Gas and Electricity Prices Compare Future Energy Gas and Electricity Prices
  • Future Energy can boast low prices as well as transparent billing.
  • Based in Newcastle and prodominently supplies the North East of England.
  • Offer both gas and electricity products as part of their service.
Compare GB Energy Gas and Electricity Prices Compare GB Energy Gas and Electricity Prices
  • Part of Co-operative Energy from 2016.
  • Provides gas and electricity to over 140,000 homes across the UK.
  • Ambition is to offer fair, competitive, no gimmicks prices to all customers.
Compare GnERGY Gas and Electricity Prices Compare GnERGY Gas and Electricity Prices
  • GnERGY is a new breed of community suppliers.
  • They aim to offer gas and electricity in an open and honest way.
  • They boast a multi lingual UK-based call center.
Compare Go Effortless Energy Gas and Electricity Compare Go Effortless Energy Gas and Electricity
  • Go Effortless Energy is built from the ground-up using customer perspective.
  • They offer one honest simple and fair tariff to all their customers.
  • They steer clear of misleading lyalty bonuses and cash-back schemes.
Compare Good Energy Gas and Electricity Prices Compare Good Energy Gas and Electricity Prices
  • Good Energy offers renewable energy products.
  • Founded in 1999, they were the first supplier to have a 100% renewable energy fuel mix.
  • Good Energy has an expanding community of generators across the UK.
Compare Great North Gas and Electricity Prices Compare Great North Gas and Electricity Prices
  • Not-for-profit energy provider owned by Doncaster Council, in partnership with Robin Hood Energy.
  • Provides low cost, fair and transparent pricing and choice along with quality customer service.
  • A real alternative to expensive tariffs, especially prepayment customers.
Compare Green Energy UK Gas and Electricity Compare Green Energy UK Gas and Electricity
  • Green Energy can supply domestic and business customers.
  • They buy energy from anyone generating their own surplus electricity.
  • They also offer lower cost products by harnessing the power of water, wind and sun.
Compare Green Network Energy Gas and Electricity Compare Green Network Energy Gas and Electricity
  • An Italian energy company founded in 2003, it supplies energy to Italy and the UK.
  • Aims to challenge the Big Six by operating with passion and innovation.
  • Offers customers more choice when it comes to managing energy needs.
Compare Green Star Energy Gas and Electricity Compare Green Star Energy Gas and Electricity
  • Offer gas and electricity to customers across the UK.
  • Part of the larger American group Just Energy.
  • They state their aim as a company looking to develop cost effective energy solutions for their customers.
Compare iSupply Energy Gas and Electricity Prices Compare iSupply Energy Gas and Electricity Prices
  • iSupply is based in Bournemouth and launched in 2012.
  • Their mission is to provide low pricing and easy access to an online management account.
  • iSupply prioritise price and service for their customers.
Compare LECCY Gas and Electricity Prices Compare LECCY Gas and Electricity Prices
  • Liverpool-based offering low-cost energy to the city and surrounding areas.
  • No shareholder or director bonuses means all profits go into keeping prices low for customers.
  • Works to support prepayment customers and help them move onto the best and cheapest alternatives and put them in control of their energy bills.
Compare M&S Energy gas and electricity prices Compare M&S Energy gas and electricity prices
  • Work in partnership with Octopus Energy.
  • M&S Energy prides itself in offering straightforward energy options to customers.
  • Not available in the Channel Islands, Isle of Man, Ireland and Northern Ireland.
Compare Nabuh Energy Gas and Electricity Prices Compare Nabuh Energy Gas and Electricity Prices
  • Aims to offer honest, simple and cheaper pricing to its customers.
  • Focus on technology to put itself at the forefront of both prepay and direct debit markets.
  • Aims to save customers money by offering an alternative to the Big Six.
Compare Octopus Energy Gas and Electricity Prices Compare Octopus Energy Gas and Electricity Prices
  • Octopus is the largest investor in solar farms.
  • Octopus offers a better experience for customers through transparency, honesty and simplicity.
  • Puts the planet first with long term investment in low CO2 alternatives.
Compare OneSelect Gas and Electricity Prices Compare OneSelect Gas and Electricity Prices
  • Shows customers how and when they use energy, to keep them in control.
  • Simple and transparent pricing so customers know exactly what they’re paying for.
  • Offers one simple, 12-month, fixed-rate tariff, with no exit fees.
Compare Our Power Gas and Electricity Prices Compare Our Power Gas and Electricity Prices
  • Energy supplier established by Scottish social housing providers.
  • Aims to reduce heat and fuel costs by passing benefits from the energy sector to residents and communities.
  • Generates its own power and reinvests profits to help benefit customers.
Compare Outfox the Market Gas and Electricity Compare Outfox the Market Gas and Electricity
  • Outfox the Market offers a customer-led energy alternative.
  • Energy is bought at wholesale from 100% renewable sources.
  • Gas and electricity is available with no contract tie-ins.
Compare OVO Energy Gas and Electricity Compare OVO Energy Gas and Electricity
  • An environmentally-conscious energy supplier aiming to make renewable energy available to all.
  • Offers a 100% renewable tariff for those who want to do more for the environment.
  • Boost publishes an annual environmental impact report and is working to achieve the Carbon Trust Standard.
Compare Peterborough Energy Gas and Electricity Compare Peterborough Energy Gas and Electricity
  • Offers local residents to Peterborough fair and competitive prices.
  • In partnership with OVO.
  • OVO will collect payments on Peterborough Energy's behalf.
Compare PFP Energy Gas and Electricity Prices Compare PFP Energy Gas and Electricity Prices
  • PFP Energy offers simple tariffs and bills, so you know exactly what you're getting.
  • Offer discounts for online accounts and direct debits.
  • Owned by the PFP Group, PFP Energy launched in 2015.
Compare Powershop Gas and Electricity Prices Compare Powershop Gas and Electricity Prices
  • Offers an innovative and unique way to buy and sell-back energy.
  • Transparent pricing to keep customers in control.
  • A really different alternative with customer satisfaction ratings of 90%.
Compare Ram Energy Gas and Electricity Prices Compare Ram Energy Gas and Electricity Prices
  • A not-for-profit supplier, owned by Derby City Council to supply the people of Derby and the midlands.
  • No shareholder or director bonuses means all profits go into keeping prices low for customers.
  • Aim to provide energy at the lowest price possible.
Compare Sainsbury's Energy Gas and Electricity Compare Sainsbury's Energy Gas and Electricity
  • Sainsbury's Energy works in association with British Gas.
  • The look to provide customer service and energy expertise.
  • Offer gas, electricity and boiler services.
Compare Shell Energy gas and electricity prices Compare Shell Energy gas and electricity prices
  • 100% renewable electricity
Compare So Energy Gas and Electricity Prices Compare So Energy Gas and Electricity Prices
  • So Energy was set up to restore customer trust in suppliers.
  • Committed to delivering low prices for their customers.
  • A simplistic approach and the latest technology gives So Energy a competitive edge.
Compare Solarplicity Energy Gas and Electricity Compare Solarplicity Energy Gas and Electricity
  • An independent, British energy supplier set up in 2009 to offer a green energy alternative.
  • Originally a solar energy provider, its now evolved to offer more alternatives.
  • 100% renewable, ethical and affordable energy for all.
Compare Southend Energy Gas and Electricity Compare Southend Energy Gas and Electricity
  • Southend Energy works in partnership with OVO.
  • Dedicated to bringing competitive energy prices to Southend-On-Sea Borough Council.
  • Focus not just on low prices, but also sustainable prices.
Compare Spark Energy Gas and Electricity Prices Compare Spark Energy Gas and Electricity Prices
  • The only suppliers built around the UK lettings industry.
  • Offer tenants a tailored service and better value than the Big Six alternatives.
  • Utilise customer feedback to constantly improve their service.
Compare SSE Atlantic Gas and Electricity Prices Compare SSE Atlantic Gas and Electricity Prices
  • Part of the SSE group, a member of the Big Six.
  • Offers gas and electricity to prepayment and credit customers.
  • Customer-focussed with UK-based call centres.
Compare SSE Scottish Hydro Gas and Electricity Compare SSE Scottish Hydro Gas and Electricity
  • Part of the SSE group, a member of the Big Six.
  • Offers gas and electricity to prepayment and credit customers.
  • Customer-focussed with UK-based call centres.
Compare SSE Southern Electric Energy Prices Compare SSE Southern Electric Energy Prices
  • Part of the SSE group, a member of the Big Six.
  • Offers gas and electricity to prepayment and credit customers.
  • Customer-focussed with UK-based call centres.
Compare SSE SWALEC Gas and Electricity Compare SSE SWALEC Gas and Electricity
  • Part of the SSE group, a member of the Big Six.
  • Supplies Energy to Wales and the south west.
  • Customer-focussed with UK-based call centres.
Compare The Energy Deal Gas and Electricity Compare The Energy Deal Gas and Electricity
  • Providing customers with low energy prices and great customer service.
  • Can contact by phone, email or on social media.
  • Aims to save 100,000 customers £20m over the next three years.
Compare Together Energy Gas and Electricity Compare Together Energy Gas and Electricity
Compare Tonik Energy Gas and Electricity Prices Compare Tonik Energy Gas and Electricity Prices
  • Tonik Energy is looking to halve customer bills by 2020.
  • They offer fari prices through smart technology and transparent pricing.
  • Tonik Energy is based in Birmingham.
Compare TOTO Energy Gas and Electricity Prices Compare TOTO Energy Gas and Electricity Prices
  • TOTO Energy offers customers low prices by purchasing energy at wholesale.
  • They offer a variety of payment methods to suit all customer's needs.
  • Look to provide offerings cheaper than the Big Six.
Compare Usio Energy Gas and Electricity Prices Compare Usio Energy Gas and Electricity Prices

Usio Energy entered the market in 2017. They are a small gas and electricity supplier based in London.

Compare Utilita Energy Gas and Electricity Prices Compare Utilita Energy Gas and Electricity Prices
  • Utilita is the leading provider of pre-payment meters in the UK.
  • Utilita puts per payment customers first to offer them a better deal.
  • Payments can be sent to a meter remotely, allowing customers more freedom.
Compare Utility Point Gas and Electricity Prices Compare Utility Point Gas and Electricity Prices

Utility Point entered the energy market in 2017. They are a small gas and electricity supplier based in Dorset.

Compare Utility Warehouse Gas and Electricity Compare Utility Warehouse Gas and Electricity
  • At least 0.5% cheaper than the Big Six.
  • Utility Warehouse will always put you on their cheapest tariff.
  • Supplies more than 500,000 domestic and commercial customers.
Compare White Rose Energy Gas and Electricity Compare White Rose Energy Gas and Electricity
  • White Rose Energy was launched in 2016.
  • A not-for-profit supplier.
  • Serves customers in Yorkshire.
Compare Your Energy Sussex Gas and Electricity Compare Your Energy Sussex Gas and Electricity
  • Not-for-profit energy company supplying West Sussex, East Sussex and the surrounding areas.
  • Operated by a partnership of local councils who want people in Sussex to pay less for their energy.
  • Works in conjunction with Robin Hood Energy to supply low-cost gas and electricity.
Compare Zog Energy Gas and Electricity Prices Compare Zog Energy Gas and Electricity Prices
  • Zog Energy uses cloud computing to provide unrivalled customer service.
  • It's aim is to provide the best possible value energy to its customers.
  • They look to keep their own overheads down and pass savings on to customers.
First Utility is now Shell Energy First Utility is now Shell Energy
  • First Utility is now Shell Energy.
  • First Utility was the biggest supplier outside of the Big Six.
  • As a supplier they campaigned for positive changes, including faster switching.
Robin Hood Energy Robin Hood Energy
  • Robin Hood Energy is a not-for-profit supplier.
  • Boast a UK-based call centre.
  • Look to provide energy at the lowest price possible.

Are the Big Six the cheapest energy suppliers?

Although they're the most established energy companies, the Big Six are rarely the cheapest or the most trusted - because they tend to all raise their prices areound the same time, they're often accused of using their high profile and levels of control to unfairly raise gas and electricity prices.

Such accusations have proven to be unfounded, following investigations by both Ofgem, the energy regulator, and the Financial Conduct Authority (FCA), both of which oncluded that all of these companies had acted reasonably and responsibly, with regard to the setting of their prices.

The Big Six have traditionally dominated the gas and electricity markets, but figures from Ofgem shows that more and more smaller energy suppliers are eating into their market share - a situation that has undoubtedly been helped by the ease with which people can compare energy deals and switch suppliers.

This increased competition means you can save hundreds of pounds a year on your gas and electricity bills, just by swithcing away from the Big Six, as the table below shows:

Payment method Cheapest Big Six tariff Cheapest market tariff Saving
Direct Debit £1,050.87 £820.11 £230.76
Prepayment £1,028.21 £945.76 £82.45
Standard credit £1,028.21 £958.08 £70.13

As you can see, significant savings can be made whether you pay your energy bills via Direct Debit, which is often the cheapest payment method, prepayment meter, or by standard credit, such as making monthly or quaterly payments online or at the Post Office.

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How to switch energy provider

If you've never switched energy supplier, it's probably a lot easier than you imagine - just grab a recent energy bill and enter your postcode here to instantly compare the best deals currently on offer.

For the most accurate comparison results, take a look at your latest bill and input the necessary information about your household's energy usage. Don't worry if you don't have those details to hand though, you can still run a comparison using estimations based upon the type and size of your house.

Then simply review your options, pick a tariff that suits and confirm your switch online.

And that's it, the switch should take 17 days - that's three days for the switch, followed by a 14 day cooling off period.

If you're worried about having to pay exit charges for ending your current deal early, bear in mind it's possible to switch without paying any fees up to 45 days before your deal ends.

And remember, switching supplier doesn't involve any drilling at your property, or new pipework being installed - your gas and electricity will be still be supplied through the existing pipes and cables, you'll just be billed by a different provider.

Quickly compare your energy and save up to £477*

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