The main reason to switch suppliers is, quite simply, to save money. Once your contract ends with any particular supplier, they will continue to supply energy to your home, but you’ll likely be paying a lot more than you need to for it.
This is because suppliers invariably roll their customers onto their most expensive tariffs once their initial contract has ended – which usually lasts 12 months.
If you’ve not switched your energy supplier for a few years, or even if you’ve never switched at all, the chances are that you could be saving hundreds of pounds a year by finding a cheaper energy deal. Compare energy suppliers now to see how much you could save.
Choosing a new supplier can be as simple as picking the cheapest plan on offer in your area. But providers differ on more than just price. We've put together some pointers explaining the kinds of things you should consider below to help you make your decision:
Ultimately, you should go with whichever supplier will offer you the right deal at the right price. Most people in the UK are with one of just a handful of large suppliers, usually referred to as the 'big six'*. This is more out of habit than anything else - it's easy to gravitate towards big names.
This isn't to say you won't get a good deal from a big six supplier (far from it), but it is always worth looking further afield, particularly if you've got specific requirements like wanting a fully green supplier.
*With recent mergers, the big six isn't really a 'six' any more - read our guide on the big six and large suppliers for more information.
Domestic energy usage accounts for a huge portion of our national greenhouse gas emissions, and so choosing a green supplier for your home can make a big difference.
The gas and electricity your home receives comes from the national grid. This doesn't change based on your supplier. But each supplier puts energy from different sources into the grid, and green suppliers are those that provide wholly renewable electricity (and carbon offset gas). You can check each supplier’s energy fuel mix on their individual pages.See deals from green suppliers
In order to pick a supplier based on their green credentials, you'll need to check where their sourcing their energy from. Each supplier is obliged to publish fuel mix data after a certain number of years, and we've collected balances for the top 10 here:
Hopefully you won't have to deal with your supplier's customer service team very often if at all. But if you do, you want it to be as smooth an experience as possible. No lengthy waits on hold, no back and forth with a robotic online text service without any solutions to your problems. We've compiled a list of the best suppliers by customer service as rated by Which? in 2021:
|Energy supplier||Which? customer score|
|Outfox the Market||82%|
When you compare with us, we can show you results from the whole of the market, including the suppliers that we are unable to switch you to right away. You may still be able to get those deals by contacting the supplier directly, and organising correspondence with your current supplier, but with those listed below, we can get you set up in a matter of minutes.
As one of the largest six energy companies in the UK, British Gas, provides power to millions of homes every day.
E.ON is one of the largest energy providers in the country, providing power and heating to around 5 million homes.
EDF Energy supplies 1/5th of the UK’s electricity supply.
npower is the UK's third largest energy supplier, and run a bunch of great initiatives geared towards improving their environmental impact
Scottish Power was founded in 2009 and supplies electricity and gas across the UK as one the nation's big six.
SSE is the second largest energy provider in the UK, and now offers a range of telecoms and broadband services as well.
Although Avro Energy may not be among the top ten energy providers in the UK, it is still rated higher in terms of customer service as compared to the Big Six.
Bulb offers some of the most competitive prices on the market and supply 100% renewable energy.
Co-op Energy have partnered with Octopus Energy, committing to fairly priced and competitive services built on strong community values.
Think of yourself as environmentally aware? Ecotricity is definitely a supplier worth considering.
Green Network Energy has made a name for itself in a very short time for being a values-driven, environmentally responsible business.
Green Star Energy started in 2013 and has become a well trusted green energy provider, offering 100% renewable power to houses up and down the UK.
iSupply is a popular, low-priced energy supplier offering 100% renewable power to households around the UK.
When it comes to paving the way towards a greener future, Octopus Energy are leading the pack.
OVO Energy is one of the many smaller suppliers attempting to disrupt the Big Six' monopoly on the market.
In 2011 Sainsbury's joined the ever-growing energy market via a partnership with British Gas.
Thinking about changing energy suppliers? Shell Energy is the UK’s largest independent energy supplier and it offers 100% renewable energy.
So Energy prides itself on being among the simplest, most transparent energy providers in the market, offering 100% renewable power
Spark was started by individuals from the letting industry who used this experience to sell energy mainly to landlords, letting agents and tenants.
Together Energy offer affordable energy while combating the issue of fuel poverty in Scotland.
If you are on the lookout for an affordable smart meter provider, then Utilita Energy will definitely meet your needs.
Utility Warehouse is a convenient option for homeowners that don’t want to deal with multiple suppliers.