Who are the Best UK Energy Suppliers in 2021?

With energy suppliers facing different challenges every year, new ones appearing and some suppliers going bust, knowing who the best energy companies are can be challenging. Luckily with the help of Which? we've list the best & worst energy companies in the UK for 2021.

Although most of us switch energy suppliers to help lower our energy bills, there's actually much more to it than simply saving money.

If you choose a provider who has trouble billing you accurately or offers poor customer service, you could find they're more trouble than they're worth, regardless of their cheap energy prices.

That's why it's useful to know who the UK's best and worst gas and electricity suppliers are - the key to switching energy is making an informed decision on everything, including price.

Here is a rundown of the UK's best (and worst) energy suppliers, as revealed in this year's energy survey from Which?, the consumer magazine.

Who are the best energy suppliers in 2021?

Here is a list of the 10 best energy suppliers in 2021:

Energy SupplierWhich? Customer Score
Outfox the Market82%
Octopus Energy80%
Avro Energy76%
People's Energy75%
Pure Planet74%
So Energy73%
Utility Warehouse71%
OVO Energy70%
Sainsbury's Energy70%
Bulb Energy69%

No-one likes high energy rates, so it's hardly surprising that the UK's best energy companies all ranked highly in the 'Value for money' category.

But the ease with which households can switch suppliers means they can demand more than just cheaper energy bills - if energy companies don't measure up in terms of billing and customer service, those customers can vote with their feet and move on.

Outfox the Market is the new UK's number one energy supplier taking the top spot from Octopus Energy, getting a five-star rating in two of the five categories and a hugely impressive customer satisfaction score of 82%.

Who are the UK's worst energy suppliers in 2021?

In this list we show the worst energy suppliers in 2021:

Energy SupplierWhich? Customer Score
nPower54%
Scottish Power55%
SSE60%
Eon60%
EDF Energy61%
E61%
British Gas62%
Boost62%
Shell Energy63%
Bristol Energy64%

If you're with one of the big six energy suppliers, the chances are you're not 100% happy with the service you're getting - amazingly, five of the big six energy suppliers made up the bottom of the table as worst energy suppliers of 2021. British Gas didn't fair too much better getting a score of just 62%

Who are the best green energy suppliers in 2021?

Here is a list of the 10 best green energy suppliers in 2021:

Energy SupplierWhich? Customer Score
Outfox the Market82%
Octopus Energy80%
People's Energy75%
Pure Planet74%
So Energy73%
OVO Energy70%
Bulb Energy69%
Green Energy UK68%
Ecotricity66%
Utility Point65%

What is the Which? Annual Energy Survey?

Each year, Which? runs a survey of 8,000 energy users to drill down into which UK energy suppliers are offering the best overall service, taking into account the following:

  • Bill accuracy
  • Customer service (phone)
  • Customer service (online)
  • Complaints handling
  • Helping you understand and reduce energy use
  • Value for money

When the results are in, each supplier is given a percentage rating, which dictates their final position in the table.

Check out this year's results to find out where your supplier ranks.

What to do if you're unhappy with your energy supplier

If you're unhappy with your supplier, you can formally raise a complaint. The first thing to do in this instance is complain directly to your supplier, either in writing or by email so you have a written record of the complaint.

They will then have eight weeks to respond. If they don't, or they don't resolve the issue to your satisfaction, you can then escalate the complaint to the energy ombudsman. For more details on how to make an energy complaint, go to our energy supplier complaints page.

But the best thing to do if you're unhappy with your energy supplier is to switch to a different one - and you can compare energy suppliers online in just a few clicks with The Energy Shop.

To compare gas and electricity prices with The Energy Shop, just enter your postcode in the box at the top of the page and you'll be taken to our energy price comparison tool, where we just need a few more details to find the best gas and electricity deals in your area.

We'll then compare energy tariffs from suppliers across the entire energy market, so you can be sure there's a money-saving deal that's right for you.

When you find an energy deal you like, just click to switch and we'll take care of the rest - our switching tool will automatically send your application securely to your supplier of choice, who will then let your current supplier know that you want to leave.

The energy switch should then be completed within 21 days, meaning you'll be enjoying lower energy bills within a matter of weeks.

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