View energy suppliers: A to Z list

Here's everything you need to know about the UK's top energy suppliers, all in one place.

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There are dozens of energy suppliers in the UK, with companies entering and leaving the market. Some of the main suppliers are:

British Gas

British Gas logoBritish Gas remains the largest energy provider in the UK, supplying more than 7 million households. It used to be the sole energy provider for the UK, until it was privatised in 1986.

The majority of online reviews and studies state that the range and price of tariffs, as well as the level of customer service, is pretty mediocre. To be fair, the firm has improved and widened its services in recent years, but customers’ experiences are still mixed. If you’re a traditionalist who doesn’t like to try out new companies, British Gas is the energy supplier for you.

Indeed, statistics suggest that a fair percentage of its customers have stayed loyal for an incredibly long time.

E.ON Next

EDF logoE.ON Next is the second largest energy provider operating in the UK in customer numbers after British Gas. It forms part of what used to be called the Big Six energy companies. The German company serves over 5.6 million British households.

The electricity used by its residential customers on fixed tariffs is backed by 100% renewable sources.

It is rarely ranked among the best companies for price or customer service, but if you’re after a large energy provider which focuses on renewable energy, E.ON Next could be next on your list.

EDF Energy

EDF logoFrench-government-owned EDF Energy is another one of the former Big Six energy companies. It controls many of the UK’s nuclear power stations and two-thirds of the electricity it supplies its customers comes from nuclear energy.

As is typically the case with larger “legacy” suppliers, it’s rarely listed among the best-value tariffs, nor praised for having the best customer service.

EDF prides itself in offering lengthy fixed-rate tariffs – some as long as 3 years – so it might be the provider for you if you’re worried about mid-contract price rises.


Scottish Power logoScottishPower is based in Glasgow, but serves energy to customers all over the UK. It was founded in 1990 and grew to become a Big Six provider. Now owned by Spanish utilities giant Iberdrola, it’s the largest supplier of renewable energy generated by wind in the UK. In fact, its green energy tariffs are generated 100% from its UK wind farms.

ScottishPower isn’t well-known for fantastic prices or mind-blowing customer service, but it does offer fixed-rate contracts up to 2 years.

OVO Energy

Ovo energy logoOVO Energy has established a reputation as a strong green energy provider. In 2020, the Bristol-based supplier acquired the domestic energy division of former Big Six competitor SSE.

It was the first supplier to remove coal and nuclear from its energy mix and has received plenty of plaudits for its “Plan Zero” initiative to create a zero-carbon future. If you want to do your bit for the environment while still paying a competitive rate for your energy, check OVO’s tariffs.

Octopus Energy

Octopus logoSince launching in 2016, Octopus Energy has raised the bar for customer service in the energy sector. It offers 100% renewable energy, yet still manages to offer competitive prices among its energy tariffs. Octopus has been growing pretty quickly and now supplies over 5 million UK homes.

In recent years the supplier, which is backed by the UK financial services group of the same name, has grown through acquisitions and deals with firms like Co-op Energy and Engie. Its offering is relatively simple, providing a choice of supply deals including fixed, variable and “supergreen” tariffs, none of which charge exit fees. If you’re looking for competitive tariffs with strong green credentials, this cephalopod is certainly worth a look.

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