UK Energy Suppliers List 2026: Gas and Electricity Brands

Looking for a list of UK energy suppliers? The table below shows every household gas and electricity supplier brand we could verify on 13 October 2026: who owns it, which Ofgem licensee supplies it and whether it is taking new customers. If you want to know who supplies your own home, use our guide to finding your energy supplier instead.

The list covers Great Britain. Northern Ireland has a separate energy market.

How many energy suppliers are there in the UK?

Ofgem counted 17 active suppliers in the domestic gas and electricity market as of March 2026: 16 selling both fuels and one selling electricity only. The figure comes from Ofgem's retail market indicators.

Far more companies hold a licence. Ofgem's gas list dated 30 September 2026 names 46 companies in its domestic and non-domestic gas supply category, and its electricity list names 62 in the matching electricity category. A licence that allows household supply does not mean a company sells to homes today.

Brands and suppliers are not the same thing either. Some suppliers sell under more than one brand, and some brands run on another company's licence. The table shows both.

UK gas and electricity suppliers list

How to read the table. "Yes" means the brand's own website offered a household quote or sign-up journey when we checked on 13 October 2026. It does not confirm a tariff for your address. "Not checked" means we could not confirm that from the website. Fuels are the domestic supply licences the licensee holds in Ofgem's lists. Owners come from each supplier's website or the licensee's record at Companies House.

The big six, then and now

The big six were the six large firms the Competition and Markets Authority (CMA) examined in its 2016 energy market investigation: Centrica (British Gas), EDF Energy, E.ON, RWE npower, SSE and ScottishPower. The CMA called them the former monopoly suppliers and said that together they supplied just under 90% of domestic customers in Great Britain at the time (CMA summary of final report, June 2016).

The six are now four groups:

• Centrica still owns British Gas.
• EDF and ScottishPower, which is part of the Iberdrola group, still sell under their own names.
• E.ON owns npower's old supply company. Companies House shows Npower Direct Ltd was renamed E.ON Next Energy Ltd in June 2020.
• SSE's electricity supply company passed to OVO in January 2020, when Companies House records it was renamed OVO (S) Electricity Ltd. OVO says it welcomed over 3.5 million new customers that year, and E.ON has since bought OVO.

Newer suppliers have grown alongside them. Octopus Energy says it was a tiny supplier in 2016 and now powers over 10 million homes in Britain and abroad. Market shares move every quarter, so treat any ranking with care. For current figures, Ofgem's retail market indicators chart each company's share of domestic electricity and gas supply in Great Britain.

Recent consolidation: E.ON has bought OVO

E.ON completed its purchase of OVO on 8 October 2026 (E.ON announcement). The CMA cleared the deal at Phase 1 on 1 October 2026 and published its full decision on 6 October (CMA case page).

E.ON says there is no immediate change for customers of E.ON Next or OVO. Existing tariffs are honoured in full, customer service channels continue as they are, and customers will get plenty of notice of any future change that affects them. OVO's own website tells its customers they do not need to do anything.

OVO keeps its own row because it still sells under its own name and licences. If you are with OVO, our E.ON and OVO guide covers what to check now.

The Ofgem licensee register explained

Ofgem publishes two licensee lists, one for gas and one for electricity. Both pages were updated on 8 October 2026 and link to lists dated 30 September 2026.

The lists cover every licence type, not only household suppliers. They include gas shippers and transporters, electricity generators and distributors, interconnectors and suppliers that serve only businesses. For a home, the categories that matter are gas supply (domestic and non-domestic) and electricity supply (domestic and non-domestic).

Each list says it is not a formal public register document and should not be relied on. For a formal licensing check, use Ofgem's public register or contact Ofgem's licensing team.

A brand name and the licensed company behind it often differ. Check the legal company named on your quote, contract or bill against the table above.

Which of these can Taupia switch you to?

Taupia compares tariffs from 19 suppliers, around 90% of the Great Britain energy market by its November 2025 coverage audit. It shows every deal it finds, and it can complete a switch to four suppliers once you approve: British Gas, E.ON Next, So Energy and Fuse Energy. See the full comparison set on our supported suppliers page.

Your current supplier does not need to be on that list. Taupia reads your bill whoever supplies you. To see where your tariff stands, compare energy prices or check a recent bill in Taupia. Nothing switches without your approval.