Who Owns Which UK Energy Supplier: Parent Companies and Groups

Heating the UK's 28 million homes accounted for 18% of all UK greenhouse gas emissions in 2021, and the companies that sell the gas and electricity behind that heating are fewer and bigger than the brand names suggest¹. As of April 2026 there were 17 energy suppliers operating in the UK², and six large companies between them hold 91% of the domestic market³. Octopus is now the largest electricity supplier in Great Britain³, while the names many households grew up with, British Gas, EDF Energy and ScottishPower, all sit inside larger corporate groups, some of them owned from overseas.

The name on your bill is a brand, not necessarily a company. British Gas is owned by Centrica plc; EDF Energy is French-owned; and plenty of familiar names on bills and comparison sites are white label brands that hold no supply licence at all, selling tariffs supplied by a licensed partner behind the scenes. This page maps the brands to the groups that own them, explains how those arrangements work, and shows how to check which licensed company you are actually with. For the wider picture of the market, see our guide to UK energy suppliers.

Who powers Britain's 28 million homes and who regulates them

The scale of the domestic market is easy to underestimate. The UK has around 28 million homes, and heating them accounted for 18% of all UK greenhouse gas emissions in 2021¹. Back in 2011, 84% of UK households, some 21 million, were on dual-fuel energy bills, taking both gas and electricity from a supplier⁶. That is a vast customer base spread across a small number of licensed companies: 17 suppliers as of April 2026², with six large companies dominating the domestic market on a 91% share³.

Every one of those suppliers answers to Ofgem, which describes itself as "the independent energy regulator for England, Scotland and Wales (Great Britain)"⁷. Holding a supply licence is what allows a company to sell energy to households at all: when Ofgem granted Tesla Energy Ventures Limited an electricity supply licence in March 2026, that licence authorised it "to supply electricity to domestic and non-domestic consumers in Great Britain"⁸. Northern Ireland sits outside this arrangement, with its own separate market and suppliers, which we cover in our guide to energy suppliers in Northern Ireland.

Beyond the regulator, suppliers also answer to the Energy Ombudsman when things go wrong. The Ombudsman states: "We only handle disputes involving suppliers trading in Britain."⁵ It is approved by Ofgem to handle service disputes in the energy sector⁵. So the chain of accountability runs from the brand on your bill to a licensed company, to Ofgem as regulator, and to the Ombudsman as the independent complaints body. Our page on complaining about an energy supplier explains how to use that chain in practice.

Energy UK: the industry body representing energy firms

Alongside the regulator and the complaints body sits a third kind of organisation: the trade association. Energy UK is the industry body that speaks for energy companies, including suppliers, and it is worth being clear about what that means for a household. A trade association represents its member companies. It does not issue licences, does not set the price cap, does not investigate complaints and cannot order a supplier to do anything. Those powers belong to Ofgem⁷ and, for disputes, the Energy Ombudsman⁵.

The distinction matters because suppliers operate inside a web of obligations that no trade association controls:

• An Ofgem licence authorises supply to domestic and non-domestic consumers in Great Britain⁸.
• The Energy Company Obligation places "legal obligations on larger energy suppliers to deliver energy efficiency measures to domestic premises"⁹.
• These are legal duties, not voluntary commitments negotiated by an industry body, and a supplier cannot opt out of them by leaving an association.

The backdrop to all of this is a country that the Treasury described in 2022 as "a net energy importer with a high dependence on gas and oil"¹⁰. The companies represented by trade associations are therefore operating in a market exposed to imported fuel and global prices, which is one reason the ownership and structure of the industry matters to households: the entities making decisions about your energy are plugged into international supply chains, not just a local company with a call centre.

Major suppliers grouped together: British Gas, Scottish Power and EDF Energy

The historical "Big Six" were, in Ofgem's own listing: "Centrica plc (parent company of British Gas), E.ON UK, Scottish and Southern Energy (SSE), RWE npower, EDF Energy and ScottishPower"⁷. That single sentence carries most of the ownership story for the traditional industry: British Gas is a brand within Centrica plc, and EDF Energy is the UK arm of a French state-backed group. Our guide to the Big Six energy suppliers traces what became of each of them.

The market has since reshuffled. As of March 2026, the largest suppliers by rank are:

British Gas remains the brand of Centrica plc, a British group⁷. So the top of the market is now a mix of a British group (Centrica), French ownership (EDF), German parentage behind E.ON Next, and the newer large entrants Octopus and OVO.

Ofgem's customer satisfaction survey shows how these groups are measured together. Its July 2024 sample bases were: "British Gas (1015), EDF Energy (371), E.ON / E.ON Next (including Sainsbury's Energy) (556), Octopus Energy (796), OVO Energy (373), Scottish Power (257), Utilita (130) respondents"¹¹. Note that Sainsbury's Energy, a separate brand, is counted inside the E.ON group: that is the white label effect in action, which the next sections explain. When Ofgem reviewed how suppliers support customers in vulnerable situations in 2022, its first group, found to have minor weaknesses, "consisted of British Gas, Bulb, EDF, E.ON, Ovo, Scottish Power and Utility Warehouse"¹².

White labels: selling energy under a brand without holding a licence

A white label arrangement lets a brand sell energy without ever holding a licence. Ofgem's definition, from its Retail Market Review consultation, is: "A 'white label' is an organisation that does not have an energy supply licence, eg a supermarket, but works in partnership with an energy supplier to offer energy tariffs to consumers under a different brand"¹³. The brand brings the customers, typically through its existing relationship with shoppers or members; the licensed supplier brings the licence, the meters, the billing engine and the regulatory obligations.

This is not a fringe activity. Ofgem reported in 2016 that "there are currently eight 'white label' suppliers" operating without supply licences of their own¹⁴. The contrast with a company like Tesla Energy Ventures, which went to the trouble of obtaining its own electricity supply licence covering Great Britain in March 2026⁸, shows the two routes into the market: buy or build your own licence, or partner with someone who already has one.

Branding freedom is part of the deal. Ofgem's fuel mix disclosure guidelines state: "These guidelines are not intended to prevent suppliers from branding their bills or other material sent to customers or undertaking special initiatives to raise brand awareness"¹⁵. So a household can receive bills, marketing and app notifications all in the white label brand's livery, while the licensed partner supplier remains the legally responsible company. We cover the consumer-facing side of this in our guide to white label energy brands.

White labels and their licensed partners: why the supplier of record counts

The licensed partner is not a technicality; it is the company that carries the obligations and the accountability. Ofgem's customer satisfaction surveys state the grouping rule plainly: "subsidiary brands such as white label brands are included in the supply group that is responsible for their customer service operations". The same rule appears in the survey findings published in November 2024¹¹ and May 2025¹⁶: whichever brand sold you the tariff, the group that services you is the licensed supplier behind it.

The obligations that follow the licence are substantial. Under the Energy Company Obligation, "ECO places legal obligations on larger energy suppliers to deliver energy efficiency measures to domestic premises"⁹. The licence, not the brand, is what Ofgem regulates, and where a white label brand sits with a licensed supplier, the brand's customers are the licensee's customers in regulatory terms.

For a household, the practical consequence is that the licensed company determines what protection you have:

• If the partner supplier fails, it is that supplier's customers who are transferred under the supplier of last resort process, whatever brand they signed up under.
• Complaints and disputes are handled against the licensed company, not the front brand.
• Support schemes run by suppliers, such as hardship funds and efficiency obligations, are delivered by the licensee.

Our page on energy supplier failures explains what that has meant in practice.

Being open about brand and partner ties: what to check

Because the brand and the licensed company can be different, the name on your bill is the anchor for everything. The Energy Ombudsman's dispute process is built around it: to raise a dispute, "Search for the name of your energy supplier to get started."¹⁷ And the eligibility check is explicit that the supplier name on the dispute must match the company name written on the account holder's bill. The Ombudsman's own listings show the pattern: "British Gas New Heating (cases only for Green Deal sector) matches the company name written on the account holder's bill"¹⁸; "Connekt Energy matches the company name written on the account holder's bill"¹⁹; "London Square (Spitalfields) Management Company Ltd matches the company name written on the account holder's bill"²⁰; and complainants must confirm, for example, "I've checked that Free Energy Help Ltd is the correct supplier to raise my dispute against"²¹.

The Ombudsman also notes limits on what it covers: a case is not eligible "if the consumer has never been a consumer of the supplier, or is complaining about something not covered by the scheme", and the scheme deals with gas and electricity supply disputes, with some ancillary services not covered²².

Two further checks are worth knowing. If your question is about the wires and pipes rather than the supply, the Energy Ombudsman advises: "You can find out who your network provider is via the Energy Networks Association website"²³, because network operators are separate companies from suppliers. And the principle of looking past the front brand extends beyond energy: government guidance on consumer connectable products covers "any person who markets a product manufactured by another person under that person's name or trademark"²⁴, the same brand-owner logic that underpins white label supply. If you are simply trying to identify your supplier in the first place, our guide to finding out who supplies your energy covers the routes.

Supplier profit: what firms make from the nation's bills

Independent analysis published in September 2026 put a figure on what suppliers earn from households. The projected 12 month profits for all energy suppliers "has hit £1.88bn, an increase of £140m from the previous" quarter's projection, an 8% increase, and suppliers "could rack up £1.74bn in profits over the next 12 months from customers' energy bills" before the latest price cap changes, which are "now expected to make an additional £140m in profit on the nation's energy bills over the next 12 months"⁴. Per household, "firms now make an average £64.70 profit per customer per year, up by £4.70 per customer"⁴.

The same analysis looked at costs as well as profits: "energy firms' operating costs are making up £242 (an average of 13%) of customers' bills"⁴. So on a typical bill, a slice considerably larger than the profit goes to running the supplier itself, from billing systems to call centres. We unpack what sits inside a bill in our guide to energy supplier profits and margins.

Ofgem's own work shows the profit line is not always where the watchdog's attention ends. Its review of wholesale costs under the price cap found that "six suppliers (65% market share) experienced an over-recovery with a range of +£10 to +£77 per SVT electricity customer" across cap periods 9a to 10b²⁵. In other words, some large suppliers took in more than expected from customers on standard variable tariffs, within a range of £10 to £77 per electricity customer. Against that backdrop, customer sentiment is broadly stable: around three quarters, 73%, of consumers were satisfied with their energy supplier overall in Ofgem's 2021 survey, though 30% had contacted their supplier in the past three months, and half of dissatisfied customers remained dissatisfied²⁶.

The trade association's role: what Energy UK controls and what it leaves alone

Returning to the trade association with the ownership picture in place: Energy UK's role is representation, not decision-making. The decisions that shape a household's energy relationship are made elsewhere. Ofgem decides who gets a licence and on what terms⁸, sets the rules suppliers must follow as the independent regulator for Great Britain⁷, and runs schemes such as the Great British Insulation Scheme, under which "suppliers can also use their own energy debt data to identify and refer eligible households through Great British Insulation" flexibilities²⁷. The Energy Ombudsman decides disputes, and only for suppliers trading in Britain⁵.

There are also gaps that no body fills. A parliamentary briefing on data governance in the UK energy sector notes "there is no central body that enforces data standards in the sector"²⁸. That matters more as households add smart meters, apps and connected devices, because the data flowing between meters, suppliers and third parties is not overseen by a single enforcer. Our page on energy supplier apps and online accounts looks at what that means day to day.

So when a trade association speaks, it is speaking for its member companies, and its positions are the industry's positions. The levers a household can actually pull are the regulator's rules, the Ombudsman's dispute process¹⁷ and the switch: moving between the licensed suppliers is the one power every household holds directly, and our pillar page on energy suppliers sets out how the market you are switching within is owned and structured.

How ownership affects a household's freedom of choice

Understanding who owns your supplier changes how you read your own dependence on them. The UK is, in the Treasury's words, "a net energy importer with a high dependence on gas and oil"¹⁰. A household buying gas from a supplier owned by a foreign parent group is therefore at the end of a long chain: an international wholesale market, an importing country, a licensed supplier, and often an overseas parent company. The brand on the bill is the last and most visible link.

The structure also determines who catches you when the chain fails. When the Energy Bills Support Scheme needed to reach households without a direct supplier relationship, such as those in park homes or care settings, the government used local authorities in Great Britain "who will help get support to over 900,000 households who don't have the direct relationship" with a supplier, under the Energy Prices Act²⁹. That is a striking number of homes outside the ordinary supplier relationship, and it shows that the supplier is not the only route to support, but it is the main one.

For most households, the supplier relationship also carries the practical help on offer: suppliers can help with "paying off energy debt" and can "review your current payments and debt repayments"³⁰, and under the Great British Insulation Scheme they can use their own debt data to identify and refer eligible households²⁷. The Energy Company Obligation, which places legal obligations on larger suppliers to deliver efficiency measures, reached homes representing just over 9% of homes in Great Britain in the consultation's scope³¹.

The independence lesson is double-edged. Knowing that six groups hold 91% of the market³ tells you the switching market is real but narrow at the top, and that the licensed company behind your brand, not the brand itself, is who you deal with when things go right or wrong. Reducing dependence on that chain means reducing what you need from it: insulation, efficiency and generation at home shrink the bill and the exposure alike, which is the thread we follow in energy suppliers and household energy independence.