Independent directory of the major UK business gas and electricity suppliers. Open any supplier for ownership, financials, value-added services, pros and cons, and their own published out-of-contract rates with a link straight through to the supplier's rate page.
We cite the Citizens Advice non-domestic supplier league for Q4 2025. Lower scores are better, the score reflects complaints per ten thousand customers weighted by severity. Source: citizensadvice.org.uk.
The major UK business energy suppliers
Founded date, current chief executive, headquarters, latest published revenue, complaints ranking, value-added services, and three things each supplier is genuinely good at.
Shell plc's UK B2B energy arm. Commercial-only supply across SME, mid-market and Industrial & Commercial, with a heavy I&C and large-corporate footprint.
French utility ENGIE's UK B2B arm. Focused on Industrial & Commercial supply, energy services and corporate Power Purchase Agreements, with a long-standing position serving large multi-site customers.
Independent power producer with a B2B-only electricity retail arm. Supplies half-hourly (Profile Class 0) sites only, with on-site generation and corporate PPAs backed by its own 983MW pipeline.
IPP-backed supplier with 983MW operational and in-construction across battery, solar, peaking gas and synchronous condensers; gives physical hedging capability that pure retailers lack.
Half-hourly only focus from October 2025 means a dedicated I&C operating model rather than a mass-market retention book.
Match+ product offers half-hourly REGO matching for clients with serious sustainability reporting requirements.
Conrad Energy out-of-contract rates 2026
Effective 2026-04-01, transcribed from Conrad Energy's own published rate documents.
Electricity
29.15p/kWh·122p/day
Day rate 7am-midnight (Non-Domestic Aggregated, No Residual band). Night rate midnight-7am is 24.23 p/kWh.
This is a public market reference, not a list of suppliers Purely Energy holds contracts with. Our quoting process runs your consumption profile against the wider UK market, including challenger suppliers that the largest brokers often skip.
Full UK business energy supplier directory
Every UK non-domestic gas and electricity licensee on the Ofgem register, normalised under the trading name your business will actually see on a contract. 120 entities, searchable by trading name, licence holder, parent or company number. 14 of these are covered in depth in the directory above and route there automatically, leaving 106 long-tail suppliers with their own lighter profile page.
Each profile shows the trading name, every Ofgem licence held under that name, contact details and rate-availability status. Where the licence holder is a UK limited company we also publish live business intelligence drawn from Purely Energy's independent research on each supplier: incorporation date and years trading, current ultimate owner, employee headcount, the latest five filed years of turnover, profit and balance-sheet position, and credit risk band. That gives you a single page to assess whether a supplier is large, growing, financially sound and worth inviting into a tender, before you ever pick up the phone.
Licence-holder data is taken from the Ofgem all-licensees register and re-checked against Companies House and the supplier's own website. The two source registers are published and maintained by Ofgem, the Office of Gas and Electricity Markets:
Trading names, contact details and out-of-contract rate information change frequently. Always verify on the supplier's own website before relying on a number, rate or renewal date.
Who is the biggest UK electricity supplier?
Two league tables built from Elexon's settlement data: the largest domestic suppliers (households) and the largest commercial suppliers (the non-domestic market Purely serves). Ranked by electricity meter points for 2025 Q1, refreshed automatically each quarter as Elexon publishes.
Largest commercial electricity suppliers
Non-domestic (business and I&C) supply, by meter points.
By electricity import meter points, 2025 Q1. Source: Elexon BSC Number of Metering Systems.
Non-domestic = all half-hourly sites plus Profile Class 3 to 8 non-half-hourly meters (the businesses Purely serves). Ranked by meter points (customer sites), not revenue or official market value. Share is of the named suppliers shown; Elexon's sub-threshold “Other Supplier” aggregate is excluded.
Largest domestic electricity suppliers
Household supply, by meter points.
By electricity import meter points, 2025 Q1. Source: Elexon BSC Number of Metering Systems.
Domestic = Profile Class 1 and 2 non-half-hourly plus domestic unmetered supply. Ranked by meter points (customer sites), not revenue or official market value. Share is of the named suppliers shown; Elexon's sub-threshold “Other Supplier” aggregate is excluded.
Who is the biggest UK gas supplier?
Gas is not as open as electricity. Electricity supplier volumes are published quarterly by Elexon (the league tables above), but named-supplier gas market share sits with Xoserve, the gas market's central data body, behind a Data Services Contract, so there is no public business-gas league table to rank. We will not invent one.
What the public data does show
Domestic gas: Ofgem publishes named-supplier domestic market share. British Gas has long been the largest domestic gas supplier. See Ofgem's retail market indicators.
Business gas: no free named-supplier dataset exists. The major suppliers by business gas are the same large players you see in the electricity tables (British Gas, Corona Energy, SEFE, Crown Gas & Power, TotalEnergies), but a ranked share is not publicly published.
Live system: National Gas publishes where gas physically enters the network in real time, shown opposite.
Where gas is physically entering the National Transmission System right now, by entry point. Wholesale system data, not supplier share.
Live
UK supplier electricity market share
Compare suppliers by their non-domestic (B2B) import meters, export meters, and average MWh per meter for FY24/25, sourced from Elexon's quarterly Energy Volumes and Number of Metering Systems datasets. Domestic-only volumes are filtered out so the picture matches what a business buyer actually sees in the market.
Out-of-contract vs fixed-rate, run the numbers
Sites that roll past their contract end date drop onto deemed or out-of-contract rates, which can sit well above current fixed offers. Enter your actual rate to see the difference.
Out-of-contract vs fixed-rate savings
Enter your current out-of-contract rate (from your bill or the supplier's deemed rates page) and a fixed-rate scenario to compare. We do not invent supplier rates, you enter the figures you have.
Out-of-contract annual
£14,310
Fixed-rate annual
£9,764
Annual saving
£4,546
32% lower
Want a real fixed-rate quote against your meter? It takes about two minutes.
Send us your usage and we will run the wider UK market against your meter, then come back with the best fit. Every quote shows the wholesale price, non-commodity costs, supplier margin and our margin separately.
