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Energy Retail Companies in the UK: 162 Active Firms (2026)
Energy retail companies in the UK sell gas and electricity supply contracts to households, businesses and public-sector customers.
Buying centres tend to sit with finance, procurement, facilities and public-sector estates teams, rather than with plant managers or grid-asset owners. Household propositions are service-led and price-sensitive; commercial and public-sector work is more procurement-led, with tenders, credit checks and consumption forecasting shaping the sale. Engagements are recurring supply relationships, not implementation projects. The operating centre of gravity is therefore billing accuracy, metering coordination, wholesale purchasing and customer contact handling, with revenue resilience depending on churn control and the ability to pass through wholesale-cost volatility without creating service or compliance problems.
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The UK cohort is small in company-count terms: 162 actively trading energy retail companies, with reported headcount of 615 across the cohort. That workforce footprint looks lean for a licensed supply activity, which fits a market where billing platforms, outsourced customer operations and wholesale-procurement arrangements can carry much of the operating load. Scale still matters: a supplier can hold a visible book of domestic, commercial or public-sector contracts without employing many staff, but capital discipline and service handling become harder when wholesale prices move or customer arrears rise.
UK energy retailers operate under OFGEM supply-licence obligations rather than a light-touch retail model. The constraints sit in ordinary operating processes: billing clarity, switching, meter reading, complaints handling, customer credit balances, vulnerable-customer treatment and financial resilience. Domestic suppliers also face price-cap and standing-charge scrutiny, while business suppliers are judged heavily on procurement conduct and contract transparency. Market structure is therefore not just a sales question. A retailer needs access to wholesale purchasing, settlement processes and customer-service capacity before growth in meter points translates into durable revenue.
Supplier formation appears skewed towards specialist operators and supply-management models, while mature scale-up cases remain scarce. That points to a market where new entrants can still find niches in commercial procurement, public-sector contract administration or customer-service quality, but where balance-sheet demands limit how far most can travel. Consolidation tends to follow stress in wholesale markets and customer-service backlogs, not just acquisition appetite. The firms most likely to endure are those that treat billing accuracy, hedging discipline and complaints handling as core operations rather than back-office overhead.
162
Active firms
2026
9
Above £5M turnover
48
New since 2022
recent incorporations
Key facts
About 5% of the trading cohort reports turnover above £5M (9 of 162 firms) — the rest sits below that revenue band.
29% of the cohort was incorporated since 2022 (48 firms), so a sizeable share is in its first few filing cycles.
Energy retail suppliers sell gas and electricity contracts to household, business and public-sector customers.
Suppliers sit at the point where wholesale energy costs, tariff design and customer service meet end users.
Public-sector and business supply contracts make this market broader than domestic household switching alone.
Turnover alone is a weak comparator for suppliers because commercial scale and operating footprint do not always move together.
Top UK Energy Retail companies
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsSupplies renewable electricity and certified renewable gas to residential and business customers. Offers fixed and variable energy tariffs, including EV and smart‑home plans, and provides account…
Serves UK households seeking green energy tariffs, including EV owners, smart-home users and families, alongside business and non-domestic customers such as construction and property developers.
Financial Health
StableStable · Hiring · 6% CAGR over 3y
Location
EDF Energy
Supplies electricity and gas to residential and business customers. Offers energy tariffs, billing and account services, and installs energy technologies including solar panels, heat pumps, electric…
Serves UK households and businesses seeking electricity and gas tariffs, plus related low-carbon energy products such as solar, heat pumps, EV charging, boilers, insulation and smart meters.
Location
Trajectory
4y · 2019–NowFinancial sub-scores
Computed from 4 filingsSupplies renewable electricity and gas to residential and business customers in the UK. Develops and invests in renewable energy generation projects and green gas production, and offers energy…
Serves UK households and businesses seeking renewable energy tariffs, including environmentally minded homeowners, small businesses and organisations, plus solar panel owners looking to export energy.
Financial Health
StableStable
Location
Supplies electricity and gas to residential and business customers and offers smart energy tariffs. Provides services related to low‑carbon technologies including heat pumps, solar panels, home…
Serves UK household energy consumers, including homeowners and renters, with specific propositions for electric vehicle drivers and homes with heat pumps, solar panels or batteries.
Location
Supplies gas and electricity to households and businesses, offering fixed and variable energy tariffs. Provides energy-related products and services including smart meters, EV charging plans, solar…
Serves residential energy customers, especially households switching gas or electricity providers and those with boilers, EVs, heat pumps, smart meters or solar panels.
Location
MONGOOSE ENERGY SUPPLY LIMITED
Trajectory
3y · 2019–NowFinancial sub-scores
Computed from 3 filingsSupplies gas and electricity to businesses, offering fixed and flexible energy contracts, procurement services, renewable energy options, smart metering, and support for new connections, multi-site…
Serves UK businesses from small firms to medium, large and multi-site organisations, plus energy consultants, third-party intermediaries and affiliate partners managing commercial energy needs.
Financial Health
StableStable
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies renewable electricity and gas to households and businesses; develops and invests in wind, solar and green gas generation projects; offers energy tariffs, smart meters, and schemes enabling…
Serves households and businesses in Britain that want green energy tariffs, including customers with solar panels, smart meters or home battery storage.
Financial Health
StableStable
Location
Yü Energy Holding Limited
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsSupplies electricity, gas and water to businesses, offering fixed and flexible energy tariffs, renewable electricity and carbon‑neutral gas options. Provides smart meter installation, energy…
Serves micro, small and large businesses, public sector organisations, energy brokers and commercial development projects seeking business utilities and new connections.
Financial Health
DistressedDistressed
Location
Trajectory
1y · 2021–NowSupplies renewable electricity and gas to residential and business customers. Develops and invests in renewable energy generation including wind and solar, and operates schemes that allow small‑scale…
Serves environmentally minded households and businesses across Britain, including homes with solar panels or battery storage, looking for a green energy supplier.
Financial Health
Insufficient historyInsufficient history
Location
DYCE UTILITIES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies electricity and gas to business customers, offering fixed-term tariffs, renewable electricity and carbon-neutral gas options. Provides energy contract management for SMEs and multi-site…
Serves UK businesses needing energy supply, including SMEs, large accounts and multi-site organisations seeking electricity, gas, renewable electricity or carbon-neutral gas contracts.
Financial Health
StableStable · -35% CAGR over 5y
Location
FUSE ENERGY SUPPLY LIMITED
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsSupplies gas and electricity to residential and business customers, offering fixed, variable and multi‑rate tariffs. Provides EV charging tariffs and charger installation, online account management,…
Serves UK households, EV owners, homeowners with solar or battery systems, landlords and multi-property customers, plus businesses seeking gas and electricity tariffs and energy account management.
Financial Health
StrongStrong
Location
D-ENERGI TRADING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsSupplies electricity and gas to business customers, including tariffs sourced from UK wind farms and other renewable sources. Provides business energy contracts, half‑hourly electricity supply, smart…
Serves UK business energy customers, including care homes, education providers, manufacturers, hospitality businesses and charities seeking electricity, gas, half-hourly supply or renewable tariffs.
Financial Health
StableStable · -93% CAGR over 2y
Location
UNITED GAS & POWER TRADING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies gas and electricity to commercial customers, offering fixed and flexible energy contracts, renewable energy options, and energy procurement services. Provides meter installation, new…
Serves small, medium, large and multi-site UK businesses, plus third-party consultants and affiliate partners involved in commercial energy purchasing, account management, siteworks or new…
Financial Health
StableStable
Location
D-ENERGI LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsSupplies gas and electricity to commercial customers, offering fixed and variable business energy tariffs, half‑hourly electricity contracts and 100% UK wind power options. Provides energy switching,…
Serves small, medium and large UK businesses, including care homes, education providers, manufacturers, hospitality operators, charities, and single- or multi-site organisations.
Financial Health
StableStable
Location
OCTOPUS (UK) LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsSupplies electricity and gas to households and businesses, offering variable and smart energy tariffs. Provides installation and financing for low‑carbon technologies including heat pumps, solar…
Targets B2C customers across the UK: households, homeowners and renters, including consumers with electric vehicles, heat pumps, solar panels or home batteries seeking domestic energy tariffs.
Financial Health
StableStable · Hiring · 8% CAGR over 4y
Location
Supplies electricity and natural gas to residential and business customers. Offers energy tariffs, smart meters and energy management services, and installs low‑carbon technologies including solar…
Serves UK households and businesses, including homeowners, tenants and commercial energy buyers looking for domestic or business electricity, gas and low-carbon energy options.
Location
Supplies electricity and gas to households and businesses and offers energy-related products and services, including smart tariffs, electric vehicle charging tariffs, heat pump installation, and…
Sells to UK household energy customers, including homeowners and renters, plus households with electric vehicles, heat pumps, solar panels or home batteries.
Location
Supplies electricity and gas to residential customers and offers energy tariffs including smart and time‑of‑use plans. Also provides installation and financing of low‑carbon technologies such as heat…
Sells primarily to UK households managing home energy use, including homeowners with electric vehicles, solar panels, batteries or heat pumps, and domestic customers seeking electricity and gas…
Location
Unify Energy Partners Limited
Trajectory
1y · 2025–NowSupplies electricity and gas to commercial properties, working with landlords, managing agents, and businesses. Provides energy supply contracts, renewable electricity options, smart meter…
Serves UK landlords, managing agents and commercial property occupiers, from single-building businesses to large portfolio owners and multi-tenant property operators needing energy arrangements for…
Financial Health
Insufficient historyInsufficient history
Location
Provides electricity and gas supply to residential and business customers, offering energy tariffs, smart meters and usage programmes. Also sells and installs low‑carbon technologies including solar…
Serves UK households and businesses, including existing energy account holders and customers considering fixed tariffs, smart tariffs, electric vehicles, solar, heat pumps, boilers, insulation and…
Location
Supplies electricity and gas to residential and business customers. Offers energy tariffs, billing and account services, and provides installation of low‑carbon technologies such as solar panels,…
Serves UK households and businesses, including domestic energy users and commercial customers seeking electricity and gas supply, tariffs, smart meters, EV charging, solar, heating and insulation…
Location
The OVO Charitable Foundation
Supplies gas and electricity to households, offering fixed and variable energy tariffs. Provides smart meters, EV charging services, solar panels and battery storage, heat pumps, boiler installation…
Sells primarily to UK households and individual energy consumers switching gas and electricity suppliers, plus homeowners buying home energy products and cover. Also serves EV drivers, solar…
Location
Supplies electricity and gas to residential customers and offers energy tariffs including smart and time‑of‑use plans. Also provides installation and financing for low‑carbon technologies such as…
Serves UK households, including homeowners and renters, seeking domestic energy tariffs and savings for homes, electric vehicles, heat pumps, solar panels and batteries.
Location
Ecotricity
Supplies renewable electricity and gas to residential and business customers. Develops and invests in renewable energy generation including wind and green gas projects, and provides services for…
Serves environmentally minded households and businesses across Britain seeking renewable electricity and gas tariffs, including customers with solar panels or smart meters.
Location
Supplies renewable electricity and gas to household and business customers and develops green energy generation projects, including wind power and sustainable gas production, investing customer…
Serves UK households and businesses seeking renewable energy tariffs, including home energy users, business energy buyers, solar panel owners exporting power, and customers wanting greener gas and…
Location
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsSupplies renewable electricity and gas to residential and business customers. Develops and invests in renewable energy generation and green gas production, and offers tariffs, smart meter support,…
Serves UK households and businesses seeking renewable electricity, greener gas and lower-carbon energy options, including consumers with solar panels, smart meters or home battery storage.
Financial Health
StableStable
Location
KINGSWOOD ENERGY LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies electricity and gas to residential customers and offers energy tariffs, including smart tariffs for electric vehicles and home batteries. Also provides installation of low‑carbon…
Sells to UK households and individual consumers buying energy supply, including homeowners interested in heat pumps, solar and battery systems, electric vehicle charging, and smart home energy…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Utilita Energy
Provides pay-as-you-go gas and electricity supply to residential and business customers, with smart meter-based energy management via a mobile app. Also offers solar panel and battery storage…
Serves UK households, especially pay-as-you-go gas and electricity customers and homeowners considering solar, alongside businesses seeking energy supply or on-site solar options.
Location
Supplies renewable electricity and gas to domestic and business customers. Develops and invests in green energy generation projects, including wind, solar and green gas, and offers energy tariffs,…
Serves UK households and businesses seeking green electricity and gas tariffs, including customers with solar panels or home battery storage who want to manage or export energy.
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies renewable electricity and gas to residential and business customers, sourcing power from wind and other renewable generation and investing revenue into developing new green energy projects,…
Sells to UK households and businesses seeking renewable electricity and greener gas. Also serves home energy customers with solar panels, smart meters or home battery storage looking to manage or…
Financial Health
StableStable
Location
Supplies renewable electricity and green gas to residential and business customers. Develops and invests in wind, solar and green gas generation, and offers energy tariffs, smart meter services, and…
Serves environmentally minded households and businesses across Britain, including homeowners, tenants and business energy buyers seeking renewable energy suppliers.
Location
Good Energy
Supplies 100% renewable electricity tariffs to households and businesses, and provides home energy technologies including solar panel and battery systems, heat pumps, and electric vehicle chargers,…
Serves UK households, homeowners and EV drivers seeking renewable energy tariffs and home energy upgrades, plus businesses looking to reduce their energy emissions.
Location
Tiers Cross Solar
Supplies renewable electricity tariffs and provides home energy technologies including solar panel and battery systems, heat pumps and EV charger installations. Also offers export tariffs and…
Serves UK households and homeowners, including EV drivers and solar export customers, alongside businesses seeking greener energy options.
Location
Provides electricity and gas supply services to residential and commercial customers, offering energy tariffs, billing and account management, and related energy solutions including solar panels,…
Serves UK households and businesses, including homeowners, renters, EV owners and organisations comparing energy tariffs or switching supplier, plus customers interested in low-carbon home energy…
Location
CROWN GAS & POWER (SITEWORKS) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies gas and electricity to commercial customers. Offers renewable gas options such as biomethane, energy management and switching support for consultants, and utility connection services…
Serves UK commercial energy customers, including SMEs and larger businesses, plus energy consultants managing business clients that need gas, electricity or utility connection services.
Financial Health
StableStable · -68% CAGR over 4y
Location
MARBLE HOLDINGS UK LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies gas and electricity to commercial customers, offering fixed and flexible business energy contracts. Provides energy supply, switching support and account management services for companies…
Serves UK businesses that buy gas and electricity for commercial premises, targeting companies seeking fixed or flexible energy supply contracts, switching support and dedicated customer service.
Financial Health
StableStable · -77% CAGR over 5y
Location
Leicester District Energy
Provides energy supply and management services, including electricity and gas supply, renewable energy generation, biomethane production, and energy storage. Also offers power purchase agreements,…
Serves UK businesses buying electricity and gas, renewable energy generators seeking purchase agreements, owners of flexible energy assets, and landowners, farmstock partners, universities and…
Location
Supplies gas and electricity to residential customers and offers energy tariffs, smart meters, EV charging plans, solar panel and battery systems, and home heating services including boilers, heat…
Serves UK domestic energy customers, including households switching gas and electricity tariffs, homeowners needing boiler/heating cover or solar, and EV drivers seeking home and public charging…
Location
Supplies gas and electricity to residential customers and offers energy tariffs and switching services. Provides smart meters, EV charging tariffs and chargers, solar panels and battery storage, heat…
Serves primarily UK household consumers, including homeowners, renters, EV drivers, and customers seeking home energy, heating cover, solar, battery storage, and smart energy services, with limited…
Location
Supplies electricity and gas to business customers and develops, owns and operates renewable energy assets including solar, wind and biomethane plants. Provides power purchase agreements, energy…
Serves UK businesses and energy-sector partners, including corporate electricity and gas customers, renewable power generators, energy asset owners, landowners, farmstock partners, and universities…
Location
ENERGY OFFICE LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides power purchase agreements and feed-in tariff services, buying exported renewable electricity from generators and selling renewable power to business customers, including electricity supply…
Serves UK businesses seeking renewable electricity and renewable power generators, such as PV solar and hydro site owners, looking to sell exported electricity; also works with brokers and energy…
Financial Health
StableStable
Location
Supplies electricity and gas to businesses and develops and operates renewable energy assets including onshore and offshore wind, solar and biomethane plants. Provides energy management, power…
Serves UK business energy customers, renewable generators and asset owners, including organisations buying electricity or gas, companies seeking PPAs, and landowners, farmers and joint-venture…
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies renewable electricity tariffs and provides home energy technologies including solar panel and battery systems, heat pump installations, and electric vehicle charger installations, along with…
Serves UK households, homeowners, EV drivers and businesses seeking renewable energy tariffs, low-carbon home upgrades and export options for solar generation.
Financial Health
StableStable · 0% CAGR over 4y
Location
GOOD ENERGY PR LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies 100% renewable electricity tariffs to households and businesses. Installs and supports home energy technologies including solar panels, battery storage systems, heat pumps and electric…
Serves UK households, homeowners and EV drivers, alongside businesses seeking renewable energy tariffs and greener home or workplace energy technologies.
Financial Health
StableStable · -68% CAGR over 4y
Location
Merchant Wind Park (east Kilbride)
Develops and operates renewable energy generation projects, particularly wind farms, producing electricity for supply to the grid as part of a green energy supplier that provides renewable…
Sells to UK households and businesses seeking renewable energy, including home energy customers, business energy buyers, solar panel owners exporting power, and consumers motivated by sustainability…
Location
Operates a group of sustainability-focused businesses across energy, telecoms, manufacturing, food and sport. Activities include supplying renewable electricity and gas, producing wind turbines,…
Serves environmentally conscious consumers, SMEs and organisations in sectors including energy, telecoms, food, sport, jewellery, sustainability accreditation, renewable generation and carbon…
Location
Supplies electricity and gas to residential and business customers in the UK. Offers energy tariffs, smart meters, and energy services including solar panel, heat pump, insulation, boiler, and…
Serves UK households and businesses seeking electricity and gas supply, including customers interested in smart tariffs, electric vehicles, solar, heat pumps, boilers, insulation and smart meters.
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies renewable electricity to businesses, sourcing power from local generators including wind, solar, wave and waste. Offers fixed and flexible tariffs, energy traceability, billing, and manages…
Serves Northern Ireland businesses seeking renewable electricity, and engages local renewable power generators looking for fixed-price arrangements and managed export support.
Financial Health
StableStable
Location
Supplies electricity and renewable energy to business customers and offers fixed and flexible energy contracts. Purchases power from renewable generators through power purchase agreements and…
Serves UK large and small businesses procuring energy, plus renewable generators, CfD asset owners and corporate partners needing routes to market, PPAs, trading/origination support and environmental…
Location
Engie UK
Supplies electricity and gas to businesses and provides energy management and market access services. Develops and operates renewable energy, biomethane and energy storage assets, and offers power…
Serves UK businesses buying electricity, gas and energy management, plus renewable power and biomethane producers, asset owners, landowners and joint venture partners.
Location
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How UK Energy Retail companies work and how to sell to them
What they do
Energy retailers earn revenue by selling electricity, gas or multi-utility supply contracts, usually through recurring customer accounts rather than one-off projects. Domestic books depend on unit charges, standing charges and retention, while commercial and public-sector contracts often involve fixed-term pricing, pass-through elements, credit assessment and consumption forecasts. Some operators act more as supply-management businesses, coordinating procurement, billing and service delivery without owning generation assets. The economic model is administrative as much as commercial: small errors in meter data, tariff setup or settlement can erode margin and create complaints.
Who they sell to
Most energy retailers sell to a mix of households, small businesses, multi-site commercial customers and public-sector estates. Domestic acquisition is typically direct, comparison-led or renewal-led, with price and service reputation carrying much of the decision. Business supply tends to involve finance directors, procurement managers, facilities leads and energy managers, with brokers and tender processes often sitting between supplier and customer. Public-sector work is more formal, with framework-style procurement, credit checks and contract transparency expectations. Sales cycles are usually shorter for simple switches and longer where consumption forecasting, consolidated billing or site-level validation is needed.
What they buy
Most energy retail firms tend to spend on billing systems, meter-data handling, customer contact tooling, payments, collections and regulatory reporting. Forecasting and wholesale-risk support matter where suppliers manage their own procurement exposure, while customer operations teams often need complaint management, call-routing, knowledge-base and workforce-planning tools. Finance teams may buy credit-risk checks, cashflow forecasting, accounting support and audit services. Security, data protection and identity controls also matter because suppliers handle household and business account information at scale. Recruitment spend usually clusters around operations, compliance, finance, procurement and customer-service roles rather than plant engineering.
Why and how to sell to them
Energy retail buyers tend to evaluate vendors when churn rises, billing errors create complaint backlogs, arrears increase, a new customer book is added, or a procurement model moves from domestic supply into commercial or public-sector work. Leadership changes, licence scrutiny and outsourced-service reviews can also open buying windows. Outbound angles work better when they attach to measurable operating leakage: fewer rebills, faster dispute resolution, cleaner meter reads, lower contact rates, shorter cash-collection cycles or clearer evidence for OFGEM-facing processes. Generic efficiency claims are less persuasive than showing how the offer reduces operational risk inside a regulated supply workflow.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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