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Energy Retail Companies in London: 39 Active Firms (2026)
Energy retail companies in London sell electricity, gas or related supply services to households and businesses across the capital.
Buying responsibility usually sits with household acquisition teams, SME account managers, commercial-estates buyers and public-sector procurement desks, rather than with generation or infrastructure functions. The operating centre is tariff administration, metering, billing, switching support and customer service. Contracts range from individual household dual-fuel tariffs to managed supply for small businesses, commercial premises and civic estates, with engagement scale shaped more by account volume and service expectations than by bespoke project work. London-based firms in this cohort appear specialist: retail supply is the core model, while generation, installation and wholesale trading sit outside the centre of gravity.
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London has 39 actively trading energy retail companies, making this a narrow specialist market rather than a broad utilities universe. Reported employment totals 150 people, which fits the pattern of lean operating teams focused on customer accounts, billing, metering and support. None report turnover above £5M, so revenue scale appears limited even among active suppliers. The incorporation profile also has a recent-company tilt: 13 firms were incorporated since 2022, suggesting churn, experimentation and new tariff-led models within a small London base.
Retail energy supply sits inside a rules-based market, and the compliance burden is close to day-to-day operations. Tariff presentation, billing accuracy, switching communications, metering processes and complaint handling all affect whether a supplier can serve households and business customers without operational drag. Commercial and public-sector customers add procurement documentation, account reporting and continuity expectations. Household-facing suppliers carry a different risk profile, with affordability, support quality and billing clarity more exposed to scrutiny than in wholesale or installation-led energy businesses.
Further development appears constrained by the same features that make the cohort specialist: regulation, working-capital exposure, customer-service cost and thin operating teams. New entrants may still appear around niche tariffs, account management or metering-adjacent services, but pure retail supply tends to reward process discipline more than marketing claims. Scale-up scarcity is likely to keep consolidation on the table, especially where smaller suppliers struggle to maintain billing accuracy and customer support. Segment focus should matter: household affordability, small-business service, and public-sector procurement fit each point to different operating models.
39
Active firms
2026
13
Incorporated since 2022
Newer companies
0
Above £5M
Reported revenue
Key facts
33% of the cohort was incorporated since 2022 (13 firms), so a sizeable share is in its first few filing cycles.
Energy retail is the customer-facing layer of the energy system, where pricing, switching, billing and service quality show up before they appear in wider market commentary.
London’s role appears more commercial than operational, centred on finance, sales, regulation-facing work and business energy services.
Retail suppliers sit between generators, wholesale markets, network operators and end users, so wholesale pressure tends to reach billing and customer service teams early.
Brokerage-style operators and service-led businesses sit alongside licensed suppliers, giving the London market a commercial services tilt.
Top London energy retail companies
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsOperates an electricity supply platform for large industrial and commercial customers, enabling businesses to purchase power from independent generators. Provides energy supply services, power…
Serves large industrial and commercial energy buyers, including EV charging and fleet transport, food manufacturing, cold chain, hospitality, food retail, supermarkets and tier 1 retailers, plus…
Financial Health
DistressedDistressed · -73% CAGR over 3y
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 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
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 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
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
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
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
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
Trajectory
3y · 2019–NowFinancial sub-scores
Computed from 3 filingsSupplies 100% renewable electricity tariffs to households and businesses. Installs solar panel and battery storage systems, heat pumps, and electric vehicle chargers, and offers export tariffs and…
Serves UK households, homeowners and EV drivers seeking renewable home energy options, plus businesses looking to make their operations greener and customers exporting power.
Financial Health
StableStable · 0% CAGR over 2y
Location
Supplies electricity and gas to business customers and provides energy management and market access services. Develops and operates renewable energy, biomethane and energy storage assets, and…
Serves UK business energy customers, renewable generators, energy asset owners, biomethane producers, landowners, farmstock partners and joint venture partners seeking energy supply, market access or…
Location
Excel District Energy
Supplies electricity and gas to business customers and provides energy management and market access services. Develops and operates renewable energy, biomethane and energy storage assets, and…
Serves UK businesses needing energy supply and management, plus renewable generators, energy asset owners, biomethane producers, landowners, farm partners, universities and innovators involved in…
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
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
Southampton Geothermal Heating (THE)
Supplies electricity and gas to businesses and develops low‑carbon energy infrastructure, including renewable power generation, biomethane plants, and energy storage. Provides energy management,…
Serves UK businesses and energy asset owners, plus landowners, farmstock partners, universities and joint-venture partners involved in renewable energy, biomethane, storage and energy procurement.
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
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
Coventry District Energy
Provides business energy supply and energy management services, including electricity and gas supply, power purchase agreements, and market access for energy assets. Develops and operates renewable…
Serves UK businesses and energy-sector partners, including commercial energy buyers, renewable generators, asset owners, landowners, farmstock suppliers, universities and joint venture partners.
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
Birmingham District Energy
Provides energy supply and energy management services, including electricity and gas supply, power purchase agreements, and market access for energy assets. Develops and operates renewable generation…
Serves businesses and organisations buying energy supply, management and infrastructure services, plus generators and asset owners seeking market access or purchase agreements. Also targets…
Location
Develops and operates biomethane plants and renewable energy assets, and supplies electricity and gas to businesses. Provides energy management, power purchase agreements, asset optimisation, and…
Serves UK businesses buying electricity and gas, corporate energy users seeking renewable supply, and owners/operators of energy assets. Also targets landowners, farmstock partners, joint-venture…
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
East London Energy
Generates heating and hot water using centralised energy centres and distributes it through district energy networks. Supplies residential and commercial properties connected to its schemes, using…
Serves residential households and commercial properties connected to district energy schemes in the Queen Elizabeth Olympic Park and surrounding East London areas.
Location
Supplies electricity and gas to business customers and provides energy management and market access services. Develops and operates renewable energy, biomethane and energy storage assets, and…
Serves UK businesses buying electricity and gas, corporate energy buyers, renewable generators, energy asset owners, biomethane producers, landowners, farmstock partners, and universities or…
Location
Regenerate Newcastle Supply
Supplies electricity and gas to business customers and develops energy infrastructure including renewable generation, biomethane plants, and energy storage. Provides energy management, demand…
Sells to UK businesses and organisations buying energy supply, management and purchase agreements, including large energy users, asset owners, generators, landowners, farmstock partners, and…
Location
Feeding Your Energy Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsServes UK households and business energy buyers seeking electricity and gas supply, including customers interested in tariffs, smart meters, EVs, solar, heat pumps, boilers and insulation.
Financial Health
StrongStrong
Location
Generates electricity from renewable and thermal sources including offshore and onshore wind, hydro, solar and gas. Develops and operates electricity transmission and distribution networks, and…
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsTargets prospective energy customers and early adopters interested in joining a forthcoming energy platform, via a founding member invitation list.
Financial Health
WeakWeak · 150% CAGR over 1y
Location
VIOS ENERGY LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops and operates sustainable electricity projects, including hydro power generation, electricity trading, and solar PV installation and maintenance. Also provides electric vehicle charging…
Serves a mix of B2C residential communities, B2B businesses, and mobility-sector customers, plus organisations seeking renewable energy partnerships.
Financial Health
HealthyHealthy · 0% CAGR over 1y
Location
SV Fuels Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies liquefied petroleum gas (LPG) and liquefied natural gas (LNG) and related energy products for residential, commercial and industrial use. Provides fuel distribution, supply and risk…
Serves business and residential energy customers worldwide, including industrial, transport and agribusiness users, as well as households needing decentralised energy supplies.
Financial Health
StrongStrong · Growing · 0% CAGR over 5y
Location
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How London energy retail companies work and how to sell to them
What they do
Energy retailers earn revenue by supplying electricity, gas or dual-fuel accounts under tariff contracts, with income tied to standing charges, consumption and account fees rather than project delivery. London suppliers in this segment tend to sell a managed account service around billing, meter administration, switching support, payment collection and customer communications. Household offers are usually standardised, while SME, commercial-premises and civic-estate arrangements may include account management, reporting and contract renewal support. Gross margin depends on tariff design, hedging discipline, bad-debt control and the cost of serving each account.
Who they sell to
Most household revenue comes through direct switching journeys, retention teams and price-comparison style acquisition, where the buyer is an individual bill payer and the decision is price-led. Business supply is more varied: owner-managers, finance directors, facilities managers, property teams and procurement officers typically weigh tariff certainty, billing accuracy, credit terms and support quality. Smaller business accounts can close through direct sales or broker-led introductions, while commercial estates and public-sector buyers tend to use tender documents, framework-style procurement and formal contract review. Buying committees are usually operational as much as financial.
What they buy
Spending tends to cluster around customer operations, billing control and regulated-workflow management. Energy retailers are plausible buyers for billing and payment systems, customer service tooling, CRM, collections, complaint handling, meter-data management, cyber security, identity checks and analytics for tariff performance, churn and debt risk. Lean London teams may also use outsourced contact-centre capacity, finance operations support, legal advice, compliance documentation, cloud hosting and recruitment for customer operations or account-management roles. Sellers should expect scrutiny on integration with existing billing processes, audit trails, permissioning and how quickly the service reduces manual work without disrupting live customer accounts.
Why and how to sell to them
Commercial intent often appears when suppliers add new tariffs, move into business or public-sector accounts, replace manual billing work, or face rising complaint volumes and debt exposure. Leadership changes, new operations hires and account-management recruitment can also signal a willingness to revisit systems and services. Outbound messages tend to land better when they connect to measurable operating frictions: fewer billing exceptions, faster query resolution, clearer audit trails, lower service cost per account, or cleaner procurement packs for larger buyers. Claims about growth alone are less useful; energy retail buyers usually need proof that change will not create customer-service or compliance risk.
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.
Also in London
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