Cleantech Companies in London: 396 Active Firms (2026)
Cleantech companies in London develop low-carbon technologies, energy-efficiency services and resource-management solutions for urban markets.
Buying centres tend to sit with sustainability teams, energy managers, estates directors, infrastructure owners and public-sector procurement leads, rather than a single software budget holder. London suppliers in this area sell into commercial property, industrial sites, local authorities and urban infrastructure projects, with a mix of engineered systems, data tools, efficiency services and delivery capability. Engagements usually start as feasibility work, site-level pilots or compliance-led assessments, then move towards estate roll-outs, managed services or project-delivery contracts when the economics can be evidenced.
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London has 396 actively trading cleantech companies, a cohort that sits between specialist engineering consultancies, software-led emissions tools, project developers and resource-management operators. The reported employment footprint is 982 employees, so the market is not just a shell-company population; it includes operating teams with delivery capacity. Scale is uneven, however: 46 firms have turnover above £5M, while 82 were incorporated since 2022, leaving a visible early-commercial layer alongside a smaller revenue-generating group.
Energy-facing and built-environment suppliers face a regulation stack that is activity-specific rather than sector-wide. A heat-network operator, a building-efficiency adviser and a recycling-infrastructure provider sit under different licensing, planning, procurement and reporting regimes, even when each is labelled cleantech. London also gives the sector a particular market structure: dense commercial property, public-sector estate management and urban infrastructure procurement create demand for proof of savings, delivery risk transfer and contract evidence before buyers move beyond trials.
Commercial traction appears to favour suppliers that can connect decarbonisation claims to operating budgets, compliance requirements or costed asset plans. Hardware-heavy businesses may remain slower to scale than software-led monitoring and optimisation providers, because procurement, installation and service obligations lengthen the sales cycle. Consolidation also seems plausible where fragmented specialists serve similar property, energy and resource-management buyers. The cohort’s early-commercial layer suggests continued experimentation, but buyers are likely to keep rewarding evidence of delivered savings over broad climate positioning.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
396
Active firms
2026
46
Over £5M
Disclosed revenue threshold
82
Since 2022
New incorporations
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Key facts
About 11% of the trading cohort reports turnover above £5M (46 of 396 firms) — the rest sits below that revenue band.
20% of the cohort was incorporated since 2022 (82 firms), so a sizeable share is in its first few filing cycles.
London cleantech firms sell into property, transport, finance and public-sector buying centres, so procurement routes vary by end market.
The category spans buildings, infrastructure, energy management and resource-efficiency work rather than a single operating model.
Buyer qualification is usually clearer when split by delivery model: service-led operators, project businesses and technology vendors.
Top London Cleantech companies
Financial sub-scores
Computed from 5 filingsDevelops carbon capture, utilisation and storage technologies for industrial emitters. Provides mineralisation and chemical processing systems that capture CO2, convert it into cement substitutes or…
Serves B2B customers in CO2-intensive, hard-to-abate sectors, including maritime, energy, heavy industry, cement plants and shipyards seeking decarbonisation partnerships.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
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Computed from 4 filingsDevelops carbon capture technology for industrial point sources, including modular capture systems and chemical solvents. Designs, builds and operates equipment that captures CO2 emissions from heavy…
Serves B2B industrial companies in hard-to-abate sectors, especially operators of space-constrained heavy industrial sites seeking to meet net zero or emissions reduction targets.
Financial Health
StableStable · 0% CAGR over 3y
Location
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Computed from 3 filingsProvides energy efficiency consultancy and building optimisation technology for real estate. Uses digital twin modelling, data monitoring and automated controls to analyse building performance,…
Serves B2B real estate owners, asset managers and portfolio operators seeking to decarbonise and improve energy performance across commercial buildings and property portfolios.
Financial Health
HealthyHealthy · Hiring · 34% CAGR over 2y
Location
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Computed from 3 filingsDevelops, builds and operates renewable energy and battery storage projects. Designs grid flexibility solutions and manages project development, financing, construction and operation of energy…
Serves energy infrastructure investors, utilities and grid operators seeking renewable generation, energy storage and grid flexibility assets across the UK, Europe, South Asia and Southeast Asia.
Financial Health
StableStable · Hiring · 29% CAGR over 2y
Location
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Provides waste management, recycling and hazardous waste treatment, water and wastewater services, and energy solutions including district heating, renewable energy systems, energy efficiency…
Serves UK businesses, industrial operators, local authorities and public sector bodies, including organisations managing facilities, packaging obligations, hazardous waste, utilities infrastructure…
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Computed from 3 filingsDesigns, funds, installs and manages renewable energy systems for commercial and industrial sites, including solar PV, battery storage and electric vehicle charging infrastructure, providing fully…
Serves commercial and industrial businesses seeking funded renewable energy projects, including organisations with sites suitable for solar, energy storage, EV charging, or roof refurbishment.
Financial Health
StrongStrong · Hiring · 23% CAGR over 2y
Location
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Computed from 3 filingsProvides low‑carbon heating and cooling systems using geo‑exchange and underground thermal energy storage. Designs and integrates energy networks for new and existing buildings, helping commercial…
Serves B2B and public-sector organisations with buildings or estates, including food retailers, healthcare providers, education campuses, communities and city-scale developments seeking lower-carbon…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
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Computed from 3 filingsDevelops hardware and software platforms for monitoring and managing heat networks, boilers and heat pumps. Supplies smart metering hubs and analytics tools that capture energy and utility data,…
Serves residential developers, heat network operators, heat suppliers, and metering and billing providers managing communal heat networks and low-carbon heating systems across the UK.
Financial Health
WeakWeak · -17% CAGR over 2y
Location
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Computed from 5 filingsDevelops hydrogen production technology aimed at zero‑emission energy applications. Designs and commercialises electrolysis systems for generating green hydrogen for industrial processes such as…
Serves industrial B2B customers in hard-to-decarbonise sectors, including whisky and drinks production, ammonia/fertiliser manufacturing, mining and natural resources companies seeking green hydrogen…
Financial Health
StrongStrong · Hiring · 50% CAGR over 4y
Location
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Computed from 2 filingsDevelops an AI platform that analyses commercial property portfolios to assess energy efficiency, regulatory compliance risks, and retrofit opportunities. Generates building-level energy models,…
Serves commercial property owners, landlords, asset managers and real estate investors managing portfolios of offices and other commercial buildings, particularly those facing UK MEES, retrofit and…
Financial Health
StableStable · Hiring · 50% CAGR over 1y
Location
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Develops and operates green hydrogen energy systems. Produces, stores and distributes green hydrogen, and provides commercial development and technical services for hydrogen projects used in…
Serves UK businesses and public sector partners in construction, temporary infrastructure, events, transport fleets, and energy-intensive industries such as steel, glass, food and drink seeking…
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N/AN/A
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Computed from 2 filingsDevelops software for managing electric vehicle charging and connected home energy devices. Provides an energy operating system with AI-driven control, data aggregation and white‑label mobile apps…
Serves energy retailers, home electrification businesses and companies in the EV value chain, while also targeting EV drivers and home energy users through its consumer app.
Financial Health
WeakWeak · Hiring · 172% CAGR over 1y
Location
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Computed from 5 filingsDevelops, finances and operates on-site energy systems including combined heat and power plants, solar PV, energy storage, microgrids and heat networks. Provides energy centres and grid support…
Serves UK businesses and property developers in real estate, logistics, industrial, food and data centre sectors, especially organisations with high energy demand or grid capacity constraints.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 5y
Location
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Computed from 5 filingsStructures, funds and co-develops behind-the-meter energy infrastructure projects for large energy users and infrastructure assets. Services include energy analysis, optimisation and delivery of…
Serves large energy-intensive businesses and infrastructure operators, including utilities, airports, industrial supply chains and large landowners, plus institutional and strategic investors seeking…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
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Computed from 5 filingsManufactures solar inverters, energy storage systems, batteries, EV chargers, and photovoltaic building materials. Provides hardware and software for residential, commercial, and utility-scale solar…
Serves a mix of B2C and B2B customers: homeowners, small commercial and industrial businesses, larger energy users, utilities, and building owners or developers in global solar and energy storage…
Financial Health
StableStable · Hiring · 32% CAGR over 4y
Location
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Computed from 5 filingsDevelops and manages commercial solar PV and battery storage projects, including roof assessment, repairs, and fall‑protection systems. Provides design, financing, installation, and ongoing operation…
Serves UK commercial and industrial businesses, real estate investors and solar investors seeking on-site renewable energy projects to reduce electricity costs and meet Net Zero targets.
Financial Health
StableStable · 0% CAGR over 3y
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Computed from 3 filingsDevelops, finances, builds and operates renewable energy infrastructure focused on grid-scale battery storage systems. Develops battery sites and networks that store electricity and supply power to…
Serves grid-scale energy markets and partners with landowners and renewable energy developers across the UK and Europe seeking battery storage sites and infrastructure partnerships.
Financial Health
DistressedDistressed · -85% CAGR over 2y
Location
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Computed from 4 filingsProvides smart building management technology that meters, monitors and controls energy, utilities and environmental systems. Offers cloud software, sensors and automation to track electricity, gas…
Serves UK organisations managing commercial buildings or estates, including retail, education, property, markets and facilities teams responsible for single sites or multi-site portfolios.
Financial Health
StrongStrong · Hiring · 9% CAGR over 3y
Location
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Computed from 3 filingsDesigns and constructs electrical grid connections and installs electric vehicle charging infrastructure. Provides connection services for solar, wind, battery storage and other renewable energy…
Serves UK businesses and public bodies with multi-site energy and EV infrastructure needs, including property developers, car park operators, fuel forecourts, cities and towns, and transport or…
Financial Health
WeakWeak · 0% CAGR over 2y
Location
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Computed from 2 filingsDevelops and deploys energy storage systems for utility and industrial applications, including battery, gravity and hydrogen-based storage technologies. Provides energy storage hardware, project…
Serves B2B customers including utilities, renewable energy developers, independent power producers, grid operators and large energy users such as data centre operators needing grid-scale energy…
Financial Health
WeakWeak · Hiring · 66% CAGR over 1y
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Develops, constructs, owns and operates renewable energy generation and battery storage projects. Acts as an investment platform financing and managing wind, solar and energy storage assets and…
Serves investors seeking returns from renewable energy and storage projects, and works with project partners and local communities across Europe, including the UK, Finland and Italy.
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Develops and supplies hydrogen fuel cell systems, electrolyzers and related infrastructure for producing, liquefying, storing and distributing hydrogen. Provides stationary power systems and fuel…
Serves industrial businesses, warehouses and distribution centres, utilities, telecoms, rail operators and government/public-sector organisations adopting hydrogen and fuel cell energy systems.
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Computed from 3 filingsDevelops software for carbon accounting and sustainability management. Provides a SaaS platform that collects and analyses emissions data, tracks Scope 1–3 greenhouse gas emissions, sets reduction…
Serves B2B and public-sector buyers, including start-ups, multinationals, industrial firms, corporate sustainability and supply-chain teams, ports, pharmaceutical companies, local councils and…
Financial Health
StableStable · Hiring · 80% CAGR over 2y
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Provides waste management services including sorting of dry mixed recyclables, transfer of municipal waste via river transport, and energy‑from‑waste processing of non‑recyclable waste. Also recovers…
Serves public-sector waste authorities and London boroughs, with additional customers among organisations needing waste services across London and the South East.
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Computed from 3 filingsDevelops power management and control systems for integrating electrolysers with renewable energy sources. Technology enables variable DC input from solar power to improve efficiency and reduce costs…
Sells to B2B and research-sector buyers in green hydrogen, including electrolyser operators, renewable energy developers, hydrogen project partners, universities and pilot project stakeholders…
Financial Health
DistressedDistressed
Location
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Computed from 4 filingsDevelops and operates energy transition infrastructure for road transport, including secure parking sites with electric vehicle charging for cars, delivery vans and trucks, aimed at logistics fleets…
Serves businesses in UK and European logistics and urban markets, including fleet operators, last-mile delivery companies, truck operators, and commercial vehicle users, with some provision for…
Financial Health
HealthyHealthy · Hiring · 94% CAGR over 3y
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Computed from 3 filingsDevelops, invests in, and manages renewable energy projects including solar photovoltaic, onshore and offshore wind, battery energy storage, hybrid systems, and green hydrogen, providing project…
Serves municipalities, investors, landowners, farmers, and industrial or commercial businesses across Europe involved in renewable energy development, land use, and decarbonisation projects.
Financial Health
StableStable · Hiring · 36% CAGR over 2y
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Computed from 5 filingsDevelops and invests in clean infrastructure projects including solar energy generation, battery energy storage systems, and renewable‑powered data centres. Partners with investors and landowners to…
Serves institutional investors, family offices and corporate high-energy users seeking clean infrastructure opportunities, alongside landowners with sites for renewable energy, storage and…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
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Computed from 2 filingsDesigns and supplies remote renewable power systems including solar arrays, battery storage units and site lighting solutions. Provides equipment such as PowerBox, JuiceBox and VoltBox for telecom…
Serves businesses, governments and communities in the UK, Africa and Middle East, including telecoms infrastructure, construction sites, sports venues, tourism and hospitality operators, agriculture,…
Financial Health
StableStable · 0% CAGR over 1y
Location
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Computed from 5 filingsProvides protection and control engineering for electrical transmission and grid infrastructure, including battery energy storage systems. Services include design, build and commissioning of…
Serves UK businesses in battery energy storage and grid infrastructure, including developers, asset owners, operators and contractors requiring TP141-aligned engineering support.
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StrongStrong · Growing, Hiring · 5% CAGR over 4y
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Computed from 3 filingsDevelops, installs and operates electric vehicle charging infrastructure at hospitality, leisure and retail destinations. Provides funded charging installations, destination chargers and rapid…
Serves B2B site owners and operators in hospitality, leisure and retail across the UK and Europe, including destinations and rapid-hub locations with visitor and customer parking.
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StableStable
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Computed from 3 filingsDevelops, finances and manages renewable energy projects focused on solar power and battery storage systems. Provides site assessment, project development, construction management, and long‑term…
Serves B2B renewable energy partners, utilities, investors and large energy users such as data centres seeking solar and battery storage projects across its global markets.
Financial Health
DistressedDistressed · -85% CAGR over 2y
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Computed from 4 filingsProvides energy‑efficient commercial LED lighting systems for businesses, offering surveys, lighting design, analysis, procurement, project management, installation and ongoing maintenance. Also…
Serves large commercial and industrial businesses across the UK and Europe, including agrifood, manufacturing, warehousing, retail, office and car park operators.
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StableStable · 0% CAGR over 3y
Location
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Computed from 5 filingsDevelops, designs and manages renewable energy infrastructure projects, including solar power and battery storage. Provides project development, energy solutions and lifecycle management for…
Serves residents and commercial organisations seeking renewable energy solutions, including businesses looking to reduce energy costs and emissions, renewable infrastructure asset owners/projects,…
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HealthyHealthy
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Computed from 5 filingsDevelops, constructs and operates utility‑scale renewable energy projects, focusing on solar photovoltaic farms, battery energy storage systems (BESS) and flexible generation. Provides project…
Serves UK agricultural landowners seeking farm diversification and energy-sector partners, including EPC providers and infrastructure funds, involved in utility-scale renewable energy and battery…
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StrongStrong · Growing, Hiring · 37% CAGR over 4y
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Computed from 3 filingsDevelops and manages solar energy and battery storage projects, including rooftop solar installations for commercial buildings and ground‑mounted solar farms. Leases or acquires land and roof space,…
Serves commercial property owners, tenants, farmers and landowners with unused rooftops or low-grade land, plus businesses seeking income from renewable energy sites in the UK.
Financial Health
WeakWeak · 0% CAGR over 2y
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Computed from 5 filingsDevelops and operates renewable energy and low‑carbon fuel projects, including wind farms and infrastructure for producing green hydrogen and green ammonia. Integrates power generation, port and…
Targets heavy industry, transport and energy-sector buyers seeking green hydrogen, green ammonia and other clean fuels, with emphasis on global and European energy markets.
Financial Health
HealthyHealthy · 0% CAGR over 4y
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Computed from 5 filingsDevelops carbon capture and storage (CCS) projects for industrial decarbonisation, focusing on carbon transport and offshore storage infrastructure. Works with partners across the CCS value chain to…
Serves large industrial emitters and partners across the carbon capture and storage value chain, including energy, transport and storage stakeholders pursuing large-scale decarbonisation projects.
Financial Health
HealthyHealthy
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Computed from 3 filingsDevelops, builds, and operates large-scale photovoltaic solar power plants and energy storage systems. Provides project development, engineering, construction support, and operational services for…
Serves UK landowners and energy-sector organisations involved in large-scale solar, wind-solar and battery storage projects, including partners and stakeholders in renewable electricity…
Financial Health
StableStable · Hiring · 200% CAGR over 2y
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Computed from 3 filingsDevelops and finances carbon credit projects that avoid, remove, and store CO2 using nature-based and engineered approaches. Provides a platform for project assessment, monitoring, and verification…
Serves carbon project operators, strategic capital investors and organisations buying nature-based carbon credits, especially teams developing, financing or sourcing large-scale CO2 avoidance,…
Financial Health
StrongStrong · Growing, Hiring · 160% CAGR over 2y
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Computed from 5 filingsDevelops utility-scale renewable energy projects, focusing on solar farms and battery energy storage systems. Provides project development, partner coordination and asset management across the…
Serves UK commercial energy users, landowners, and renewable energy asset owners or investors involved in solar, battery storage, business energy, and asset management projects.
Financial Health
StableStable · Hiring · 27% CAGR over 4y
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Computed from 5 filingsProvides energy consultancy and project management services, including evaluation, design, supply, installation and maintenance of energy efficiency systems, distributed generation, microgrids and EV…
Serves B2B customers, including enterprises, corporations and energy-intensive industries seeking green energy, energy efficiency, EV charging, microgrid and distributed generation projects.
Financial Health
HealthyHealthy · -12% CAGR over 4y
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Computed from 5 filingsProvides engineering consultancy services including design, development and implementation of industrial processes and facilities. Supports projects in areas such as industrial gases, biofuels,…
Serves B2B clients including operators, project leaders, investors and technologists at global companies in industrial gas, biofuels, renewable energy and green technology, especially those pursuing…
Financial Health
StableStable · Hiring · 14% CAGR over 4y
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Computed from 2 filingsDevelops and manages renewable energy infrastructure projects, including solar generation and battery storage. Designs and delivers renewable energy systems for commercial customers and provides…
Serves commercial energy users, renewable infrastructure companies, finance partners and residents seeking renewable energy solutions, with emphasis on businesses reducing energy costs and emissions…
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StrongStrong
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Computed from 3 filingsDevelops and plans multi‑energy refuelling hubs for commercial vehicle fleets, providing consultancy, financing and project advisory services for infrastructure offering electric charging, HVO,…
Serves UK commercial vehicle operators, including van fleets and low- or zero-emission HGV fleets, with facilities aimed at fleet managers and drivers needing refuelling and charging on routes.
Financial Health
StrongStrong · Hiring · 108% CAGR over 2y
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Computed from 5 filingsProvides electric vehicle charging infrastructure and services for businesses and drivers, including installation and operation of charge points, payment and pricing systems, a charging network, and…
Serves EV drivers and businesses managing visitor or staff parking, including hotels, leisure venues, residential developments, workplaces, retailers and public-sector sites across the UK.
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StrongStrong
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Computed from 5 filingsDevelops, builds and operates onshore wind and solar energy projects. Activities include site identification, securing land agreements, planning applications, project financing and construction, and…
Serves UK landowners with potential wind or solar sites and businesses seeking renewable electricity through corporate PPAs, alongside stakeholders in renewable energy project planning, financing and…
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StrongStrong · Growing, Hiring · 17% CAGR over 4y
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Computed from 5 filingsDevelops, builds and operates utility-scale renewable energy projects. Identifies sites, secures land agreements and planning permission, manages construction, and monitors and operates energy assets…
Targets UK landowners with viable sites for utility-scale renewable energy projects, while engaging local communities, local authorities and community groups affected by developments.
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StrongStrong · Hiring · 114% CAGR over 4y
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Computed from 2 filingsDevelops, constructs and operates grid‑scale battery energy storage systems. Manages the development, construction and market operation of battery energy storage assets that store electricity and…
Serves UK electricity and flexible energy markets, targeting grid operators, utilities and energy-sector counterparties involved in renewable generation and battery storage infrastructure.
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StableStable
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Computed from 2 filingsProvides energy‑efficient commercial LED lighting systems for industrial and business facilities. Services include site surveys, lighting design and analysis, procurement, project management,…
Serves large commercial and industrial businesses across the UK and Europe, including agrifood operators, car parks, manufacturers, offices, retailers and warehousing facilities seeking funded or…
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StableStable · 0% CAGR over 1y
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How London Cleantech companies work and how to sell to them
What they do
Revenue usually comes from a blend of consulting, project delivery, software subscriptions, licence fees, maintenance and managed service income. Hardware-facing suppliers may earn through equipment sales, installation margins and ongoing service contracts, while software-led firms tend to charge recurring fees for monitoring, reporting or optimisation tools. Some service models link pricing to measured savings or delivered outcomes, although many buyers still prefer fixed-scope assessments before committing budget. Engagements often move from a diagnostic phase into implementation only when payback, compliance value or operational risk reduction is clear enough for finance and procurement teams.
Who they sell to
Typical customers are commercial landlords, industrial operators, local authorities, infrastructure owners and property-heavy organisations with exposed energy, waste, water or emissions costs. The buyer is often not one person: sustainability leads shape the requirement, energy and estates teams test feasibility, procurement controls process, and finance teams usually challenge payback assumptions. Software-only tools may sell through direct sales or self-serve trials, but site-based work tends to involve tenders, partner referrals and multi-stage approval. Contract values vary widely, with shorter cycles for assessments and longer cycles where installation, public procurement or operational handover is involved.
What they buy
Most London cleantech firms tend to spend on tools and services that help them prove outcomes, deliver projects and manage regulated commercial relationships. Common needs include CRM, proposal management, bid support, project accounting, field service workflows, asset monitoring, cloud hosting, cybersecurity, analytics, billing and customer reporting. Engineering-led teams also buy design support, installation capacity, insurance, legal advice, health and safety services, certification support and specialist recruitment. Software-led suppliers are more likely to buy developer tooling, data infrastructure, product analytics and customer success systems, particularly when they are moving from bespoke deployments towards repeatable contracts.
Why and how to sell to them
Buying intent tends to appear when a firm wins larger site deployments, moves from pilots into repeatable delivery, hires senior commercial or operations staff, or faces pressure to document savings for customers. Common pain points are long procurement cycles, evidence-heavy sales processes, delivery coordination, working-capital strain on hardware projects and the need to translate climate claims into operational metrics. Outbound messages are usually more credible when they refer to payback evidence, tender conversion, installation control, customer reporting or margin protection. Broad sustainability language is weaker than a clear link to cost, compliance or delivery 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
Related directories
Frequently asked questions
How many cleantech companies are there in London?
What counts as a cleantech company in this list?
Which are the largest cleantech companies in London?
What do cleantech companies in London actually do?
How does London cleantech compare internationally?
How is this list built and how fresh is the data?
How big are the typical cleantech companies in London?
Are these mostly new or established cleantech companies?
What SIC codes does this use?
What buying signals should I look for?
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