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Climate Tech Companies in the UK: 1,091 Active Firms (2026)
Climate tech companies in the UK build products and services that measure, reduce or adapt to carbon and climate risk across sectors.
Buying usually sits with sustainability, finance, estates, operations and engineering teams rather than an isolated software owner. Sellers range from carbon-accounting and climate-risk software providers to engineering, project-delivery and advisory businesses, so procurement motions vary by use case. Smaller customers may buy a subscription tool or discrete assessment; mid-market and enterprise buyers tend to ask for integrations, audit trails, sector-specific workflows and evidence that emissions, resource-efficiency or resilience work can be tied to budgeted programmes. Public bodies and infrastructure operators add longer procurement cycles and a heavier burden of assurance.
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The UK cohort contains 1,091 actively trading climate tech companies. Reported headcount across the group is 2,893, which points to a market with many lean technical operators alongside a smaller set of employers with broader delivery capacity. Revenue scale is uneven: a £5M-plus turnover band exists, but it is not the centre of gravity. Newer incorporations also sit alongside more established engineering, data and advisory models, giving researchers a mix of early-commercial firms and businesses already selling into infrastructure, industrial and public-sector procurement.
Operating context is fragmented because climate tech covers a collection of activities rather than a common regulated market. Software and advisory models usually meet buyers through procurement, disclosure and assurance processes, while engineering and project-delivery businesses sit closer to permitting, site access, metering, safety cases and contract risk. Public-sector and infrastructure customers often lengthen sales cycles, and industrial customers tend to test claims against operational uptime, payback and auditability. That makes evidence, liability allocation and implementation responsibility as important as the climate outcome itself.
Future development appears likely to favour businesses that can move from project-by-project work into repeatable products, while still satisfying sector-specific assurance demands. Carbon measurement alone may be exposed to commoditisation unless it connects to finance, procurement or operational decisions. Engineering-led providers tend to have more delivery complexity but clearer links to capital projects, which can support larger contracts when buyers have budgets. Consolidation could emerge around platforms that combine measurement, workflow and implementation, although the cohort still looks fragmented enough for specialist operators to persist.
1,091
Active firms
2026
111
Above £5M
Revenue threshold
172
Recent incorporations
Since 2022
Key facts
About 10% of the trading cohort reports turnover above £5M (111 of 1,091 firms) — the rest sits below that revenue band.
15% of the cohort was incorporated since 2022 (172 firms), so a sizeable share is in its first few filing cycles.
Climate tech suppliers sell into procurement, finance, energy, property and industrial teams, so buying cycles vary by function rather than by sustainability teams alone.
Carbon accounting and climate-risk tools tend to sit close to reporting, audit and supplier-management workflows.
Emissions-reduction providers span software-led measurement and project-led delivery, which can create different operating profiles within the same sector label.
Adaptation-focused companies usually address physical climate risk in assets, supply chains and property portfolios.
Top UK Climate Tech companies
Airhive Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops direct air capture (DAC) technology and facilities that remove CO₂ from ambient air using fluidised-bed systems. Supplies captured CO₂ for industrial uses such as beverage carbonation and…
Sells to businesses seeking carbon removal credits, industrial CO2 users such as beverage and sustainable aviation fuel producers, industrial gas integrators, and technology partners buying or…
Financial Health
StableStable · Hiring · 155% CAGR over 2y
Location
Carbon Clean Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
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
Carbon Capture Machine (UK) Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops carbon capture and utilisation technology that captures CO₂ from industrial emissions and converts it into mineralised carbonates for use in cement and other materials, aiming to reduce…
Serves B2B industrial emitters and hard-to-decarbonise sectors, including cement producers and manufacturers that use mineral carbonate inputs, plus partners in government-funded climate and…
Financial Health
StableStable · -37% CAGR over 2y
Location
Zero 6 Projects Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops, finances, engineers and operates decarbonisation and renewable energy projects, including wind, solar, carbon capture and green hydrogen facilities. Also provides electrical engineering and…
Targets B2B customers: renewable energy investors, utilities, large industrial corporates and nuclear power operators with capital-intensive decarbonization and clean energy infrastructure needs.
Financial Health
StrongStrong · Hiring · 39% CAGR over 4y
Location
Neuer Energy Limited
Trajectory
3y · 2022–NowFinancial sub-scores
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
Location
MOF Technologies Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops carbon capture technology for industrial emissions. Uses metal‑organic framework adsorbents and vacuum swing processes to remove CO2 from flue gas, supplying modular capture units and pilot…
Serves industrial emitters and plant operators in hard-to-abate sectors seeking carbon capture retrofits, including lime, energy-from-waste and biomass facilities, alongside CCUS project developers…
Financial Health
StableStable · Hiring · 55% CAGR over 2y
Location
C-Capture Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops carbon capture technology using non‑amine solvent processes to remove CO2 from industrial flue gas. Designs and tests pilot plants aimed at reducing energy requirements and tolerating…
Serves B2B industrial and energy-sector organisations with flue gas emissions, including plant operators evaluating carbon capture technologies.
Financial Health
WeakWeak · Hiring · 26% CAGR over 1y
Location
ZapCarbon Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops low‑carbon and energy efficiency technologies for residential buildings, including shower water heat recovery systems and IoT home monitoring platforms that collect temperature and humidity…
Serves public and private sector housing organisations, including social landlords, housing providers and property managers responsible for resident homes, compliance, damp and mould risk, energy…
Financial Health
StrongStrong · Growing, Hiring · 79% CAGR over 4y
Location
Eco3 Partnership Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides environmental and sustainability consulting focused on net‑zero strategies. Offers carbon and energy data management software, emissions reporting (Scope 1–3), ESG compliance support, and…
Serves businesses and other organisations in the UK and internationally, especially those with asset portfolios, supply chains, buildings, transport, energy, water and waste impacts.
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 5y
Location
SEABOUND CARBON LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides onboard carbon capture systems for maritime vessels that capture CO2 from ship exhaust and convert it into solid carbonate for offloading and storage or reuse. Designs and installs…
Targets shipowners and fleet operators in commercial shipping that need to reduce fleet greenhouse-gas emissions under regulatory, customer and shareholder pressure.
Financial Health
StrongStrong · Growing, Hiring · 138% CAGR over 2y
Location
ORIGEN POWER LTD
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDevelops and deploys technology for producing zero‑emission lime from limestone and for capturing carbon dioxide from the air. Provides industrial decarbonisation infrastructure and processes that…
Serves industrial and climate-sector organisations seeking large-scale CO₂ emissions reduction and durable carbon removal, including partners in lime, direct air capture and decarbonization…
Financial Health
StableStable · -66% CAGR over 4y
Location
MPL TECHNOLOGY GROUP LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides energy and environmental monitoring systems and software for organisations. Offers metering, power quality monitoring, estate and data centre energy management platforms, with reporting and…
Serves B2B organisations with energy-intensive estates, including data centres, telecoms operators and multi-site facilities, targeting facilities, sustainability and compliance teams responsible for…
Financial Health
WeakWeak · Hiring · 4% CAGR over 4y
Location
Pure Thermal Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies low‑carbon heating and cooling equipment including heat pumps, chillers, thermal energy storage systems, and waste heat recovery solutions. Provides system design support, equipment supply,…
Serves B2B and public-sector customers in commercial and industrial heating and cooling, including FM/building services, food and drink, manufacturing, process, pharmaceutical and chemical sectors,…
Financial Health
StrongStrong · Growing, Hiring · 32% CAGR over 4y
Location
SYNCHROSTOR LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops thermal energy storage systems and compressor‑expander technology for industrial heat electrification. Designs systems that provide high‑ and low‑temperature thermal energy for processes…
Serves industrial organisations in hard-to-electrify sectors, including businesses with decarbonised heat, cooling, energy storage or drying applications, and partners pursuing clean energy projects.
Financial Health
StrongStrong · Growing, Hiring · 47% CAGR over 4y
Location
ULEMCo Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsEngineers hydrogen fuel systems for heavy‑duty vehicles and equipment, including dual‑fuel conversions for diesel engines, hydrogen combustion powertrains, fuel‑cell range extenders, and mobile…
Serves B2B operators of heavy-duty commercial fleets and specialist equipment, including HGV, construction, engineering, airport, port and short-sea maritime operations seeking fleet decarbonisation.
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 2y
Location
CERAPHI ENERGY LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops geothermal energy projects and technology for heating, cooling and power generation. Uses expertise from the oil and gas sector to access subsurface heat and deliver baseload renewable…
Serves organisations with Net Zero targets, including commercial and industrial energy users seeking to decarbonise heating, cooling and power.
Financial Health
StableStable · Hiring · 22% CAGR over 4y
Location
GRID EDGE LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops AI-based energy management software for commercial buildings. Platform analyses meter, BMS and sensor data to monitor consumption, provide dashboards, alerts and optimisation actions,…
Serves businesses that own or operate commercial building portfolios, particularly CFOs, energy managers and facilities teams responsible for energy use, carbon targets and costs across metered, BMS…
Financial Health
StrongStrong · -4% CAGR over 2y
Location
HEATCATCHER LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering services for industrial waste heat recovery, assessing recoverable heat from manufacturing processes and designing systems such as high‑temperature heat pumps and Organic Rankine…
Serves B2B industrial manufacturers with heat-intensive sites, including glass, ceramics and brick producers, targeting energy, sustainability and engineering teams responsible for heat…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
Cotopaxi Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides energy management and carbon reduction services for industrial and commercial organisations, including energy consulting, monitoring and targeting, and utility optimisation. Develops Strata…
Serves industrial and commercial organisations globally, especially energy-intensive manufacturers in food and beverage, chemicals, metals, glass, cement, pharmaceuticals, utilities, oil and gas, and…
Financial Health
HealthyHealthy · -8% CAGR over 2y
Location
Carbon Footprint Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides environmental consultancy and software for organisations to measure and manage greenhouse gas emissions. Services include carbon footprint assessments, net‑zero target setting, supply‑chain…
Serves businesses, multi-site organisations and public sector bodies needing carbon measurement, reporting and Net Zero support, including supply chains, product teams, event organisers, airlines and…
Financial Health
StrongStrong · Growing, Hiring · 28% CAGR over 4y
Location
PROGRESSIVE ENERGY LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops and delivers low‑carbon energy and decarbonisation projects, including hydrogen production, carbon capture and storage, and biomethane initiatives. Provides technical, commercial and project…
Serves large industrial, energy, transport and heating-sector organisations, plus project partners and clients involved in UK net-zero hydrogen, carbon capture and low-carbon infrastructure…
Financial Health
StableStable · Hiring · 15% CAGR over 5y
Location
Revalue Nature Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
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
Location
Carbon Catalyst Limited
Trajectory
5y · 2022–NowFinancial sub-scores
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
Location
Carbon Responsible Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides carbon accounting and emissions measurement services for businesses, using software and data analysis to measure and verify greenhouse gas emissions, audit supply‑chain data, produce…
Serves businesses across diverse sectors, including organisations with complex supply chains and investment portfolios, targeting sustainability, finance and compliance teams responsible for carbon…
Financial Health
WeakWeak · Hiring · 66% CAGR over 4y
Location
IO Controls Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and maintains building energy management and control systems for commercial properties. Provides system upgrades, integration, monitoring and maintenance to improve energy…
Serves B2B customers in the UK commercial property sector, including landlords, property owners, managing agents, asset management teams, consultants, project stakeholders and building occupiers…
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
MISSION ZERO TECHNOLOGIES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops electrochemical direct air capture technology that extracts carbon dioxide from the atmosphere. Supplies captured CO₂ for permanent geological storage or for use in products such as…
Serves B2B carbon removal project developers, CO₂ users, engineers and research partners in sectors including sequestration, sustainable building materials and e-fuels.
Financial Health
StableStable · -85% CAGR over 2y
Location
SUSTAINABLE INVESTMENTS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsHolding company for a group that delivers energy‑efficiency retrofit and property maintenance services, manufactures external wall insulation systems, and develops smart building technology that…
Serves local authorities, housing associations and social housing providers, primarily through public-sector frameworks and grant-funded housing retrofit and decarbonisation programmes across the UK.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Carbon Capture Scotland Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsCaptures, removes and sequesters biogenic carbon dioxide from fermentation industries and biogas plants. Purchases CO2 streams, manages transport and permanent storage, and sells verified carbon…
Serves fermentation businesses and biogas plant operators with biogenic CO2 streams, and sells carbon removal credits to corporate buyers and public-sector purchasers seeking permanent removals.
Financial Health
HealthyHealthy · Hiring · 28% CAGR over 4y
Location
SYNERGIE ENVIRON LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides low‑carbon engineering and consultancy services for energy and industrial sectors, including project development and execution for anaerobic digestion and biofuels, district energy networks,…
Serves B2B and public-sector clients in energy, oil and gas, food production, leisure, brewing, transport and local government, particularly organisations with industrial sites or heat and energy…
Financial Health
WeakWeak · -37% CAGR over 2y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops life cycle assessment (LCA) software and provides consultancy and data services that help companies collect supplier and supply‑chain data, model environmental impacts, produce ISO‑compliant…
Serves businesses in the raw materials and technology sectors, especially teams managing complex supply chains and needing environmental metrics for regulators, investors, downstream off-takers and…
Financial Health
HealthyHealthy · Hiring · 61% CAGR over 4y
Location
ASSET PLUS ENERGY PERFORMANCE LIMITED
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides consulting, development, financing and implementation of energy infrastructure upgrades, including energy efficiency and zero‑carbon generation projects. Delivers projects for public and…
Serves public and private sector organisations across the UK and Ireland, including councils, colleges and accommodation providers seeking to reduce energy use and progress toward net zero carbon…
Financial Health
StrongStrong · Hiring · 46% CAGR over 5y
Location
KBC INT LTD
Trajectory
4y · 2020–NowFinancial sub-scores
Computed from 4 filingsProvides consulting and software for energy and process industries, including digital energy management, carbon emissions monitoring, process simulation, and operational optimisation tools. Develops…
Serves energy and process-industry businesses, including upstream and downstream oil and gas operators, refineries, petrochemical producers and asset owners pursuing energy transition and operational…
Financial Health
WeakWeak · Hiring · 2% CAGR over 4y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
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
RENEW POWER INTERNATIONAL LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsOperates as a holding company for a group developing, owning and operating renewable energy assets including utility-scale wind, solar and hydropower projects. Also provides corporate decarbonisation…
Serves B2B energy buyers, including large corporates and industrial organisations pursuing net-zero goals, as well as utility-scale power purchasers seeking renewable energy and decarbonisation…
Financial Health
StableStable · -16% CAGR over 4y
Location
CADE ENERGY LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides consultancy, development, installation and operation of renewable energy systems for commercial clients. Delivers solar power purchase agreements, biomass heat and combined heat and power…
Serves businesses across the UK with renewable energy and decarbonisation needs, including education and healthcare organisations, farms, forestry operators, breweries/distilleries, waste and…
Financial Health
StrongStrong · Growing, Hiring · 16% CAGR over 5y
Location
CR PLUS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides consultancy services to industrial and public sector organisations on energy efficiency, decarbonisation and cost reduction. Conducts feasibility studies, engineering design and project…
Serves private and public sector organisations, especially industrial businesses and clusters across the UK, with buyers in operations, engineering, sustainability, finance and compliance roles.
Financial Health
WeakWeak · -6% CAGR over 2y
Location
CAP ENERGY SOLUTIONS LIMITED
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides appliance-level energy monitoring systems combining smart sensors and software to track electricity use of individual commercial appliances. Installs monitoring devices and offers a platform…
Sells to businesses operating appliance-heavy sites, especially restaurants and commercial kitchens, that want to reduce energy costs and carbon use. Targets operators managing equipment such as…
Financial Health
StrongStrong · Growing, Hiring · 108% CAGR over 3y
Location
SECONDLAW TECHNOLOGIES LIMITED
Trajectory
1y · 2025–NowDevelops weather modelling and forecasting software for energy and power markets, producing data and analytical tools used to assess weather impacts on electricity generation, demand, and energy…
Serves energy-sector organisations involved in the energy transition, likely including renewable energy, grid, trading, and infrastructure teams needing weather-related decision support.
Financial Health
Insufficient historyInsufficient history
Location
ANTACO (UK) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and deploys waste processing technology that converts organic waste into carbon‑neutral solid fuel (“biocoal”) using hydrothermal carbonisation. Provides waste management solutions and…
Targets organisations with organic waste streams, including businesses and waste management operators seeking disposal, recycling or landfill-diversion options.
Financial Health
DistressedDistressed · -31% CAGR over 4y
Location
ClimatePartner UK Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides carbon accounting software, emissions analysis, and sustainability consulting to help organisations measure product and corporate carbon footprints, set reduction targets, develop…
Serves B2B customers, from consumer brands and retailers to manufacturers, logistics, insurers and telecoms, targeting sustainability, compliance and leadership teams responsible for net zero and…
Financial Health
StrongStrong · Growing, Hiring · 20% CAGR over 4y
Location
Energy Auditing Agency Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides energy management and sustainability consultancy services, including carbon reduction strategy, energy audits, compliance reporting and certification. Also supplies energy management…
Sells primarily to organisations in the UK, including public sector bodies and businesses in aerospace, construction, education, emergency services, NHS, retail, transport, logistics, utilities and…
Financial Health
WeakWeak · -66% CAGR over 4y
Location
CURA ENERGY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides energy management and smart building solutions, including energy monitoring, sub‑metering installation, building energy management systems, and data‑driven energy reduction services for…
Serves large UK businesses and public-sector organisations with complex, multi-site estates, including major retail brands, healthcare providers, multi-tenancy workplaces, finance organisations and…
Financial Health
WeakWeak · -66% CAGR over 4y
Location
Supercritical Tech Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsOperates an online marketplace for carbon removal credits, enabling corporate buyers to source, compare and purchase verified carbon removal from projects such as biochar and direct air capture,…
Sells to corporate buyers procuring carbon removal for net zero commitments, including sustainability and procurement teams at businesses seeking spot purchases, multi-year offtake agreements, and…
Financial Health
HealthyHealthy · Hiring · 77% CAGR over 3y
Location
NET ZERO UK HOLDINGS LIMITED
Trajectory
2y · 2024–NowDevelops carbon reporting software and provides sustainability consulting to help organisations measure and report greenhouse gas emissions, create carbon reduction and net zero strategies, purchase…
Serves businesses and organisations of all sizes, from SMEs to multinational corporations, seeking support with carbon reporting, reduction, offsetting and net zero goals.
Financial Health
Insufficient historyInsufficient history
Location
City Science Corporation Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops data-driven analytical tools and modelling for transport, energy and urban systems. Provides decarbonisation strategies, carbon accounting, transport planning, and geospatial analysis to…
Serves public and private organisations with decarbonisation responsibilities, including local authorities, transport and highways bodies, energy and infrastructure teams, transport operators,…
Financial Health
StrongStrong · Growing, Hiring · 30% CAGR over 4y
Location
The Carbon and Energy Fund Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides a procurement and delivery framework for NHS trusts and local authorities to develop energy infrastructure and decarbonisation projects, including securing finance, procuring contractors,…
Serves UK public sector organisations, particularly NHS trusts, hospitals and local authorities, working with estates, capital projects and finance teams responsible for energy infrastructure and…
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 4y
Location
Avon Energy Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides carbon management and sustainability consultancy, including greenhouse gas emissions inventories, product carbon footprinting, decarbonisation strategies, transition planning, and regulatory…
Serves organisations from start-ups to multinational corporations with climate programmes, carbon reporting obligations, net-zero transition plans and emissions management needs, including teams…
Financial Health
StableStable · 0% CAGR over 2y
Location
SUSTAINABLE BUILDING SERVICES (UK) LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides retrofit and decarbonisation contracting for residential properties, delivering energy efficiency upgrades, low‑carbon heating and whole‑house retrofit programmes. Manages large-scale…
Serves public-sector and B2B clients managing UK housing stock, including social housing providers, local authorities, housing associations and private residential landlords/property owners across…
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 4y
Location
Simply Sustainable Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides ESG and sustainability consultancy services including strategy development, carbon footprinting, net‑zero target setting, climate risk management, regulatory reporting support (e.g., CSRD,…
Serves corporate ESG and sustainability leaders across built environment, finance, food and beverage, hospitality, manufacturing, pharmaceuticals, professional services, retail, technology, media,…
Financial Health
StableStable · Hiring · 35% CAGR over 4y
Location
FOREST CARBON LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and manages nature‑based carbon projects including woodland creation and peatland restoration. Works with businesses and landowners to fund projects, generate and sell verified carbon…
Serves businesses seeking carbon and nature-based project partnerships, alongside landholders with woodland or peatland projects. Also targets corporate sponsors and organisations needing carbon…
Financial Health
HealthyHealthy · Hiring · 15% CAGR over 4y
Location
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How UK Climate Tech companies work and how to sell to them
What they do
Climate tech firms earn revenue through a mixture of recurring software subscriptions, one-off assessments, project-delivery fees, managed services and, in some engineering-led cases, equipment sales with maintenance attached. Pricing often follows the unit of value: sites, assets, emissions categories, data volume, users or project milestones. Lower-friction tools can be bought annually, while implementation-heavy work is scoped around feasibility, installation, commissioning and handover. Many firms have to turn technical credibility into repeatable commercial packaging, especially where the buyer needs evidence for carbon reduction, resource efficiency or physical climate resilience rather than a generic dashboard.
Who they sell to
Customers are typically organisations with disclosure duties, energy costs, physical assets or supply-chain pressure. That includes mid-market businesses, enterprise buyers, infrastructure operators, industrial groups, property owners and public bodies. Decision-makers tend to sit across sustainability, finance, operations, estates, engineering, procurement and technology, so a sale may need several internal sponsors. Smaller tools can move through direct sales or self-serve procurement, but larger deals often require security review, legal negotiation, technical validation and sometimes an RFP. Buying cycles usually lengthen when the project touches critical operations, regulated assets or public money.
What they buy
Most climate tech firms tend to spend on cloud infrastructure, data storage, modelling tools, analytics, security, customer relationship management, billing, finance systems and project-management software. Product-led teams may also buy developer tooling, observability, integration support and user research. Engineering and advisory-led businesses are more likely to need design software categories, field-service systems, quality management, insurance, health and safety support, technical recruitment, bid writing and specialist legal advice. Sales and marketing spend is usually most defensible when it supports trust-building: case studies, procurement collateral, partner programmes, sector events and evidence packs for buyers with assurance requirements.
Why and how to sell to them
Climate tech buyers tend to evaluate vendors when pilots become repeatable products, enterprise customers ask for audit trails, a funding round increases hiring, a public tender demands proof of delivery, or project margins start to suffer from manual work. Pain points are often practical rather than ideological: data quality, integration effort, long procurement cycles, liability, skills gaps and the need to prove outcomes without over-claiming. Outbound usually works better when it links to commercial control, delivery risk or buyer assurance. Broad climate messaging is less useful than showing how a category reduces sales friction, implementation burden or reporting effort.
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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