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Cleantech Companies in Bristol: 25 Active Firms (2026)
Cleantech companies in Bristol develop low-carbon products, services and infrastructure for energy, transport, waste and built-environment markets.
Buying centres sit mainly in energy, transport, waste, water, construction and industrial operations, with sustainability teams often acting as internal sponsors rather than the sole budget holder. Sales are usually business-to-business and project-led: pilots, site assessments, technical-services contracts, asset-light operating agreements and infrastructure-adjacent delivery work. The buyer profile skews towards small and lower mid-market customers that need measurable emissions reduction or resource-efficiency gains, but cannot always absorb long implementation cycles. Bristol suppliers therefore tend to need both technical credibility and a practical route through procurement, installation, maintenance and reporting.
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Bristol has 25 actively trading cleantech companies in this list, making it a compact local cohort rather than a broad regional market in its own right. Reported employment totals 529 people, which points to a base of small operators with a limited number of larger employers around them. Only 2 companies have passed £5M in turnover, so the revenue profile remains weighted towards early-commercial and lower mid-market firms. That matters for researchers: many businesses here are likely to be judged less by headline scale than by customer traction, delivery capacity and repeatability of project revenue.
Operating conditions tend to be set by the buyer as much as by sector-specific rulebooks. Energy, transport, waste, water and construction customers often require evidence on emissions reduction, site safety, insurance, planning or asset performance before they let suppliers into delivery programmes. That favours firms able to sell into technical and procurement teams, not only sustainability leads. For smaller Bristol suppliers, the harder market-structure issue is usually converting demonstrators into repeatable contracts across infrastructure-adjacent buyers, where purchasing cycles can be cautious and proof requirements are rarely light.
The Bristol cohort appears tilted towards applied services, project delivery and infrastructure-adjacent models rather than pure product businesses. That mix tends to keep growth tied to customer procurement cycles, site access and proof of operational performance. Scale-up scarcity may persist where firms need working capital or asset ownership before revenue becomes repeatable. At the same time, buyers in energy, transport, waste, water and construction are likely to keep asking for measurable carbon and efficiency outcomes. Consolidation may therefore come less from brand-led software roll-ups and more from operators bundling technical capability, delivery capacity and local relationships.
25
Active firms
2026
2
Over £5M
Revenue band
4
Since 2022
New incorporations
Key facts
About 8% of the trading cohort reports turnover above £5M (2 of 25 firms) — the rest sits below that revenue band.
16% of the cohort was incorporated since 2022 (4 firms), so a sizeable share is in its first few filing cycles.
Bristol cleantech covers low-carbon products, services and infrastructure for energy, transport, waste and built-environment markets.
Procurement tends to sit across energy users, transport operators, waste contractors and property owners, rather than a single buyer group.
Cost and carbon pressures can turn low-carbon technology into procurement activity, not just policy language.
Local operators include lean product developers, project-led service providers and firms selling through pilots or consultancy contracts.
Top Bristol cleantech companies
CLEAN ENERGY PROSPECTOR LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, develops and operates community energy microgrids for residential developments. Works with housebuilders, housing providers and investors to deploy local renewable generation and smart grid…
Serves homeowners and occupiers, housebuilders, developers, housing associations, community land trusts, cohousing communities, neighbourhood partnerships and impact investors involved in community…
Financial Health
HealthyHealthy · Hiring · 15% CAGR over 4y
Location
Therma-Mech Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and builds district heating and cooling systems, including energy centres, distribution networks and energy substations. Provides engineering, installation and commissioning services for…
Serves UK clients commissioning district heating and cooling networks, including local authorities, commercial and residential developers, institutions, data centres and waste plants.
Financial Health
StrongStrong · Growing, Hiring · 63% CAGR over 4y
Location
Therma-Mech Developments Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs district heating and cooling networks, including energy centres, distribution pipework and energy substations. Provides turnkey engineering services covering design, construction…
Serves UK public-sector bodies, property developers, commercial landlords, residential scheme owners and institutions needing district energy networks and low-carbon heating or cooling infrastructure.
Financial Health
StrongStrong · Growing, Hiring · 77% CAGR over 5y
Location
OORT ENERGY LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures proton exchange membrane (PEM) hydrogen electrolysers and modular electrolyser systems that produce green hydrogen from water and electricity. Provides scalable units for…
Sells to businesses and project developers deploying green hydrogen systems, including industrial users with high-demand hydrogen applications and organisations building multi-megawatt, off-grid or…
Financial Health
DistressedDistressed · 83% CAGR over 1y
Location
WASE Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops electro‑methanogenic wastewater treatment and waste‑to‑energy technology. Designs and installs modular biogas systems that convert industrial wastewater and by‑products into methane and…
Serves B2B customers with organic waste streams, including anaerobic digestion operators, breweries, distilleries, dairy and agricultural producers, and food and beverage manufacturers.
Financial Health
StrongStrong · Hiring · 15% CAGR over 4y
Location
Develops renewable energy projects including onshore wind farms, solar PV plants, hydro schemes and energy storage facilities. Undertakes site development and planning for utility‑scale generation…
Location
Develops, finances, constructs and operates utility‑scale renewable energy projects, including solar farms, wind installations and battery storage. Works with landowners, businesses and utilities and…
Serves UK landowners and farmers, corporate energy buyers, investors, local authorities and communities involved in utility-scale renewable energy projects, with electricity ultimately supplying…
Location
Develops, finances, builds and operates utility‑scale renewable energy projects, including solar farms, wind and battery storage systems. Manages project design, grid connection, construction and…
Serves UK landowners and farmers, corporates seeking renewable power purchase agreements, investors, local authorities and communities involved in utility-scale renewable energy projects.
Location
Develops, constructs, and operates utility‑scale renewable energy projects, primarily solar parks and battery storage systems. Activities include project design, engineering, construction, grid…
Serves UK businesses and corporate energy buyers, alongside landowners and farmers, investors, local communities and local authorities involved in utility-scale renewable energy projects.
Location
SUSTAINABLE SYSTEMS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops software platforms to support residential energy retrofit projects, including online hubs for resident engagement, tools for managing grant-funded programmes, and property data analysis…
Serves UK housing associations, local authorities, tier-one contractors, retrofit businesses and one-stop shops, plus homeowners and residents involved in grant-funded or self-funded home retrofit…
Financial Health
StrongStrong · 18% CAGR over 2y
Location
BEST ENERGY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and manufactures IoT-based energy monitoring and management systems for commercial buildings and multi-site businesses. Provides hardware and software platforms that collect energy data,…
Serves B2B and institutional clients with multi-site buildings, including quick-service restaurants, food retailers, commercial estates, education providers, manufacturers and hotels worldwide.
Financial Health
StableStable · -61% CAGR over 4y
Location
Anaphite Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDevelops technology for battery manufacturers to produce dry‑coated electrodes. Creates engineered dry coating precursor powders and provides formulation, testing and validation to support scalable…
Sells B2B to battery industry customers, including OEMs, cell manufacturers, equipment makers and material suppliers. Targets organisations developing or scaling dry electrode coating, from product…
Financial Health
StrongStrong · Growing, Hiring · 45% CAGR over 4y
Location
Develops, builds and operates renewable energy projects, primarily utility-scale solar parks and battery storage. Activities include site development with landowners, engineering and construction,…
Serves UK landowners and farmers, corporate energy buyers, investors, local communities and local authorities involved in utility-scale renewable energy projects and power purchasing.
Location
Lightsource bp
Develops, constructs and operates utility‑scale onshore renewable energy and energy storage projects, including solar and wind installations. Works with utilities, investors and businesses to deliver…
Serves investors, businesses, utilities, governments, landowners and local communities seeking utility-scale renewable energy and storage projects, power offtake, partnerships or land agreements…
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cloud software for renewable energy installers, including solar, heat pump, battery and EV charger companies. Platform offers CRM, quoting, job management, compliance documentation,…
Sells to UK B2B clean-tech installers, particularly solar, heat pump, battery storage and EV charger installation firms looking to manage growing project volumes, field teams and compliance…
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
Designs and supplies industrial energy efficiency and heat recovery technologies for boiler plants and steam systems, including steam traps, flue gas heat recovery units, cogeneration systems and…
Serves industrial and institutional organisations with boiler plant and steam operations, including food and beverage, pulp and paper, hospitals, pharmaceuticals, chemicals and petrochemicals, and…
Location
Develops, builds and operates renewable energy projects including utility-scale solar farms, wind installations and battery storage. Acts as an independent power producer, managing project design,…
Serves businesses, investors, landowners and farmers, plus local communities and local authorities in the UK. Targets corporate energy buyers through PPAs and organisations involved in utility-scale…
Location
ATMO TECHNOLOGY LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops environmental and safety monitoring software that collects and analyses site data such as noise, dust and air quality. Uses IoT sensors, AI and automation to track pollutants, manage…
Serves operations, HSE and compliance teams at infrastructure, construction, rail, logistics and industrial businesses managing multi-site worksites and environmental obligations.
Financial Health
StrongStrong · Growing, Hiring · 47% CAGR over 4y
Location
New Resource Partners Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides consultancy on energy systems and property decarbonisation, advising organisations on local energy asset development, energy cost management, and design of low‑carbon energy portfolios and…
Serves organisations managing property portfolios, local energy assets and city-scale energy programmes, including universities, property developers, foundations and local/public-sector stakeholders…
Financial Health
StableStable · Hiring · 19% CAGR over 4y
Location
TOUMETIS LTD
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsDevelops predictive analytics and machine learning software for electrical utilities. Its platform analyses power quality data to detect anomalies, classify event types, and locate incipient…
Sells to B2B electric utilities, power distribution companies and grid operators responsible for transmission and distribution reliability, asset maintenance, outage reduction and wildfire-risk…
Financial Health
StableStable · -7% CAGR over 6y
Location
DP Energy Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops large-scale renewable energy projects, including onshore and offshore wind, solar photovoltaic, and ocean energy such as wave and tidal. Also works on energy storage and hydrogen-based…
Serves B2B and public-sector energy buyers, including utilities, grid operators, large energy users, governments and Crown Estate-style leasing bodies involved in large-scale renewable energy and…
Financial Health
WeakWeak · -9% CAGR over 2y
Location
THE RENEWABLE EXCHANGE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsOperates an online marketplace for power purchase agreements (PPAs) connecting renewable energy generators with electricity buyers. Provides PPA price forecasting, tendering tools, market data, green…
Serves UK renewable energy generators, including asset owners and managers, farmers and landowners with single turbines, portfolio operators, and developers of new projects, plus energy offtakers…
Financial Health
HealthyHealthy
Location
ALMONDSBURY ECOHEAT LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs renewable heating systems including biomass boilers, air source heat pumps and heat recovery systems for domestic, agricultural and commercial properties. Also advises on system…
Serves homeowners, domestic property owners, commercial organisations and agricultural businesses seeking renewable heating systems, installation support and guidance on UK incentive eligibility.
Financial Health
WeakWeak · Hiring · 22% CAGR over 2y
Location
Develops, constructs and operates utility‑scale onshore renewable energy and energy storage projects, including solar and wind farms. Works with utilities, businesses, governments and investors to…
Serves utilities, large businesses, public sector bodies, investors, landowners and local communities seeking utility-scale renewable energy and storage partnerships across global markets.
Location
Lightsource bp
Develops, finances, constructs and operates utility‑scale solar energy and battery storage projects, generating renewable electricity and supplying power to utilities, businesses and energy markets…
Serves businesses, utilities, investors, governments, landowners and local communities globally that engage in utility-scale renewable energy, storage, power purchase or land partnership arrangements.
Location
GA DRILLING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops downhole drilling technologies including the NexTitan autonomous control, anchoring and drive system designed to improve deep drilling in hard rock. Solutions target geothermal, oil and gas,…
Serves B2B energy-sector customers, including geothermal developers, oil and gas operators, offshore well construction partners, and large energy consumers evaluating deep geothermal.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 4y
Location
Develops and invests in offshore wind energy projects, including floating and bottom‑fixed installations. Partners with local developers to originate, design and advance projects from early-stage…
Serves B2B energy-sector partners, particularly local offshore wind developers and strategic project partners, while engaging public leasing authorities, government stakeholders and local communities…
Location
Brick House Farm Solar Farm
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops and operates a utility-scale solar photovoltaic farm project, managing planning, construction and operation of solar power infrastructure and related community engagement for the Brick House…
Financial Health
WeakWeak
Location
Develops and invests in offshore wind energy projects, including floating and bottom-fixed installations. Works with local partners to originate, design and advance projects from early-stage…
Targets energy-sector partners, local offshore wind developers, utilities, investors and public bodies involved in large-scale renewable energy projects, especially in the UK, Spain, Italy and…
Location
Develops and deploys on-site fuel cell power systems that generate electricity for AI data centres. Provides modular, scalable power generation designed to deliver reliable energy supply independent…
Serves B2B customers building or operating AI datacenters, particularly infrastructure teams and developers needing scalable on-site power for large-scale computing facilities.
Location
Invests in and operates renewable energy assets including commercial-scale solar, wind, biomass and landfill gas. Also finances development of care homes, energy and property projects, and owns…
Serves UK businesses in energy, healthcare and property, including developers of care homes, energy sites, and residential or commercial properties.
Location
ALBRIGHTON BATTERY STORAGE LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsOwns and operates battery energy storage infrastructure used to store electricity from the power grid and renewable generation, providing grid balancing and energy storage services as part of a…
Serves investors seeking listed exposure to renewable energy infrastructure, including retail shareholders and institutional investors interested in long-term income and energy transition assets…
Financial Health
StableStable
Location
ARENA CAPITAL PARTNERS LIMITED
Trajectory
2y · 2019–NowFinancial sub-scores
Computed from 2 filingsOperates and owns wind power generation projects. Develops and manages wind farms and associated turbines, producing electricity from wind energy and overseeing the operation and asset management of…
Financial Health
WeakWeak
Location
PORT DUNDAS BATTERY STORAGE LIMITED
Trajectory
1y · 2025–NowDevelops, owns and operates renewable energy and energy storage infrastructure as part of an investment portfolio. Assets generate electricity and provide grid services, with projects managed to…
Serves retail and institutional investors seeking exposure to listed renewable energy infrastructure, with materials aimed at shareholders and prospective investors in permitted jurisdictions.
Financial Health
Insufficient historyInsufficient history
Location
YOUR ECO CONSTRUCTION LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs enterprise-scale solar photovoltaic and battery storage systems for commercial, agricultural and estate clients. Provides renewable energy integration for construction projects,…
Sells to organisations needing enterprise-scale solar and battery systems, including commercial businesses, agricultural enterprises, property estates, construction developers and contractors, and…
Financial Health
StrongStrong · Growing, Hiring · 51% CAGR over 4y
Location
Perceptual Robotics Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops autonomous drone systems and machine learning software for inspecting wind turbine blades. Provides aerial inspection services, AI‑based damage detection, data processing, and reporting…
Sells B2B to wind industry customers, including wind farm owners and operators, OEM procurement teams, independent service providers, drone companies, asset managers, and blade or wind farm managers…
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 5y
Location
High Voltage Grid Services Ltd
Trajectory
1y · 2025–NowProvides high‑voltage electrical engineering and contracting services for energy infrastructure, including design, procurement, and installation of grid connections up to 132kV. Delivers civil,…
Serves B2B renewable energy developers and operators, especially battery energy storage and solar projects, needing high-voltage grid connections with DNOs or National Grid in the UK.
Financial Health
Insufficient historyInsufficient history
Location
ENERGY AND TECHNICAL SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides energy management and engineering consultancy for buildings, including energy performance audits, HVAC design and review, building energy management systems (BEMS), smart building and IoT…
Sells to businesses and building operators seeking energy management and net zero support, particularly facility managers and decision-makers responsible for commercial buildings, plant and HVAC…
Financial Health
DistressedDistressed · -9% CAGR over 4y
Location
Clade Engineering
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures air source heat pumps using CO2 and propane refrigerants for commercial and industrial applications. Provides system design, supply, installation and maintenance of heat pump…
Serves commercial and industrial organisations, public and private sector estates, housing developers, social housing providers, offices, warehouses, data centres, swimming pools, retailers,…
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 2y
Location
Blackfish Engineering Design Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering design and development services for offshore renewable energy projects, including tidal, wave and offshore wind. Offers concept and detailed design, mechanical systems design,…
Serves B2B clients in the offshore renewable energy sector, including tidal stream, wave energy and offshore wind developers, technology companies and project teams in the UK and beyond.
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 4y
Location
WING TEK LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns wind‑assisted propulsion systems for commercial ships, including retrofit wingsail technology that uses wind power to supplement engine propulsion. Develops maritime engineering solutions…
Sells to B2B customers in commercial shipping, particularly ship owners and ship operators seeking retrofit decarbonisation solutions for existing commercial vessels in the global maritime sector.
Financial Health
WeakWeak · Hiring · 12% CAGR over 2y
Location
DRIFT ENERGY LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops maritime renewable energy systems using high‑performance sailing vessels equipped with underwater turbines and onboard storage to generate electricity at sea. Vessels harvest wind-driven…
Serves ports, fuel bunkering operators, maritime and shipping companies, co-located heavy industry, grid infrastructure buyers, and island nation governments.
Financial Health
HealthyHealthy · Hiring · 100% CAGR over 2y
Location
WINDHAGER UK LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides biomass heating systems including wood pellet, log and wood chip boilers, hybrid boilers, and air source heat pumps. Also supplies control systems, fuel storage, packaged plant rooms,…
Serves homeowners, commercial property owners and heating professionals seeking low-carbon heating systems, from domestic installations to large plant-room projects.
Financial Health
StableStable · Hiring · 3% CAGR over 4y
Location
Green Running Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops technology for peer‑to‑peer renewable energy trading, enabling households with solar panels to sell excess electricity directly to nearby consumers. Also designs and supplies energy‑related…
Serves households with excess solar energy and neighbouring residents, alongside partners in residential renewable energy, smart home and utilities markets.
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 4y
Location
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How Bristol cleantech companies work and how to sell to them
What they do
Bristol cleantech firms tend to monetise a mix of technical expertise, project delivery and recurring operational support. Revenue often starts with feasibility work, audits, paid pilots, site assessments or consultancy, then moves into installation margins, managed services, maintenance, monitoring and performance reporting. Product-led businesses may charge licence or subscription fees for software that tracks assets, energy use, emissions or resource flows, while infrastructure-adjacent operators may earn through service contracts or usage-linked arrangements. Engagements are usually scoped around a defined site, fleet, building, process or waste stream rather than a generic software seat.
Who they sell to
Most sell into operational buyers rather than sustainability teams alone. Typical sponsors include heads of operations, energy managers, estates and facilities leads, fleet managers, engineering directors, procurement teams and finance leaders who need a cost case as well as an environmental case. Customers are often small and lower mid-market businesses in energy, transport, waste, water, construction and industrial settings. Sales are commonly direct and evidence-led, with procurement shaped by pilot results, site constraints, safety requirements and payback assumptions. Advisory work can move more quickly; installation or infrastructure-linked contracts usually take longer.
What they buy
Most cleantech firms tend to spend on tools and services that make project work repeatable. Common needs include CRM, quoting, project management, field-service scheduling, asset maintenance, billing, accounting, contract management, cyber security, cloud hosting, data storage and analytics. Firms with monitoring or reporting propositions may also buy telemetry, data engineering, carbon accounting support and assurance services. On the services side, legal advice, insurance, health and safety consultancy, recruitment, bid writing and technical marketing are often relevant. Smaller teams usually value systems that reduce manual reporting and help commercial staff track pilots through to renewal or roll-out.
Why and how to sell to them
Cleantech buyers tend to evaluate suppliers when delivery complexity starts to outgrow founder-led processes. Signals include new commercial hires, a move from pilots into repeat contracts, expansion into additional sites, new asset ownership, partnership-led delivery, or heavier buyer scrutiny around evidence and reporting. Pain points are usually practical: proving savings, documenting emissions outcomes, passing procurement checks, managing installation risk and keeping cash tied to projects under control. Outbound works better when it links to these operating pressures, using category-specific language around payback, assurance, site delivery, compliance evidence and the cost of manual coordination.
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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