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Carbon and Climate Companies in Bristol: 25 Active Firms (2026)
Carbon and climate companies in Bristol measure, reduce and manage greenhouse-gas impacts for organisations across the city region.
Buying decisions tend to sit with sustainability, finance, estates and operational risk teams rather than a single software owner. Bristol-area suppliers therefore split across advisory work, carbon accounting, climate data, low-carbon project delivery and implementation support for asset owners. Engagements are usually scoped around a defined reporting need, decarbonisation plan or site-level intervention, with repeat work where measurement, procurement evidence or performance monitoring has to be refreshed. The commercial centre of gravity is small to mid-market: lean specialist teams selling to businesses, public-sector bodies and property or infrastructure owners that need emissions work translated into practical operating changes.
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Across Bristol, 25 carbon and climate companies are actively trading, making this a compact local cohort rather than a broad generalist services market. Reported employment totals 377 people, so the footprint is visible but still weighted towards specialist practices rather than large employers. The shape fits a city-region market where advisory, measurement and delivery work can sit close to public-sector procurement, property owners, infrastructure planning and local business networks. For researchers, the main point is density: Bristol has enough firms to show a distinct carbon and climate cluster, but not enough scale for every sub-category to be represented by multiple sizeable suppliers.
Carbon claims and climate-risk work sit in a market where evidence quality matters. Buyers often need audit trails for emissions assumptions, documented methodologies, supplier questionnaires and board-level reporting packs, even where the immediate purchase is framed as consultancy rather than compliance. That pushes Bristol suppliers towards mixed delivery models: advisory work to define the pathway, data work to quantify baselines, and project support to show progress after the plan is agreed. Market structure is also shaped by procurement caution, since public bodies and asset owners tend to prefer defensible calculations over broad sustainability language.
Buyer demand appears likely to favour firms that can connect measurement with implementation. Pure advisory work remains useful, but clients tend to ask for clearer links between emissions baselines, capital planning, procurement choices and operational change. The Bristol cohort looks relatively specialist, with few larger revenue businesses and a visible long tail of smaller operators, so consolidation or partnership-led delivery may matter more than standalone expansion. Climate-data capability may become more central where buyers need repeatable reporting, while project-delivery specialists may benefit when organisations move from target-setting into estates, energy and supply-chain actions.
25
Active firms
2026
1
Above £5M
reported revenue
4
Recent incorporations
incorporated since 2022
Key facts
About 4% of the trading cohort reports turnover above £5M (1 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 carbon and climate suppliers tend to sit close to energy use, procurement and climate-reporting workflows, rather than selling only to sustainability teams.
UK buyers often treat carbon-management work as an operational purchasing decision, because emissions measurement depends on usable activity and supplier information.
The segment covers measurement, reduction and management of greenhouse-gas impacts, so offers tend to combine advisory work with monitoring and reporting processes.
Top Bristol carbon and climate companies
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
ESOS Energy Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides energy auditing and consultancy services, including ESOS assessments, EPC and DEC certification, SECR reporting, and TM44 air‑conditioning inspections. Advises organisations on energy…
Serves educational institutions, commercial property owners and managers, and public sector bodies including local authorities and government organisations with energy, carbon and building compliance…
Financial Health
StrongStrong · Growing, Hiring · 17% CAGR over 4y
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
i3NetZero Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides consultancy on net zero and energy transition, including carbon accounting and greenhouse gas analysis, decarbonisation roadmaps, renewable energy integration, climate finance, and…
Serves governments, ministries and businesses seeking support with net zero, energy transition, ESG, climate risk and sustainability across operations and value chains.
Financial Health
StrongStrong
Location
VALUE OPTIMISED RETROFIT LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides building retrofit consultancy and project services including retrofit assessments, coordination and design for residential and commercial properties. Conducts energy and moisture modelling,…
Serves a mix of public sector, B2B and residential clients, including local authorities, housing providers, homeowners, businesses and organisations planning domestic or commercial retrofit…
Financial Health
StrongStrong
Location
Oakwood Project Consulting Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides sustainability and ESG consulting services, including ESG strategy development, double materiality assessments, climate risk analysis, carbon accounting, and net‑zero planning. Advises…
Serves large and Fortune 500 organisations worldwide, targeting boards, executives, sustainability, finance and compliance teams responsible for ESG, climate-risk, reporting and net-zero programmes.
Financial Health
DistressedDistressed · 0% CAGR over 4y
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
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
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
E3 Consulting Engineers LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides building services engineering design and consultancy for construction projects, focusing on low‑energy building systems, energy performance, and environmental design across mechanical,…
Serves B2B clients commissioning building projects, including property developers, architects, contractors and building owners seeking low-energy building design support.
Financial Health
WeakWeak · -6% CAGR over 2y
Location
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
Future Leap Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides sustainability consultancy and advisory services to help organisations plan and implement net zero strategies. Operates co‑working workspaces, media studios, meeting and event spaces, and…
Serves UK businesses and organisations pursuing net zero and sustainability goals, plus freelancers, teams and event organisers seeking sustainability-focused workspaces, meeting rooms and business…
Financial Health
HealthyHealthy
Location
Everoze Partners Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides technical and commercial consultancy for renewable energy, energy storage, hydrogen and energy flexibility projects. Services include strategy, due diligence, project development support,…
Serves B2B clients in the energy sector, including renewable energy, storage, hydrogen and flexibility companies, project developers, asset owners and investors. Targets major sector brands and…
Financial Health
StrongStrong · Profitable, Growing, Hiring · 44% CAGR over 4y
Location
Wellspring EOT Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides advisory services on agriculture, food systems and climate-related sectors. Conducts sector research, investment and technical assistance advisory, programme strategy and design, and…
Serves investors, donors and businesses focused on agriculture, forestry, food security, nutrition, climate and energy, particularly those deploying capital or programmes in emerging markets.
Financial Health
WeakWeak
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
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
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, 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
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
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
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
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
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 sustainability consulting for organisations, developments and buildings. Services include carbon measurement and decarbonisation strategies, climate resilience planning, circular economy…
Serves public sector and B2B organisations with sustainability priorities, including local authorities, cultural and heritage institutions, nature charities, research bodies, universities, museums…
Financial Health
StableStable · Hiring · 14% CAGR over 4y
Location
AVONBANK INVESTMENTS LIMITED
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsProvides sustainability and carbon management consulting, including greenhouse gas emissions inventories, product carbon footprinting, decarbonisation strategies, transition planning, and climate…
Serves B2B organisations from start-ups to multinational corporations, particularly sustainability, energy and compliance teams needing support with climate programmes, emissions reporting and…
Financial Health
StableStable
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
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
Abricon Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides environmental consultancy services including ecological and biodiversity surveys, bat and wildlife assessments, carbon and sustainability reporting, hydrology reports, environmental…
Serves B2B and public sector clients, including developers, planners, architects, homeowners, public authorities, property professionals, SMEs, manufacturers and larger corporates needing…
Financial Health
HealthyHealthy · -19% CAGR over 3y
Location
Pro-Cast Group Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides construction and retrofit contracting services for residential and social housing projects, including insulation, renewable energy installations, energy efficiency upgrades and…
Serves UK public and private sector clients, especially housing associations, local, Scottish and UK government bodies, and organisations managing social or affordable housing portfolios, plus…
Financial Health
WeakWeak · -7% CAGR over 3y
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
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How Bristol carbon and climate companies work and how to sell to them
What they do
Revenue usually comes from a blend of fixed-fee consulting, recurring monitoring work and project delivery margin. Advisory-led firms sell baselines, reduction plans, climate-risk assessments, reporting packs and supplier evidence; data-led firms may add licence or subscription income around emissions calculation, dashboards or portfolio tracking. Implementation work tends to be priced around a specific estate, asset class, procurement programme or operating process, so commercial value depends on repeatable methods rather than one-off reports alone. Retainers appear where clients need annual reporting cycles, procurement responses or progress checks, while smaller engagements often start as a diagnostic before expanding into measurement, governance and delivery support.
Who they sell to
Most sell into organisations with external reporting pressure, estate emissions or supply-chain scrutiny: mid-market companies, local authorities, public-sector bodies, infrastructure owners, housing and property groups, and professional services firms with client-facing sustainability commitments. The buying group typically spans a sustainability lead, finance owner, estates or operations director, procurement and, for risk work, legal or board sponsors. Private-sector sales are often relationship-led and proposal-based, with contracts moving from a scoped assessment into retained support. Public-sector and asset-owner work is more likely to involve framework purchasing, formal tenders or evidence-heavy evaluation, so credibility depends on methodology, delivery capacity and defensible outputs.
What they buy
Most Bristol carbon and climate firms tend to spend on tools and services that make small teams look disciplined to cautious buyers. Useful categories include pipeline management, proposal and bid software, project resourcing, time recording, document control, finance systems, professional indemnity advice, legal support for consultancy terms, and recruitment for analysts or project managers. Data-led suppliers may also need cloud hosting, data warehousing, security testing, geographic information systems, API management and quality assurance for calculation workflows. Marketing spend is usually better framed around trust-building content, partner channels and sector-specific case material than broad demand generation.
Why and how to sell to them
Buying triggers tend to be practical rather than speculative: a new reporting requirement, a move from advisory into recurring software or data services, a public-sector tender pipeline, headcount growth, or a larger client asking for audit trails and delivery assurance. With only 1 Bristol carbon and climate firm above £5M turnover, many prospects will be cost-conscious and reluctant to add process for its own sake. Outbound messages therefore need to connect the offer to recoverable billable time, tender win rates, lower delivery risk or faster evidence production. Sector fluency matters; generic sustainability language is less persuasive than showing how the vendor supports scoped client work.
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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