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Renewable Energy Companies in Cardiff: 69 Active Firms (2026)
Renewable energy companies in Cardiff develop, finance and operate low-carbon power assets across the city’s surrounding metropolitan area.
Buying centres tend to sit with asset owners, local authorities, utilities, commercial estates and infrastructure managers rather than individual consumers. Cardiff operators usually sell project development, engineering, asset-management, grid-connection or energy-market services, with procurement shaped by site control, planning risk, power-purchase arrangements and compliance obligations. Engagements are typically project mandates, operating contracts or financing partnerships rather than transactional software-style sales. The better-fit suppliers are commercially established, mid-market businesses able to manage counterparties and technical delivery, while still specialising around particular asset types, customer segments or parts of the electricity value chain.
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Cardiff has 69 actively trading renewable energy companies in this list, a small metropolitan cohort rather than a broad regional market in its own right. Companies reporting staff employ 990 people between them. That points to a market made up of project developers, operators and specialist services firms with some delivery capacity, alongside smaller corporate entities used for asset ownership or development pipelines. Revenue is likely to be concentrated among a limited group of operating or services businesses rather than spread evenly across the list.
Generating, moving or supplying energy in Great Britain can bring a Cardiff operator within Ofgem’s licensing framework. Once licensed, firms must meet standard licence conditions and, where imposed, special conditions tied to their activity. The Renewables Obligation is now a closed support mechanism for new generating capacity, but accredited stations remain exposed to audit, compliance checks and generation reporting for Renewables Obligation Certificates. That matters for local developers and asset operators because the compliance burden sits alongside planning, grid-connection and offtake work, rather than after the project has been built. RenewableUK remains the relevant trade body for renewable electricity deployment and export policy.
Cardiff’s renewable-energy base appears to be more delivery-led than platform-led, with commercial progress tied to permissions, grid access, counterparties and asset-level financing. That tends to favour firms with engineering depth, balance-sheet access or repeat public and commercial customers, while leaving thinner developers exposed to long sales cycles and changing connection queues. Consolidation is plausible where small asset vehicles, services providers and developers need scale to bid for work or manage compliance. The sector also has a local infrastructure character: growth depends less on brand reach than on investable sites, grid availability and the ability to hold projects through development risk.
69
Active firms
2026
10
£5M-plus firms
Reported turnover above £5M
10
Newer incorporations
Incorporated since 2022
Key facts
About 14% of the trading cohort reports turnover above £5M (10 of 69 firms) — the rest sits below that revenue band.
14% of the cohort was incorporated since 2022 (10 firms), so a sizeable share is in its first few filing cycles.
Renewable-energy businesses that generate, move or supply energy in Great Britain need an Ofgem licence and must comply with standard and any special licence conditions once granted.
The Renewables Obligation is closed to all new generating capacity, while accredited stations remain subject to Ofgem audit and compliance checks and must submit generation data for Renewables Obligation Certificates.
UK renewables generated 50.8% of UK electricity in 2024, up from 46.4% in 2023, with output rising from 135.8 TWh to 144.7 TWh.
Wind accounted for 29.5% of UK electricity generation in 2024, split between 17.2% offshore wind and 12.3% onshore wind.
The IEA expects annual renewable capacity additions to rise from 666 GW in 2024 to almost 935 GW in 2030, with solar PV and wind forecast to account for 95% of additions.
Top Cardiff Renewable Energy companies
Trajectory
2y · 2021–NowFinancial sub-scores
Computed from 2 filingsDevelops renewable energy projects, focusing on onshore wind farms and solar generation. Plans and promotes proposed wind farm sites, secures investment, and manages project development through…
Financial Health
StrongStrong
Location
TRYDAN GWYRDD CYMRU LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops and delivers renewable energy generation projects, including onshore wind farms, solar farms and battery energy storage systems. Works with public sector partners and stakeholders to plan,…
Serves Welsh public sector bodies, local communities and stakeholders involved in public-estate renewable energy projects, with benefits intended for people living and working across Wales.
Financial Health
HealthyHealthy · Hiring · 80% CAGR over 1y
Location
Develops and promotes onshore wind energy parks. Plans and manages renewable energy projects, including site development, consultation and planning applications, to generate electricity from wind and…
Serves energy-sector and public stakeholders in Wales, including local communities, groups and services involved in renewable energy parks, community benefit funding and decarbonisation projects.
Location
2 Degrees Kelvin Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides engineering consultancy and technical services for utility‑scale solar photovoltaic projects, including design and development advisory, construction management, inspection and testing,…
Serves B2B clients involved in utility-scale solar PV assets, including developers, asset owners, investors, EPC/construction partners and operators across design, construction, commissioning,…
Financial Health
StrongStrong · Growing, Hiring · 34% CAGR over 3y
Location
WP GRID STORAGE 5 LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops, constructs and manages distributed energy assets including gas‑fired peaking plants, grid stability infrastructure and battery storage projects, providing flexible power generation and…
Serves B2B energy asset owners, developers and infrastructure investors with flexible generation, grid stability and battery projects for electricity networks across the UK.
Financial Health
StableStable
Location
Ashp Asset Management Ltd
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides consultancy, design, funding and installation of renewable energy systems including air source heat pumps, solar PV with battery storage, EV charging points, and energy management platforms,…
Serves B2B and public sector buyers, particularly housing associations, local authorities, property developers, architects, consultancies, and other commercial and not-for-profit organisations…
Financial Health
WeakWeak
Location
Nu Asset Capital Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDesigns, installs and maintains commercial renewable energy systems including solar PV arrays, battery storage and electric vehicle charging infrastructure. Provides consultancy, system integration…
Serves UK businesses and commercial property operators pursuing low-carbon energy projects, plus organisations needing commercial, public or domestic EV charging facilities and EPC contractors in…
Financial Health
StableStable
Location
Nuvolt Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs commercial renewable energy systems including solar PV, battery storage and electric vehicle charging infrastructure. Provides consultancy, system design, installation and…
Serves UK businesses, commercial property operators, EPC contractors, and organisations with commercial, domestic or public charging facilities seeking low-carbon energy infrastructure.
Financial Health
StrongStrong · Hiring · 73% CAGR over 2y
Location
Ecogen Innovations Ltd
Trajectory
1y · 2025–NowDevelops renewable energy systems including waste-to-energy plants that convert municipal waste into electricity, hybrid solar‑wind microgrids with battery storage, modular off‑grid power units, and…
Serves government agencies, municipalities, hospitals, community leaders and businesses needing clean energy infrastructure, including towns, industries, remote or off-grid communities, disaster…
Financial Health
Insufficient historyInsufficient history
Location
Sustainable Energy
Provides engineering and consultancy services for renewable and low‑carbon energy systems, including district heating and decentralised energy networks. Services cover energy masterplanning,…
Serves public sector bodies, large utility companies and organisations developing renewable, low-carbon and district heating projects across the UK, including decentralised energy and…
Location
Resolve Bioenergy Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides consultancy, operational support and maintenance services for biogas and anaerobic digestion plants, including performance optimisation, asset management, monitoring and reporting,…
Serves owners, operators and investors of biogas and anaerobic digestion plants, including privately owned and investor-owned sites.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
ECO2 MANAGEMENT SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides asset management and development services for renewable energy projects, including biomass, wind, solar and anaerobic digestion plants. Services include operational and financial management,…
Serves renewable energy asset owners and investors, including UK investment funds, large portfolio holders and small operators of biomass, wind, solar and anaerobic digestion assets.
Financial Health
StableStable · -63% CAGR over 4y
Location
SERO LIFE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides retrofit and energy services for social housing, installing technologies such as solar panels and batteries, aggregating homes to purchase electricity and participate in flexibility markets,…
Serves UK social housing landlords and their residents, alongside institutional investors and funders focused on climate and social-impact opportunities in housing retrofit and energy efficiency.
Financial Health
StrongStrong · Hiring · 47% CAGR over 4y
Location
Ges Green Solar Company (UK) Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs solar photovoltaic systems for residential and commercial properties. Provides solar panel installation, battery storage integration, system monitoring, maintenance and repair…
Serves homeowners, domestic energy users and commercial property owners across Cardiff, Newport, Swansea, South Wales and Bristol, including participants in Wales’ Switch Together scheme.
Financial Health
StrongStrong · Growing, Hiring · 35% CAGR over 2y
Location
Orion TS Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including design, installation and maintenance of electrical systems. Offers EICR inspections, structured cabling, commercial solar installations, EV charging…
Serves businesses, landlords, homeowners and public-sector organisations across South Wales and the UK, including retail, healthcare, education, HMO and commercial property clients.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
AMSER RENEWABLES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs renewable and energy‑efficient building systems, including solar photovoltaic and solar thermal systems, heat pumps, underfloor heating, biomass boilers, combined heat and power…
Serves businesses and organisations needing renewable and building services, including construction contractors, property developers, housing providers, education sites and public-sector clients,…
Financial Health
StrongStrong
Location
ARC ELECTRICAL SYSTEMS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical design, installation and maintenance for domestic, commercial and industrial properties. Offers inspection and testing, fire alarm and access control systems, solar PV…
Serves a mix of B2C, B2B and public-sector customers in South Wales, including homeowners, private customers, workplaces, landlords, letting agents, local authorities and small to medium industrial…
Financial Health
StrongStrong
Location
GREEN FROG POWER LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsBuilds and operates fast‑start power stations supplying standby and peak electricity to the national grid. Develops and delivers power generation projects including gas‑fuelled peaking plants and…
Sells to National Grid and UK wholesale energy-market counterparties, serving grid operators and electricity-market buyers that require standby generation capacity.
Financial Health
WeakWeak · Hiring · 12% CAGR over 3y
Location
Provides energy infrastructure, smart metering installation and management, and gas and electricity data services. Also delivers energy management, demand flexibility and project delivery services to…
Serves UK energy suppliers, utilities, industrial and commercial organisations, public sector bodies and domestic consumers involved in energy generation, supply and consumption.
Location
Vision Clean Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsInvests in and develops clean energy and waste conversion technologies through subsidiary companies, including facilities that convert waste plastic into fuels and hydrogen and development of…
Serves investors and partners interested in clean-economy technologies, and B2B markets in waste management, recycling, energy and industrial power seeking plastic conversion and hydrogen fuel cell…
Financial Health
DistressedDistressed · -18% CAGR over 4y
Location
Avantis Group
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides engineering, project management, and installation services for maintenance, upgrade, and life‑extension of industrial and marine assets. Activities include design, prefabrication, mechanical…
Serves B2B asset owners and operators in marine transportation, offshore oil and gas, power generation, renewables, industrial and utilities sectors with critical infrastructure and asset…
Financial Health
StableStable · Hiring · 21% CAGR over 1y
Location
CAP SOLAR PARTNERS LIMITED
Trajectory
3y · 2021–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures flexible solar panels and onboard solar power systems for vehicles including trucks, vans, boats and recreational vehicles. Provides custom integration, engineering and…
Serves B2B customers in mobility sectors, including transport and logistics fleets, boat builders/operators, recreational vehicle users, and custom van conversion companies needing on-board solar…
Financial Health
StrongStrong · Profitable, Growing, Hiring · 91% CAGR over 3y
Location
Eden Lotus Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong · Growing, Hiring · 73% CAGR over 2y
Location
SOLARIS INDUSTRIES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides solar panel installation for commercial, industrial and utility-scale projects, including rooftop and ground-mounted systems. Manufactures solar mounting structures, strut channels and metal…
Serves commercial and industrial businesses, utility-scale solar developers, housing societies, fleet operators, and construction or infrastructure firms in sectors such as PEB, highways, roofing and…
Financial Health
StableStable · 0% CAGR over 4y
Location
GB-SOL LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures solar photovoltaic panels and roof‑integrated solar systems including solar slates and full‑roof PV coverings. Provides mounting systems, battery storage integration, and installation…
Serves homeowners, architects, developers, commercial building owners, industrial operators, social housing providers and marine customers across Great Britain.
Financial Health
HealthyHealthy · -1% CAGR over 4y
Location
Bryn Power Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOperates anaerobic digestion facilities that process food waste and cattle slurry to produce biogas, generating renewable electricity and heat. Produces digestate biofertiliser and uses biomass…
Serves commercial and organisational food-waste producers across South Wales needing disposal routes, with renewable power supplied to the national grid.
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
Infinite Renewables Wales Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDesigns, develops and manages renewable energy projects including wind, solar and battery storage systems. Supplies wind turbines and microgrid solutions, and provides consultancy, asset management,…
Serves businesses and organisations seeking renewable energy infrastructure, including industrial sites, sustainability teams, remote or off-grid operators, and international project partners.
Financial Health
WeakWeak · 0% CAGR over 1y
Location
Tim O'Brien (Newport) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical and electrical contracting services and renewable energy installations, including solar PV, battery storage and EV charging systems, for commercial, social housing, local…
Serves commercial clients, social housing providers, local authorities, education bodies and construction firms in South Wales and South West England.
Financial Health
StableStable · 0% CAGR over 2y
Location
Gensol Engineering Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering, procurement and construction services for solar power projects, including design, installation and operations. Develops solar tracking systems and offers electric vehicle…
Serves businesses, utilities and public-sector buyers developing clean energy infrastructure, including solar project owners, commercial and industrial energy users, EV fleet operators, and…
Financial Health
WeakWeak · -11% CAGR over 4y
Location
Bryn Recycling Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOperates waste management and recycling facilities handling non‑hazardous construction and municipal waste, sorting materials for reuse and energy recovery. Produces recycled aggregates and quarried…
Serves local councils, utility companies, construction industry buyers, businesses, communities and private customers in South Wales, combining public-sector and commercial contracts with public site…
Financial Health
WeakWeak · Hiring · 5% CAGR over 2y
Location
TEWDRIC ENERGY CYMRU LTD
Trajectory
1y · 2025–NowDesigns and installs solar photovoltaic (PV) systems, battery energy storage, and electric vehicle charging points for homes, businesses, and community projects, providing on‑site renewable…
Serves homeowners, businesses, councils, housing associations and local community groups across South Wales seeking solar, battery storage and EV charging solutions.
Financial Health
Insufficient historyInsufficient history
Location
BIPV LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures building‑integrated photovoltaic systems, including flexible thin‑film and semi‑flexible solar modules and solar roof tiles designed for integration with roofing systems. Supplies solar…
Serves architects, developers, roofing contractors and building owners in commercial, industrial and residential projects, plus modular builders and operators of fleets, leisure vehicles, carports…
Financial Health
WeakWeak · -63% CAGR over 4y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops, delivers and operates grid-scale battery energy storage systems (BESS). Procures and manages fast-response storage projects that store electricity and provide grid-balancing services,…
Serves UK power-sector stakeholders, infrastructure investors and mixed-use development partners involved in grid-scale battery storage, private-wire, micro-grid and EV charging projects.
Financial Health
WeakWeak
Location
SURGE ELECTRICAL ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical engineering services including system design, installation, testing and maintenance. Services cover electrical installations, EICR inspections, EV charge point…
Serves commercial and industrial organisations across the UK, including education, healthcare, housing associations, facilities management, network operators, public sector bodies, retail, sport, and…
Financial Health
StrongStrong · Hiring · 6% CAGR over 4y
Location
ARC Electrical Engineering Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical engineering services including design, installation and maintenance for domestic, commercial and industrial systems. Conducts electrical inspection and testing, installs solar PV…
Serves domestic, commercial and industrial customers in South Wales, including local authorities, landlords, letting agents, private homeowners and workplaces.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
Tillott Renewable Contracting Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides solar energy installation services for renewable projects, installing photovoltaic systems on ground-mounted arrays, rooftops, carports and floating structures. Handles site setup and…
Serves commercial and utility-scale solar project owners, developers and contractors across the UK, including clients with ground, rooftop, carport or floating solar sites.
Financial Health
HealthyHealthy · Hiring · 73% CAGR over 4y
Location
Fonicy Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs solar photovoltaic panels, battery storage systems, and electric vehicle charging points for residential, commercial, and industrial properties, and undertakes commercial…
Serves residential homeowners and commercial or industrial clients in Wales and West England seeking renewable energy upgrades for properties, business premises, roof space, or EV charging needs.
Financial Health
StrongStrong
Location
MODERN ENERGY AND ELECTRICAL SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls and maintains solar energy systems, battery storage and electrical installations for residential, commercial and industrial properties. Provides electrical contracting, renewable energy…
Serves homeowners, commercial businesses and industrial clients seeking renewable and electrical project support, with stated coverage across South Wales, the West and nationwide.
Financial Health
StrongStrong
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops integrated renewable energy systems including wind, solar and anaerobic digestion projects. Manufactures and supplies low‑carbon cementitious materials, including supplementary cementitious…
Serves concrete product manufacturers and construction projects across the UK, plus stakeholders, schools and local communities connected to renewable energy developments in Wales.
Financial Health
StableStable · -66% CAGR over 4y
Location
HIGHADMIT PROJECTS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical contracting services for commercial and public sector building projects, including system design, BIM coordination, installation and maintenance. Installs building…
Serves public- and private-sector organisations across the UK needing large, medium or small building projects, including education, police, transport, hospitality, student accommodation and…
Financial Health
StableStable · -4% CAGR over 4y
Location
GIBSON SPECIALIST TECHNICAL SERVICES LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides installation, design, and servicing of heating and energy systems, including commercial and domestic heating, solar photovoltaic and solar thermal systems, heat pumps, and insulation.…
Serves housing associations, local councils, Welsh Government bodies, universities and social housing organisations across Wales, mainly public-sector and B2B clients managing housing and estate…
Financial Health
StableStable · 0% CAGR over 3y
Location
David Knight Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides land management and contracting services for renewable energy, agricultural and commercial sites. Activities include solar farm maintenance, panel cleaning, vegetation control, groundworks…
Serves renewable energy site owners/operators, farms, estates and commercial land/development clients across the UK, including organisations managing solar farms, wind/AD sites, agricultural land and…
Financial Health
StrongStrong · Growing, Hiring · 13% CAGR over 4y
Location
RCJ Electrical Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for domestic, commercial and industrial projects, including system design, installation and maintenance. Installs solar photovoltaic and battery storage…
Sells to homeowners and businesses needing electrical, solar, battery storage, EV charging and maintenance services, including domestic, commercial and industrial clients. Serves property and project…
Financial Health
StrongStrong · Hiring · 14% CAGR over 4y
Location
INTERLEC SYSTEMS (NEWPORT) LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical installation and maintenance for domestic, commercial and industrial properties, including rewiring, fixed wire testing, data networks, fire alarms, security and CCTV systems,…
Serves domestic homeowners and landlords, plus commercial and industrial clients in South Wales, including care homes, healthcare, offices, commercial property, student accommodation and education.
Financial Health
StableStable · 0% CAGR over 2y
Location
WOODLAND BUILDING & ELECTRICAL SERVICES BARRY LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial electrical and building services, including electrical installation, maintenance and system upgrades for business premises, as well as MCS-certified solar panel and renewable…
Serves businesses of all sizes and commercial property clients across South Wales, including organisations needing building, electrical and renewable energy support for their premises.
Financial Health
WeakWeak · -7% CAGR over 3y
Location
EFS Systems (Uk) Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services for commercial, industrial and domestic clients, including installation and maintenance of solar PV systems, EV charging infrastructure, electrical…
Serves B2B, public-sector and residential customers: commercial and industrial premises, SMEs, NHS/hospital estates teams, organisations requiring security systems, and homeowners, with South Wales…
Financial Health
HealthyHealthy · -3% CAGR over 2y
Location
Green World Electrical and Renewable Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering and design services for solar energy and EV charging projects, including solar permit plan sets, electrical and structural stamping, proposal design, site surveys, shade…
Targets homeowners, commercial businesses, solar developers/installers, EV charging project owners and utility-scale renewable energy projects, with stated markets in the USA and UK plus projects in…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
G24 POWER LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures dye‑sensitised solar cells (DSSC) that convert ambient light into electrical energy. Produces thin, flexible photovoltaic modules using roll‑to‑roll manufacturing for…
Sells to global OEMs and product manufacturers, particularly in portable consumer electronics, wireless sensors and actuators, retail display systems, and other indoor electronic or battery-powered…
Financial Health
WeakWeak · -62% CAGR over 5y
Location
Laver Group Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides heating, electrical, and renewable energy installation and maintenance services. Installs solar PV and battery storage, heat pumps, EV charging points, smart meters and thermostats, and…
Serves domestic homeowners, public sector bodies and private sector businesses seeking low-carbon heating, electrical and renewable energy support, including decarbonisation and home energy upgrades.
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
Off Grid Engineering Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs off‑grid power systems using solar PV, battery storage and generators. Provides system design, turnkey installation, upgrades, and remote monitoring for homes, businesses and…
Serves homeowners, self-builders and rural property owners, plus businesses with remote sites such as workshops, holiday lodges and commercial premises needing off-grid power systems.
Financial Health
StableStable · 0% CAGR over 4y
Location
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How Cardiff Renewable Energy companies work and how to sell to them
What they do
Cardiff renewable-energy firms usually monetise work at project or asset level: development fees for taking a site through consent and grid-connection work, engineering margins on design and delivery, operating retainers for asset management, and success-based income linked to financing or offtake. Some entities may hold generation or storage assets and earn through power sales, support-certificate administration or energy-market participation, while services firms sell expertise into those assets. Pricing is therefore often milestone-led, retainer-based or percentage-of-project-value, with risk shared through break fees, availability guarantees or performance-linked service levels. Cash conversion can be lumpy because revenue follows permissions and counterparty approvals.
Who they sell to
Buyers are typically infrastructure-literate organisations rather than household consumers. A Cardiff developer may deal with utility procurement teams, council estates departments, commercial landlords, industrial energy managers, landowners and funders; a services firm may sell into the same projects through the main contractor, asset owner or operator. Decision-makers tend to include development directors, CFOs, grid-connection managers, sustainability leads, heads of estates, legal counsel and procurement. Larger mandates normally move through direct relationship selling, framework agreements or formal tenders, with technical due diligence and legal review before signature. Smaller advisory or monitoring engagements can start faster, but still depend on site status and internal approvals.
What they buy
Most renewable-energy firms tend to spend on inputs that reduce project risk or keep assets earning: planning advice, environmental surveys, land and property legal work, grid studies, financial modelling, insurance, metering, monitoring, maintenance scheduling and asset-performance analytics. Operators with licences or legacy support obligations also need compliance workflow tools, audit preparation, generation reporting support and document control. Commercial teams may buy CRM, bid management, procurement systems, contract management and market-intelligence services, while finance teams often need project accounting, debt reporting and cash-flow forecasting. Recruitment, specialist engineering contractors and health-and-safety training are common needs where delivery capacity is the constraint.
Why and how to sell to them
Sales timing usually improves when a firm has secured a site option, received a grid offer, entered a tender, taken on an operating asset, refinanced a portfolio or moved from development-only work into recurring operations. The 10 Cardiff firms above £5M turnover are likely to have more formal procurement and budget ownership than very small asset vehicles, but most buyers still expect sector fluency. Useful outbound angles tend to quantify avoided delay, lower compliance effort, better asset availability or reduced financing friction. Generic sustainability messaging is weaker than showing how the offer fits planning milestones, Ofgem obligations, offtake negotiations or contractor control.
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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