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Renewable Energy Companies in Swansea: 29 Active Firms (2026)
Renewable energy companies generate, develop, install or manage low-carbon power assets across Swansea and its surrounding metropolitan area.
Buying decisions usually sit with estates, facilities, construction, asset-management and energy-procurement teams rather than a single green-technology budget. Local suppliers tend to sell to commercial landlords, public-sector sites, industrial operators and project developers, with work framed around feasibility, installation, maintenance, grid connection or ongoing asset management. Engagements are often project-based, with compliance and safety requirements sitting alongside price and delivery risk. The clearer Swansea fits are likely to show evidence of recurring operations or regulated market participation, not just one-off installation work, which helps separate operating businesses from lightly trading renewables shells.
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Swansea is a compact local market for this classification: 29 companies are actively trading, and 3 have turnover above £5M. Reported employment totals 194 people across the cohort, giving the list a small-company bias even where firms have reached project-delivery scale. Only 1 entrant was incorporated since 2022, so recent formation is not the main story here. The practical footprint appears to sit in operating, installation and services businesses that have already found local commercial demand.
Businesses that generate, move or supply energy in Great Britain sit within Ofgem’s licensing framework rather than a purely local permitting market. A licence brings standard conditions, and sometimes special conditions, around how the activity is carried out. The Swansea cohort therefore straddles project delivery and regulated energy-market operation: contractors and service firms deal with construction, safety and connection obligations, while generators or suppliers face direct energy-market compliance. The Renewables Obligation is now a legacy support scheme; accredited stations still face audit checks and generation-submission duties for certificates. RenewableUK’s role as a trade body adds an industry-policy channel around deployment and export activity.
The Swansea market appears likely to remain project-led, with local demand tied to asset refurbishment, rooftop and onsite generation, grid-connection work and compliance administration. The scarcity of higher-turnover businesses points to a cohort where specialist contractors and smaller operators matter more than platform-scale generation. Consolidation may come through service-line extension rather than headline mergers: electrical, building-services and energy-management firms can add renewable capability as clients push estates towards lower-carbon power. Firms with clearer regulatory processes and repeat maintenance revenue tend to have an easier path to durable margins than businesses reliant on occasional installation work.
29
Active firms
2026
3
Over £5M turnover
Larger revenue operators
1
New since 2022
Recent incorporations
Key facts
About 10% of the trading cohort reports turnover above £5M (3 of 29 firms) — the rest sits below that revenue band.
3% of the cohort was incorporated since 2022 (1 firms), so a sizeable share is in its first few filing cycles.
Ofgem licensing applies where renewable-energy businesses generate, move or supply energy in Great Britain, with standard and any special licence conditions once granted.
The Renewables Obligation is closed to all new generating capacity, although accredited stations still face audit and compliance checks and must submit generation data for certificates.
UK renewables generated 50.8% of electricity in 2024, up from 46.4% in 2023, with renewable output reaching 144.7 terawatt hours.
Wind accounted for 29.5% of UK electricity generation in 2024, split between 17.2% offshore wind and 12.3% onshore wind.
The IEA’s Renewables 2024 outlook says annual renewable capacity additions 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 Swansea Renewable Energy companies
A. LLOYD ELECTRICAL & SOLAR LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs solar photovoltaic (PV) systems and battery storage for residential and commercial properties. Provides electrical contracting services, including system design, installation,…
Serves homeowners and commercial customers in South Wales, including medical practices, churches, farms, factories and sites needing ground-mounted or off-grid solar systems.
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
MARINE POWER SYSTEMS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and develops floating platform technology for deep-water offshore wind farms. Manufactures modular structures that support offshore wind turbines and enable deployment of large-scale wind…
Serves offshore wind developers, renewable energy companies and infrastructure project partners pursuing industrial-scale deep-water wind projects.
Financial Health
StableStable · -62% CAGR over 4y
Location
WIND TURBINE ENGINEERING UK LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical engineering and crane services for the wind turbine industry, including turbine erection, maintenance, repair and retrofit, and major component replacement such as gearboxes,…
Serves B2B customers in the wind energy sector, including wind farm owners, operators and turbine service providers across Ireland, the UK and Europe.
Financial Health
StableStable · Hiring · 114% CAGR over 4y
Location
Swalek Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides high‑voltage electrical engineering services including substation design and construction, cable installation and jointing, testing and commissioning, earthing design and installation,…
Sells to B2B operators of private high-voltage electrical networks, including wind and solar farms and industrial, petrochemical and healthcare sites, needing maintenance, installation, testing and…
Financial Health
StrongStrong · Hiring · 73% CAGR over 4y
Location
TAYLORS CROSS WIND ENERGY LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical engineering services including electrical system design and installation, high‑ and low‑voltage works, cable laying and jointing, wind turbine maintenance, rope access works, and…
Serves UK businesses and organisations needing specialist electrical engineering support, including wind energy operators, sites with HV/LV infrastructure, and clients installing EV charging or cable…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
PRAISEWORTHY APPAREL LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical engineering services including electrical system design and installation, high‑ and low‑voltage works, cable laying and jointing, wind turbine maintenance, rope access electrical…
Serves UK businesses and organisations, particularly industrial sites, renewable energy operators, utilities and infrastructure projects needing specialist electrical engineering support.
Financial Health
DistressedDistressed
Location
Lighthouse Electrical Services Direct Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including installation of CCTV systems, photovoltaic solar panels, intruder and fire alarms. Also carries out rewiring, fault finding and consumer unit…
Serves domestic, commercial and industrial customers in South Wales, including homeowners, businesses and industrial sites needing electrical, CCTV, alarm and solar-related services.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
MIRUS ENERGY (CYMRU) LTD (FORMERLY ASHLEY JAMES (SOUTH) LTD)
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides electrical installation and compliance services including fixed wire testing (EICR), solar PV installation, domestic ventilation systems, environmental monitoring, fire and carbon monoxide…
Serves social housing providers, residential new-build developers, commercial fit-out contractors, government bodies and MoD clients needing electrical compliance and installation support across the…
Financial Health
HealthyHealthy · -33% CAGR over 1y
Location
Celtic Green Energy Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsInstalls solar photovoltaic systems, battery storage, heat pumps and electric vehicle charging points for residential, agricultural and commercial properties. Provides system design, installation,…
Serves homeowners, farms and businesses across Wales, including domestic and commercial customers seeking solar, heat pump, battery storage and EV charging solutions.
Financial Health
StrongStrong · Growing, Hiring · 25% CAGR over 5y
Location
AWRB SOLAR & STORAGE SOLUTIONS LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides solar energy installation services for residential and commercial properties, including design and installation of solar panel systems, supply of solar equipment, and integration of battery…
Serves homeowners and businesses in South Wales seeking solar energy installations, battery storage, and solar equipment supply.
Financial Health
DistressedDistressed · 0% CAGR over 1y
Location
RHW RENEWABLE HEATING WALES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsInstalls renewable and energy‑efficient heating and power systems for homes and businesses, including solar PV panels, battery storage, air and ground source heat pumps, boilers, insulation,…
Serves homeowners across South Wales seeking lower energy bills, plus commercial premises needing large-scale heating. Also targets households eligible for ECO4, GBIS, LA Flex and boiler upgrade…
Financial Health
WeakWeak · 0% CAGR over 2y
Location
Parc Ynni Cymunedol Alwen Cyfyngedig
Generates electricity and develops power projects using offshore and onshore wind, solar, hydro, biomass and gas plants. Also engages in energy trading, and provides engineering and project…
Serves the UK energy market, selling mainly B2B to electricity suppliers, traders and large power purchasers, with public-sector and community stakeholders around energy projects.
Financial Health
Insufficient historyInsufficient history
Location
SURESERVE ENERGY SERVICES WALES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides energy and compliance services for social housing providers, including retrofit planning, insulation, solar and renewable heating installation, ventilation, and decarbonisation consultancy,…
Serves housing associations, local authorities and public-sector social housing providers managing residential stock, with support for residents in those homes.
Financial Health
StableStable · -57% CAGR over 4y
Location
Power On Demand Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides consultancy, design, and installation for low‑carbon and energy‑efficiency projects. Supplies and imports energy‑saving technologies, and manages project delivery, DNO applications,…
Serves B2B and institutional clients, including large manufacturing plants, commercial offices, hospitals and facilities management companies seeking low-carbon energy projects, with projects…
Financial Health
StrongStrong · Growing · 0% CAGR over 5y
Location
Williams Electrical Contractors (Cymru) Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical engineering and contracting services including design, installation, testing and commissioning of electrical systems. Works on domestic, commercial and industrial projects, and…
Serves building contractors and property developers in Wales, plus domestic and commercial customers seeking solar, and organisations in social housing, rail, pharmaceutical, military, industrial and…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
Tlporter Electrical Contractor Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including installation and maintenance of solar panel systems, air source heat pumps and other renewable energy equipment. Also installs CCTV, control panels,…
Serves homeowners and commercial organisations needing electrical and renewable energy installations, servicing and maintenance, mainly in Llanelli, South Wales and across the UK where requested.
Financial Health
DistressedDistressed
Location
Protium Green Hydrogen Supply Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProduces, stores and distributes green hydrogen and develops hydrogen supply projects. Provides commercial development and technical services for hydrogen production, storage and deployment for…
Serves UK businesses and public sector partners in construction, manufacturing, transport, energy-intensive industry, events, temporary infrastructure and critical infrastructure seeking low-carbon…
Financial Health
DistressedDistressed
Location
OCTOPUS (UK) LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsSupplies electricity and gas to households and businesses, offering variable and smart energy tariffs. Provides installation and financing for low‑carbon technologies including heat pumps, solar…
Targets B2C customers across the UK: households, homeowners and renters, including consumers with electric vehicles, heat pumps, solar panels or home batteries seeking domestic energy tariffs.
Financial Health
StableStable · Hiring · 8% CAGR over 4y
Location
A M Power Solutions Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs off‑grid power systems including solar PV arrays, battery storage and generators for farms and rural businesses. Provides generator supply, installation and servicing, farm…
Serves farms, rural businesses and commercial operators across the UK, including private hospitals, care homes, hotels, utilities and local authorities needing dependable off-grid or backup power…
Financial Health
StableStable · Hiring · 22% CAGR over 2y
Location
Energy And Leisure Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides energy consultancy and decarbonisation services for leisure centres and public‑sector sports facilities. Conducts energy surveys and feasibility studies, prepares funding applications, and…
Serves public-sector leisure centre owners and operators, including local authorities and managers of sports facilities and swimming pools, with a focus on UK leisure sector organisations facing high…
Financial Health
StrongStrong
Location
Electrical Innovation (Wales) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including solar PV panel and battery installation, EV charging points, house rewiring, electrical fault diagnosis, smart thermostat fitting, and installation…
Serves homeowners and commercial property owners in South Wales and surrounding areas, including households seeking domestic energy upgrades and businesses commissioning electrical projects.
Financial Health
StrongStrong · Growing, Hiring · 2% CAGR over 4y
Location
K A Electrical Services Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides electrical installation services for residential and commercial projects, including new builds and renovations. Conducts electrical testing and maintenance such as EICR and PAT testing, and…
Serves homeowners, property renovators, new-build developers and commercial premises across Wales, including domestic and commercial customers seeking electrical, solar PV, EV charging and battery…
Financial Health
StrongStrong · Growing, Hiring · 39% CAGR over 3y
Location
Celsius Installations & Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including installation, maintenance and testing of electrical systems, rewiring and home automation. Also installs and services air conditioning, security…
Serves homeowners, landlords and businesses across South and West Wales, including offices, shops and contractors needing electrical, air conditioning, security and heating support.
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
Location
Rkes (Wales) Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides electrical contracting services for domestic and commercial properties, including house rewiring, electrical installations and repairs, fuse box upgrades, lighting and alarm systems,…
Serves domestic homeowners and commercial property customers needing electrical work across Carmarthen, Llanelli, Swansea and South Wales.
Financial Health
StableStable · -7% CAGR over 3y
Location
Solarcentric Renewables Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, supply and installation of solar photovoltaic systems for homes and businesses, including battery storage, EV charging points, and upgrades to existing solar PV installations, along…
Serves UK homeowners and businesses, including domestic property owners and commercial premises, seeking solar PV, battery storage and EV charging solutions.
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
Hassie Electrical Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs solar photovoltaic systems, battery storage and electric vehicle charging points for residential and commercial properties, providing site surveys, system design, installation…
Serves both B2B and B2C customers: businesses looking to reduce operational energy costs and improve ESG performance, and homeowners seeking lower household bills, energy independence, and backup…
Financial Health
WeakWeak · Hiring · 14% CAGR over 4y
Location
Biosol Renewables UK Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs biomass boiler systems and renewable heating equipment. Provides wood fuel and wood chipping, system design and planning, installation, and servicing and maintenance for biomass…
Serves businesses and community organisations with biomass or low-carbon heating projects, especially buyers seeking wood-fuel boiler installations, servicing and Renewable Heat Incentive support.
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 4y
Location
Electech Electrics Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides electrical installation services including solar photovoltaic panel systems, battery storage systems, and electric vehicle charging point installations for homes and businesses, along with…
Serves homeowners and businesses seeking solar PV, battery storage and EV charging, including domestic customers and commercial organisations needing certified electrical and renewable energy…
Financial Health
StrongStrong · Growing · 0% CAGR over 1y
Location
BURKE CONTRACTS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides civil engineering and plant hire services, including road drainage, earthworks, groundwork, and road construction. Supplies excavators, dumpers, rollers and other heavy equipment, and…
Serves construction contractors, infrastructure developers, wind farm developers and public sector project teams needing civil engineering, drainage, groundworks and plant hire support across the UK…
Financial Health
StableStable · -9% CAGR over 2y
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
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How Swansea Renewable Energy companies work and how to sell to them
What they do
Revenue usually comes from a mix of project fees, equipment margin, maintenance contracts and, for operators, generation-linked income. Swansea renewable-energy businesses may design and install onsite generation, manage connection work, maintain existing assets, advise on feasibility, or run small portfolios of low-carbon power assets. Pricing is typically fixed-price for scoped installation work, time-and-materials where site risk is uncertain, and retainer or service-level based for operations and maintenance. Larger asset or infrastructure engagements tend to involve milestone payments, warranty terms and subcontractor costs, while advisory work is usually a lower-value entry point before capital works begin.
Who they sell to
Customers are usually organisations with buildings, land, energy exposure or public procurement duties: commercial landlords, manufacturers, housing and public-sector estates, construction teams, developers and energy-service intermediaries. Decision-making often spans the facilities manager, estates lead, finance director, procurement team and external consultant, rather than sitting with one buyer. Smaller maintenance or feasibility scopes can close through direct relationships, while larger installations and operating contracts tend to move through tenders, framework agreements, consultant specifications or board-level capital approval. Sales cycles are therefore uneven: quick for remedial work, slower where grid connection, planning, finance and compliance need alignment.
What they buy
Most Swansea renewable-energy firms tend to spend on field-service management, project costing, job scheduling, asset monitoring, health and safety systems, CRM, accounting, document control and compliance administration. Operators and maintainers also need metering, reporting, remote diagnostics, insurance, fleet support, subcontractor vetting and technical recruitment. Installation-led firms are often buyers of design support, certification advice, specialist training, warehouse or yard capacity, and marketing that reaches estates and construction buyers. Where regulated activity is involved, audit trails and evidence management matter: tools that reduce manual certificate, generation, maintenance or licence-condition paperwork are usually easier to justify than general productivity claims.
Why and how to sell to them
Buying triggers tend to appear when a firm wins a new installation programme, takes on maintenance responsibility for more sites, hires a commercial or operations lead, prepares for an audit, or faces delays around connection, parts, labour or documentation. The useful outbound angle is usually operational risk rather than broad climate positioning. Renewable-energy buyers tend to respond to evidence that a supplier can cut site revisits, shorten quote-to-install cycles, improve handovers, keep project margins visible, or reduce compliance admin for Ofgem-facing activity. Credibility matters: sector-specific references, clear implementation effort and an understanding of subcontracted delivery usually carry more weight than generic sustainability messaging.
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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Frequently asked questions
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