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Renewable Energy Companies in Portsmouth: 29 Active Firms (2026)
Renewable energy companies generate, store, move or supply low-carbon power, with this Portsmouth cohort serving the city and wider coastal economy.
Buying activity tends to sit with estates, facilities, energy, finance and infrastructure teams rather than a single software-style budget holder. Portsmouth suppliers in this field are likely to sell to commercial landlords, public-sector estates, industrial sites, port-adjacent operators and project developers, with procurement shaped by site access, connection constraints, maintenance obligations and payback scrutiny. Engagements are usually project-led or service-led: feasibility work, installation, specialist engineering, operations support and compliance tasks can precede longer asset-management or maintenance relationships. The buyer profile points towards mid-market operators and lean asset owners, so sales cycles tend to involve technical due diligence and procurement checks rather than purely transactional buying.
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Portsmouth has 29 active renewable-energy companies in this list, making it a compact local cohort rather than a broad regional cluster. Reported employment totals 247 people, which fits the pattern of lean engineering, installation, project-development and asset-operation teams serving commercial and public-sector demand around the city. The presence of a small group of higher-turnover operators suggests that much of the market remains services-led or project-led, with revenue tied to contracts, maintenance work and asset participation rather than large corporate platforms. That leaves the page focused on a narrow, operationally grounded local market.
Ofgem licensing is the main boundary for renewable-energy businesses that generate, move or supply energy in Great Britain. Once licensed, operators must comply with standard conditions and any special conditions attached to their activity, so legal and operational readiness matters before commercial launch. The Renewables Obligation is now a legacy support scheme rather than a route for new generating capacity, but accredited stations remain subject to audit and must submit generation information for Renewables Obligation Certificates. RenewableUK gives the sector a trade-body voice across deployment and export activity, which matters for smaller coastal suppliers navigating grid, planning and procurement constraints.
Commercial development appears more likely to come through project depth than a broad wave of new entrants. Portsmouth firms tend to sit close to installation, engineering, operations and local asset support, which can produce durable customer relationships but also exposes suppliers to planning friction, grid-connection queues and public-sector procurement cycles. Scale-up scarcity may persist where asset ownership requires balance-sheet capacity, while service-led firms may look for partnerships with developers, landlords and infrastructure customers. Consolidation looks plausible in specialist maintenance and project delivery, especially where buyers prefer a single accountable contractor across energy performance, compliance and uptime.
29
Active firms
2026
3
Above £5M
turnover
4
Since 2022
incorporations
Key facts
About 10% of the trading cohort reports turnover above £5M (3 of 29 firms) — the rest sits below that revenue band.
13% of the cohort was incorporated since 2022 (4 firms), so a sizeable share is in its first few filing cycles.
Companies generating, moving or supplying 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, but accredited stations still face Ofgem audit and compliance checks and must submit generation data for Renewables Obligation Certificates.
UK renewables generated 50.8% of electricity in 2024, up from 46.4% in 2023.
Renewable output reached 144.7 TWh in 2024, up from 135.8 TWh, with wind supplying 29.5% of UK electricity.
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 Portsmouth Renewable Energy companies
CABLE CONNECTIONS LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides commercial and industrial electrical contracting, including power network connections as a NERS‑accredited independent connections provider. Delivers cable laying, civil and groundworks, EV…
Serves B2B and public-sector customers including commercial and industrial organisations, developers, councils and local authorities across England and Wales, with some domestic EV customers and…
Financial Health
StrongStrong · Growing, Hiring · 24% CAGR over 4y
Location
RED PENGUIN ASSOCIATES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides marine consultancy and subsea cable engineering services for offshore infrastructure projects. Advises on project strategy, planning, construction and asset management for submarine cable…
Serves B2B owners and developers of complex subsea cable systems, particularly in power transmission, telecoms, renewables, oil and gas, and wider marine infrastructure markets.
Financial Health
StableStable · -65% CAGR over 4y
Location
CityEV Ltd.
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures AC electric vehicle charge points and related infrastructure systems for residential, commercial and public on‑street installations. Supplies chargers, protection units and…
Serves UK households, businesses, local authorities, charge point operators, power companies, OEMs, and electrical contractors/installers needing EV charging infrastructure for domestic, commercial…
Financial Health
StrongStrong · Growing, Hiring · 63% CAGR over 4y
Location
We Are Primus Ltd
Trajectory
1y · 2025–NowProvides construction and engineering services including electrical and mechanical installations, renewable energy systems, civil works, building fit‑outs and fabric repairs. Also offers project…
Serves business and institutional buyers needing construction and engineering work, including project managers and energy or sustainability teams commissioning electrical, mechanical, renewables,…
Financial Health
Insufficient historyInsufficient history
Location
Utilidex Ltd.
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops cloud-based software platforms for energy suppliers, consultants, and businesses to manage energy procurement, billing, and consumption data. Provides tools for time‑of‑use tariff billing,…
Serves B2B energy suppliers, energy consultants and corporate energy teams managing procurement, billing, consumption, costs, carbon and sustainability, including organisations preparing for flexible…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 2y
Location
Southern Counties Heating & Plumbing Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides design and installation of plumbing, heating, gas and air source heat pump systems for new-build and renovation projects. Also installs air conditioning and ventilation and manages projects…
Sells mainly to property developers, building contractors and commercial clients needing plumbing, heating and gas installations for new-build and renovation projects. Also serves homeowners and…
Financial Health
DistressedDistressed · 0% CAGR over 5y
Location
Infinity Energy Services Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs renewable energy and energy efficiency systems, including solar PV panels, battery storage, air source heat pumps, air conditioning, EV charging points and LED lighting, for…
Serves homeowners, businesses, farms and public sector organisations looking to reduce energy costs and adopt renewable energy, with specific pages for residential, commercial and public sector…
Financial Health
StrongStrong · Growing, Hiring · 71% CAGR over 4y
Location
Dynamic Energy Solutions Holdings Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides renewable energy and electrical contracting services for commercial and industrial clients, including solar farm development and asset management, EV charger installation, high‑voltage…
Serves B2B customers, including commercial and industrial property operators, solar farm owners, facilities managers and companies needing renewable energy, EV charging, high-voltage or electrical…
Financial Health
StrongStrong · Growing, Hiring · 35% CAGR over 5y
Location
Solstice Energy Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and commissions solar photovoltaic and solar thermal energy systems for domestic, community and commercial buildings, including roof‑mounted PV arrays, grid‑connected systems and…
Serves homeowners, community organisations and commercial building owners or occupiers seeking solar PV and thermal systems for domestic, community and commercial properties.
Financial Health
StrongStrong · Growing, Hiring · 32% CAGR over 4y
Location
TVR ELECTRICAL SERVICES LIMITED
Trajectory
4y · 2020–NowFinancial sub-scores
Computed from 4 filingsProvides electrical contracting services including installation and maintenance of solar PV systems, battery storage and electric vehicle charging points. Serves residential, commercial and…
Serves homeowners and commercial or industrial businesses in Hampshire and West Sussex needing electrical contractors, domestic electricians, solar PV, battery storage or EV charging support.
Financial Health
StableStable · Hiring · 17% CAGR over 5y
Location
Boskalis Offshore
Provides offshore and marine contracting services including dredging, seabed intervention, marine survey, heavy marine transport and lifting, installation of subsea cables, towage and salvage, and…
Serves B2B and public-sector clients in ports, offshore wind, oil and gas, and maritime infrastructure, including port authorities, energy developers, infrastructure owners, and governments in…
Location
Boskalis
Provides offshore subsea and marine services for energy and maritime infrastructure projects, including marine survey, seabed intervention, subsea cable installation, heavy marine transport, offshore…
Serves B2B and public-sector clients in ports, offshore wind, oil and gas, and maritime infrastructure, including port authorities, energy developers, infrastructure owners and coastal-region…
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops and supplies electric storage boiler systems that convert renewable electricity into industrial steam and hot water. Systems integrate thermal energy storage and controls to support…
Serves industrial manufacturers with steam or hot-water demand, especially food, beverage and pharmaceutical producers, plus solar developers pairing renewable generation with industrial heat users.
Financial Health
StrongStrong · Hiring · 35% CAGR over 2y
Location
EE RENEWABLES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls renewable energy systems for homes and businesses, including solar photovoltaic panels, battery storage, air source heat pumps and electric vehicle charging points. Provides system design,…
Serves homeowners looking to reduce energy bills and commercial customers investing in renewable energy, including buyers of solar, battery storage, heat pump and EV charging solutions.
Financial Health
HealthyHealthy · -38% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides operations and maintenance services for small and medium-scale wind turbines. Offers turbine repowering, condition monitoring, performance upgrades and repairs, installation of new turbines,…
Serves UK wind turbine owners, especially farmers, agricultural businesses and organisations with single turbines or larger portfolios, plus businesses with high energy requirements seeking on-site…
Financial Health
StableStable
Location
Aqua Superpower Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and operates fast‑charging infrastructure for electric boats, installing DC marine chargers at marinas and waterside locations. Provides a connected charging network and mobile app for…
Serves marinas and waterside destinations, electric boat owners, and marine industry partners such as boat makers and powertrain manufacturers across the global electric boating market.
Financial Health
WeakWeak
Location
ASSET PLUS ENERGY PERFORMANCE LIMITED
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides consulting, development, financing and implementation of energy infrastructure upgrades, including energy efficiency and zero‑carbon generation projects. Delivers projects for public and…
Serves public and private sector organisations across the UK and Ireland, including councils, colleges and accommodation providers seeking to reduce energy use and progress toward net zero carbon…
Financial Health
StrongStrong · Hiring · 46% CAGR over 5y
Location
INTERNAL FACILITIES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and maintains building energy systems including HVAC, air conditioning, ventilation and electrical installations. Provides facilities management and installs solar PV and electric…
Serves B2B and B2C customers across commercial, hospitality, industrial and residential property sectors, including building owners, facilities teams, businesses and homeowners.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
EGS (INTERNATIONAL) LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides marine hydrographic and geophysical surveying services, including seabed mapping, geotechnical investigations, metocean data collection, positioning and construction support, and UXO surveys…
Serves B2B clients in telecommunications, renewable energy, oil and gas, charting, ports and marine infrastructure, including energy and telecoms companies with global marine project needs.
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 2y
Location
NIGEL GREEN WEALTH MANAGEMENT LIMITED
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsProvides instrumentation, electrical and commissioning engineers, technicians and managers to support EPC contractors on power and energy projects. Offers commissioning support, plant optimisation…
Serves EPC contractors and power-sector operators, including energy-from-waste, biomass, CCPP and water treatment projects.
Financial Health
StableStable · 0% CAGR over 3y
Location
Westminster Gravels
Provides dredging and marine contracting services, including port construction and maintenance, land reclamation, coastal defence, seabed intervention, heavy marine transport, offshore installation,…
Serves port authorities, offshore wind and oil and gas operators, government infrastructure bodies, and civil engineering clients in maritime, coastal, delta and inland waterway markets.
Location
AB SOLAR LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsInstalls solar photovoltaic systems for small-scale projects, providing system design, supply and installation of solar panels, inverters, mounting systems and related components for residential or…
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 2y
Location
THE HEATING STORE LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides plumbing and heating services including boiler installation, servicing and repairs, central and underfloor heating systems, power flushing, and drainage work. Also installs air source heat…
Serves domestic households and commercial property owners across Hampshire, particularly those arranging maintenance, repairs or installations for building services.
Financial Health
WeakWeak · 0% CAGR over 1y
Location
Salvis Group Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides energy management and building services engineering consultancy for new builds and refurbishments. Services include mechanical and electrical design, building energy audits, BMS audits,…
Serves public sector bodies, healthcare trusts, local authorities and organisations that own or operate buildings, especially those planning new construction, refurbishment, energy compliance or…
Financial Health
StableStable · Hiring · 32% CAGR over 4y
Location
Develops and supplies technologies and lifecycle services for the marine and energy sectors, including ship power and propulsion systems, engine-based power plants, energy storage systems, and…
Serves global B2B customers in the marine and energy sectors, including shipowners and operators of large vessels, ferry companies, utilities, independent power producers and energy storage…
Location
EXCELSIOR HEATING SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls, services and repairs domestic and commercial heating and plumbing systems, including air and ground source heat pumps, gas, LPG and oil boilers, MVHR ventilation, underfloor heating and…
Serves homeowners, landlords and businesses with domestic and commercial properties, including flats, detached homes, new builds, listed farmhouses, leisure facilities and commercial premises across…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
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How Portsmouth Renewable Energy companies work and how to sell to them
What they do
Revenue usually comes from a blend of project fees, installation margin, engineering consultancy, operations support and, for asset owners, income linked to generated or supplied electricity. Portsmouth renewable-energy companies are more likely to sell an engineered outcome than a repeatable software licence: surveys, connection work, storage integration, monitoring, maintenance, metering and compliance support. Pricing therefore tends to follow fixed scopes, milestones, day rates or retainer-style service agreements, with longer relationships built around uptime, planned maintenance and reporting obligations. Where a firm owns or part-owns assets, cash flow depends more on power-sale arrangements, subsidy legacy compliance and asset performance.
Who they sell to
Buyers are typically estates directors, facilities managers, energy managers, CFOs, infrastructure leads and procurement teams, often with external advisers involved before commitment. Commercial landlords, public-sector estates, industrial premises and port-adjacent operators tend to ask for payback evidence, site-risk assessment and maintenance cover before moving from feasibility to delivery. Small works can be bought directly, but larger installations or asset-operation contracts usually pass through staged approvals, board-level finance scrutiny and sometimes formal tendering. Sales cycles vary with grid, planning and access constraints, so proposals need to help a technical sponsor persuade finance and procurement as much as they address the engineer.
What they buy
Most Portsmouth renewable-energy firms tend to spend on field-service management, project costing, asset monitoring, metering workflow, billing support, document control and reporting tools. Safety, insurance, planning, environmental advice, grid-connection support and contract law also sit close to the operating model, because delivery risk often sits on the supplier long after installation. Lean teams may outsource finance, payroll, recruitment, bid writing, technical content and lead generation rather than build internal functions. Infrastructure needs are usually practical: cloud systems for drawings and logs, cyber security for operational systems, mobile workforce tools, vehicles, test equipment, spares management and training for site-based staff.
Why and how to sell to them
Commercial intent often appears when a renewable-energy firm wins a public-sector framework place, takes on a larger installation pipeline, adds maintenance contracts, applies for an Ofgem licence, faces a compliance audit or hires into finance, operations or delivery management. Outbound tends to work better when it starts with margin leakage, site downtime, reporting burden, cash collection or bid conversion rather than generic decarbonisation language. These buyers tend to value evidence that a supplier can shorten admin cycles, reduce project slippage, improve audit readiness or make field teams easier to schedule. Local references by asset type are usually more useful than broad energy-sector claims.
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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