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Renewable Energy Companies in Reading: 34 Active Firms (2026)
Renewable energy companies develop, generate and manage low-carbon power and related infrastructure across Reading’s metropolitan area.
Buying centres tend to sit with energy, estates, finance and operations teams rather than general IT buyers. Reading-area suppliers in this field usually sell into commercial asset owners, local infrastructure managers, project developers and mid-market businesses that need generation, grid connection, metering or asset-management support. Engagements are typically project-led, with advisory and engineering work giving way to recurring operating, maintenance or compliance tasks once assets are live. Revenue models therefore look closer to infrastructure services and power-market participation than conventional software subscriptions, even where monitoring systems and data workflows are part of the sale.
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Reading has 34 renewable energy companies actively trading, which makes the local list compact but commercially varied. The reported headcount across the cohort is 228, pointing to a base of small operating teams, asset managers and engineering-led services rather than a labour-intensive manufacturing cluster. Its Thames Valley setting matters because procurement is often tied to property portfolios, local infrastructure, grid-connection work and services for firms operating across Great Britain. The more useful split is not only generation technology, but whether a firm owns assets, develops projects for others, manages compliance or sells specialist services into the electricity market.
Ofgem’s licensing perimeter matters most where Reading-area businesses generate, move or supply energy in Great Britain. Licensed activities bring standard conditions, and sometimes special conditions, around market participation, metering, reporting and consumer-facing obligations where relevant. Legacy support schemes add another layer for accredited generating stations: the Renewables Obligation is closed to new generating capacity, but existing accredited stations still face audit checks and must submit generation information for Renewables Obligation Certificates. RenewableUK provides a sector voice for renewable electricity firms, so policy changes around deployment, grid access and exports tend to be filtered through both regulator guidance and trade-body commentary.
Reading’s cohort appears more mature than newly formed, with scale concentrated among commercially established operators and a longer tail of specialist service providers. Grid access, metering compliance and evidence requirements for accredited assets tend to favour firms that can manage paperwork as well as engineering delivery. That may deter casual entrants, while leaving room for asset-light developers, compliance specialists and maintenance providers to attach themselves to larger project owners. Consolidation looks plausible where smaller service firms depend on the same customer base, though the local market still appears fragmented rather than dominated by a common model.
34
Active firms
2026
5
Above £5M turnover
Reading cohort
1
New since 2022
Reading cohort
Key facts
About 14% of the trading cohort reports turnover above £5M (5 of 34 firms) — the rest sits below that revenue band.
2% of the cohort was incorporated since 2022 (1 firms), so a sizeable share is in its first few filing cycles.
Ofgem requires companies generating, moving or supplying energy in Great Britain to hold the relevant licence and comply 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 Renewables Obligation Certificates.
UK renewables generated 50.8% of UK electricity in 2024, up from 46.4% in 2023, with output reaching 144.7 TWh from 135.8 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 Reading renewable energy companies
Minety Battery Storage Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOwns and operates a 150MW grid‑scale battery energy storage project comprising three 50MW facilities. Stores electricity and supplies it to the grid to balance demand and support network stability…
Serves B2B developers and operators of battery storage, EV charging, data centre, industrial, commercial and port projects needing grid connections and private network support.
Financial Health
DistressedDistressed · 0% CAGR over 2y
Location
Lower Minety Energy Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops, invests in, and operates large-scale renewable energy projects, including solar, wind, waste-to-energy and battery storage installations, supplying low-carbon electricity to power grids,…
Serves institutional investors, project partners and energy market counterparties involved in large-scale renewable energy, with generated power delivered through electricity grids to homes and…
Financial Health
DistressedDistressed · -9% CAGR over 2y
Location
Doggerbank Offshore Wind Farm Project 1 Projco
Develops, finances and operates an offshore wind farm project within the Dogger Bank development, constructing and managing offshore turbines that generate renewable electricity for supply to the…
Location
Eastern Green Link 2
Develops and operates high‑voltage direct current electricity transmission infrastructure, including a subsea and underground cable project designed to transport renewable power between Scotland and…
Location
Develops and operates battery energy storage systems as part of an electricity infrastructure portfolio. Stores surplus power and supplies it to the grid to support renewable generation, manage…
Sells to wholesale electricity market participants, grid operators and energy suppliers needing flexible power and balancing services in the UK
Location
Spirit Solar Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and maintains renewable energy systems including solar photovoltaic panels, battery storage and electric vehicle charging equipment for residential and commercial properties. Also…
Serves homeowners, business owners and public-sector/community organisations in the South of England, including agriculture, care homes, corporates, councils, data centres, facilities management,…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 5y
Location
South Clyde Energy Centre
Develops and operates an energy‑from‑waste facility that processes non‑recyclable municipal, commercial, and industrial waste to generate electricity for the grid, with potential for heat supply to…
Serves local authorities, waste management operators and commercial or industrial waste producers, with electricity supplied to the grid and potential heat customers including local businesses or…
Location
Doggerbank Offshore Wind Farm Project 2 Projco
Develops, finances, and owns an offshore wind farm project, overseeing construction and operation of wind turbines and related electrical infrastructure to generate renewable electricity and supply…
Location
Tethys Energy Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs residential solar energy systems including photovoltaic panels, solar battery storage, Tesla Powerwall units, EV charging points and hot water storage, and provides maintenance,…
Serves homeowners in Reading and Berkshire, including households seeking residential solar energy systems, battery storage, EV charging and home energy upgrades.
Financial Health
StableStable · Hiring · 41% CAGR over 2y
Location
Develops and owns an offshore wind farm project as part of the Dogger Bank development, installing and operating large-scale offshore wind turbines and associated transmission infrastructure to…
Targets the UK electricity market and British households as end users, alongside energy-sector stakeholders including utilities, supply-chain partners, mariners, fisheries and local community…
Location
SSE Battery Monk Fryston
Trajectory
1y · 2022–NowDevelops and operates grid-scale battery energy storage assets as part of an electricity infrastructure group, supporting storage of renewable power and balancing of the electricity grid alongside…
Serves a mix of B2B, public sector and consumer markets across the UK and Ireland, including businesses buying energy solutions and market services, network users, electricity customers, investors,…
Financial Health
Insufficient historyInsufficient history
Location
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops and manages renewable energy projects, primarily solar power. Provides operations and maintenance and asset management services for energy assets, and develops new energy technologies and…
Serves renewable energy asset owners, infrastructure investors and power-sector clients, including solar, storage and new-energy project operators seeking O&M and asset management support.
Financial Health
StrongStrong · Hiring · 150% CAGR over 1y
Location
HARPER SOLAR LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInvests in and operates solar photovoltaic installations that convert sunlight into electricity. Generates renewable power from solar energy through utility-scale PV infrastructure and associated…
Financial Health
StrongStrong
Location
Doggerbank Offshore Wind Farm Project 4 Projco
Develops and owns an offshore wind farm project within the Dogger Bank development, generating electricity from offshore wind turbines and exporting renewable power to the electricity transmission…
Serves businesses, public sector bodies, energy market participants, investors and households through its electricity networks, energy solutions and supply businesses, with a strong focus on UK and…
Location
Develops and manages projects for the production of green hydrogen using renewable electricity, including planning, financing and development of hydrogen generation facilities and associated energy…
Location
Operates a multifuel energy‑from‑waste power plant that generates electricity by combusting refuse‑derived fuel and other non‑recyclable waste. Produces power for the grid while diverting waste from…
Serves businesses, public sector bodies, energy market participants and electricity users through generation, networks, energy supply and infrastructure, with a strong focus on the UK and Ireland…
Location
Develops and manages renewable energy generation projects, particularly offshore wind farms, as part of the SSE group, including project development, financing, construction oversight, and operation…
Serves UK and Ireland energy markets, including households and businesses, organisations needing energy solutions, electricity network users, and institutional or retail investors.
Location
Doggerbank Offshore Wind Farm Project 3 and 4 Leaseco
Provides leasing and financing structures for offshore wind farm assets, supporting the development, ownership and operation of large-scale renewable electricity generation projects within the Dogger…
Location
Develops and operates projects to produce low‑carbon hydrogen for industrial and energy applications, including facilities using electrolysis or gas reforming with carbon capture as part of energy…
Location
Develops, builds and operates utility‑scale solar power and battery energy storage projects. Provides project development, land acquisition and planning, construction, operations and maintenance,…
Serves B2B and energy-sector stakeholders across the UK and Europe, including landowners, communities, offtakers, and organisations procuring large-scale solar and battery storage projects, plus…
Location
Trajectory
1y · 2024–NowDevelops, builds and operates utility‑scale solar photovoltaic and battery energy storage projects. Provides renewable energy project development, construction, operations and maintenance, and asset…
Sells to businesses and landowners involved in utility-scale renewable energy, including electricity offtakers and asset owners needing development, construction, operations and asset management for…
Financial Health
Insufficient historyInsufficient history
Location
Trajectory
2y · 2020–NowFinancial sub-scores
Computed from 2 filingsDevelops, builds and operates utility-scale solar power and battery energy storage projects. Provides renewable energy project development, construction, operations and maintenance, asset management,…
Serves landowners, local communities, power offtakers, and renewable energy asset owners involved in large-scale solar and battery storage projects across the UK and Europe.
Financial Health
StableStable · 0% CAGR over 1y
Location
Develops, builds and operates utility-scale solar power and battery energy storage projects. Provides renewable energy project development, construction, operations and maintenance, asset management,…
Serves landowners, corporate and utility energy offtakers, investors and asset owners involved in large-scale solar and battery storage projects across the UK and Europe.
Location
Develops, builds and operates utility-scale solar power and battery energy storage projects. Provides renewable energy project development, construction, operations and maintenance, asset management,…
Serves landowners, local communities, energy offtakers and organisations seeking power purchase agreements, plus renewable asset owners needing operations, maintenance and asset management across the…
Location
Develops, builds and operates utility‑scale solar power and battery energy storage projects. Provides renewable energy project development, construction, operations and maintenance, asset management,…
Serves landowners, energy offtakers, renewable energy investors and asset owners across the UK and Europe, including organisations seeking power purchase agreements for large-scale solar and battery…
Location
Enviromena
Trajectory
2y · 2020–NowDevelops, builds and operates large-scale solar power and battery energy storage projects. Provides renewable energy project development, construction, operations and maintenance, asset management,…
Serves landowners, local communities and commercial or utility energy offtakers across the UK and Europe involved in large-scale renewable energy projects and power purchase agreements.
Financial Health
Insufficient historyInsufficient history
Location
Zero 6 Projects Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops, finances, engineers and operates decarbonisation and renewable energy projects, including wind, solar, carbon capture and green hydrogen facilities. Also provides electrical engineering and…
Targets B2B customers: renewable energy investors, utilities, large industrial corporates and nuclear power operators with capital-intensive decarbonization and clean energy infrastructure needs.
Financial Health
StrongStrong · Hiring · 39% CAGR over 4y
Location
Trajectory
3y · 2023–NowSupplies photovoltaic components including solar modules, inverters, mounting systems and balance‑of‑system equipment, and provides solar project development services such as feasibility studies,…
Serves B2B solar markets: professional installers, EPC contractors, project developers, and commercial or utility-scale PV project owners across global markets.
Financial Health
Insufficient historyInsufficient history
Location
Biowatt Site Services Limited
Trajectory
3y · 2023–NowProvides operation, asset management, development and funding services for anaerobic digestion and biogas facilities, including plant operations, performance management, project development, and…
Serves B2B customers that own, operate, develop or finance biogas and anaerobic digestion plants, including asset owners, project developers and plant operators needing operational, asset management…
Financial Health
Insufficient historyInsufficient history · 20% CAGR over 1y
Location
SRS WORKS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, develops and integrates renewable energy systems including solar PV, battery storage, EV charging and heat pumps. Provides EPC and project delivery services, energy efficiency upgrades, and…
Serves businesses and public-sector organisations across the UK, including airports, facilities management teams, offices, warehouses, schools and commercial property owners seeking renewable energy…
Financial Health
HealthyHealthy · -14% CAGR over 4y
Location
HIGHNETT LIMITED
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides electrical, instrumentation and control system engineering, including industrial maintenance, bespoke control panels, switchgear, distribution panels and changeover systems. Also supplies…
Serves B2B industrial operators and renewable energy businesses, including petrochemical plants, hazardous-area facilities, package equipment users, and solar, wind and CHP installation owners.
Financial Health
WeakWeak · -4% CAGR over 5y
Location
Fuel Cell Systems Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops and supplies hydrogen and fuel cell power systems for off‑grid and mobile applications. Provides fuel cell generators, hydrogen refuelling equipment, and on‑site hydrogen production systems,…
Serves businesses and public-sector infrastructure operators needing off-grid power or hydrogen refuelling, including rail, transport, CCTV/security, environmental monitoring, parking, marine,…
Financial Health
StrongStrong · Growing, Hiring · 37% CAGR over 4y
Location
EUROPEAN NETWORK SERVICES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides component-level repair and refurbishment of solar inverters and IT networking equipment. Offers maintenance contracts, on-site repair services, insurance damage assessments, spare parts…
Sells mainly to B2B customers across Europe, including solar inverter manufacturers, IT networking product manufacturers, installers and operators with damaged or unwanted electronic equipment.
Financial Health
StableStable · 0% CAGR over 2y
Location
Space Solar
Trajectory
3y · 2022–NowDevelops space‑based solar power technology, designing orbital systems that collect solar energy in space and transmit it wirelessly to Earth to provide continuous renewable electricity and grid…
Targets governments, utilities, grid operators and energy-sector investors seeking large-scale renewable baseload power, grid balancing and energy security for net zero electricity systems.
Financial Health
Insufficient historyInsufficient history
Location
PWE Holdings Plc
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsOwns and operates distributed energy generation systems using micro gas turbine combined heat and power (CHP) units. Supplies on-site electricity and heat to commercial and industrial facilities and…
Serves UK commercial and industrial organisations with significant energy needs, including food and beverage, pharmaceutical, data centre/telecoms, leisure/hospitality, healthcare and education…
Financial Health
DistressedDistressed · -11% CAGR over 4y
Location
Heron Mechanical Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, supply, installation, testing and commissioning of mechanical and electrical building services for commercial and industrial properties, including air conditioning, heating,…
Serves B2B customers managing commercial and industrial properties, including facilities managers, developers, contractors and site operators needing building services support.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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How Reading renewable energy companies work and how to sell to them
What they do
Reading-area renewable energy firms usually earn through a mix of project fees, power-market income and post-commissioning service revenue. Development-led businesses charge for feasibility, planning, grid-connection support and project management, often against milestone payments. Operators and asset managers depend more on generation revenue, availability-based fees, metering work, maintenance contracts and compliance retainers. Software-like elements are common, especially monitoring, reporting and asset-control workflows, but the commercial unit is usually a site, connection, meter, portfolio or generation asset rather than a seat licence. Pricing therefore tends to follow capital-project budgets first, then ongoing per-asset or retainer models once a scheme is operating.
Who they sell to
Most sell to organisations with physical assets, energy exposure or infrastructure obligations: commercial landlords, industrial operators, project developers, utilities-adjacent service firms and larger local businesses with estates to decarbonise. Buyers are usually finance directors, energy managers, estates directors, operations leads, procurement teams and, where electricity-market activity is involved, compliance or asset-management heads. Smaller advisory jobs may be won through direct relationships and technical referrals. Larger build, connection or operating contracts tend to involve formal procurement, board-level capex approval and legal review, especially where performance, land rights, metering accuracy or Ofgem-facing obligations affect the contract.
What they buy
Renewable energy firms tend to spend on tools and services that reduce friction between engineering delivery, asset operation and regulated reporting. Common software categories include asset management, field-service scheduling, document control, metering-data handling, forecasting, finance systems, CRM, contract management, cyber security and analytics for generation or availability. They also buy specialist legal support for land, grid and power contracts; accounting advice for project vehicles and revenue recognition; recruitment for electrical, commercial and compliance roles; and insurance, health-and-safety training, testing equipment, telemetry, cloud hosting and data integration. For smaller operators, the practical test is often whether a supplier can fit into project margins without adding procurement burden.
Why and how to sell to them
Renewable energy buyers tend to review suppliers when a project moves from feasibility into delivery, an asset portfolio changes hands, a grid-connection offer lands, an audit or compliance deadline approaches, or operating teams start to outgrow spreadsheets and email-based evidence trails. Pain points are usually concrete: delayed connections, poor visibility of asset performance, fragmented meter readings, manual certificate evidence, uncertain maintenance costs and cash tied up between project milestones. Outbound that works in this market is typically specific to the operating model: lower downtime for asset owners, cleaner audit trails for compliance teams, faster handover from construction to operations, or clearer margin control for service-led businesses.
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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