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Utilities Companies in Portsmouth: 35 Active Firms (2026)
Utilities companies in Portsmouth provide energy, water, waste and infrastructure services for local households, businesses and public-sector sites.
Buying tends to sit with estates, procurement, facilities, operations and infrastructure teams rather than a single digital budget holder. The common purchasing cases are practical: keeping sites supplied, metered, maintained, compliant and cleared, with service continuity usually valued above novelty. Portsmouth operators in this slice look closer to local utility-service providers than national network owners, often taking repeat work from commercial premises, public-sector estates, landlords, contractors and infrastructure customers. Typical engagements appear to be service agreements, maintenance lots, waste or water-adjacent contracts, and metering or site-support work, with lean delivery teams expected to cover a defined local operating patch.
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Portsmouth has 35 actively trading utilities companies in this list, making it a compact local cohort rather than a broad regional market. Reported employment totals 126 people, which points to a sector made up mostly of small operating teams rather than large asset-owning utilities. Only one firm sits above £5M in turnover, so the revenue profile is concentrated below the larger local-provider threshold. Nine firms were incorporated since 2022, suggesting some recent formation around utility-adjacent services, though the overall market still appears constrained by local contracts, asset access and compliance requirements.
Utility work usually carries more operational oversight than many local service sectors. Energy-facing activity is shaped by connection processes, metering obligations and customer-service rules, while water, waste and site-services work tends to involve environmental permits, safety processes and audit trails. Public-sector and infrastructure customers add procurement checks, service-level monitoring and documentation requirements. For small Portsmouth operators, that can make sales cycles slower and administrative work heavier, but it also favours suppliers that can evidence continuity, response times and compliance rather than relying only on price.
The cohort appears weighted towards lean local operators and utility-adjacent service providers, so change is likely to come through contract bundling, compliance overhead and customer pressure for cleaner operations rather than standalone technology bets. Scale-up scarcity may keep acquisition activity selective, with larger buyers more interested in repeatable local contracts, specialist permits or access to customer sites than in brand reach. Public-sector procurement discipline tends to reward reliability and documentation, while private customers remain cost-sensitive. Newer entrants may find space around metering, maintenance, waste reduction and estate-support services, but margins are likely to stay exposed to labour, vehicles and insurance costs.
35
Active firms
2026
1
Above £5M
reported revenue
9
Since 2022
new incorporations
Key facts
About 2% of the trading cohort reports turnover above £5M (1 of 35 firms) — the rest sits below that revenue band.
25% of the cohort was incorporated since 2022 (9 firms), so a sizeable share is in its first few filing cycles.
Portsmouth utilities providers cover energy, water, waste and infrastructure support for households, businesses and public-sector sites.
These services sit close to day-to-day building use and site continuity, rather than discretionary business spending.
Local market mapping is likely to hinge on operating model and contract type, not just company size.
Top Portsmouth Utilities companies
IMPREG (UK) Limited
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsDevelops and manufactures glass‑fibre reinforced CIPP (cured‑in‑place pipe) liner systems used in trenchless rehabilitation of sewer and pipeline infrastructure, supplying UV‑curable liners and…
Sells to B2B customers and partners in the global infrastructure rehabilitation industry, especially organisations involved in trenchless pipe and sewer rehabilitation.
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
JN UTILITY SERVICES LTD
Trajectory
1y · 2024–NowFinancial Health
Insufficient historyInsufficient history
Location
OPTIMUM DRAIN LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed
Location
Cobra Energy Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 41% CAGR over 4y
Location
Jidlassconcept Limited
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed
Location
Gattica Associates Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides utility infrastructure consultancy, offering design and management services for projects involving utilities. Supports regeneration, land development, highways, rail and civil engineering…
Serves UK clients, consultants and contractors involved in regeneration, land development, highways, rail and civil engineering projects, including major infrastructure and public-sector schemes.
Financial Health
DistressedDistressed · 0% CAGR over 2y
Location
Electrical & Pump Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, builds and maintains water and wastewater pumping and treatment systems. Provides engineering, construction, asset management and repair services, and supplies equipment including pump…
Serves B2B and B2C water-sector customers, including utilities, commercial and industrial sites, data centres, and domestic users seeking water treatment, pumping, wastewater, water boosting and…
Financial Health
StrongStrong
Location
Watersync Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides engineering consultancy services for the water industry, specialising in hydraulic modelling of clean water distribution networks. Services include network modelling, asset management…
Serves water supply companies and other water industry organisations in the UK and beyond, including asset management, operations and engineering teams responsible for clean water networks.
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
ATLAS STEEL LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed · -78% CAGR over 3y
Location
L G WOOD LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides wastewater and sewerage infrastructure services for utility networks, including flood mitigation, sewer repair and rehabilitation, no‑dig pipe lining, drainage maintenance, CCTV surveys,…
Serves utility providers and framework contractors responsible for water, wastewater and sewerage networks, including infrastructure asset owners and contractors operating across utility networks.
Financial Health
WeakWeak · Hiring · 32% CAGR over 2y
Location
MATRIX PROPERTY FUND MANAGEMENT LLP
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and manages multi‑utility infrastructure and network adoption services for property developments, including electricity distribution and water networks. Supports the design, installation and…
Serves B2B clients with multi-utility infrastructure and network adoption requirements, including organisations involved in power distribution, water and related development projects.
Financial Health
StrongStrong
Location
SOUTHERN UTILITIES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides utility infrastructure construction services for gas networks, including gas mains replacement, installation of new gas pipelines, cathodic protection systems, deep excavations and no‑dig…
Targets B2B customers: large and medium-sized utility infrastructure owners, particularly gas network operators and asset owners requiring accredited contractors for infrastructure projects and…
Financial Health
StrongStrong · Hiring · 18% CAGR over 2y
Location
UDlive Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops and supplies IoT-based environmental monitoring devices and software for infrastructure networks. Products include battery-powered water level sensors, RTUs, road temperature and bin…
Sells to water utilities, local authorities, highways agencies, civil engineering contractors and infrastructure operators responsible for wastewater networks, flood-prone drainage assets, roads and…
Financial Health
StrongStrong · Hiring · 41% CAGR over 2y
Location
Plantwork Systems Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops and supplies wastewater treatment systems and equipment for municipal, commercial and industrial applications, including biological nutrient removal units, sludge thickening devices,…
Serves wastewater utilities, municipal operators, and commercial or industrial sites with wastewater treatment needs, including organisations managing sludge, nutrient removal, and effluent…
Financial Health
WeakWeak · -6% CAGR over 5y
Location
Offgrid Pro Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops, supplies and installs microgrid energy systems using high‑capacity battery storage and intelligent control software to manage electricity purchasing and usage. Systems store grid or…
Serves high-energy residential consumers, particularly owners of high-end homes, estates and properties with pools, spas, outbuildings or existing solar PV, and works with their architects and M&E…
Financial Health
HealthyHealthy · Hiring · 41% CAGR over 2y
Location
R & R Utilities Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides gas utility infrastructure services, including installation of gas connections and related engineering works. Operates as an approved contractor for major gas network companies and supports…
Serves large UK gas utility companies and utilities-sector clients, particularly organisations awarding major contracts to approved contractors for gas network and connection programmes.
Financial Health
StrongStrong
Location
HYDEN WOOD MANAGEMENT COMPANY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
SF Facilities Management Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
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
Solved M & E Limited
Trajectory
5y · 2020–NowFinancial Health
Insufficient historyInsufficient history
Location
BRADY & RENAUD LIMITED
Trajectory
5y · 2021–NowFinancial Health
Insufficient historyInsufficient history
Location
HANEVO LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and delivers infrastructure projects for sectors including healthcare, education, food processing and pharmaceuticals. Provides design, construction, installation, and maintenance of water…
Serves B2B and public-sector clients in critical infrastructure sectors, including hospitals and healthcare estates, education providers, water utilities, municipal wastewater operators, and…
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 2y
Location
DLEC RENEWABLES LTD
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Hartville Gas Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong
Location
SOLENT POWER LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs diesel generators and uninterruptible power supply (UPS) systems. Provides generator servicing, maintenance, repairs, inspection and testing, load bank testing, fuel management,…
Serves UK businesses across varied industries needing emergency power support, alongside homeowners seeking residential generator solutions.
Financial Health
StrongStrong · Hiring · 46% CAGR over 4y
Location
N.DAY HEATING & PLUMBING LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 5y
Location
Elite Temperature Control Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong · Growing, Hiring · 22% CAGR over 2y
Location
4G WATER LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides water treatment and water hygiene services, including Legionella risk management, system monitoring, remedial works, and compliance support. Also offers training and membership services…
Serves businesses and organisations responsible for water treatment, hygiene and HSE compliance, including large multi-site operators and clients needing remedial works.
Financial Health
DistressedDistressed · -13% CAGR over 3y
Location
Legacy Air Conditioning Services Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StrongStrong · Growing · 0% CAGR over 1y
Location
GROOVE ASSOCIATES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsSupplies medium- and high-voltage cable accessories, including transition joints, tee-off joints and mechanical shrinkage joints for utility and railway power networks. Also distributes underwater…
Serves B2B customers in utilities, rail and subsea markets, including UK and European utility operators and organisations running underwater or marine electrical equipment such as navigation buoy…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
Arbuthnott Turbines Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
Firs Farm Turbine Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
Airsource Climate Ltd
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
HealthyHealthy · Hiring · 14% CAGR over 3y
Location
APPLIED POWER SERVICES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical engineering services for commercial and industrial power systems, including power system design, high‑ and low‑voltage switchgear and transformer installation, cable installation…
Serves UK commercial and industrial organisations with high- and low-voltage power infrastructure needs, including large industrial operators, manufacturing sites, utilities-style facilities and…
Financial Health
StrongStrong · Hiring · 10% CAGR over 2y
Location
H&T Plumbing & Heating Limited
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
HealthyHealthy · 0% CAGR over 3y
Location
Celsius Comfort & Control Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · Hiring · 73% CAGR over 2y
Location
Volt Energy Southern Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong
Location
SOUTH COAST RENEWABLE ENERGY LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
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How Portsmouth Utilities companies work and how to sell to them
What they do
Revenue usually comes from repeat service contracts, planned maintenance, call-outs, project work and usage-linked charges where metering, waste handling or site support is involved. Portsmouth utility firms in this slice are more likely to sell an operational service than a pure commodity: keeping premises connected, inspected, cleared, monitored or compliant. Pricing typically mixes fixed monthly retainers, per-site fees, per-visit rates, quoted works and pass-through costs for materials, disposal or subcontracted activity. Gross margins can be tight where vans, labour, insurance and disposal costs sit close to revenue, so suppliers that help protect utilisation or reduce rework may have a clearer case.
Who they sell to
Customers are usually commercial landlords, facilities managers, housing providers, contractors, public-sector estates teams and infrastructure customers with local assets to run. The buyer is often an Estates Manager, Facilities Manager, Operations Director, Procurement Lead or Finance Director, with compliance staff involved when permits, safety evidence or environmental paperwork matter. Smaller jobs may be bought by phone, referral or direct quotation, while larger premises and public-sector work tend to move through approved supplier lists, frameworks, tender portals or repeated RFQs. Sales cycles are typically short for reactive work, but slower where site access, insurance checks and service-level terms need approval.
What they buy
Most Portsmouth utility firms tend to spend on tools that help small field teams plan work, evidence completion and invoice without losing margin. Relevant categories include field-service scheduling, job management, mobile forms, asset registers, CRM, quote-to-cash, billing, payments, accounting, document storage and customer-service tracking. Operational spend also runs through fleet support, fuel management, vehicle maintenance, insurance, PPE, training, recruitment, subcontractor management and waste or materials handling. Where contracts require audit trails, they may also buy health and safety systems, environmental reporting, risk-assessment support, cyber security, payroll, HR administration and legal advice for tender terms or service disputes.
Why and how to sell to them
Utility buyers tend to evaluate vendors when a new contract stretches scheduling, a public-sector tender adds reporting duties, an insurer asks for better evidence, or labour and vehicle costs begin to expose weak processes. Leadership changes, a move into another service line, depot expansion, framework admission or a run of missed visits can also create intent. Outbound works better when it starts with practical operating pressure: fewer failed call-outs, faster proof of work, cleaner invoicing, easier audit packs or tighter control of subcontractors. Claims should be specific to local service delivery rather than framed as abstract digital change.
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.
Also in Portsmouth
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Frequently asked questions
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