Utilities Companies in Swansea: 29 Active Firms (2026)
Utilities companies in Swansea supply essential energy, water, waste and infrastructure services across the surrounding metropolitan area.
Buying centres tend to sit with estates, operations, finance and procurement teams rather than a single technology sponsor. The relevant suppliers usually sell practical service capacity: energy supply support, water and waste handling, metering, network maintenance, facilities infrastructure or environmental services. Engagements are often contract-led, with buyer due diligence shaped by continuity of service, site access, insurance, safety processes and the ability to work across commercial, public-sector, industrial and residential settings. The cohort therefore looks closer to local infrastructure operations than to discretionary business services, with measurable revenue more useful than funding history as a scale marker.
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Swansea has 29 actively trading utilities companies in this cohort. That is a small local market, so individual contract wins, framework positions and public-sector renewals can change the visible shape of the list more than they would in a larger regional cluster. The employment footprint is modest: these firms report 63 staff between them, consistent with owner-managed operators, site-service specialists and small teams delivering recurring work across energy, water, waste and infrastructure-adjacent activities. The result is a market where operating permissions, service reliability and customer retention matter more than headcount scale.
Regulated and infrastructure-adjacent services carry a different risk profile from ordinary local contracting. Energy supply, water services, waste management, metering and network maintenance tend to involve service continuity, safety documentation, environmental controls and, for some activities, permissions linked to the assets or materials being handled. Public-sector and industrial customers also tend to buy through procurement processes that favour evidence of insurance cover, response procedures and prior operational delivery. For Swansea suppliers, market structure is therefore shaped by compliance capacity as much as by sales reach, particularly where work touches occupied sites, essential services or environmental obligations.
Demand appears likely to remain operationally led, with buyers prioritising reliability, response times and evidence of safe delivery over broader positioning. Smaller operators may continue to find room in site-specific work, local maintenance and environmental services, while more complex regulated activity tends to favour firms with established procedures and recurring contracts. Consolidation is plausible where back-office compliance, insurance costs and tender requirements become burdensome for owner-managed teams. The cohort also looks exposed to public procurement cycles and industrial spending patterns around Swansea, so progress may be uneven rather than a simple expansion story.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
29
Active firms
2026
1
Above £5M
annual turnover
5
Newer firms
incorporated since 2022
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Key facts
About 3% of the trading cohort reports turnover above £5M (1 of 29 firms) — the rest sits below that revenue band.
17% of the cohort was incorporated since 2022 (5 firms), so a sizeable share is in its first few filing cycles.
Swansea utilities suppliers serve essential energy, water, waste and infrastructure demand across the surrounding metropolitan area.
Buyers in this market tend to prioritise continuity, compliance and maintenance rather than discretionary project spend.
The local supplier base appears to include infrastructure, waste, water and energy-adjacent operators rather than a single narrow sub-sector.
Top Swansea Utilities companies
Financial Health
N/AN/A
Location
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Financial sub-scores
Computed from 5 filingsProvides underwater and remote inspection services for the water industry, including ROV pipeline and tunnel surveys, commercial diving, confined space inspections, maintenance, cutting, welding,…
Serves UK water companies, utility operators and infrastructure teams responsible for assets such as sewage treatment works, service reservoirs, pipelines, tunnels and subterranean chambers.
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
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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
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Financial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
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Financial Health
N/AN/A
Location
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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
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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
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Computed from 2 filingsFinancial Health
HealthyHealthy · 0% CAGR over 1y
Location
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Financial Health
N/AN/A
Location
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Financial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
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Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides water and sewage system services including borehole drilling, water treatment for iron, manganese and pH control, installation and maintenance of sewage treatment plants, pumps and water…
Serves homeowners, farmers and business owners with domestic, agricultural, commercial and industrial water or sewage needs across Carmarthenshire, Pembrokeshire, Ceredigion, Swansea, Glamorgan and…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
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Computed from 3 filingsSupplies liquefied petroleum gas (LPG) to domestic and commercial customers, offering bulk LPG deliveries and sales of gas cylinders with refill services. Provides gas supply accounts and ordering…
Serves domestic and business LPG customers in Wales, including existing LPG users looking to switch supplier and buyers needing bulk deliveries or cylinder refills.
Financial Health
StableStable · -9% CAGR over 2y
Location
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Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides water and wastewater treatment services, including industrial wastewater processing, biosolids management, and drinking water purification. Recovers materials from domestic waste streams for…
Serves businesses, utilities and public-sector or development organisations needing water and waste treatment, including industrial companies, domestic waste operators and communities requiring safe…
Financial Health
StableStable
Location
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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
N/AN/A
Location
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Financial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
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Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
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Computed from 2 filingsFinancial Health
StrongStrong
Location
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Computed from 5 filingsFinancial Health
StableStable · Hiring · 14% CAGR over 4y
Location
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Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
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Computed from 5 filingsFinancial Health
StrongStrong · Growing · 0% CAGR over 4y
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Computed from 5 filingsFinancial Health
StableStable · Hiring · 32% CAGR over 4y
Location
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Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
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Computed from 5 filingsFinancial Health
HealthyHealthy · Growing · 0% CAGR over 4y
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Computed from 5 filingsFinancial Health
StrongStrong
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Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
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Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 1y
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Computed from 5 filingsFinancial Health
StableStable
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Computed from 4 filingsFinancial Health
DistressedDistressed
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Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
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Computed from 4 filingsFinancial Health
StableStable
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How Swansea Utilities companies work and how to sell to them
What they do
Utilities suppliers around Swansea usually earn revenue through recurring service contracts, usage-based charges, scheduled maintenance fees and reactive call-outs. Some act as hands-on operators, sending engineers or crews to sites; others manage metering, environmental handling, infrastructure support or supply administration. Pricing tends to follow the risk and regularity of the work: a single site visit may be quoted as a job, while larger commercial or public-sector arrangements are usually tendered, renewed and governed by service levels. Gross margin is often tied to route density, technician utilisation, equipment uptime and the cost of insurance, disposal, energy or subcontracted capacity.
Who they sell to
Their customers are typically local authorities, housing providers, commercial landlords, industrial sites, facilities managers and residential customers needing essential services rather than discretionary projects. Estates, operations and procurement teams often shape the shortlist, with finance checking recurring cost and contractual exposure. Owner-managed buyers may purchase directly after a site visit, while public-sector and larger industrial accounts tend to use frameworks, approved supplier lists or formal tenders. Sales cycles therefore vary: reactive work can convert quickly, but planned maintenance, waste handling, metering or network support usually needs method statements, insurance evidence, references and agreement on access windows before an order is placed.
What they buy
Most firms in this segment tend to spend on tools that make field work auditable: job scheduling, mobile workforce management, asset records, vehicle tracking, customer communications, invoicing and document control. Compliance support is also a common need, including health and safety advice, environmental permitting support, insurance broking, training, tender writing and quality management. Smaller operators may still run parts of the business through spreadsheets and email, which leaves room for finance systems, billing automation and customer relationship management. Operational purchases are just as relevant as software: vehicles, tools, protective equipment, storage, monitoring devices and subcontracted technical labour all sit close to revenue delivery.
Why and how to sell to them
Utilities buyers tend to evaluate suppliers when operational pressure makes manual coordination costly: a new contract, a tender deadline, a service failure, an insurance review, a move into more regulated work or the first layer of management above the founder. Outbound works better when it starts with the consequence they recognise: missed visits, weak evidence packs, slow invoicing, uncertain margin by job, or too much time spent assembling tender documents. The sharper angle is usually risk reduction and recoverable admin time, not abstract growth. For early conversations, ask which contracts they want to retain, which bids they cannot yet support, and where site evidence slows payment.
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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