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Utilities Companies in Cardiff: 132 Active Firms (2026)
Utilities companies in Cardiff provide essential energy, water and infrastructure services across the city and surrounding metropolitan area.
Buying decisions usually sit with estates, facilities, finance and public-procurement teams rather than discretionary software or marketing budgets. Cardiff utilities operators and service providers sell into commercial, public-sector, residential and mixed customer bases, often where reliability, compliance and local asset access matter more than market profile. The buying centre differs by activity: metering and billing work leans towards finance and customer operations, grid and infrastructure support towards engineering and estates, and water or energy services towards facilities management. Engagements tend to be contract-led and operational, with lean delivery teams, recurring service obligations and procurement cycles that require evidence of insurance, licences and delivery capacity.
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Cardiff has 132 utilities firms actively trading, making this a compact local cohort rather than a broad national utilities cluster. The employment footprint is also modest: reported headcount across the cohort totals 294 people, pointing to a market weighted towards lean operators, subcontracted delivery and specialist service businesses rather than labour-heavy municipal-scale providers. The presence of firms at different stages matters for list use: some will be regulated asset or infrastructure operators, while others sit closer to metering, maintenance, connection support or commercial utility services for customers across Cardiff’s metropolitan area.
Regulatory exposure depends less on the utilities label than on whether a firm owns assets, supplies customers directly, handles metering, or provides contracted infrastructure services. Energy-facing businesses tend to deal with licensing, network access, metering accuracy and customer-treatment rules; water and infrastructure providers face service continuity, environmental compliance, asset maintenance and public-procurement scrutiny. Cardiff adds a local infrastructure layer, with operators serving dense urban sites as well as nearby commercial and residential districts. Where firms support rather than own assets, compliance still shapes tender eligibility, insurance requirements and the evidence customers expect before awarding recurring work.
Cardiff’s utilities cohort appears likely to evolve through operational specialisation rather than a simple expansion story. A small revenue-scaled subset sits alongside many lean service providers, so buyer targeting tends to favour activity type and contract exposure over headcount alone. Firms with metering, maintenance, connection support and infrastructure-service models may remain attractive to larger operators seeking local delivery capacity. Regulation and customer-service expectations tend to favour businesses that can document resilience, billing accuracy and incident response. Consolidation, where it happens, is more likely to follow framework wins, subcontracting relationships and asset-maintenance demand than consumer-facing competition.
132
Active firms
2026
5
Over £5M
Annual revenue
30
Recent incorporations
Since 2022
Key facts
About 3% of the trading cohort reports turnover above £5M (5 of 132 firms) — the rest sits below that revenue band.
22% of the cohort was incorporated since 2022 (30 firms), so a sizeable share is in its first few filing cycles.
Cardiff utilities providers cover energy, water and infrastructure services across the city and surrounding metropolitan area.
These suppliers sit early in the local B2B spending chain, because commercial premises need power, water, connections and maintenance before many other services.
The local market appears to mix service operators, infrastructure managers and asset-led entities rather than a single operating model.
Contracting models, asset ownership and outsourced delivery tend to matter when assessing utilities operators.
Top Cardiff Utilities companies
Provides energy infrastructure, smart metering installation and management, and gas and electricity data services. Also delivers energy management, demand flexibility and project delivery services to…
Serves UK energy suppliers, utilities, industrial and commercial organisations, public sector bodies and domestic consumers involved in energy generation, supply and consumption.
Location
TRYDAN GWYRDD CYMRU LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops and delivers renewable energy generation projects, including onshore wind farms, solar farms and battery energy storage systems. Works with public sector partners and stakeholders to plan,…
Serves Welsh public sector bodies, local communities and stakeholders involved in public-estate renewable energy projects, with benefits intended for people living and working across Wales.
Financial Health
HealthyHealthy · Hiring · 80% CAGR over 1y
Location
Develops and promotes onshore wind energy parks. Plans and manages renewable energy projects, including site development, consultation and planning applications, to generate electricity from wind and…
Serves energy-sector and public stakeholders in Wales, including local communities, groups and services involved in renewable energy parks, community benefit funding and decarbonisation projects.
Location
Eureka Water Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
JUST TANKERS HOLDINGS LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
LIQUILINE WATER SERVICES LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
LIQUILINE WATER TANKER HIRE LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
Eventloos Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
Trajectory
4y · 2019–NowFinancial sub-scores
Computed from 4 filingsSupplies domestic gas and electricity to residential customers, offering smart meter‑based tariffs, prepayment top‑ups, and account management via a mobile app. Provides energy switching, billing and…
Serves residential energy customers, including households using smart meters, prepayment/top-up accounts and dual-fuel gas and electricity, with support for customers eligible for the Warm Home…
Financial Health
StableStable · 0% CAGR over 5y
Location
GREEN FROG POWER LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsBuilds and operates fast‑start power stations supplying standby and peak electricity to the national grid. Develops and delivers power generation projects including gas‑fuelled peaking plants and…
Sells to National Grid and UK wholesale energy-market counterparties, serving grid operators and electricity-market buyers that require standby generation capacity.
Financial Health
WeakWeak · Hiring · 12% CAGR over 3y
Location
Sutro Group Ltd
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides infrastructure inspection services using rope access, drones, robotics and non-destructive testing. Conducts asset integrity assessments for water utilities, oil and gas, power generation,…
Serves B2B asset owners and operators in water utilities, oil and gas, power generation and renewables, particularly teams responsible for critical infrastructure, industrial facilities and…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
MPC Water Treatment Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides installation, maintenance, repair and monitoring of septic tanks, sewage treatment plants and pump stations. Offers tankering and desludging, drainage works, system health checks, compliance…
Serves UK homeowners, property managers, developers, commercial customers and municipal water company supply chains needing support for off-mains drainage, septic tanks, sewage treatment plants and…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Drainmen Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
WP GRID STORAGE 5 LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops, constructs and manages distributed energy assets including gas‑fired peaking plants, grid stability infrastructure and battery storage projects, providing flexible power generation and…
Serves B2B energy asset owners, developers and infrastructure investors with flexible generation, grid stability and battery projects for electricity networks across the UK.
Financial Health
StableStable
Location
GREENS H2O HIRE HOLDINGS LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
BULK WATER DELIVERYS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
JUST TANKERS HIRE LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
LIQUILINE ROAD TANKER HIRE LIMITED
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
JUST TANKERS ROAD TANKER LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
WATERMILLS FESTIVALS AND EVENTS LIMITED
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
LIQUILINE WATER TANKER SERVICES LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
LIQUILINE WATER SUPPLY LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
GREENS H2O ROAD TANKER HIRE LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
JUST TANKERS WATER SERVICES LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
WATER TANKERS LONDON LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
EMERGENCY BULK WATER TANKER LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
GREENS H2O WATER SERVICES LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
Ecogen Innovations Ltd
Trajectory
1y · 2025–NowDevelops renewable energy systems including waste-to-energy plants that convert municipal waste into electricity, hybrid solar‑wind microgrids with battery storage, modular off‑grid power units, and…
Serves government agencies, municipalities, hospitals, community leaders and businesses needing clean energy infrastructure, including towns, industries, remote or off-grid communities, disaster…
Financial Health
Insufficient historyInsufficient history
Location
SML ELECTRICAL & MAINTENANCE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
VALE BIO-ENERGY LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StrongStrong
Location
OCTO PARTNERS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -50% CAGR over 5y
Location
CCCT SERVICES LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
HyHaul Mobility Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
Sustainable Energy
Provides engineering and consultancy services for renewable and low‑carbon energy systems, including district heating and decentralised energy networks. Services cover energy masterplanning,…
Serves public sector bodies, large utility companies and organisations developing renewable, low-carbon and district heating projects across the UK, including decentralised energy and…
Location
Operates and maintains a gas distribution network, transporting natural gas through pipelines to homes and businesses. Provides new gas connections, pipe upgrades and alterations, emergency gas…
Serves households, businesses, property developers and third-party utility providers across Wales and south west England, including vulnerable or priority customers needing gas network support.
Location
Operates and maintains a natural gas distribution network, managing pipelines that deliver gas to homes and businesses. Provides gas connections for new developments, upgrades and replaces gas mains,…
Serves domestic households, businesses, property developers and contractors across Wales and south west England, including customers needing new or altered gas connections and vulnerable customers…
Location
VALLEY WATER SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides water infrastructure and utility engineering services including water mains renewal, pipe repairs, moling and leak detection, vacuum excavation, hydrant renewal, chamber construction,…
Serves a mix of residential customers, property owners, developers, construction contractors and utility-sector clients in South Wales and South West England.
Financial Health
HealthyHealthy · -73% CAGR over 4y
Location
D P CABLE JOINTING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides high- and low-voltage cable jointing and electrical utility contracting services. Carries out cable installation, jointing, pulling and repairs, substation installations, private network…
Serves B2B clients in electrical utilities, energy infrastructure and construction, including ICPs, residential site developers, EV charging projects and private network operators in Wales and South…
Financial Health
StableStable · Hiring · 61% CAGR over 2y
Location
Wales & West Utilities
Operates and manages a gas distribution network, maintaining pipelines that deliver natural gas to homes and businesses. Provides gas connections, network upgrades, emergency response for gas leaks,…
Serves households, businesses, developers, vulnerable customers and third-party utility providers across Wales and south west England that rely on the regional gas network.
Location
NEWCONN CONTRACT SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering and contracting services for electricity networks, including overhead line installation and maintenance, wood pole installation and inspection, 11kV and low‑voltage cable laying,…
Serves electricity utilities, DNOs, commercial and industrial organisations, local authorities, construction firms and housing providers across Wales, the South West and Midlands.
Financial Health
WeakWeak · -4% CAGR over 4y
Location
CMU INFRASTRUCTURE LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides gas infrastructure installation and connection services for housing developments and industrial or commercial projects. Services include pipeline installation, steel and hot-tap connections,…
Serves property developers, housebuilders, industrial and commercial organisations, and existing housing customers requiring gas and utility infrastructure connections with UK gas network owners.
Financial Health
WeakWeak · -9% CAGR over 3y
Location
DANSCO UTILITIES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -7% CAGR over 4y
Location
BUSINESS ENERGY ADVISORS LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
DNO Consulting Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides high‑voltage engineering services including the design, manufacture and installation of electrical substations. Operates as an Independent Connection Provider delivering grid connection…
Serves B2B electricity infrastructure clients, including DNOs, IDNOs, renewable energy developers and organisations needing customer substations or grid connections for high-voltage projects.
Financial Health
StableStable · Profitable · -7% CAGR over 2y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides energy and water metering systems, including smart meters, sub‑metering and automated meter reading (AMR). Supplies, installs and commissions metering equipment, offers meter data analysis…
Serves organisations with substantial building, process or industrial utility usage, including universities and colleges, hospitality sites, utilities, cultural venues, and public-sector bodies…
Financial Health
HealthyHealthy · Hiring · 4% CAGR over 3y
Location
THE VICTORIA (ABERGAVENNY) LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides civil engineering and infrastructure services including construction works, groundworks and trenchless technology projects. Offers plant and machinery hire and carries out multi‑utility…
Serves construction firms, utilities providers, infrastructure developers and contractors needing civil engineering, groundworks, network works or plant hire across Wales and the South West.
Financial Health
DistressedDistressed
Location
TGG Solutions Ltd
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
EATON ENVIRONMENTAL SERVICES (HOLDINGS) LIMITED
Trajectory
5y · 2022–NowFinancial Health
Insufficient historyInsufficient history
Location
K M PLANT HIRE & GROUNDWORKS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and groundworks services for construction and utility projects, including multi‑utility mains installation, network repair and maintenance, trenchless engineering, EV…
Sells to businesses and infrastructure project buyers in construction, civil engineering and utilities, including organisations needing plant hire, groundworks, multi-utility installation and network…
Financial Health
HealthyHealthy · -77% CAGR over 4y
Location
Redwood Environmental Services Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides waste management and drainage services including liquid waste removal and treatment, septic tank and cesspit emptying, drain cleaning, and CCTV drain surveys and inspections. Operates…
Serves homeowners, landlords, commercial property operators and industrial sites, with emphasis on domestic, commercial and industrial customers in South Wales, the South West and wider UK.
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
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How Cardiff Utilities companies work and how to sell to them
What they do
Cardiff utilities businesses usually earn through recurring supply or service contracts, usage-linked charges, standing fees, connection work, metering support, maintenance visits and infrastructure project work. The product shape is often operational rather than purely digital: field crews, engineering capability, billing processes, customer support and evidence of service continuity all sit close to the revenue model. Smaller engagements may look like call-outs, meter work or site-level maintenance, while larger work is tied to multi-site contracts, public-sector frameworks or long-running asset-support agreements. Pricing tends to mix fixed service fees, consumption-linked elements, call-out rates and tendered schedules of rates.
Who they sell to
Most sell to organisations that treat utilities as an operating necessity rather than a discretionary purchase: housing providers, commercial landlords, public bodies, contractors, facilities managers, developers and multi-site businesses. Decision-makers tend to include heads of estates, facilities directors, finance leads, procurement teams, engineering managers and customer operations leaders. Smaller jobs can be bought directly by site or facilities teams, especially where a local supplier is already approved. Larger contracts usually move through tender portals, framework agreements, RFP-style procurement or partner-led subcontracting, with longer checks on insurance, accreditations, service coverage, response times and pricing assumptions before award.
What they buy
Most utilities firms tend to spend on tools and services that reduce operational friction: field-service scheduling, asset registers, mobile job management, metering workflows, billing systems, finance software, customer communications, document control and compliance evidence. Infrastructure-led firms may also buy telemetry equipment, fleet services, plant hire, health and safety training, inspection services, insurance advice and specialist legal support for contracts or disputes. Lean local teams often need outsourced accounting, payroll, recruitment, marketing for tender visibility and IT support, but the spend case normally has to connect back to fewer missed visits, faster invoicing, lower service risk or better evidence for customers.
Why and how to sell to them
Commercial pain is usually clearest around billing accuracy, late payment, missed visits, tender admin, incident response, subcontractor coordination and proving that service obligations have been met. Buying triggers include winning a new framework place, taking on a multi-site customer, adding field staff, replacing manual scheduling, handling a service failure, or preparing for a renewal where customers ask for clearer reporting. Only 5 Cardiff utilities firms sit above £5M turnover, so enterprise-style pitches need a precise operational payback. The 30 firms incorporated since 2022 may be more open to basic finance, workflow and compliance systems, provided implementation does not interrupt delivery.
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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