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Battery Storage Companies in Cardiff: 25 Active Firms (2026)
Battery storage companies in Cardiff develop and operate grid-scale batteries and flexibility services for electricity networks across the city region.
Buying decisions tend to sit with network-facing energy teams, renewable-site owners, commercial landlords, industrial energy users and public-sector estates rather than domestic consumers. Work is usually project-led: connection studies, asset development, operational optimisation, maintenance, trading support and flexibility-service participation. Cardiff firms in this niche appear to cluster around small to mid-market engineering, developer and asset-management models, with engagement sizes shaped by grid constraints, site control and the ability to combine batteries, power electronics and energy-management software into bankable operating cases.
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Cardiff has 25 actively trading battery storage companies, making this a narrow local cohort rather than a broad energy-software market. Reported employment across the cohort is 48 people, which points to a base dominated by compact operators, consultancies and project vehicles rather than labour-intensive manufacturers. The commercial centre of gravity appears to be South Wales power infrastructure: grid connection work, flexibility services, renewable co-location and energy management for public and industrial estates around the city region.
Grid-facing battery storage sits in a market shaped by connection queues, planning consent, network charging, capacity obligations and balancing-service qualification. For Cardiff operators, the practical constraint is often less the battery chemistry than the ability to secure a usable grid position and a contract stack that can support the asset. Public-sector estates and industrial users add procurement and site-risk disciplines, while flexibility revenues depend on operational reliability and eligibility for network and system-balancing services.
Commercial development appears likely to favour firms that can combine development capability with operational discipline, rather than pure project origination. The cohort looks early-commercial in shape, with many businesses likely to remain specialist advisers, project companies or local asset managers. Consolidation may come from operators seeking grid positions and planning progress, while smaller engineering-led firms may continue to sell services into developers and estates. Revenue quality, connection certainty and route-to-market will matter more than broad claims about storage demand.
25
Active firms
2026
2
Above £5M
Reported revenue
6
Newer firms
Incorporated since 2022
Key facts
About 8% of the trading cohort reports turnover above £5M (2 of 25 firms) — the rest sits below that revenue band.
24% of the cohort was incorporated since 2022 (6 firms), so a sizeable share is in its first few filing cycles.
Cardiff battery-storage firms sit close to electricity-network constraints, where asset dispatch and route-to-market choices shape project economics.
The local market includes asset-owning and project-finance models, rather than only labour-intensive services businesses.
Flexibility services link battery assets to balancing requirements across the UK electricity market.
Top Cardiff Battery Storage companies
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
SERO TECHNOLOGIES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides retrofit and energy services for social housing, installing technologies such as solar panels and batteries and managing smart energy use. Aggregates homes to purchase electricity and…
Serves social housing landlords and their residents, plus institutional investors and funders seeking climate and social impact from retrofit programmes in the UK housing sector.
Financial Health
StrongStrong · Hiring · 19% CAGR over 4y
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
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
Nuvolt Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs commercial renewable energy systems including solar PV, battery storage and electric vehicle charging infrastructure. Provides consultancy, system design, installation and…
Serves UK businesses, commercial property operators, EPC contractors, and organisations with commercial, domestic or public charging facilities seeking low-carbon energy infrastructure.
Financial Health
StrongStrong · Hiring · 73% CAGR over 2y
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
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops, delivers and operates grid-scale battery energy storage systems (BESS). Procures and manages fast-response storage projects that store electricity and provide grid-balancing services,…
Serves UK power-sector stakeholders, infrastructure investors and mixed-use development partners involved in grid-scale battery storage, private-wire, micro-grid and EV charging projects.
Financial Health
WeakWeak
Location
TEWDRIC ENERGY CYMRU LTD
Trajectory
1y · 2025–NowDesigns and installs solar photovoltaic (PV) systems, battery energy storage, and electric vehicle charging points for homes, businesses, and community projects, providing on‑site renewable…
Serves homeowners, businesses, councils, housing associations and local community groups across South Wales seeking solar, battery storage and EV charging solutions.
Financial Health
Insufficient historyInsufficient history
Location
Infinite Renewables Wales Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDesigns, develops and manages renewable energy projects including wind, solar and battery storage systems. Supplies wind turbines and microgrid solutions, and provides consultancy, asset management,…
Serves businesses and organisations seeking renewable energy infrastructure, including industrial sites, sustainability teams, remote or off-grid operators, and international project partners.
Financial Health
WeakWeak · 0% CAGR over 1y
Location
MODERN ENERGY AND ELECTRICAL SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls and maintains solar energy systems, battery storage and electrical installations for residential, commercial and industrial properties. Provides electrical contracting, renewable energy…
Serves homeowners, commercial businesses and industrial clients seeking renewable and electrical project support, with stated coverage across South Wales, the West and nationwide.
Financial Health
StrongStrong
Location
Off Grid Engineering Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs off‑grid power systems using solar PV, battery storage and generators. Provides system design, turnkey installation, upgrades, and remote monitoring for homes, businesses and…
Serves homeowners, self-builders and rural property owners, plus businesses with remote sites such as workshops, holiday lodges and commercial premises needing off-grid power systems.
Financial Health
StableStable · 0% CAGR over 4y
Location
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How Cardiff Battery Storage companies work and how to sell to them
What they do
Cardiff battery-storage firms usually make money from project development fees, engineering consultancy, asset-management retainers and operating revenue linked to flexibility services. Some take fees for feasibility work, connection strategy, planning support and procurement management; others own or manage storage assets and earn from contracted availability, balancing participation and optimisation of power flows around renewables or high-load sites. Hardware margin may exist where batteries, inverters and metering are supplied, but many small operators sit closer to services and controls than manufacturing. Only 2 have crossed £5M turnover, so pricing is likely to be bespoke, milestone-based and tied to site risk rather than standard subscription bundles.
Who they sell to
Typical buyers are asset owners and energy-intensive organisations: renewable-site developers, commercial landlords, industrial energy users, local authorities and estates teams that need lower exposure to grid constraints or better use of on-site generation. Decision makers tend to include energy managers, estates directors, finance leads, technical directors and procurement teams, with network-facing specialists influencing the specification. Smaller advisory jobs may close through direct relationships, while asset development, public-sector work and long-term operations contracts usually require tendering, due diligence and board-level approval. Sales cycles are often governed by connection milestones and planning risk, so a technically interested buyer may still move slowly until site control and revenue assumptions are clearer.
What they buy
Most Cardiff battery-storage firms tend to spend on grid studies, planning advice, legal support, financial modelling, insurance and metering before they buy general business software. Operating assets then bring demand for monitoring, controls, forecasting, cyber security, maintenance scheduling, incident management and market-settlement workflows. Developer-led firms may also need land and lease support, project finance advice, geospatial tools, document management and bid support for public or industrial customers. Compact teams often outsource accounting, HR, recruitment and specialist engineering rather than building permanent departments, so services providers need a clear link to project milestones, operational availability or financeability.
Why and how to sell to them
Battery storage buyers tend to evaluate vendors when a connection offer changes, a site moves from option to development, an asset starts trading, or an estate owner asks for evidence that storage will reduce cost and risk. Other triggers include new leadership, a capital raise, a public-sector tender, hiring for operations roles or a move from consultancy into asset ownership. Outbound works better when it names the operational constraint: queue delays, uncertain revenue stacking, battery availability, reporting to lenders, fire-risk governance or procurement paperwork. Generic decarbonisation language is less useful than showing where a supplier removes friction between engineering, finance and commercial operation.
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.
Sources
- July 2024: Battery energy storage research round-up
- 141 individual battery units make up 4.1 GW of battery energy storage capacity currently operating in Great Britain.
- Q2 2024 saw 186 MW of new battery energy storage capacity begin commercial operations in Great Britain.
- The first half of 2024 added 370 MW of new operational battery energy storage capacity, the lowest since 2022.
- 1.4 GW of non-operational sites hold Capacity Market contracts for 2024/25, with 1.1 GW expected operational in Q3 2024.
- In the most optimistic case, operational battery energy storage capacity would reach 5.2 GW at the end of 2024, 1.5 GW below pipeline capacity.
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