Solar panels for cold storage in Cardiff

A guide to Cardiff and the wider South Glamorgan area, including Penarth, Caerphilly, Barry.

Why solar PV makes sense for Cardiff cold storage operators

Cardiff is the commercial capital of Wales and the distribution hub for the whole of the south of the country. The M4 runs along the northern edge of the city, and the industrial estates that gather around it carry South Wales’s chilled and frozen logistics, serving the regional grocery network, food manufacturers and the foodservice trade across the valleys and the coast. Refrigerated warehouses run their plant continuously, day and night, a load profile that tends to suit rooftop solar well. A cold store tends to use most of what its roof can generate, so the panels offset grid electricity at the full retail rate rather than exporting cheaply.

A typical Cardiff commercial site averages around £38,000 a year on electricity, but a refrigerated facility runs far higher, often into the hundreds of thousands, because continuous cooling is so energy-intensive. Network charges (TNUoS and BSUoS) are a component of the delivered price of South Wales electricity and change each year, and every kilowatt-hour generated and used on site avoids both the energy and the network components. For a 24/7 cold store, the illustrative model assumes a high share of generation (about 90%) is used on site, and the payback is sensitive to that assumption: illustratively four to five years in the site’s simple model (assumed tariff and self-consumption; not a quote). Test it against twelve months of half-hourly meter data.

Cardiff’s cold chain geography, where the roofs are

The city’s industrial heart lies to the east, where the Wentloog Industrial Estate and Capital Business Park sit beside the M4 and the Cardiff to Newport corridor. Wentloog is one of the largest distribution and logistics concentrations in South Wales, with clear-span warehouses well suited to solar. Cardiff Bay Business Park and Hadfield Road to the south carry the waterfront industrial stock, while Pengam Green to the east adds further depth.

The buildings span the range, from older dock-era and industrial stock with asbestos cement roofs that need a combined re-roof before solar, to modern composite-panel cold stores ready for a ballasted array. Buildings near Cardiff Bay and the coast may need marine-grade fixings against the salt air. Beyond the city, the cold storage that supplies Cardiff reaches east toward Newport and the wider M4 corridor, west toward Barry and the Vale of Glamorgan, and north into the valleys. Many Cardiff operators run portfolios across these areas, so consistent quality matters throughout.

Local policy and planning context for Cardiff cold stores

Cardiff Council and the Welsh Government each publish their own climate commitments and business-support schemes. This page does not cite them, so check the current position, and any grant support open to SMEs, with each of them before building them into a business case.

Planning is devolved in Wales, so the England-only Class J rules do not apply to a Cardiff cold store. The Welsh route for solar on non-domestic buildings is Part 43 of the Welsh permitted-development Order, which has its own separate limits and conditions, so check the current text and the council’s position before relying on it. The Business Wales grant landscape changes year to year, so check current eligibility before relying on any of it.

Local cost data: illustrative figures for Cardiff cold storage

A mid-sized Cardiff refrigerated facility might illustratively spend £65,000 to £290,000 a year on grid electricity (a modelling assumption, not a survey of bills), with the larger distribution hubs serving the South Wales grocery network running above that. South Wales tariffs include network charges that change each year, and the continuous load of refrigeration leaves no off-peak window to exploit.

For a Cardiff cold store solar install in 2026, indicative cost per kilowatt sits at:

• An illustrative £750 to £950 per kW (a modelling assumption, not a quote or a market survey) for systems of 400 to 800 kW, the single-facility case used in the model
• A modelled £700 to £850 per kW for systems above 1 MW at the larger distribution hubs
• A modest premium for marine-grade fixings on bay-side buildings near salt air

As an illustration, a Cardiff limited company claiming the Annual Investment Allowance (100% relief on up to £1,000,000 of qualifying spend) could set most of the cost of a system against profits in the first year, an effective tax saving of up to 25% in year one. Our cost guide sets out the detail, and the grants and funding page explains how the allowances work. The Industrial Energy Transformation Fund closed in July 2025 and no successor fund is planned, so it cannot be counted on; check GOV.UK for any scheme open now. The longest item on a Cardiff project is the National Grid Electricity Distribution G99 connection, so the application is best made early.

An illustrative Cardiff project, a Wentloog chilled distribution centre

Consider a chilled food distribution centre at Wentloog, beside the M4, serving the South Wales grocery network. The building is a clear-span steel-portal structure of around 4,500 square metres, running multi-temperature chambers around the clock for early-morning deliveries into regional supermarkets and the valleys. Annual grid consumption sits near 1.05 million kWh, dominated by refrigeration.

In this illustrative case, a 580 kW rooftop array across the usable roof would be expected to generate roughly 530,000 kWh a year in the South Wales climate. The model assumes a high share of generation (about 90%) is used on site because the refrigeration never stops, so most of that generation would displace grid electricity at the full retail rate; test that against twelve months of half-hourly meter data. At assumed South Wales tariffs that would be around £112,000 a year saved, an illustrative simple payback inside five years in the site’s simple model (assumed tariff and self-consumption; not a quote). A design of this kind might use a non-penetrating ballasted mount to protect the insulated roof, with structural loading verified against the building’s capacity. Before design, ask the site’s insurer and a fire-protection engineer about roof loading, clearances and sprinkler compatibility.

Postcodes and industrial areas across Cardiff

Cold storage solar is relevant across all Cardiff postcode districts, with the heaviest demand in the industrial belts:

• East: CF3 around Wentloog Industrial Estate and Capital Business Park, the city’s largest distribution cluster
• South: CF10 and CF11 around Cardiff Bay Business Park and Hadfield Road
• East-central: CF24 around Pengam Green and the inner industrial estates
• North: CF14 and CF15 industrial pockets serving the northern suburbs
• Outer: CF23 around the eastern fringe for larger distribution sites

Because the array goes on the roof, installation takes place above the cold chain, so refrigeration and despatch can carry on.

Other cold storage areas adjoining Cardiff

The cold storage that supplies Cardiff extends across South Wales and the M4 corridor, and many operators run several sites. Refrigerated warehouse solar is also relevant in:

• Newport, the M4 corridor distribution and the Imperial Park logistics concentration
• Barry, the Vale of Glamorgan food and chilled logistics and the dock-side cold stores
• Caerphilly, the valleys distribution serving the north of the region
• Pontypridd, the Treforest industrial estate and the valleys food trade
• Bristol, the wider South West cold chain across the Severn to the east

Each falls under a different local authority, so planning decisions are made site by site across a South Wales portfolio.

Frequently asked questions about Cardiff cold storage solar

Do the Welsh public-sector targets help my cold store business case? They can. The Welsh Government’s drive for public-sector net zero by 2030 means demonstrable carbon reductions increasingly count in procurement. If your cold store serves the NHS in Wales, councils or public-sector caterers, on-site solar is auditable evidence of Scope 2 reduction.

How long does the grid connection take in Cardiff? National Grid Electricity Distribution is the DNO across South Wales, and G99 connection timescales for larger systems run several months on capacity-constrained parts of the network. The application is normally submitted immediately after survey.

Can I install on a leased cold store at Wentloog? Yes. Tenant solar is standard practice and needs landlord consent, granted by most institutional landlords under the BBP Green Lease Toolkit. For shorter leases a power purchase agreement is often the better route. The landlord should be engaged early.

Do bay-side cold stores need special fixings? Buildings near Cardiff Bay and the coast should use marine-grade fixings to resist salt-air corrosion. A site’s exposure should be assessed and the fixings specified accordingly.

Send an enquiry about your Cardiff cold storage solar project

This guide looks at commercial solar across Cardiff and the wider South Wales cold chain, from Wentloog to Cardiff Bay, from Capital Business Park to the M4 corridor. A desk-based first assessment built from half-hourly meter data and roof drawings can give an indicative system size, generation forecast and internal rate of return before any site visit.

If the numbers work, the next step with an installer is usually a structural and electrical survey, followed by a proposal with yield modelling and contract terms. A sound proposal is honest about roof condition, salt-air exposure and grid connection, and says plainly if a site does not suit solar. Send an enquiry and we reply by email.