Solar panels for refrigerated warehouses and cold chain stores

Why cold chain warehouses tend to suit solar

This is the heart of solar panels for cold storage. A refrigerated warehouse runs its plant around the clock, and that constant demand tends to suit solar better than a daytime-only ambient load. Refrigeration compressors, condenser fans, lighting and controls draw power day and night, so the electricity your panels generate is likely to be consumed on site rather than exported at a lower price. Self-consumption is the single biggest driver of solar payback, and the illustrative model assumes a high share of generation (about 90%) is used on site; test that against twelve months of half-hourly meter data. Because grid electricity is a major operating cost in the cold chain, and cold storage is very electricity-intensive, every kWh the panels offset reduces the bill.

The result is an illustrative simple payback of around 4.5 years in the site's simple model (assumed tariff and self-consumption; not a quote), which is sensitive to the self-consumption assumption. The wider picture is worth weighing. F-gas Regulations are driving heat-pump retrofits across the cold chain, and PV can pair with that electrification by supplying daytime power to the new plant. At the same time, customer Scope 2 and Scope 3 mandates flow through to operators, and customer and audit schemes may ask about energy use and resilience; check the relevant standard. Solar can provide auditable evidence of Scope 2 reduction, so it can help in the supply chain as well as on the meter. Network charges (TNUoS and BSUoS) are a component of the delivered electricity price and change each year, and every kWh generated and used on site avoids the energy and network components.

What a typical install looks like and how it is sized

A cold chain warehouse system typically sits in the 400 to 1,800 kW range, which is roughly 740 to 3,300 panels across about 2,400 to 10,800 square metres of roof. In the illustrative model a system that size would be expected to generate in the region of 370,000 to 1.65 million kWh a year and save somewhere between 85 and 380 tonnes of CO2 annually. A 24/7 refrigeration load tends to suit sizing against the baseload, because the model assumes a high share of generation (about 90%) is used on site, an assumption to test against half-hourly meter data before sizing.

The half-hourly meter data should still be pulled first to confirm the load, but the constant refrigeration demand means very little of what is generated goes to waste, and there is rarely the low-baseload trough between peaks that you see on an ambient distribution centre. Roof area is rarely the binding constraint; the real limits are the existing electrical baseload and DNO capacity. Because the load is so steady, batteries are usually less central to a cold-store design than they are on a daytime-only operation, since the panels' output is absorbed in real time by the plant. Close attention to the roof itself is needed during sizing, because cold stores are typically built from insulated panel construction and the mounting approach has to protect that envelope, which can influence how the array is laid out. The aim is a system tightly matched to the building's genuine round-the-clock demand.

Costs, payback and tax relief

In the site's illustrative model a cold chain project lands between £280,000 and £1.45m depending on system size, at an illustrative £700 to £900 per kW (a modelling assumption, not a quote or a market survey). Illustrative simple payback is near 4.5 years in the site's simple model (assumed tariff and self-consumption; not a quote), after which the electricity is effectively free for the rest of the system's long life. The biggest financial lever is tax: solar PV qualifies as plant and machinery, so the 100% Annual Investment Allowance lets most installs claim the full cost as relief in year one up to the £1m cap, with a 50% First Year Allowance on qualifying spend above, subject to current legislation. As an illustration, for a limited company the Annual Investment Allowance relief is worth up to a quarter of the project value back as tax saved in year one.

Because the illustrative model assumes a cold store uses most of what it generates on site, the return is driven by avoided import rather than export, which is the stronger position to be in. The Smart Export Guarantee applies to generators up to 5 MW and the supplier sets the export rate, so compare each supplier's published SEG tariff; on a 24/7 refrigerated building exports are minimal by design, so it is a minor line. The combination of a short modelled payback, a major operating cost being addressed, and first-year tax relief is why the illustrative model shows a short payback on PV capex for a cold store.

It is worth being clear about why the modelled cold-store payback differs from an ambient warehouse. On an ambient warehouse, a good slice of midday generation may be exported at the lower Smart Export Guarantee rate because the daytime load dips between order peaks. On a cold store, the refrigeration plant is drawing power at midday just as it is at midnight, so the panels tend to offset electricity you would otherwise have bought at the full grid retail price, which includes network charges as a component. In the site's simple model that difference in on-site use is what separates the illustrative 5.5-year ambient case from the 4.5-year cold-store case (assumed tariff and self-consumption; not quotes). The same logic means a cold store is less exposed to changes in export tariffs, because so little of its generation is exported. See the cost guide for worked numbers at cold-store scale.

Funding routes in detail

The Industrial Energy Transformation Fund (IETF), which was operated by DESNZ, closed in July 2025 and no successor fund is planned, so it cannot be counted on; check GOV.UK for any scheme open now.

Instead, capital allowances are the core relief, with most installs claiming full first-year relief under the Annual Investment Allowance and the 50% First Year Allowance covering qualifying spend above the cap. Where the building sits in a Freeport or Investment Zone, Enhanced Capital Allowances are worth checking. Tenants can use the Green Lease Clause and tenant capital recovery route, usually supported by a BBP-aligned lease addendum, which unlocks installation on a leased building with landlord consent. The Smart Export Guarantee covers any export. Check GOV.UK for any grant open at the time of purchase, because where one applies it can materially change the numbers.

Compliance and sector considerations

Two compliance points are specific to cold storage. First, F-gas Regulation 2014/517 governs the refrigeration plant, and a PV design should respect it and work with any heat-pump retrofit programme rather than against it, so the PV supports the electrified plant the regulation is pushing operators towards. Second, roof penetration design must respect the integrity of the insulated panel construction; mounting approaches should protect the insulated envelope and avoid compromising the thermal performance of the building, because a poorly detailed fixing on a cold-store roof is a thermal-bridge and condensation risk as well as a watertightness risk.

Beyond that the standard logistics regime applies: sprinkler clearances and insurer pre-design review (ask the site's insurer and a fire-protection engineer about roof loading, clearances and sprinkler compatibility before design), and, in England, permitted development under Class J of Part 14 of the GPDO 2015 for roof-mounted solar on a non-domestic building. A cold-store array is usually above 50 kW, and an array above 50 kW needs the council's prior-approval decision on design and external appearance, including glare. On the grid side, G98 'connect and notify' covers up to 16 A per phase (3.68 kW single-phase, about 11 kW three-phase); above that a G99 application and the network operator's approval before connecting are needed, and at the scale of a cold store (hundreds of kW) it is always G99. Wind loading should be designed to BS EN 1991-1-4 for the specific terrain category, and ballasted systems weighted for the worst-case uplift at the site. Solar does not interfere with food-safety audits; customer and audit schemes may ask about energy use and resilience, so check the relevant standard, and a working PV array can provide evidence of Scope 2 reduction that sits naturally in the same documentation pack. Where fire detection integration is involved, that work should meet BS 5839-1 and SPF1981 v3 fire safety design, and insurer sign-off on the layout should be obtained before anything is fabricated.

How this kind of project is typically approached

Cold storage should be treated as a specialism, not a variation on an ambient warehouse. A sound project starts with the half-hourly meter data to confirm the round-the-clock baseload and sizes for the very high self-consumption a cold store delivers. It includes a roof and structural check, with a wind-load assessment to BS EN 1991-1-4, and pays particular attention to insulated-panel roof construction so fixings protect the thermal envelope and the building's watertightness.

The G99 grid application is normally submitted early so the DNO clock runs in parallel with design, and the design is coordinated with any F-gas-driven heat-pump retrofit so the PV supports the electrified plant rather than clashing with it. Insurer pre-design sign-off and confirmed sprinkler clearances should be in place before fabrication. The build can happen above live operations with the only outage being the short final grid synchronisation, so the cold chain itself need not be interrupted, which matters when product temperature integrity is non-negotiable. When comparing proposals, ask what accreditations and insurance the installer holds and ask to see the evidence (MCS covers systems up to 50 kW, which is below the scale of most cold-store arrays), and ask how the workmanship is warranted.

An illustrative example

As an illustrative composite (not a real project) built from the site's modelling assumptions: a family-owned cold storage operator running a 24/7 facility with an energy spend in the region of £390,000 a year per site might install around 782 kW of roughly 1,440 panels, which would be expected to generate about 725,000 kWh a year. Funded through a cash and asset finance hybrid, the model assumes self-consumption near 92% on the constant refrigeration load, the annual saving would be expected to sit around £187,000 for a payback close to 4.3 years in the simple model, and the system could feature in a major customer's sustainability reporting. The figures are illustrative and depend on your refrigeration load, tariff, roof and funding route.

If your cold chain spans dedicated chilled handling and broader logistics, see distribution centre solar and fulfilment centre solar. When you are ready, review the cost guide and funding routes, then send an enquiry, or read the cold storage solar FAQs first.