How to fund distribution centre solar: buy, lease or PPA

Funding solar panels for distribution centres in 2026

Funding is usually the step that decides whether solar panels for distribution centres get built this year or sit on a slide for another budget cycle. The position in 2026 is workable: there is no single headline grant for large rooftop arrays, but capital allowances, export income, tax-site relief where it applies and modern green-lease structures give almost every distribution centre a route, whether the operator owns the building or leases it. This guide walks through each route in turn and how they stack for a big-box hub or a whole distribution estate. Every figure here is illustrative and subject to current legislation.

The starting point for an estate owner is that distribution centres rarely qualify for the kind of sector grant aimed at heavy manufacturing, but they do not need to. The economics of solar panels for distribution centres are carried by tax relief and avoided grid cost, with grants playing, at most, a supporting role. Getting the funding stack right is mostly about matching the relief to your ownership position and to where your hubs physically sit on the map.

Capital allowances at distribution-centre scale

For most distribution centre operators, capital allowances are the largest single piece of funding, even though they are a tax relief rather than a cash grant. Solar PV is plant and machinery, and it is normally treated as special-rate plant. The Annual Investment Allowance (AIA) lets a company deduct 100% of qualifying spend up to £1m a year against profit, a limit shared with its other plant spend and with associated companies. Spend above the limit attracts a 50% first-year allowance, and the rest is written down at the special rate. Full expensing, the 100% first-year allowance for main-rate plant, does not cover special-rate assets such as solar.

A worked example: a £1.5m scheme gets £1m under the AIA plus a 50% first-year allowance on the other £500,000, so £1.25m is deducted in year one and £250,000 goes into the special-rate pool. At the 25% main rate of corporation tax the year-one deduction is worth about £312,500, if the company has the profit and has not used the AIA elsewhere. It is an illustration, not tax advice. The official capital allowances guidance sets out the current rules and limits. Where an estate is fitting solar across several hubs in one year, the AIA limit is shared across the business and its associated companies rather than applied per building, so phasing can matter.

Freeport and Investment Zone tax sites

Location can unlock a second layer of relief. A designated Freeport or Investment Zone tax site can carry a 100% first-year allowance for companies on new, unused plant and machinery used primarily in the site, which includes rooftop solar. HMRC's manual sets the end date for qualifying spend at 30 September 2031 for English Freeport tax sites and 30 September 2034 for Scottish and Welsh Freeport sites and Investment Zone sites.

A distribution centre in a Freeport city is not automatically inside a tax site: only the designated tax-site boundary counts, and the relief covers plant, not buildings. Check the boundary and the conditions in the HMRC capital allowances manual (CA23122) before finalising the funding structure.

Export income through the Smart Export Guarantee

The Smart Export Guarantee (SEG) requires suppliers in the scheme to pay for surplus electricity exported from small-scale low-carbon generation up to 5 MW. Each supplier sets its own tariff, which must be above zero, so quote a rate only with the supplier's name and the date. Accreditation and metering requirements depend on system size, so check the supplier's terms and Ofgem's SEG guidance. For a 24-hour distribution centre with heavy MHE charging and refrigeration load, export tends to be minor, because the array is sized to be consumed on site, so SEG is a useful top-up rather than a main pillar. For a hub that runs a single daytime shift and generates a meaningful surplus at the weekend, SEG income becomes more material and is worth modelling with a named tariff.

Funds that have closed

The Industrial Energy Transformation Fund closed in July 2025 and no successor fund is planned; its last application window shut on 19 April 2024. Solar PV was never an eligible technology, so a distribution-centre roof should not be costed against it. The gov.uk guidance records the closed scheme.

Green leases: funding for tenant-occupied distribution centres

A large share of UK distribution centre floorspace is leased, often from institutional landlords, which historically made solar awkward for the tenant who pays the energy bill. That has changed. Tenant-installed solar needs the landlord's consent, and the green-lease addendum is the usual mechanism: it can give the tenant the right to install and operate an array while setting out clear end-of-lease treatment. The Better Buildings Partnership publishes a Green Lease Toolkit that landlord and tenant can use as a starting text.

For tenants who prefer to avoid capex entirely, a Power Purchase Agreement (PPA) layers neatly on top: a third party funds and owns the array, takes the lease risk, and the operator simply buys the on-site generation per kWh below grid retail. This is frequently the right answer for distribution centre operators on shorter leases, while ownership and the capital allowances that apply suit owner-occupiers and long-FRI tenants. A multi-site estate often runs both models in parallel across its hubs.

Putting the stack together

In practice, funding solar panels for distribution centres is rarely one route. A typical owner-occupier hub combines capital allowances with modest SEG income and, where the site sits inside a designated tax site, Freeport relief on top. A typical leased hub combines a green-lease addendum with either tenant ownership or a PPA. The right combination depends on ownership, lease length, location and whether the operating company is paying tax.

The practical next step is to size the array against your real load so the funding can be matched to a firm number. Our savings calculator gives a quick estimate, the cost guide breaks down the underlying pricing, and a free quote built from your half-hourly meter data confirms both the system size and the funding route best suited to each distribution centre in your estate.