Warehouse & Logistics

Warehouses have the one thing that makes commercial solar work best: acres of large, flat, unshaded roof. That is why logistics and distribution sites are among the most-financed solar projects in the country, and why systems here are large, commonly 150 to 750 kW, with project values between £110,000 and £600,000. The funding question is how to turn that roof into cheaper power without locking up capital the operation needs elsewhere, and it comes with a wrinkle unique to the sector: many warehouses are leased or run at lower on-site electricity demand than their roof could generate.

Why the routes land differently for a logistics operator

The self-consumption question is sharper for warehouses than for most sectors. A cold store or an automated fulfilment centre with heavy MHE charging, conveyors and refrigeration has strong daytime load and high self-consumption, so ownership routes pay back fast. A conventional storage warehouse with modest on-site demand may export a larger share, and because a unit used on site (displacing 26 to 32p of import) is worth more than double an exported unit (12 to 16p), the funding route that suits you depends heavily on how much of the generation you will actually use. A well-matched warehouse system commonly shows a simple payback of around four to seven years before tax relief.

The tenure question also shapes the decision. If you own the building and will hold it long term, ownership routes make the most sense; if you lease, a PPA or a shorter finance term may fit the occupancy better. The main routes:

• Buy outright keeps the maximum lifetime return and full first-year relief, best where the operator owns the site and has capital to spare.
• Hire purchase gives ownership at the end plus full year-one relief now, paid from the energy saving, a strong fit for an owner-occupier warehouse.
• Asset finance secures the borrowing against the solar plant, keeping fleet finance and other facilities free, which matters for logistics operators with rolling vehicle finance.
• A business or green loan buys the system outright so you own it from day one and repay separately.
• A Power Purchase Agreement needs zero capital and suits leased or lower-demand sites where the operator wants cheaper power without owning the asset, accepting that the funder keeps the relief and export income.

For a big roof with uncertain self-consumption, modelling is essential. The finance calculator shows the monthly finance or PPA cost against the projected saving for your actual load, and the finance options comparison lines the routes up on ownership, balance sheet and tax.

The grants and reliefs that actually apply to warehousing

There is no dedicated national grant for warehouse solar, the value is in tax relief and export income, and the numbers are large because the systems are.

• Annual Investment Allowance gives 100% first-year relief on qualifying plant up to £1m a year. Many single-warehouse installs sit under that cap and can be relieved in full in year one; at 25% corporation tax that returns about 25p per £1 spent up front.
• The 50% special-rate first-year allowance matters for the larger portfolio or big-box projects whose spend exceeds the £1m AIA ceiling. Remember the honest correction: solar is special-rate plant, so it gets 50% in year one, not 100% “full expensing”, and the new 40% first-year allowance from January 2026 is for main-rate assets only.
• Business rates exemption is particularly relevant here, because business rates are a material cost for large-footprint buildings. Qualifying rooftop solar for self-consumption is 100% exempt from business rates in England to March 2035, so a big array will not add to your rateable value in that window (Scotland and Wales differ).
• VAT at 20% on the install is reclaimable for a VAT-registered operator, a cash-flow timing item rather than a real cost.
• The Smart Export Guarantee is unusually important for warehouses, because a large roof on a lower-demand site can export a meaningful surplus. SEG pays per unit for exported power on systems up to 5 MW; the income is taxable trading income. It softens, but does not replace, the case for using as much of your own generation as possible.

To confirm which schemes genuinely apply to your site rather than the public-sector or domestic ones that do not, run the funding finder.

What this means for a logistics operator’s decision

If you own the warehouse, will hold it long term and have strong daytime demand, buying outright or via a green loan returns the most and captures the full relief. If you want to preserve capital for the operation, hire purchase or asset finance let you own the system and claim the year-one allowance while repaying from savings. Where the building is leased, or on-site demand is low relative to the roof, a PPA delivers cheaper power with no capital and no maintenance risk, and lets the funder carry the asset, accepting a lower lifetime return.

Because warehouse self-consumption varies so widely, the single most useful step is to model the routes against your real load before committing. Do that, confirm the tax position with your accountant, and request costed quotes once the case is clear for your site.