Grants and funding for solar panels for warehousing
UK grants, tax reliefs, and finance routes for solar panels for warehousing. Updated for 2026.
There is no single "warehouse solar grant" in the UK, and that is fine - the economics stand up on the energy saving alone. What does the heavy lifting is the tax treatment, plus a handful of live incentives that stack on top. Because this is a decision your finance director will scrutinise, it is worth being precise about what applies in 2026 - and about a couple of things that are widely, and wrongly, repeated.
The main lever: capital allowances
Solar PV bought by a UK company is special-rate plant and machinery. The practical route for almost every warehouse project is the Annual Investment Allowance (AIA): 100% first-year relief on up to £1m of qualifying spend, and it covers solar. For a profitable company that means most systems are written off against taxable profit in year one, worth roughly a quarter of the capex back. Spend above £1m attracts the 50% First-Year Allowance for special-rate assets, with the balance going to the 6% special-rate pool.
The myth to avoid: 100% "full expensing" does not apply to solar. Full expensing is for main-rate plant only; solar is special-rate, so it gets the 50% FYA, not full expensing. Any installer telling you a warehouse array is "fully expensed under full expensing" has it wrong - the correct 100% route is the AIA. Likewise, there is no 0% VAT on commercial solar - that rate is domestic-only. A warehouse system is standard-rated 20% VAT, which a VAT-registered business reclaims.
Incentives that stack on top
- Business-rates exemption. On-site solar and co-located battery storage are exempt from business rates in England from April 2023 to 31 March 2035 - so adding generation does not add to your rateable value.
- Smart Export Guarantee (SEG). Surplus you export is paid for by your supplier under the SEG (systems up to 5 MW, MCS-certified). Rates are supplier-set and negotiable at commercial scale; for a genuine daytime warehouse operation export is small, but for shift-only or low-base-load sites it is a meaningful contribution.
- Freeport & Investment Zone Enhanced Capital Allowances. If your unit sits inside a designated Freeport or Investment Zone special tax site, new plant can attract 100% Enhanced Capital Allowances - available for English Freeport tax sites to 30 September 2031, and Scottish/Welsh and Investment Zone sites to 30 September 2034. It applies only within the specific designated sub-areas (not the whole freeport) and only to new equipment.
Note: the Industrial Energy Transformation Fund (IETF) is closed to new applicants in 2026, so we do not count on it for warehouse projects.
Funding the capex: cash, finance or PPA
How you pay is as important as the reliefs. Cash purchase captures the full AIA and every kWh of saving. Asset finance spreads the cost over 5-7 years and is usually cash-flow positive from month one. A Power Purchase Agreement (PPA) needs no capex at all - a funder owns the system and you buy the daytime power below grid price, which suits tenants and 3PL operators on shorter leases. We model all three side by side, with the IRR for each, on every quote. For leased warehouses, the funding route and a green-lease addendum usually matter more than any grant.
Funding routes for this sector
Annual Investment Allowance (AIA) + 50% First-Year Allowance
UK companies within corporation tax. Solar PV is special-rate-pool plant and machinery. The £1m Annual Investment Allowance gives 100% first-year relief and covers solar, so most warehouse installs are fully written off in year one. Spend above £1m gets the 50% First-Year Allowance, with the balance to the 6% special-rate pool.
- Value
- Up to roughly 25% of the capex back as a year-one tax saving for a profitable company.
Important: full expensing does NOT apply to solar (it is main-rate only, and solar is special rate). AIA is the 100% route for most warehouse projects. Commercial solar is standard-rated 20% VAT, reclaimable by a VAT-registered business, the 0% VAT rate is domestic-only and does not apply to warehouses.
Smart Export Guarantee (SEG)
MCS-certified installations up to 5 MW exporting surplus to the grid. Rates are set by suppliers (must be above zero), not fixed by Ofgem.
- Value
- Typically a few pence to ~15p/kWh on flat commercial tariffs; the best time-of-use tariffs can pay more. Rates vary by supplier and are negotiable at commercial scale.
For genuine daytime operations, export is minimal and self-consumption dominates. For low-base-load or shift-only sites (e.g. self-storage, single-shift ambient), a competitive SEG tariff is a meaningful part of the economics.
Business Rates Exemption for on-site renewables
On-site renewable generation (rooftop solar) and co-located battery storage plant is exempt from business rates in England.
- Value
- 100% business-rates exemption on the qualifying solar and storage plant.
In force from 1 April 2023 to 31 March 2035 in England. Removes a running-cost objection to installing solar on a rated commercial building.
Freeport & Investment Zone Enhanced Capital Allowances (ECAs)
Companies using new, unused plant and machinery primarily within a designated Freeport or Investment Zone SPECIAL TAX SITE can claim 100% first-year Enhanced Capital Allowances.
- Value
- Effective 100% first-year tax relief on qualifying capex.
Available for English Freeport tax sites to 30 September 2031, and Scottish/Welsh Freeport and Investment Zone sites to 30 September 2034. It applies only inside the specific designated sub-areas (not the whole freeport) and only to new plant, always confirm your unit is within a designated tax site. Designated Freeports include Felixstowe & Harwich, Humber, Liverpool, Teesside, Thames, Solent, East Midlands and Plymouth.
Power Purchase Agreement (PPA) / zero-capital funding
A third-party funder installs, owns and maintains the system; you buy the power it generates at a fixed rate below grid, with no upfront capex.
- Value
- Not a grant, but removes the capex barrier entirely and suits tenants and shorter lease/contract tenure.
Often the right structure for 3PL operators and leased big-box units. Paired with a BBP-aligned green-lease addendum, it lets a tenant put solar on a leased roof with the landlord's cooperation and clear end-of-lease treatment.
Funding and tax questions
Can we install solar on a warehouse we lease rather than own?
Yes. Tenant solar is now standard practice, it needs landlord consent, and most institutional landlords work to a standard green-lease addendum. We provide the template aligned with the BBP Green Lease Toolkit and engage the landlord for you. If your lease or contract is short, a Power Purchase Agreement puts a funder on the roof instead, so you get cheaper daytime power with no capex and clean end-of-lease treatment.
Are there grants or tax reliefs for warehouse solar?
The main lever is the £1m Annual Investment Allowance, which lets a profitable company deduct the whole capex from taxable profit in year one (note: full expensing does not apply to solar, and there is no 0% VAT for commercial, that's domestic-only; commercial VAT is 20% and reclaimable). On top of that: on-site solar and storage are exempt from business rates in England to 2035, the Smart Export Guarantee pays for surplus export, and units inside a designated Freeport or Investment Zone tax site can claim 100% Enhanced Capital Allowances on new plant. The old Industrial Energy Transformation Fund is closed to new applicants.
What is a Freeport Enhanced Capital Allowance and does our site qualify?
If your unit sits within a designated Freeport or Investment Zone special tax site, and you buy new, unused plant to use primarily there, you can claim 100% first-year Enhanced Capital Allowances. It applies only inside the specific designated sub-areas (not the whole freeport) and only to new equipment. English Freeport tax sites run to 30 September 2031, Scottish/Welsh and Investment Zone sites to 30 September 2034. We check eligibility for every applicable site.
Should we own the system or use a PPA?
Owning it (cash or asset finance) means you claim the tax allowances and keep every kWh of saving, best for owner-occupiers and longer tenures. A PPA needs no capex: a funder owns and maintains the system and you buy the power at a fixed rate below grid, off balance sheet, which suits tenants and 3PL operators on shorter contracts. We model cash, asset finance and PPA side by side with the numbers for each.
Can you install without shutting down our operation?
Yes. Roof installation happens above your operations, picking, put-away and despatch continue as normal. The only operational impact is the final grid connection (typically a few hours), which we schedule for a weekend or planned shutdown. We've delivered installs through peak season with no disruption to the floor.
What's the payback for a 3PL or short-lease operator specifically?
On a self-funded basis, a well-sized warehouse array pays back in roughly 3-6 years depending on how much of the generation you self-consume. But for 3PL and contract-logistics operators we more often structure a PPA or operating lease so the deal is cash-positive from day one with no capex, and written to fit your customer-contract term rather than a 25-year horizon.
Sources and official guidance
Figures on this page are based on the following primary sources and are correct to the best of our knowledge as of July 2026. This is general information, not tax, legal or financial advice.