Commercial solar panel grants — every active UK route in one table.

What a commercial solar panel grant is worth — worked example

The intent behind “are there grants for commercial solar panels” is really is it worth it. Here is a single costed example for a 100kWp rooftop system at indicative 2026 pricing, showing payback before and after the funding stack. Figures are indicative UK ranges, not a quote.

Indicative 2026 figures. Effective net capex assumes the Annual Investment Allowance (~25% effective tax saving); a rural business adding REPF (ended March 2026) would see net capex and payback fall further. Export income via SEG is included in the annual figure and is additional recurring revenue. Self-consumption ratio drives the saving — sites with strong daytime load pay back fastest.

How much do commercial solar panel grants cover?

Coverage has two layers: the cash grant (25-40% of capex where you qualify) and the UK-wide tax stack (AIA, roughly 40% combined) that applies on top. The table below shows indicative installed cost by system size, the effective net cost after the tax stack alone, and typical payback after support. Add a cash grant on top and both the net cost and payback fall further.

Indicative 2026 UK turnkey ranges (£540-£1,100/kWp; the common 250-500kWp band sits around £660-£760/kWp). Effective net cost assumes AIA (~60% of headline). A REPF, Local Growth Fund or devolved-nation grant would reduce net cost and payback further. Confirm against a costed quote.

Commercial solar SEG export rates compared (2026)

The Smart Export Guarantee (SEG) is the closest thing to an ongoing “grant” — suppliers with 150,000+ customers must pay above 0p for surplus you export, provided the system is MCS-certified, under 5MW and has half-hourly export metering. Rates vary widely, and several top payers lock you into their import supply. Octopus cut Outgoing Fixed from 15p to 12p with effect from 1 March 2026, so its flat rate now sits level with EDF Export 12M Small Business and Scottish Power SmartGen Premium at around 12p — and the strongest overall returns come from dynamic tariffs (Octopus Agile and Flux, peaks around 30p) where battery storage can shift export into the peak windows. Last verified July 2026.

Indicative rates, verified July 2026, for comparison; confirm current figures with each supplier before signing. See our full SEG comparison and the EDF SEG page for the open-rate options.

Commercial solar grants by UK nation

Funding differs sharply by nation. The AIA and the SEG apply UK-wide; everything else is devolved. The table summarises the headline route(s) per nation — follow the link for the full breakdown.

Do you qualify? Eligibility by sector and geography

Installer pages leave this vague with “grants may be available”. Here is the explicit qualifier: find your business type, see the primary route, the realistic coverage, and the evidence a funder will expect.

How to apply for a commercial solar grant (step by step)

Writing the application is what we actually do as an independent funding desk, so this is the most granular part of the page. Competitive grants (REPF, Local Growth Fund, Salix) take roughly 16-22 weeks kickoff to decision; tax allowances and SEG sign-up are immediate.

1. Check eligibility — confirm which routes you can credibly use by sector, geography and ownership (use the qualifier table above).
2. Review the open funding routes — shortlist the live schemes plus the UK-wide AIA stack, and rule out the closed ones (IETF Phase 3, PSDS Phase 4, UKSPF).
3. Get MCS quotes and system sizing — obtain MCS-certified quotes with indicative capex and payback so the application carries credible numbers on a system under 5MW.
4. Write and submit the application — prepare the funder-specific case (energy baseline, business case, evidence pack) and submit before the window closes.
5. Funder review — allow 8-12 weeks of assessment for competitive grants.
6. Drawdown and install — on approval, draw down under the grant agreement, install, then claim AIA on the net cost.

Which grants can you combine? (UK Subsidy Control Act 2022)

The Subsidy Control Act 2022 generally prohibits stacking two government cash grants on the same plant, but tax allowances and recurring revenue always layer on top. The do/don’t table:

How to combine grants for maximum benefit

The right answer is normally a stack — multiple routes layered to compound the saving. The UK Subsidy Control Act 2022 prohibits double-grant funding for the same plant, but tax allowances and recurring revenue routes always layer on top.

Tax-only stack — for any UK incorporated business

Annual Investment Allowance (100% of the first £1m of capex in year one — 25% back via corporation tax) (~17% on VAT-inclusive cost) + SEG (export revenue 5-40p/kWh). No application required. Works for every UK incorporated commercial solar project. Effective subsidy: ~40% of capex equivalent. Because solar panels are special-rate expenditure, AIA is the mechanism that delivers the 100% year-one write-off — The Annual Investment Allowance covers main-rate plant and does not apply to solar. Capex above the £1m AIA cap attracts the 50% special-rate first-year allowance, with the balance in the special rate pool at a 6% writing-down allowance.

Tax + grant stack — where eligible

AIA + SEG + REPF (rural) OR Local Growth Fund (Mayoral Authority area) OR Salix BAU loan (public sector). Effective subsidy: 50-65% of capex equivalent.

Zero-capex stack — PPA + tax routing

Power Purchase Agreement structure where a third-party investor pays for and owns the asset. The investor claims the capital allowances on the asset (AIA, or the 50% special-rate first-year allowance above the cap). You buy electricity at a fixed pence/kWh, typically 6-9p below grid prices. Effective subsidy embedded in the PPA tariff.

Sector-specific grant pages

Each sector has different funding access — see the dedicated pages:

• Solar grants for manufacturers — IETF and SIETF both closed; AIA and the 50% special-rate first-year allowance.
• Solar grants for farms — REPF still active
• Solar grants for schools — PSDS closed; Salix BAU loans + LCSF
• Solar grants for NHS trusts — PSDS closed; Salix loans + PPAs
• Solar grants for hotels — AIA + PPA dominant
• Solar grants for warehouses — PPA + AIA
• Solar grants for retail — AIA + PPA + canopies
• Solar grants for offices — BREEAM credit value driver

Individual grant route pages

For deeper detail on each active route:

• Capital allowances on solar — AIA vs Full Expensing — why solar is special-rate expenditure and AIA is the 100% year-one route
• Smart Export Guarantee — recurring revenue for surplus exports
• SEG tariffs compared — supplier-by-supplier analysis
• Power Purchase Agreements — zero-capex commercial solar
• Salix funding — public sector loans and LCSF
• Local Growth Fund — UKSPF successor for Mayoral Authority areas
• Full grants and funding hub — all schemes in one place

What we do for clients

The free funding review takes 4 minutes. We reply by email with a written shortlist of routes you would credibly use, indicative system sizing, and ballpark capex with payback after support. Engagement fees only kick in if you ask us to write the application — we never charge for the initial scoping.