Are commercial solar panels worth it in the UK?
The short answer: for the vast majority of UK businesses in 2026, yes. Here's the honest analysis — where solar is a no-brainer, where it isn't, and the four questions that decide it.
Key takeaways
- Commercial solar installations in the UK typically deliver full financial payback within four to six years at current grid tariffs.
- HMRC full expensing allows UK companies to deduct 100% of solar installation costs from taxable profits in year one.
- Onsite generation locks in electricity costs below 8p per kWh for 25 years, shielding businesses from energy market volatility.
Four questions that decide if solar is worth it for you
You use most of your electricity 8am–5pm
Self-consumption above 70% is where payback drops below 7 years. Warehouses, factories, cold stores, offices and retail all qualify.
Your unit rate is 22p/kWh or higher
Every 1p on the grid rate takes ~6 months off payback. Fixed contracts under 20p delay the case; anything over 25p accelerates it.
Your roof has 10+ years of remaining life
Solar frames last 30–40 years. If the roof needs replacing sooner, do both together — combined access saves ~£12–£18k on 200 kWp.
You have the balance sheet to claim allowances
Full Expensing gives a 25% corporation-tax rebate in year one. If you're loss-making, a PPA still delivers day-one savings without capex.
The 2026 headline numbers
A 200 kWp rooftop system in the Midlands generates ~180,000 kWh/yr. At 28p/kWh grid and 80% self-consumption that's roughly £45,000/yr saved against a £200k installed cost — a 5–6 year payback and a 30-year asset. Add Full Expensing and year-one net cost drops another 25%.
FAQ
Are commercial solar panels really worth it in 2026?
For UK businesses paying 24–35p/kWh with steady daytime demand, yes — typical payback is 5–8 years on a 30-year asset. IRRs of 12–18% are normal, well ahead of most corporate-bond yields.
What's the average payback for commercial solar in the UK?
5–8 years for well-designed rooftop systems in 2026. Sites with high self-consumption (cold stores, factories on 24/5 shifts) hit 4–5 years; office blocks with lower weekend load run 7–9.
What could make it not worth it?
Very low grid rates locked in on long fixed contracts, a roof needing replacement in under 5 years, or DNO connection costs that turn a rooftop project into a £150k grid-upgrade project. All three are diagnosable on a proper feasibility.
Is a PPA better than buying?
PPA wins when you don't want capex, can't use tax allowances, or want a hands-off asset. Buying wins on total lifetime savings (usually 40–60% more) and full control.
How much do commercial solar panels cost in the UK?
£900–£1,200 per kWp installed at 50–500 kWp scale in 2026. Larger sites (1 MW+) drop toward £750/kWp. See our full cost guide for the breakdown.
Get an independent view on your site
Read next
Related guides & sector pages
Benefits of commercial solar panels
Why UK businesses invest in rooftop solar.
Read GuideHow solar cuts business energy bills
Self-consumption, hedging and export.
Read GuideBusiness rates & solar panels
The 2023 exemption and what it means for you.
Read SectorWarehouses & logistics
Large-roof solar for 3PLs and distribution hubs.
ReadRequest your free feasibility review
Share a few details and our team will send a no-obligation review of your site — indicative system size, annual generation, savings and payback. Prefer to explore numbers yourself first? Run the calculator or contact us directly.
- MCS & RECC accredited installer
- Response within one working day
- No cost, no obligation