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.
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.
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