Commercial Solar ROI in the UK: What Businesses Need to Know in 2026

Last updated: 25 March 2026. ROI figures in this article are indicative estimates based on Q1 2026 market data and UK energy prices. Contact KLY Solar for current structural frame kit pricing.

Keith Lin is the Director of KLY Solar (KLY Global Ltd), a UK supplier of solar carport structure kits for commercial project teams.

But what kind of return on investment (ROI) can UK businesses realistically expect from solar in 2026? In this guide, we break down the numbers, tax incentives, and factors that affect your payback period.

Any excess energy your system generates can be exported to the grid via the Smart Export Guarantee. While SEG tariffs (typically 3–6p/kWh) are modest compared to avoided grid costs (25–35p/kWh), they provide an additional revenue stream that improves your overall return.

A Real-World Example

Consider a 10,000 sq ft warehouse in central Scotland installing a 100kWp solar carport system:

System cost (installed): approximately £80,000–£100,000

Annual generation: approximately 85,000 kWh

Annual savings at 30p/kWh: approximately £25,500

Payback period: 3.5–4.5 years (with AIA tax relief)

25-year net benefit: £500,000+ in avoided electricity costs

CO2 reduction: approximately 18 tonnes per year

These figures assume 80% self-consumption and current grid electricity rates. Actual results vary based on site-specific factors, but they illustrate the scale of opportunity for commercial solar in the UK.

How KLY Solar Can Help

KLY Solar supplies made-to-order solar carport frame kits to UK EPCs and installers, for commercial projects across the UK. We supply the structural steelwork, design freeze documentation, and QC evidence packs. Installation, foundations, and electrical scope are handled by your own EPC contractor.

Contact us today to request a supply-only quotation for your solar carport project.

Sources and further reading

Solar Energy UK — solarenergyuk.org

HMRC Capital Allowances Guidance — gov.uk/capital-allowances

Ofgem Smart Export Guarantee — ofgem.gov.uk

Last reviewed: March 2026