Industrial Solar Panels in the UK
Factories, warehouses and industrial units are the best solar sites in the UK: huge unshaded roofs, heavy daytime electricity use, and commercial power rates of 25-30p/kWh that make every generated kWh worth two to three times the export rate. This guide covers what industrial solar panels cost by system size, what your roof needs to support, how the G99 grid connection works, and the finance routes from outright purchase to PPA.
Quick Answer
Industrial solar panels cost £550-£850 per kWp installed in the UK. A 100kW factory rooftop costs £60,000-£85,000, generates around 95,000 kWh a year and pays back in 3-5 years at industrial electricity rates. The Annual Investment Allowance deducts 100% of the cost from year-one taxable profits, and most industrial rooftop installs fall under permitted development.
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How much do industrial solar panels cost?
Industrial solar is the cheapest solar per kWp in the UK. Fixed costs (design, scaffolding or access equipment, the G99 application, commissioning) spread across hundreds of panels, and trapezoidal metal roofs, the most common industrial roof type, are the fastest surface to mount on.
| System Size | Typical Site | Installed Cost (est.) | Cost per kWp | Annual Generation |
|---|---|---|---|---|
| 100 kWp | Mid-size factory or unit | £60,000-£85,000 | £600-£850 | ~95,000 kWh |
| 200 kWp | Large factory, cold storage | £110,000-£153,000 | £550-£765 | ~190,000 kWh |
| 500 kWp | Industrial estate, distribution hub | £255,000-£340,000 | £510-£680 | ~475,000 kWh |
Estimates based on UK market rates in 2026, excluding VAT. Generation assumes an average UK yield of 950 kWh per kWp. Above 500 kWp, cost per kWp continues to fall towards utility-scale pricing.
For a size-by-size breakdown from 10 kWp upwards, including what a quote should itemise, see our commercial solar costs guide and the dedicated 100kW solar system cost guide.
Industrial solar ROI: why factories pay back fastest
Industrial sites have the load profile solar wants: machinery, compressors, refrigeration and HVAC running through daylight hours. Self-consumption of 70-90% is common, and at industrial rates of 25-30p/kWh every kWp installed saves roughly £190-£280 a year. That is a 3-5 year simple payback, and faster once tax relief is applied.
The tax treatment does a lot of work here: the Annual Investment Allowance deducts 100% of the installation from taxable profits in year one, worth 25% of the project cost at the main corporation tax rate, and there is no business rates uplift on the panels in England until at least 2035. Surplus generation earns export income through the Smart Export Guarantee, though at industrial scale most value comes from displacing imported power.
Sites with evening or 24-hour shifts should model commercial battery storage alongside the array: it shifts daytime surplus into evening production hours and can cut peak-rate charges.
Roof requirements and grid connection
Structural survey first
An industrial array adds 12-20 kg/m² plus wind loading. Many older industrial buildings, particularly those with asbestos cement or fibre cement roofs, need strengthening or roof replacement before panels can go on. Budget £500-£2,000 for a structural engineer's assessment and make it the first step, not an afterthought.
Roof type sets the price
Trapezoidal metal roofs are the cheapest to fit, clamps fix straight to the ribs. Flat roofs need ballasted frames, which add £50-£100 per kWp. Fragile roofs need walkways and access equipment that push labour costs up.
G99 approval and export limits
Every industrial system needs G99 approval from your DNO, and at 100kW+ that means a connection study, typically 8-12 weeks. In congested areas the DNO may cap export or ask for a contribution to network reinforcement. Make approval a contract milestone before committing to the full project.
Metering and supply contracts
Industrial sites are usually on half-hourly metering, and some suppliers reprice supply contracts when on-site generation is added. Check the supply contract implications as part of the business case, not after commissioning.
Paying for industrial solar
Outright purchase returns most over the system's life because you keep the tax relief, the export income and the whole saving. Where capital is constrained, asset finance and lease-purchase deliver positive cashflow from month one, and Power Purchase Agreements put the system on your roof with no capital outlay at all, in exchange for most of the long-term value. Grants are rare at industrial scale, but our commercial solar grants guide covers the schemes that do exist, including 25% farm grants and interest-free Scottish SME loans.
Industrial solar by building type
- Solar panels for manufacturing and factories : 100kW-1MW+, the best self-consumption ratios of any sector
- Solar panels for warehouses and logistics : vast flat roofs, 50kW-1MW+
- Solar panels for farms : barn and shed rooftops with grant support
- Ground-mounted solar : for sites with land but limited roof
Industrial solar panels FAQ
How much do industrial solar panels cost in the UK?
Industrial solar costs £550-£850 per kWp installed, falling as systems get bigger. A 100kW rooftop system costs £60,000-£85,000, a 200kW system £110,000-£153,000, and a 500kW system £255,000-£340,000. The Annual Investment Allowance lets businesses deduct 100% of the cost from taxable profits in year one, and VAT-registered businesses reclaim the 20% VAT.
What is the difference between industrial and commercial solar panels?
The panels themselves are the same technology. Industrial solar refers to the scale and setting: systems of roughly 100kW to 1MW+ on factories, warehouses and industrial units, usually on trapezoidal metal or flat roofs, with three-phase connections and G99 grid approval. Commercial solar covers the wider range from small shop rooftops upwards.
How much roof space does an industrial solar system need?
Roughly 5-6 m² per kWp using modern 500W+ modules, so a 100kW array needs around 550 m² of clear roof and a 500kW array needs around 2,750 m². Skylights, plant, access walkways and shading reduce the usable area, which is why a site survey is the first step of any industrial project.
Do industrial solar panels need planning permission?
Most rooftop solar on industrial premises falls under permitted development. Ground-mounted arrays, systems on listed buildings, or arrays larger than 1MW may require full planning. Every industrial system needs G99 grid approval from the DNO, which at 100kW+ involves a connection study and can take 8-12 weeks.
What is the payback on industrial solar?
Typically 3-5 years for sites with high daytime electricity use, because industrial rates of 25-30p/kWh mean every kWp saves roughly £190-£280 a year when generation is used on site. After tax relief through the Annual Investment Allowance, effective payback can be under 4 years, with 25-30 years of generation after that.
Can industrial solar be installed without capital outlay?
Yes. Asset finance, lease-purchase and Power Purchase Agreements (PPAs) are all widely available at industrial scale. A PPA funder installs and owns the system and sells you the power at below-grid rates, but keeps the capital allowances and most of the saving, so outright purchase usually returns more for businesses that can deploy capital.
Related guides
- Commercial solar panels UK: the complete guide
- Commercial solar panel costs by system size
- 100kW solar system cost UK
- How to find a commercial solar installer
- Capital allowances and tax benefits on commercial solar
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He researches every battery and inverter brand against manufacturer datasheets, MCS and Ofgem data, and feedback from the MCS-certified installers in our directory before publishing.
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