UK commercial solar at a glance
The UK now has approximately 19.9 GWp of installed solar PV capacity across all segments (residential, commercial, ground-mount/utility). Commercial rooftop and ground-mount installations together account for the majority of new annual installations, with residential adoption flattening as commercial growth accelerates.
Commercial sector drivers in 2026:
- Electricity prices structurally higher than pre-2021 levels, making PPA economics attractive at lower irradiance levels than historically required
- Customer-driven ESG pressure in supply chains (retailers requiring supplier Net Zero commitments)
- Investor and finance pressure through TCFD/CSRD/SBTi frameworks
- Falling installation costs driven by manufacturing scale and supply chain maturity
- Improved grid connection processes, DNO G99 application turnaround has shortened in most regions
Sector breakdown of commercial PV adoption
Based on aggregate observations across the UK commercial property base, here's the rough breakdown of where commercial solar PV is being deployed:
| Sector | Share of new commercial PV (estimated) | Typical system size |
|---|---|---|
| Manufacturing & industrial | ~32% | 500kWp - 3MWp |
| Logistics & warehousing | ~24% | 1MWp - 5MWp |
| Public sector (NHS, councils, education) | ~14% | 200kWp - 2MWp |
| Food & beverage processing | ~10% | 500kWp - 2MWp |
| Retail & supermarkets | ~8% | 200kWp - 1MWp |
| Agriculture & rural enterprise | ~7% | 100kWp - 1MWp (rooftop), 1-50MWp (ground) |
| Hospitality, leisure, offices | ~5% | 100kWp - 500kWp |
Regional opportunity distribution
UK commercial PV opportunity isn't evenly distributed. Three factors drive regional variation:
- Concentration of industrial property, Midlands, Yorkshire, North West, and Scotland's central belt have the highest density of large commercial rooftops
- Grid capacity, DNO headroom varies significantly. Northern Powergrid, SP Energy Networks, and parts of UK Power Networks region have meaningful constraints in some areas
- Solar resource, modest gradient from north to south, but irradiance differences are smaller than commonly assumed
Annual solar irradiance across the UK varies from approximately 800 kWh/kWp in northern Scotland to 1,050 kWh/kWp on the South Coast. The difference is real but rarely decisive for PPA economics, what matters more is roof orientation, building occupancy, and electricity tariff.
Commercial site characteristics that drive PV success
Based on aggregate analysis of suitable sites across the UK commercial property base:
- Roof area: minimum ~500 m² for economic PPA viability, ideally 2,000+ m² for institutional funder interest
- Roof orientation: south-facing optimal but east-west still works (production curve shifts towards morning/evening rather than midday peak)
- Building age: roofs under 20 years old preferred; older roofs need surveys and sometimes refurbishment scheduling
- Daytime electricity consumption: production sites, offices, warehouses with 9-5 operations achieve highest self-consumption ratios
- Grid connection: existing three-phase supply and DNO headroom essential for systems above 100kWp
- Lease/ownership: freehold or long-leasehold (15+ years remaining) typical requirement
What's changed in 2025-2026
- PPA rates have come down from 2022-2023 peaks, institutional capital has returned to the market
- Longer-term PPAs are increasingly available, 30-35 year terms now offered by several funders
- Battery storage integration economics have improved significantly, many new PPAs include battery options
- Multi-site portfolio deals are increasingly common, funders price portfolio risk more attractively than single-site
- DNO grid headroom remains the biggest single constraint in some regions, early engagement is critical
Outlook for 2027 and beyond
Three factors will define the next phase of commercial solar adoption:
- Grid modernisation, Ofgem's RIIO-3 framework should release significant DNO investment, unlocking capacity in constrained regions
- Co-located battery storage, solar + storage becomes the default, particularly for sites with high evening peaks
- EV integration, solar carports + fleet electrification creates a natural pairing for logistics, retail, and public sector estates
How to start: free site assessment
Every UK commercial site has a different solar PPA economic case. The right starting point is a free assessment of your specific situation: roof condition, available area, electricity consumption profile, grid capacity, and lease/ownership context. We respond with an indicative PPA rate within 5-10 working days.