Commercial solar PV is one of the most reliable capital investments available to a UK business in 2026 — fully tax-deductible against corporation tax under 100% Annual Investment Allowance, payback inside 4-7 years on most sites, 25 years of operating life, and a balance-sheet asset that meaningfully reduces ongoing operating cost. This page is the hub for everything we publish on commercial solar: what it is, how it works, who it's for, what it costs at every system size, the sectors and locations we serve, the project process, finance and grant routes, and pointers to every related decision page.
What is commercial solar PV?
Commercial solar PV (photovoltaic) is the deployment of solar panels and associated inverter and switchgear hardware on UK business premises — typically rooftop, sometimes ground-mount or carport — to generate electricity for on-site consumption with any surplus exported to the grid. The business sees three direct financial benefits: avoided import cost (every kWh generated and consumed on site replaces a kWh of imported grid electricity at typical 18-32 p/kWh), export revenue (every kWh generated above on-site demand is exported and paid for at 4-15 p/kWh under the Smart Export Guarantee), and corporation tax relief (the system is plant and machinery qualifying for 100% Annual Investment Allowance — see our capital allowances page).
Typical commercial deployments range from 30 kW (small office, ~100 panels, ~£35k turnkey) through 100 kW (mid-market warehouse or factory, ~300 panels, ~£100k) up to multi-megawatt utility-scale (~3,000+ panels, multi-million-pound projects). The 25-year design life is the operating norm for Tier 1 panels, with most systems still producing 80-92% of nameplate output at year 25.
How commercial solar PV actually works
The energy chain has three stages. Stage one — generation. Solar panels (each 400-700 W in 2026, mono-PERC or TOPCon cell architecture) convert sunlight into DC electricity. Each panel generates approximately 350-450 kWh per kW per year in UK climate. Stage two — conversion. The DC electricity is fed through inverters (string or central — see our best commercial solar inverters page) which convert DC to 230V or 400V AC at the same frequency and voltage as your existing site supply. Stage three — consumption and export. The AC output ties into your existing distribution board. When the building is using power, the solar generation reduces grid import. When the building is using less than the solar generates, surplus exports to the grid through your meter.
Self-consumption ratio (the percentage of generation consumed on site versus exported) is the single biggest variable in financial performance. Manufacturing, cold storage and hospitality typically achieve 80-95% self-consumption — ideal. Office spaces with weekday-only operating hours typically achieve 50-70% self-consumption — still strong but with more reliance on SEG export revenue. We model the self-consumption ratio against your half-hourly consumption data at quote stage so the financial projection is grounded in your actual usage profile.
Who commercial solar PV is for
Commercial solar PV works for almost every UK business with a commercial premises, but three customer segments dominate the strongest economic outcomes.
SMEs (£50k-£500k commercial energy spend). Single-site businesses with 100-500 kWp roof potential, typical install size 50-250 kW, capex £45k-£200k, payback 4-6 years, AIA fully utilised in year one. The dominant segment for our project work — see our are commercial solar panels worth it page for the financial case.
Mid-market industrials (£500k-£5m commercial energy spend). Larger sites with 500 kW-2 MW roof potential, typical install 250 kW-1 MW, capex £200k-£800k, payback 5-7 years, often with PPA finance routes — see our PPA service page. G99 connection process applies — see our G99 application page.
Large industrial and utility-scale (£5m+ commercial energy spend). Multi-building or multi-site portfolios, megawatt-scale installs, capex £1m+, payback 6-9 years. Commonly debt-financed against the operating savings, with HV connection considerations. See our industrial solar panels page and 500 kW-plus solar systems page.
Typical sizes and costs
System sizing matches roof area and consumption profile. Typical 2026 ranges:
- 30-50 kW: small offices, retail premises, dental practices, vet clinics. Typical cost £35k-£60k. Payback 4-6 years. Sub-100 kW so G98 fast-track applies. See 50 kW solar systems and 50 kW solar system cost.
- 100 kW: medium warehouses, factories, hotels, care homes. Typical cost £90k-£120k. Payback 4-6 years. Borderline G98/G99. See 100 kW solar systems and 100 kW solar system cost.
- 250 kW: large warehouses, manufacturing, schools, hospitals, multi-storey offices. Typical cost £190k-£240k. Payback 5-7 years. G99 applies. See 250 kW solar systems.
- 500 kW and above: very large warehouses, distribution centres, factories, industrial estates. Typical cost £350k-£475k upwards. Payback 5-8 years depending on self-consumption. See 500 kW+ solar systems.
For full pricing across all sizes see our cost guide, our commercial solar costs page or our solar panel costs page.
Sectors served
We deliver commercial solar across every business sector with a UK commercial premises. Each sector has specific characteristics — roof geometry, electrical infrastructure, operating hours, consumption profile — that drive the system design. Browse the sector pages for sector-specific design considerations and case studies.
Industrial and warehouse: factories, warehouses, cold storage, light industrial units, workshops and garages, self-storage, food and beverage manufacturing. Retail, hospitality and leisure: hotels, pubs, restaurants, cafes, retail showrooms, garden centres and leisure, gyms, hair salons. Public sector and care: schools, healthcare, care homes. Other commercial: offices, car dealerships, launderettes and car washes, mixed-use commercial. Specialist mounting: solar carports, ground-mounted. The full list is in our sectors index.
Locations served
We deliver commercial solar to UK businesses nationwide. Regional considerations matter — DNO performance, grid constraints, climate, local grants — and each city or region has its own characteristics. Browse our locations index for city-specific information including DNO region, typical project considerations, local industrial estates and case study examples. Major locations include London, Manchester, Birmingham, Leeds, Bristol, Liverpool, Sheffield, Newcastle, Glasgow, Edinburgh, Cardiff and Belfast — plus 20+ secondary cities and regional hubs.
The commercial solar process
Every commercial solar project moves through six phases: enquiry and desk feasibility, quote and survey, DNO application and procurement, physical install, commissioning and energisation, and ongoing operations and maintenance. Total elapsed time is 8 weeks for sub-100 kW healthy sites, up to 12-18 months for large G99 connections on constrained DNO networks. The full breakdown — phases, durations, what slows projects down, how to compress the timeline — is on our dedicated commercial solar installation timeline page.
Specific process pages dig into individual phases: commercial solar survey covers what we look at on site, G98 application covers connect-and-notify for sub-100 kW, G99 application covers the formal DNO study for above 100 kW, solar mounting systems covers roof-type-specific mounting, solar panel commissioning covers the testing and energisation phase, and commercial solar maintenance contract covers the post-energisation operating life.
Finance routes
Commercial solar can be financed through several distinct routes, each with different cash flow, balance sheet and risk implications. Outright cash purchase. Strongest IRR, full ownership, full AIA in year one. Right for cash-rich businesses. Asset finance and hire purchase. Spread the capex over 5-7 years with monthly repayments typically lower than the monthly energy savings — net positive cash flow from day one. Available through our finance partners. Power Purchase Agreement (PPA). Third-party owns the system and sells you the generated electricity at a fixed p/kWh rate (typically 12-18 p/kWh, materially below grid import). Zero capex, but lower lifetime savings than outright purchase. See our PPA service page. Lease. Operating lease over 7-15 years. Off-balance-sheet treatment in some cases (subject to IFRS 16 considerations).
Detailed comparison and modelling at our commercial solar finance page and finance options service page.
Grants and funding
Direct UK government solar grants for commercial businesses are limited in 2026, but several adjacent schemes contribute meaningfully to the financial case. 100% Annual Investment Allowance. Full capex offset against corporation tax — typically saves 19-25% of project cost depending on tax rate. See our capital allowances page. Smart Export Guarantee. 4-15 p/kWh paid for grid export, mandatory for licensed energy suppliers above a certain customer count. Sector-specific grants. Educational and healthcare estate decarbonisation funding, agricultural diversification grants, tourism and hospitality decarbonisation. Regional grants. Some local authorities and devolved administrations operate ad-hoc business decarbonisation funds.
The full landscape, refreshed quarterly, is on our grants and funding page and commercial solar grants page. Sector-specific grant guidance is on our sector pages.
FAQs and resources
For every common question, our FAQs page has dedicated answers. For technical depth on specific topics see best commercial solar inverters, commercial solar warranty, solar mounting systems, are commercial solar panels worth it, solar vs alternatives. Sector-specific case studies are on each of our sector pages. For our team, certifications and IWA backing see about and accreditations.
Useful authority links
The MCS (Microgeneration Certification Scheme) certifies UK solar installers and equipment: mcscertified.com. Ofgem regulates the Smart Export Guarantee and DNO connection processes: ofgem.gov.uk. UK government net zero strategy and business decarbonisation policy: gov.uk Net Zero Strategy. The Solar Energy UK trade association publishes industry data: solarenergyuk.org.
Get started
The starting point on every commercial solar project is desk feasibility — free, 5 working days, no commitment. Send us 12 months of half-hourly meter data, a roof drawing or recent satellite image of the site, and your MPAN. We will model an indicative system size, generation, offset percentage and payback against your actual consumption profile. From there, the next step is an on-site survey to convert the indicative quote into a fixed-price proposal. Head to request a quote or contact us to start the conversation.
Commercial solar PV — common questions
What is commercial solar PV?
Commercial solar PV (photovoltaic) is the deployment of solar panels and inverters on UK business premises to generate electricity for on-site consumption, with surplus exported to the grid through the Smart Export Guarantee (SEG). Typical commercial installs range from 30 kW (small office) to multi-megawatt (large industrial estates), generating between 25,000 and 1,000,000+ kWh per year depending on size and location.
How much does commercial solar PV cost in 2026?
Per-kW pricing in 2026 is £900-£1,200 for sub-100 kW systems, £750-£950 for 100-500 kW, and £700-£850 for 500 kW and above. A 50 kW system is typically £45,000-£60,000 turnkey. A 250 kW system is £190,000-£240,000. A 500 kW system is £350,000-£475,000. Pricing includes panels, inverters, mounting, cabling, switchgear, scaffolding, commissioning and DNO fees. 100% AIA (Annual Investment Allowance) means the full cost is offset against corporation tax in year one.
What is the typical payback period for commercial solar?
Typical payback in 2026 is 4-7 years for systems with strong self-consumption profiles (manufacturing, cold storage, hospitality, schools running through summer holidays). Longer payback (7-10 years) for systems with low self-consumption — typically office spaces with weekday-only usage. After payback the system generates effectively free electricity for the remaining 15-20 years of its 25-year design life. With 100% AIA, the post-tax payback is typically 30% shorter than the gross figure.
How long does a commercial solar project take from enquiry to switch-on?
Typical timeline 2026: 8-16 weeks for sub-100 kW (G98 fast-track), 4-9 months for 100-500 kW, 6-12 months for 500 kW and above. The DNO connection process is the dominant variable above 100 kW — see our G99 application page for the breakdown. For sub-100 kW the dominant variables are survey findings (asbestos, structural strengthening) and inverter lead times.
Do I need planning permission for commercial solar?
Most rooftop commercial solar installations in England qualify as Permitted Development under Class J of the General Permitted Development Order — no planning application required. Exceptions: listed buildings, conservation areas, AONBs, ground-mount systems above 9 sqm, and any installation on a protected building. Where planning is required (typically ground-mount and some carport applications), our team handles the application. Scotland and Wales have similar but distinct PD rights.
What grants are available for commercial solar in 2026?
Direct UK government solar grants for businesses are limited in 2026, but several adjacent schemes apply: 100% Annual Investment Allowance (full capex offset against corporation tax), Smart Export Guarantee (4-15p/kWh for grid export), business rates relief on installed plant in some regions, sector-specific grants (educational and healthcare estates, agricultural diversification, tourism). PPA (Power Purchase Agreement) routes provide effective zero-capex finance. See our grants and funding page for the current landscape.