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Grid Viability Assessment Tool

The Asset Auditor

Commercial Solar Feasibility & Revenue Calculator (2025)

Calculate the PPA value, Carbon Savings, and Tax Incentives for your commercial property.

Updated for 2025 Grid ConstraintsIndependent Assessment

Your Asset Details

Result Card

Potential System Size0 kWp
Annual Generation0 kWh
CO₂ Offset0 Tonnes
Est. Annual Savings£0
Construction Cost£0.00 (PPA)

Independent Assessment • No Obligation

How to finance your commercial solar

CapEx (Buy it)

You pay upfront (£100k+).

  • ✓ Highest Long-term ROI
  • ✓ Full Asset Ownership
  • ✗ High Capital Outlay

Asset Finance (Lease it)

Pay monthly, offset against tax.

  • ✓ Cashflow Positive
  • ✓ 100% Tax Deductible
  • • Medium ROI
Most Popular

Power Purchase Agreement (PPA)

£0 Upfront. Fund pays for everything. You get cheaper power. Read the full PPA guide →

  • ✓ Zero Capital Expenditure
  • ✓ Immediate Bill Reduction
  • ✓ Fully Maintained & Insured

Commercial Solar Panel Costs & ROI (2024)

Commercial solar installations cost £979-£1,278 per kW in 2024, with most businesses seeing payback within 3-5 years.

System SizeCost RangeAnnual SavingsPayback
20 kW£16,000-£30,000~£3,6004-6 years
50 kW£33,000-£60,000~£9,0003-5 years
100 kW£60,000-£120,000~£18,0003-5 years
16-45%
Annual ROI
3-5 yrs
Typical Payback
25+ yrs
System Lifespan
Revenue Multiplier

Don't just save on bills. Generate new revenue.

Add EV Charging to your solar car park project. Funded options available to monetize your parking spaces.

Calculate EV Revenue

Is your property eligible?

Most commercial solar car park installers require a minimum of 30 parking spaces or a roof area of at least 500 sq meters to ensure financial viability for a fully funded PPA Model.

Our commercial solar ROI calculator helps you assess viability for offices, industrial units, logistics centres, and retail parks. Projects falling below these thresholds may still be viable via CapEx or Asset Finance models.

Popular: Warehouse Solar | London Solar Guide | EV Revenue Calculator | G98 vs G99

Commercial Solar FAQs

Frequently Asked Questions

Commercial solar panels cost £979-£1,278 per kW installed in 2024. A typical 50kW system costs £33,000-£60,000, while a 100kW system costs £60,000-£120,000. Costs vary based on panel quality, roof type, and installation complexity.
Commercial solar panels typically deliver 16-45% annual ROI depending on system size and energy usage. Most businesses achieve payback within 3-5 years, with systems lasting 25+ years. Enhanced Capital Allowances can further improve returns.
A Power Purchase Agreement (PPA) lets you get solar panels installed at zero upfront cost. A third party owns and maintains the system, and you buy the electricity at a fixed rate lower than grid prices. Typical PPA rates are 30-50% below standard commercial electricity prices.
While direct grants are limited, businesses can claim 100% first-year tax relief through Enhanced Capital Allowances. Systems under 1MW with battery storage qualify for 0% VAT. The Smart Export Guarantee (SEG) pays for surplus electricity exported to the grid.
A 30kW commercial solar system can save approximately £5,400 annually on electricity costs. Solar generates power at 4-5p/kWh compared to 20-25p/kWh grid electricity, reducing bills by up to 50% during daylight hours.
System size depends on your roof space and electricity usage. A typical warehouse with 500m² roof can fit a 50-70kW system. For PPA eligibility, most providers require minimum 30 parking spaces or 500m² roof area to ensure financial viability.