750 kWp commercial solar PV cost in the UK (2026)
At 2026 prices, a 750 kWp commercial solar PV system costs £487,500 - £600,000 installed (excl. VAT). Typical post-tax payback: 3.3-6.6 years.
750 kWp cost summary
| System size | 750 kWp |
| Installed cost (2026, excl. VAT) | £487,500 - £600,000 |
| £/Wp | £0.65 - £0.80 |
| Number of panels (450W) | ~1,650 |
| Roof area required | ~4,200 m² |
| Annual generation (UK avg) | 712,500 kWh |
| Best fit for | large warehouse, factory, supermarket, hospital |
| Best grant stack | Full Expensing + IETF (industry) or PSDS (public) + REGO + SEG |
Year-1 maths breakdown
| Gross capex (mid) | £543,750 |
| 100% Full Expensing tax saving (25% CT) | -£135,938 |
| Net effective cost | £407,812 |
| Annual self-consumption (30%) | 213,750 kWh saving £47,025/year |
| Annual SEG export (70%) | 498,750 kWh earning £14,962 - £74,812/year |
| Total year-1 savings/revenue | £61,988 - £121,838 |
| Post-tax payback | 3.3 - 6.6 years |
750 kWp commercial solar · FAQs
How much does a 750 kWp commercial solar system cost in 2026?
At 2026 prices, a 750 kWp commercial solar PV system costs approximately £487,500 - £600,000 installed (excl. VAT). After 100% Full Expensing tax relief for a limited company at the 25% main CT rate, net cost is around £365,625 - £450,000.
What is the payback period for a 750 kWp commercial solar system?
With 30% self-consumption and SEG export tariffs of 3p-15p/kWh, a 750 kWp system typically pays back in 3.3-6.6 years post-tax.
What size roof is needed for a 750 kWp system?
A 750 kWp system requires approximately 4,200 m² of unshaded roof area — around 1,650 450W panels.
How much electricity will a 750 kWp system generate?
A 750 kWp system generates approximately 712,500 kWh per year in UK conditions. Best fit for large warehouse, factory, supermarket, hospital.
Which grants apply to a 750 kWp system?
Best grant fit: Full Expensing + IETF (industry) or PSDS (public) + REGO + SEG. Always use the eligibility calculator for a personalised match.
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