150 kWp commercial solar PV cost in the UK (2026)
At 2026 prices, a 150 kWp commercial solar PV system costs £120,000 - £148,500 installed (excl. VAT). Typical post-tax payback: 3.4-4.7 years.
150 kWp cost summary
| System size | 150 kWp |
| Installed cost (2026, excl. VAT) | £120,000 - £148,500 |
| £/Wp | £0.80 - £0.99 |
| Number of panels (450W) | ~330 |
| Roof area required | ~840 m² |
| Annual generation (UK avg) | 142,500 kWh |
| Best fit for | factory, hotel chain, university hall, supermarket |
| Best grant stack | Full Expensing + SEG + IETF candidacy (if energy-intensive) + regional grant £8k-£20k |
Year-1 maths breakdown
| Gross capex (mid) | £134,250 |
| 100% Full Expensing tax saving (25% CT) | -£33,562 |
| Net effective cost | £100,688 |
| Annual self-consumption (55%) | 78,375 kWh saving £19,594/year |
| Annual SEG export (45%) | 64,125 kWh earning £1,924 - £9,619/year |
| Total year-1 savings/revenue | £21,518 - £29,212 |
| Post-tax payback | 3.4 - 4.7 years |
150 kWp commercial solar · FAQs
How much does a 150 kWp commercial solar system cost in 2026?
At 2026 prices, a 150 kWp commercial solar PV system costs approximately £120,000 - £148,500 installed (excl. VAT). After 100% Full Expensing tax relief for a limited company at the 25% main CT rate, net cost is around £90,000 - £111,375.
What is the payback period for a 150 kWp commercial solar system?
With 55% self-consumption and SEG export tariffs of 3p-15p/kWh, a 150 kWp system typically pays back in 3.4-4.7 years post-tax.
What size roof is needed for a 150 kWp system?
A 150 kWp system requires approximately 840 m² of unshaded roof area — around 330 450W panels.
How much electricity will a 150 kWp system generate?
A 150 kWp system generates approximately 142,500 kWh per year in UK conditions. Best fit for factory, hotel chain, university hall, supermarket.
Which grants apply to a 150 kWp system?
Best grant fit: Full Expensing + SEG + IETF candidacy (if energy-intensive) + regional grant £8k-£20k. Always use the eligibility calculator for a personalised match.
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