Solar Panels for Business: UK Guide

UK business solar pricing (2026, ex VAT):

| System Size | Typical Business | Cost (ex VAT) | After Tax Relief | Annual Savings | Payback | |-----------|-----------------|--------------|-----------------|---------------|----------| | 10kW | Small office | £10,000–£14,000 | £7,500–£10,500 | £2,000–£3,000 | 3–5 yrs | | 30kW | Medium office | £24,000–£36,000 | £18,000–£27,000 | £5,000–£8,000 | 3–5 yrs | | 50kW | Warehouse/shop | £40,000–£60,000 | £30,000–£45,000 | £8,000–£12,000 | 4–5 yrs | | 100kW | Factory/supermarket | £70,000–£100,000 | £52,500–£75,000 | £16,000–£24,000 | 3–5 yrs |

*Tax relief = 25% corporation tax saving from full expensing. VAT-registered businesses also recover 20% VAT.*

Why business solar has faster payback than residential: 1. Lower cost per kWp (£700–£1,200 vs £1,300–£1,800 residential) 2. Higher daytime self-consumption (businesses operate during peak solar) 3. 100% first-year tax deduction (not available to individuals) 4. VAT recovery (not available to individuals — residential is 0% anyway) 5. Higher electricity costs for business (sometimes 30p+ per kWh)

Source: MCS commercial installer pricing; HMRC full expensing.

100% First-Year Capital Allowance (Full Expensing):

UK businesses can deduct the ENTIRE cost of solar panels from taxable profit in year 1.

Example: 50kW system at £50,000 (ex VAT): - Corporation tax rate: 25% - Tax deduction: 25% × £50,000 = £12,500 saved immediately - Effective cost: £50,000 – £12,500 = £37,500

Combined with VAT recovery: - Gross cost: £50,000 + £10,000 VAT = £60,000 - VAT recovered: –£10,000 - Tax relief: –£12,500 - Effective cost: £37,500 (37.5% less than headline price)

This applies to: - Limited companies (corporation tax payers) - Sole traders and partnerships (income tax payers — same principle via capital allowances) - All business premises (offices, shops, warehouses, factories, farms)

It does NOT apply to: - Residential landlords installing on rental properties (landlords claim through different capital allowance rules) - Personal installations on your own home

Source: HMRC full expensing guidance; Finance Act provisions.

Businesses have a natural advantage over residential solar: consumption aligns with generation.

Residential pattern: - Peak consumption: 5pm–10pm (cooking, heating, entertainment) - Peak solar: 10am–3pm - Mismatch: 50% self-consumption without battery

Business pattern: - Peak consumption: 8am–6pm (lighting, HVAC, equipment, IT) - Peak solar: 10am–3pm - Alignment: 60–80% self-consumption without battery

This higher self-consumption means businesses extract more value per kWh generated — each kWh offsets a 25–35p grid import (business rates are often higher than residential).

Result: Business solar ROI is fundamentally stronger than residential because the timing naturally aligns.

Source: Business energy consumption patterns; non-domestic electricity rates.

Beyond financial returns, business solar delivers:

• Carbon reduction: Measurable, reportable CO2 savings for ESG reporting
• SECR compliance: Streamlined Energy and Carbon Reporting requires large companies to report energy use and emissions. Solar reduces both.
• Supply chain requirements: Major retailers (Tesco, Sainsbury's, Amazon) increasingly require suppliers to demonstrate carbon reduction. Solar is a visible, verifiable measure.
• Customer perception: 73% of UK consumers prefer to buy from environmentally responsible businesses (Deloitte survey).
• Staff recruitment: Environmental credentials help attract younger talent who prioritise sustainability.
• B Corp and ISO 14001: Solar installation demonstrates environmental commitment for certification purposes.

Solar is one of the most visible, measurable, and cost-effective ESG actions a business can take — it earns money while reducing carbon.

Source: Deloitte consumer survey; SECR requirements; B Corp standards.