Business electricity rates in the UK remain stubbornly high, with many Suffolk SMEs paying 28–38p/kWh depending on contract terms. For businesses with large, unshaded roof spaces — warehouses, manufacturing units, farms, and distribution centres — commercial solar PV offers some of the strongest returns available in 2025.
Why Commercial Solar Works in Suffolk
Suffolk has excellent solar irradiance for the UK. A south-facing commercial roof in Ipswich or Felixstowe receives roughly 1,000–1,100 equivalent peak sun hours per year. Flat warehouse roofs are ideal — easy access, no shading from chimneys or trees, and ample space for large arrays. Many commercial properties also have high daytime electricity usage, meaning self-consumption rates of 70–85% without needing batteries.
System Sizes and Costs
Typical commercial systems range from 20kW to 250kW. A 50kW system costs £35,000–£45,000 installed, including inverters, mounting, cabling and MCS certification. A 100kW system is £65,000–£85,000. Above 50kW, you move from domestic to commercial MCS accreditation, but the principles are the same. ELECSI is fully MCS-certified for commercial installations up to 1MW.
Savings and Payback
A 50kW system generating 45,000 kWh annually, with 75% self-consumption at 32p/kWh, saves £10,800 per year on electricity bills. The remaining 25% exported earns roughly £1,800 via SEG. Total annual benefit: £12,600. At a £40,000 installation cost, payback is 3.2 years. With panels warrantied for 25 years, the remaining 22 years generate near-free electricity worth £220,000+.
Tax Benefits: Full Expensing
Through April 2026, UK businesses can claim 100% first-year capital allowances on solar PV installations under the full expensing scheme. A £50,000 system reduces your corporation tax bill by £12,500 in year one (at 25% rate). This effectively cuts your net installation cost to £37,500 and drops payback to 2.4 years.
Smart Export Guarantee for Businesses
Unlike the old Feed-in Tariff, the Smart Export Guarantee requires energy suppliers to pay for exported electricity, but rates vary. Octopus Agile Export pays market-linked rates that have averaged 15–20p/kWh. For businesses with predictable export patterns, we can advise on the best SEG tariff for your system size and usage profile.
Battery Storage for Commercial
While commercial batteries are expensive (£400–£600 per kWh), they make sense if your business has high evening usage or is on a time-of-use tariff. A 30kWh battery charged by solar during the day and discharged during peak evening rates can save £2,000–£3,000 annually. We model this precisely during our commercial consultation.
Planning and Grid Connection
Commercial installations under 50kW typically do not require planning permission if on an existing building. Above 50kW, a DNO (Distribution Network Operator) application is required to confirm grid capacity. UK Power Networks manages Suffolk's grid. We handle all DNO paperwork as part of our service. Lead times are currently 4–8 weeks.
Frequently Asked Questions
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ELECSI provides free, no-obligation quotes for solar, EV charging, battery storage and electrical work across Suffolk.