Solar Panels for Industrial Units UK
Cut manufacturing electricity costs by up to 60%. 3-phase compatible systems designed for factories, workshops, and industrial estates.
Quick Answer
Industrial solar panels cost £750–£1,000/kWp installed. A 100kW system for a medium factory costs £75,000–£100,000, saves £16,000–£22,000/year, and pays back in 4–6 years. Compatible with 3-phase supplies and heavy machinery loads.
Industrial Units vs Warehouses: Why Solar Works Differently
Industrial units have fundamentally different energy profiles to warehouses. Manufacturing accounts for 29% of UK non-domestic electricity consumption. Higher base loads mean more solar is consumed on-site, improving ROI — but spiky demand and 3-phase machinery require careful system design.
| Factor | Warehouse / Logistics | Industrial / Manufacturing |
|---|---|---|
| Avg. electricity use | 8,829 kWh/year | 16,000–25,600 kWh/year |
| Energy drivers | Lighting, HVAC, forklifts | Heavy machinery, compressors, welding, CNC, refrigeration |
| Consumption pattern | Steady daytime load | Spiky demand, shift-dependent |
| Power supply | Single or 3-phase | Almost always 3-phase |
| Self-consumption | 60–75% | 65–80% (higher base load) |
| Roof type | Modern profiled metal | Mixed: metal, asbestos cement, saw-tooth |
| Battery value | Moderate (evening use) | High (peak shaving, shift coverage) |
Source: UK Non-Domestic National Energy Efficiency Data Framework 2024; Bionic business energy consumption data.
Food manufacturing is a standout sector for solar. Refrigeration and cold storage demand peaks during summer months — in direct alignment with maximum solar generation. Food factories routinely achieve self-consumption rates above 70%, delivering the fastest payback in the industrial sector.
Industrial Solar Panel Costs UK (2026)
Industrial solar costs £750–£1,000 per kWp installed. Larger systems cost less per kWp due to economies of scale.
| Industrial Unit | System Size | Cost Range | Annual Savings |
|---|---|---|---|
| Small workshop (300–500m²) | 30–50 kW | £25,000 – £50,000 | £5,000 – £9,000 |
| Medium unit (500–1,000m²) | 50–100 kW | £40,000 – £100,000 | £9,000 – £18,000 |
| Large factory (1,000–3,000m²) | 100–350 kW | £75,000 – £300,000 | £18,000 – £55,000 |
| Industrial estate (3,000m²+) | 350+ kW | £250,000+ | £55,000+ |
Annual Investment Allowance (AIA)
The AIA is permanently set at £1 million, allowing 100% of the solar installation cost to be deducted from pre-tax profits in year one. At 25% corporation tax, this effectively provides a 25% subsidy on the total project cost.
Business Rates Exemption
Rooftop solar is 100% exempt from business rates until 2035. Adding panels will not increase your rateable value. Commercial solar under 1MW also benefits from 0% VAT until March 2027.
Zero Upfront Cost: PPA for Industrial Units
A Power Purchase Agreement (PPA) lets you install solar at £0 upfront. A third party funds, installs, and maintains the system. You buy electricity at a fixed rate, typically 30–50% below grid prices.
PPAs work best for industrial units with 500m²+ roof space and stable daytime energy consumption. Minimum contract: typically 15–25 years.
3-Phase Solar for Industrial Buildings
Most industrial units run on 3-phase power supplies. Solar integrates seamlessly with 3-phase infrastructure using commercial-grade inverters that balance generation across all three phases.
3-phase string inverters
Systems under 100kW typically use multiple string inverters connected across all three phases. Brands like SMA, Huawei, and SolarEdge offer commercial 3-phase units rated 15–100kW.
Central inverters for larger systems
Systems over 100kW may use central inverters (100–500kW per unit) for simpler installation and lower cost per kW. These connect directly to the site's distribution board.
Peak demand management
Solar reduces your maximum demand charge (kVA) during daylight hours. For industrial units paying £30–£50/kVA/month in demand charges, solar can save £5,000–£15,000/year in demand-related costs alone.
Grid connection: G98 vs G99
Systems under 50kW use a simple G98 notification (free, instant). Systems over 50kW require a G99 application (costs £2k–£10k+, takes 45–90 days).
Industrial Roof Types & Solar Suitability
Industrial buildings have more varied roof types than modern warehouses. Here's what works and what needs extra consideration.
Profiled Metal Roofing (most common)
Standard for post-1990 industrial units. Panels mount with rail clamps directly to the roof purlins. No penetrations needed. Adds ~12–15 kg/m² to roof load. Ideal for solar.
Asbestos Cement Roofing
Common on pre-1990 industrial units. Cannot mount panels directly. Options: (1) Over-cladding — install new metal cladding over the asbestos, then mount panels (£30–£50/m² additional cost). (2) Full re-roof — remove asbestos and replace (£80–£120/m², but may be due anyway). An asbestos survey (£300–£500) is required before any work.
Saw-Tooth / North-Light Roofs
Older factories with angled roof sections and vertical glazing. Panels can be mounted on the south-facing slopes, though usable area is reduced by 30–50% compared to a flat roof. The vertical glazing sections cannot be used. A specialist mounting design is needed.
Flat Concrete / Membrane Roofs
Common on newer industrial estates. Panels use ballasted mounting frames angled at 10–15°. Slightly heavier (~18–22 kg/m²) than metal roof systems. A structural survey is recommended for older concrete roofs.
Battery Storage for Industrial Solar
Battery storage is especially valuable for industrial units because of peak demand charges and shift patterns. Manufacturing sites often pay £30–£50/kVA/month in maximum demand charges — batteries can shave these peaks significantly.
Battery charges from solar during low-demand periods and discharges during peak production, reducing your maximum demand charge by 20–40%.
Store daytime solar for evening or night shifts. A 200kWh battery can cover 4–6 hours of moderate industrial load beyond daylight hours.
Industrial batteries can earn additional revenue from frequency response and demand flexibility services — typically £5,000–£15,000/year for a 100kWh+ system.
| BESS Capacity | PV System Size | Typical Application |
|---|---|---|
| 125kW / 261kWh | 200 kW | Medium factory, single shift |
| 500kW / 552kWh | 500 kW | Large cold storage / food processing |
| 500kW / 1,104kWh | 500+ kW | 24/7 manufacturing, multi-shift |
Learn more about battery storage economics and land lease rates for standalone BESS projects.
UK Industrial Solar Case Studies
Real results from UK manufacturing and industrial solar installations.
Gressingham Foods, Suffolk
System: 3.27 MW (5,100 panels)
Coverage: 25%+ of site demand
CO² Reduction: 670 tonnes/year
Funding: £0 upfront (PPA with Centrica)
One of the UK's largest behind-the-meter food sector installations. Poultry processing's high cooling loads align perfectly with peak solar generation hours.
Principal Doorsets
System: 544 kW (1,296 Trina panels)
CO² Saved: 65,000+ kg to date
Payback: 3–5 years
High-intensity fabrication line with SolarEdge optimised inverters. Constant daytime machinery load delivers excellent self-consumption and fast payback.
JJ Foodservice, Leicester
System: 335 kW
Output: 385 MWh in first year
Use: Powers cold storage & fulfilment
SolarEdge module-level optimisation across large rooftop. Majority of generation consumed on-site for large-scale refrigeration and distribution operations.
Grant Funding for Industrial Solar (2026)
Beyond tax relief, UK manufacturers can access grant funding to further reduce solar investment costs.
Industrial Energy Transformation Fund (IETF)
Up to £500 million available through 2028 for high-energy-use businesses. Supports deployment of energy efficiency technologies and deep decarbonisation solutions in manufacturing.
Eligibility: must demonstrate significant carbon reduction and energy savings in live production environments.
Made Smarter Adoption Grants
Regional grants of £15,000–£50,000 for manufacturing SMEs investing in energy-efficient upgrades including solar PV and smart energy management systems.
Available in select regions (e.g., East Midlands, North West). Check regional availability before applying.
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