Why Food and Drink Factories Suit Solar So Well
Food and drink manufacturing accounts for approximately 19% of UK manufacturing turnover (Food and Drink Federation, 2025) and employs over 450,000 people across approximately 12,000 sites. The sector is characterised by high and consistent electricity demand, large single-storey buildings with extensive flat roofing, and predominantly daytime operating patterns — all of which combine to create outstanding solar investment opportunities.
The Food Factory Solar Advantage
- High and consistent electricity demand — typically £200,000–£2 million/year for medium to large sites
- Large flat roofs (standard in food manufacturing buildings) support ballasted solar with no penetrations
- Day and early-morning shifts align with solar generation hours, enabling 70–90% self-consumption
- Retail customer and grocery retailer ESG requirements increasingly mandate renewable energy credentials
- BRCGS and BRC Global Standards reward documented environmental performance improvements
- Own-label manufacturer contracts often include sustainability scoring that solar directly addresses
The UK food and drink sector spent approximately £4.2 billion on energy in 2024 (FDF), of which electricity represented the largest proportion for most manufacturing sub-sectors. With electricity prices at 28–32p/kWh for industrial consumers in 2026 — more than double the pre-2021 average — the financial case for factory solar in food manufacturing has never been stronger.
Energy Consumption Profile: Refrigeration, Processing, Packaging
Understanding the electricity consumption profile of a food or drink manufacturing site is essential for designing an effective solar system. Different sub-sectors have markedly different consumption patterns:
| Process | Typical % of Site Electricity | Load Pattern | Solar Compatibility |
|---|---|---|---|
| Refrigeration and cold storage | 25–45% | Continuous (24/7) | Good with battery storage; moderate without |
| Processing (mixing, cooking, pasteurisation) | 20–30% | Shift-based (typically daytime) | High — coincides well with solar |
| Packaging lines | 10–20% | Shift-based (typically daytime) | High — coincides well with solar |
| Compressed air | 10–15% | Shift-based; some continuous | Good — daytime use aligns with generation |
| HVAC and ventilation | 8–15% | Continuous with daytime peaks | High — HVAC peaks often align with solar peaks |
| Lighting | 5–10% | Shift-based | High — especially for daytime shifts |
The defining characteristic of food factory energy profiles is the split between continuous loads (refrigeration) and shift-based loads (processing, packaging). Solar without battery storage is highly effective for the shift-based loads — typically achieving 70–85% self-consumption during operational hours. Adding battery storage extends solar value into refrigeration-dominated overnight periods, improving overall self-consumption to 80–90% of annual generation.
Typical Solar System Sizes for Food Manufacturing
The table below provides benchmark system sizes and financial projections for typical UK food and drink manufacturing facilities. All projections assume 80% self-consumption, 30p/kWh electricity rate, and 3% annual electricity price inflation.
| Facility Type | Annual Elec. Use | System Size | Install Cost | Year 1 Saving | Payback |
|---|---|---|---|---|---|
| Small bakery / deli | 250–500 MWh | 50–100 kWp | £45,000–£80,000 | £11,400–£22,800 | 3.5–4.5 yrs |
| Medium food producer | 1,000–2,500 MWh | 200–500 kWp | £150,000–£340,000 | £46,000–£114,000 | 3.0–3.5 yrs |
| Large food manufacturer | 2,500–7,500 MWh | 500–1,500 kWp | £340,000–£990,000 | £114,000–£342,000 | 2.9–3.0 yrs |
| Large dairy / brewery | 7,500–20,000 MWh | 1,500–3,500 kWp | £990,000–£2.2m | £342,000–£798,000 | 2.8 yrs |
The economies of scale in solar installation mean that larger systems achieve progressively lower cost per kWp. A 100kW system typically costs £700–£800 per kWp installed, while a 1,000kW system reduces to £550–£650 per kWp. This means larger food factories enjoy both higher absolute savings and better payback economics than smaller operations.
ROI Benchmarks for Food Factories
Food manufacturing is consistently among the highest-returning solar investment sectors in UK industry. The combination of high electricity spend, large roof areas, daytime operations and consistent demand makes the economics compelling across a wide range of facility sizes.
Typical simple payback for food factory solar at 2026 electricity prices of 28–32p/kWh
25-year IRR for a typical food factory solar installation, accounting for 3% electricity price inflation
Typical percentage reduction in purchased grid electricity for a well-sized food factory solar system
The 25-year financial model for a 400kW food factory solar system illustrates the scale of the return. At an installation cost of £275,000 (ex-VAT), with Full Expensing reducing the effective cost to approximately £206,000 (at 25% corporation tax), the system generates net cumulative savings of approximately £1.7 million over 25 years — a return of over 8:1 on effective capital deployed, assuming electricity price inflation of 3% annually from a 30p/kWh 2026 base.
Refrigeration Load Shifting with Battery Storage
Refrigeration is the dominant electricity consumer in most food processing, dairy and cold chain sites — accounting for 25–45% of total electricity use and running continuously 24 hours a day. This creates a structural challenge for solar without storage: solar generates primarily during 7am–5pm, but the refrigeration load runs overnight too. Without storage, 40–50% of solar generation may be exported at low SEG rates rather than self-consumed at the full grid rate.
Battery energy storage systems (BESS) solve this problem through two mechanisms:
1. Solar Surplus Capture
When solar generation exceeds site consumption during mid-afternoon periods, the surplus charges the battery instead of being exported. The stored energy discharges overnight to supply refrigeration loads, increasing effective self-consumption from the grid rate value of 30p/kWh rather than the export value of 4–6p/kWh. For a 500kW solar system with 200kWh of battery storage, this can add £8,000–£15,000/year to the system's financial return compared to solar-only operation.
2. Peak Demand Management
Food factories on half-hourly metered electricity tariffs face two cost components: a unit rate (p/kWh) and a capacity charge (£/kVA) based on maximum demand. The capacity charge rewards facilities for reducing their peak demand from the grid. Battery storage can be programmed to discharge during peak demand periods (typically 8–10am and 4–7pm on weekday winter evenings), reducing the maximum kVA recorded and saving on capacity charges. Combined with solar, a well-configured BESS can reduce a food factory's capacity charge by 15–30%, adding a significant secondary financial benefit beyond the generation saving.
Battery Storage Economics: 300kW Solar + 150kWh BESS at a Cold Store Facility
Solar only (no battery)
- Annual generation: 285,000 kWh
- Self-consumption rate: 52% (148,200 kWh)
- Export: 48% (136,800 kWh)
- Value at 30p/kWh self-consumed: £44,460
- Value at 5p/kWh exported: £6,840
- Total annual value: £51,300
Solar + 150kWh BESS
- Annual generation: 285,000 kWh
- Self-consumption rate: 78% (222,300 kWh)
- Export: 22% (62,700 kWh)
- Value at 30p/kWh self-consumed: £66,690
- Value at 5p/kWh exported: £3,135
- Peak demand saving (capacity charge): £14,000
- Total annual value: £83,825
Battery storage additional cost: approximately £90,000 (150kWh BESS). Additional annual value vs solar-only: £32,525/year. Additional payback on battery cost: 2.8 years.
BRCGS and BRC Global Standards — Solar's Compliance Benefits
The BRCGS Global Standard for Food Safety (Issue 9, published 2022) and the BRC Global Standards framework are the dominant food safety and quality certification schemes for UK food manufacturers supplying major retailers. Both standards have expanded their environmental and sustainability requirements in recent years, creating direct relevance for solar installation decisions.
BRCGS Issue 9: Environmental Management (Clause 5.4)
BRCGS Issue 9 Clause 5.4 requires certified sites to have documented environmental management programmes addressing energy use and greenhouse gas emissions. Sites must demonstrate active reduction of energy consumption and carbon emissions through documented targets and action plans. Solar installation directly satisfies this clause — providing verifiable, metered energy reduction data that can be presented to BRCGS auditors as evidence of an implemented environmental management action. Generation monitoring reports are ideal BRCGS audit evidence.
Retailer Sustainability Scorecards
The major UK grocery retailers — including Tesco, Sainsbury's, Marks & Spencer, Asda, Morrisons and Waitrose — all operate supplier sustainability programmes that include energy and carbon questions. For own-label manufacturers, sustainability scorecard performance can influence contract terms, new product opportunities and preferred supplier status. Questions typically cover: what percentage of electricity comes from renewable sources; what energy reduction targets have been set; what actions have been taken to reduce Scope 1 and 2 emissions. Solar installation provides direct, verifiable answers to all three categories.
SEDEX and Ethical Trade Reporting
Many food manufacturers use the SEDEX (Supplier Ethical Data Exchange) platform to share sustainability data with customers. SEDEX's SMETA audit protocol (Sedex Members Ethical Trade Audit) now includes environmental pillars covering energy use, emissions and resource management. Solar installations with monitoring data provide auditable evidence for SMETA environmental assessments, reducing audit risk and improving supplier sustainability ratings shared across the retail supply chain.
Case Study: 280 kWp Dairy Factory, Yorkshire
Independent Dairy Cooperative, North Yorkshire
Site Profile
- Location: Harrogate area, North Yorkshire
- Product: Pasteurised whole milk, cream, butter
- Employees: 85
- Building: 3,800m² single-storey flat roof
- Annual electricity: 1,620 MWh
- Annual electricity cost (pre-solar): £487,000
- Operation: Two shifts, 5am–9pm; refrigeration 24/7
Solar Installation
- System size: 280 kWp
- Panel count: 560 x 500W bifacial panels
- Inverters: 4 x Solis 70kW string inverters
- Battery storage: 120 kWh (2 x 60kWh units)
- Installation cost: £196,000 (ex-VAT)
- Annual generation: 266,000 kWh
- Self-consumption: 83% (220,780 kWh)
The dairy's two daily pasteurisation runs (6am–9am and 12pm–3pm) coincide with the highest solar generation periods, producing strong self-consumption alignment. Battery storage was configured to charge during the mid-morning solar surplus and discharge during the overnight refrigeration load (9pm–5am), increasing self-consumption from an estimated 65% (solar only) to 83%. The site achieved BRCGS recertification with an improved environmental management score in its first post-installation audit. The installation qualified for Full Expensing at 25% corporation tax, reducing the effective cost to £147,000 — producing a 2.4-year payback on effective capital deployed.
Getting Started — What to Check Before Commissioning
Before commissioning a solar installation for a food manufacturing site, the following checks will save time, money and potential complications during and after installation.
Roof Structural Survey
Commission a structural engineer's assessment of the roof before obtaining solar quotes. Ballasted flat-roof solar systems add 15–25 kg/m² of dead load. Older industrial roofs — particularly those with asbestos-containing materials (ACMs) — may need remediation before solar can be installed. Identifying roof condition early prevents surprises mid-installation. Your solar installer should provide a structural loading report as part of their design package; if they do not offer this, request it explicitly.
Obtain 12 Months of Half-Hourly Consumption Data
Request half-hourly electricity consumption data (HH data) from your electricity supplier or meter operator. This data — available for all half-hourly metered sites — shows your consumption at 30-minute intervals across every day of the year. It is essential for accurately sizing the solar system, projecting self-consumption, and modelling battery storage configuration. Sites without HH metering can request it from their DNO at low or no cost.
Check Planning and Grid Connection Requirements
Most rooftop solar installations do not require planning permission under permitted development rights (Class J, Commercial and Industrial). However, if your site is in a conservation area, is listed, or you are considering ground-mounted or car park canopy solar, planning permission will be required. For systems above 50kW, submit a grid connection enquiry to your Distribution Network Operator (DNO) early — allow 3–6 months for approval, and check whether any grid reinforcement costs apply to your connection point.
Check Lease and Landlord Consent Requirements
If you occupy the building as a leaseholder, review your lease for any alterations consent clauses that apply to roof modifications. Most commercial leases require landlord consent for structural alterations — a solar installation on the roof typically falls within this. Many landlords will consent, particularly given the EPC benefits. Formalise consent in a licence to alter or a lease variation. Ensure the lease addresses ownership of the solar installation on vacation of the premises.
Select an MCS-Certified Installer with Food Sector Experience
Ensure your chosen installer holds current MCS (Microgeneration Certification Scheme) certification for commercial solar — this is required for BRCGS evidence purposes and for SEG export registration. For food manufacturing sites specifically, look for experience with: bird and pest management systems as part of the installation (anti-roosting measures that comply with BRC pest control requirements); solar panel cleaning programmes that use potable water and food-safe detergents; and monitoring platforms that produce generation reports suitable for BRCGS audit evidence.
Frequently Asked Questions
How much can a food factory save with solar panels?
Does solar affect food safety or BRCGS certification?
Can battery storage help food factories with refrigeration loads?
What size solar system does a food factory need?
What are the main planning and grid connection requirements for food factory solar?
Trusted Solar Installers Across the UK
We work with a network of MCS-certified regional installers. If you need a recommendation outside our coverage area, these are the firms we trust:
- YEERS — Solar panels & heat pumps — Yorkshire
- ALPS Electrical — MCS-certified solar installer — Teesside & North East England
- Midland Solar — Commercial & industrial solar — West Midlands
- EC Eco Energy — UK-wide commercial solar & renewables installer
- Carbon Legacy — Solar & green energy solutions — East Midlands
- Green Hat Renewables — Solar & renewable energy — Cambridgeshire & East Anglia