UK manufacturing warehouses combine the largest commercial roof estate with the highest daytime electrical baseload of any commercial sector. Process loads from injection moulding, CNC machining, automated assembly, paint lines, packaging, food production, and pharmaceutical manufacturing typically run 12–24 hours a day at high power factor. Self-consumption ratios of 85–95% are routine. Combined with the largest available roof areas (typically 50,000–250,000 sqm of clear-span steel-portal roof), manufacturing PV regularly produces the largest absolute carbon abatement and cost saving in UK commercial solar.
Why solar PV fits manufacturing solar
- 85–95% self-consumption from continuous process loads
- IETF grant funding available for energy-intensive eligible operations (30–50% intervention rate)
- ESOS Phase 4 audit recommendations directly support solar business case
- ISO 50001 energy management certification aligned
- SECR mandatory reporting metrics directly supported by audit-ready monitoring
- Capital allowance treatment (100% AIA + 50% FYA) maximally beneficial at scale
System design and sizing
Manufacturing PV sizing is typically baseload-led not roof-led. Pull HH meter data and identify the daytime baseload — for most manufacturing operations this exceeds 70% of peak demand. Size to baseload + 10–15% headroom for export/battery. Above 1 MW, battery storage becomes increasingly economic for evening shift coverage.
Process load profile drives the design. Continuous process operations (food, pharma, plastics, electronics) absorb essentially all generation; shift-pattern operations (engineering, automotive component) require more careful self-consumption modelling. Power factor correction is sometimes a project add-on where the existing site has poor PF.
Compliance and regulation
ESOS Phase 4 (compliance deadline December 2027 for next cycle) audit recommendations must be implemented or rationale documented — solar typically appears as a positive recommendation. ISO 50001 certification scope expansion to include solar is straightforward. SECR mandatory annual reporting for large UK companies — solar generation directly improves Scope 2 metric. IETF for eligible SIC codes.
Recent install — 2.1 MW install on West Midlands Tier-1 automotive supplier
A West Midlands Tier-1 automotive supplier serving Jaguar Land Rover, Aston Martin, and Bentley. 220,000 sqft manufacturing warehouse with injection moulding and assembly. Energy spend £1.2m/year. Owner-occupier.
System
2.1 MW (3,860 panels)
Annual generation
1,940,000 kWh
Annual saving
£385,000
Payback
4.7 years
Self-consumption
93%
Outcome: Self-funded with 100% AIA + 50% FYA tax shield. Used in JLR supplier audit (achieved Tier 1 sustainability rating). Phase 2 battery storage in commissioning.
Common questions about manufacturing solar
How does ESOS Phase 4 compliance interact with solar?
ESOS Phase 4 (next compliance cycle deadline December 2027) audit recommendations must be implemented or have documented rationale for non-implementation. Solar PV is typically a recommended action because it directly reduces Scope 2 emissions from grid electricity. The ESOS audit findings are valuable supporting documentation in board-level capex approval for solar projects.
Can we qualify for IETF (Industrial Energy Transformation Fund)?
IETF eligibility depends on SIC code, energy intensity, and quantified emissions reduction. Eligible sectors include food and drink manufacturing, chemicals, ceramics, glass, paper, metals, and textiles. Where eligible, IETF provides 30–50% capital intervention rates on £100k–£30m projects. We support the application alongside standard project delivery.
How does SECR reporting align with solar?
SECR (Streamlined Energy and Carbon Reporting) is mandatory for large UK companies (turnover >£36m, balance sheet >£18m, employees >250). Annual reports must include Scope 1 and Scope 2 emissions. Solar PV directly reduces Scope 2 — the certified monthly generation export from our monitoring platform is auditable input to your SECR submission.
Will the system cope with our power factor correction needs?
We complete a power factor analysis as part of the structural and electrical survey. Where existing PF is below 0.95, the project sometimes includes PF correction as an add-on. Modern string inverters offer reactive power capability that can support PF correction directly without additional equipment.
How do we handle 24/7 process operations during install?
Roof installation happens above operations. Final grid synchronisation requires a planned 4–8 hour outage which we schedule with operations to align with planned maintenance shutdowns or weekend non-production periods. For genuine 24/7 operations without scheduled shutdowns, we use temporary alternative supply arrangements during synchronisation.