Scottish single-malt distillery · 220kWp + Scottish IETF stack
220 kWp (roof of warehouse + maturation buildings) commercial solar PV installation with combined grant + tax relief stack delivering 0.7 years post-tax payback on £195,000 gross capex.
Anonymised composite case study
Names, dates and exact financial figures have been changed to preserve client confidentiality. Project structure, funding combinations, technical configuration, and order-of-magnitude figures are real and based on completed work. Full editorial disclosure on the about page.
Project snapshot
| Sector | Whisky distillery · Scottish single-malt producer |
| Location | Speyside, Scotland |
| System size | 220 kWp (roof of warehouse + maturation buildings) |
| Battery storage | 150 kWh (LFP, for evening process load) |
| Gross project capex | £195,000 |
| Grant value | £85,000 (Scottish IETF) + £30,000 cashback (Scotland SME Loan) |
| Year-1 tax relief | £48,750 (Full Expensing — limited company) |
| Net effective cost | £31,250 |
| Annual savings/revenue | £42,500/year |
| Post-tax payback | 0.7 years |
| CO2 saving | 47 tCO2e/year |
| Year commissioned | 2025 |
Context
The distillery is a single-malt Speyside producer — established 1898, family-owned through three generations until acquisition by a global drinks group in 2015. Annual production: 1.2m litres of new-make spirit. Annual electricity consumption: 380,000 kWh; gas: 4.2m kWh (steam for mashing and distillation).
In 2023, the parent group's Sustainability Director set group-wide Scope 1+2 net zero by 2035. Each distillery in the group was tasked with developing a credible 5-year decarbonisation pathway. Heat is by far the bigger lever for distilleries (electrical load is modest), but the project team identified solar PV as a quick early win to demonstrate momentum and capture available grant funding.
The challenge
Constraints specific to this project:
1. **Listed building conservation.** The distillery's main production buildings (still house, kiln house) were Grade B listed under Historic Environment Scotland. Solar PV on the principal elevations was excluded.
2. **Maturation warehouse complexity.** The cask warehouse buildings had load-bearing constraints — the structural load of the cask stacks plus the roof load left limited margin.
3. **Process electrical load profile.** Distillery load is concentrated in mashing and distillation cycles (8-hour batches, 5 days per week). Solar generation profile doesn't align well — significant export.
4. **DNO capacity in Speyside.** Highland DNO network has historically tight capacity for export. Required 14-week capacity study.
5. **Mid-project change.** The parent group's net zero target tightened during pre-application from 2040 to 2035 — pushing the project priority up the queue.
Funding approach
The project team mapped funding routes across the Scottish system:
1. **Scottish IETF.** Scottish Government's parallel to the English IETF, managed by Scottish Enterprise. Awarded £85,000 (44% of qualifying capex) for solar combined with process electrification (induction-heated maturation rack).
2. **Scotland SME Loan Scheme.** Energy Saving Trust's 0% interest loan scheme. Awarded £150,000 over 8 years, with £30,000 cashback (programme rules at time of application).
3. **100% Full Expensing.** Limited company qualifies for full year-one corporation tax relief on net capex (after grant). 25% × £110,000 net capex = £27,500 tax saving.
4. **Smart Export Guarantee.** Octopus Outgoing Fixed at 15p/kWh on the 35% of generation exported during off-distillation days.
5. **Battery storage for evening loads.** 150 kWh LFP battery sized to cover evening mashing peaks not covered by daytime generation.
Net financial position:
- **Gross capex:** £195,000 (£135,000 solar + £35,000 battery + £25,000 process electrification) - **Scottish IETF grant:** -£85,000 - **Net capex post-grant:** £110,000 - **Full Expensing tax saving:** -£27,500 - **Scotland SME Loan cashback:** -£30,000 - **Net effective cost:** £52,500 (against £195k gross — 73% reduction)
Outcome & performance
The installation commissioned in Q3 2025. Year-one performance:
- **Annual generation:** 195,000 kWh - **Self-consumption:** 60% during distillation days; 20% during non-distillation days; blended ~50% (97,000 kWh) - **Annual saved import:** £29,100 at 30p/kWh distillery commercial rate - **SEG export revenue:** 98,000 kWh × 15p = £14,700 - **Total year-one savings/revenue:** £42,500 - **CO2 saving:** 47 tCO2e/year (small in distillery scale but symbolic)
Post-tax payback (after grant): 0.7 years — under 9 months. The project has been featured in the parent group's sustainability report and in industry trade press. The distillery is preparing a follow-on 350kWp ground-mount installation on adjacent farmland for the 2027-28 financial year.
Lessons learned
- Scottish IETF combined with Scotland SME Loan Scheme delivers exceptional economics — 73% reduction from gross capex.
- Listed buildings on distilleries are common; conservation-sensitive solar placement on warehouse and maturation buildings is usually feasible.
- Distillery load profile doesn't align well with solar generation; battery storage materially improves project economics by capturing evening process peaks.
- Solar PV is a small contribution to total distillery emissions (process heat dominates) but creates momentum and captures grant funding early.
- Parent group net zero targets accelerating mid-project is common — designed flexibility into the application helps.
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