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Solar off-grid horticulture cold hub — Kenya
Horticulture exporter cooperative built a fully solar-powered cold hub with battery + thermal storage for flowers, avocado and French bean exports to EU markets — no grid connection.
Naivasha, Kenya 3,200 m² · 4,500 pallet positions +2 °C chill, −5 °C freeze
Challenge
- Grid extension quoted at US$ 2.1M with 30-month lead time.
- Post-harvest losses at 22% due to lack of forced-air pre-cooling.
- EU GlobalG.A.P. and cold-chain audit requirements from buyers.
ColdMatch solution
- 1.6 MWp PV + 3.2 MWh Li-ion BESS + 1.4 MWh ice-bank thermal storage.
- Low-charge NH₃/glycol plant (95 kg NH₃) + 4 forced-air pre-cooling tunnels.
- Diesel genset (N+1, 400 kVA) for <3% annual runtime backup only.
- ColdMatch structured GCF + AfDB green finance blended with cooperative equity.
Project scope
- Civil: 3,200 m² insulated envelope, 4 pre-cooling tunnels, dock-level loading.
- Mechanical: low-charge NH₃/glycol plant 620 kW, 4× forced-air tunnels @ 20 t/hr.
- Solar/storage: 1.6 MWp bifacial PV, 3.2 MWh Li-ion BESS, 1.4 MWh ice-bank.
- Automation: SCADA + energy management, remote monitoring via GSM.
- Financing: GCF concessional + AfDB senior + cooperative equity — 10-yr tenor.
Key engineering metrics
- Cooling load
- 620 kW peak
- Solar fraction (annual)
- 94%
- Diesel runtime
- <3% / yr
- Pre-cool throughput
- 80 t/hr aggregate
- Refrigerant charge
- 95 kg NH₃ (low-charge)
- Post-harvest loss
- 22% → 6%
ROI & financial performance
- Capex
- US$ 6.8M
- Annual savings
- US$ 2.1M/yr (loss reduction + no diesel + export uplift)
- Payback
- 3.6 yrs
- IRR
- 26.2% (10-yr)
- NPV
- US$ 7.4M @ 9% WACC
- Energy reduction
- 94% grid-free (solar fraction)
- CO₂ reduction
- −1,850 t CO₂e/yr vs diesel BAU
“We skipped the grid connection entirely. Payback under four years and post-harvest loss down from 22% to 6%.”
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