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Quick answer
A 1,000 MT apple CA storage can pay back in 18–28 months at full utilisation on a ₹5 crore project, or 12–18 months with 35% NHB subsidy, because July prices of ₹90–140/kg beat October harvest prices of ₹35–50/kg. CA holds apples at 0.5–1.5°C, 1–3% oxygen and 92–95% RH for 9–11 months.
Key takeaways
- A normal cold store keeps apples saleable for 3–4 months, while CA storage keeps them fresh for 9–11 months.
- A CA room must be gas-tight, with a half-pressure half-life of at least 30 minutes, whereas a normal cold store loses pressure in under 60 seconds.
- Nitrogen generation costs ₹18–35 lakh with a PSA generator or ₹12–22 lakh with a simpler membrane system.
- Mixed-cultivar rooms compromise the gas mix and cut maximum storage life by 6–8 weeks.
- Capex ranges from ₹80 lakh–₹1.1 crore for a 100 MT single-chamber pilot to ₹20–28 crore for a 5,000 MT integrated complex.
What CA Storage Actually Does
A normal cold storage controls one variable: temperature. CA storage controls four:
- Temperature — typically 0.5–1.5°C for apples
- Oxygen — reduced from 21% down to 1–3%
- Carbon dioxide — increased from 0.04% up to 1–5%
- Relative humidity — held at 92–95%
Reducing oxygen slows the apple's respiration almost to a standstill. A normal cold store keeps apples saleable for 3–4 months. CA keeps them farmer-fresh for 9–11 months.
Cultivar Gas Mix Requirements
| Cultivar | O₂ % | CO₂ % | Temperature |
|---|---|---|---|
| Royal Delicious | 1.5–2.0 | 1.0–1.5 | 0.5°C |
| Red Delicious | 1.5–2.5 | 1.0–2.0 | 0.5°C |
| Granny Smith | 1.5–2.0 | 0.5–1.0 | 0.5°C |
| Gala | 1.5–2.5 | 1.5–3.0 | 1.0°C |
| Fuji | 2.0–3.0 | 0.5–1.5 | 0.5°C |
| Golden Delicious | 1.5–2.5 | 2.0–3.0 | 0.5°C |
Mixed-cultivar rooms compromise gas mix and reduce maximum storage life by 6–8 weeks.
The Engineering Difference
Gas-tight construction: Half-pressure half-life of at least 30 minutes (25 mm water column dropping to 12.5 mm). Normal cold storages lose pressure in under 60 seconds. Requires sealed PUF joints, welded corner sealing, CA doors with double inflatable gaskets, sealed penetrations, and pressure relief valves.
Nitrogen generation: PSA generator (₹18–35 lakh) or membrane system (₹12–22 lakh). PSA gives purer N₂, membrane is simpler.
CO₂ scrubber: Activated carbon or lime-based. ₹8–15 lakh.
Ethylene scrubber: KMnO₄ or catalytic, ₹5–10 lakh.
Gas analyzer and SCADA: Continuous O₂/CO₂/ethylene monitoring, ₹6–12 lakh.
Capex by Facility Size
| Size | Capex |
|---|---|
| 100 MT (single chamber pilot) | ₹80 lakh – ₹1.1 crore |
| 500 MT (3–5 chambers) | ₹2.8–4.2 crore |
| 1,000 MT | ₹5–7 crore |
| 5,000 MT integrated complex | ₹20–28 crore |
ROI Math — 1,000 MT Facility
Apple harvest price (October): ₹35–50/kg. After 9 months CA storage (July): ₹90–140/kg. Premium: ₹50–90/kg.
Annual revenue on 1,000 MT: ₹5–9 crore
Storage and operating cost: ₹1.5–2.5 crore
EBITDA: ₹3.5–6.5 crore
Payback on ₹5 crore project: 18–28 months at full utilisation
With NHB subsidy (35%): effective capex drops to ₹3.25 crore. Payback: 12–18 months.
These are the numbers that make Kashmir and Himachal apple CA storage among the highest-ROI agricultural investments in India.
FAQ
Frequently asked questions
How long can apples be stored in CA storage?
9–11 months for most Indian cultivars when gas mix and temperature are correctly maintained.
What is the cost per ton of CA storage construction?
₹32,000–50,000 per MT for new construction. 60–80% more than general cold storage due to gas-tight construction and atmosphere control equipment.
Does CA storage qualify for NHB subsidy?
Yes. CA storage is eligible under NHB at 35% (50% for NE/hilly areas). The higher capex means larger absolute subsidy amounts.
Written by
HyperCold Engineering Team
Cold room and cold storage engineers at HyperCold™, a Daikin equipment partner founded in 2020 and headquartered in Sirsaganj, Firozabad (UP). We design, manufacture PUF panels for, install and maintain cold rooms across India.