Industrial Rooftop Solar for Factories & Warehouses — India 2026
Indian factories and warehouses are ideal solar candidates — large flat roofs, high daytime electricity consumption, and commercial tariffs of ₹8–16/unit that make solar savings substantial.
Why Factories Are Perfect for Solar
- Large roof area = large system = large savings
- Peak production hours coincide with peak solar hours (daytime)
- Commercial tariffs (₹8–16/unit) vs solar cost (₹2–3/unit) = massive savings
- Accelerated depreciation further reduces effective cost
System Sizing for Industrial Use
| Monthly Bill | System Size | Cost | Monthly Saving |
|---|---|---|---|
| ₹1 lakh | 100–150 kW | ₹40–65 lakh | ₹70,000–85,000 |
| ₹3 lakh | 300–400 kW | ₹1.2–1.6 crore | ₹2–2.5 lakh |
| ₹5 lakh | 500–600 kW | ₹2–2.4 crore | ₹3.5–4 lakh |
| ₹10 lakh+ | 1 MW+ | ₹3.5–4.5 crore | ₹7–8 lakh |
RESCO Model — Zero Upfront Cost Option
Renewable Energy Service Company (RESCO) model:
- Solar company installs system at their own cost
- You pay per unit of solar consumed (₹4–6/unit) — still cheaper than grid
- No capital investment needed
- RESCO takes care of O&M
- After contract period (10–25 years), system transferred to you
Key Considerations for Industrial Solar
- Structural load bearing: Roof must support 15–25 kg/m² additional load — structural audit needed
- Shadow analysis: Industrial areas often have chimneys, water tanks, vents that cause shading
- Grid injection limit: Many DISCOMs cap net injection at 30–50% of contracted demand
- Open access for 1 MW+: Consider wheeling solar power from ground-mounted plant
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