Rooftop Solar vs Group Captive: What Should Kerala Industries Choose?

If you're a Kerala factory owner evaluating renewable energy, you'll almost certainly encounter two options: rooftop solar and group captive. Both can reduce your electricity bill. But they're designed for different business profiles, different load sizes, and different financial strategies.

Here's how to think through the choice.

What Rooftop Solar Does Well

• Generates power on-site — no wheeling charges or grid complexities
• Works for smaller loads (100 kW to 5 MW+)
• Deployable quickly — typically 3–6 months from decision to commissioning
• CAPEX or OPEX options available
• Best for: Daytime power offset (9am–5pm generation profile)
• Limitation: Doesn't address evening and night-time demand
• Limitation: Constrained by available, unshaded rooftop area

What Group Captive Does Well

• Addresses large power loads (1 MW+) with economies of scale
• Wind-based captive delivers more than 3,000 hours/year — including nights
• Fixed long-term rates provide 15–25 year cost certainty
• More effective for round-the-clock industrial demand
• Best for: Factories with large, consistent demand across 16–24 hours
• Limitation: Requires equity commitment in generating company
• Limitation: Longer timeline — 18–30 months to commissioning

Side-by-Side Comparison

Can You Use Both?

Yes — and for many large Kerala industries, this is actually the optimal strategy. Rooftop solar addresses your daytime base load quickly and cost-effectively. Group captive addresses the balance of your demand at long-term fixed rates.