⚡ Quick Answer: Solar PPA Tariff Tamil Nadu 2026 Industrial solar PPA tariffs in Tamil Nadu currently range from ₹2.80 – ₹4.20 per unit for third-party rooftop agreements. Utility-scale ground-mounted projects see competitive bids below ₹2.50/unit. Contracts typically span 15–25 years, delivering 30–60% savings vs. grid tariffs