Rooftop solar in Tamil Nadu
The short answer
A 3 kW system in Tamil Nadu costs about ₹1,74,000 before subsidy and ₹96,000 after the ₹78,000 PM Surya Ghar subsidy. Against TANGEDCO’s average of ₹5.2/unit, it saves around ₹1,841 a month and breaks even in roughly 4.3 years.
- avg tariff, ₹/unit
- ₹5.2
- avg tariff, ₹/unit
- units per kW monthly
- 118
- units per kW monthly
- max central subsidy
- ₹78,000
- max central subsidy
System prices in Tamil Nadu, after subsidy
At the live ₹58,000/kW benchmark. Your signed quote should be within about 15% of these figures — ask for the difference line by line.
| System | Before subsidy | Subsidy | Net cost | Saves/month | Payback |
|---|---|---|---|---|---|
| 1 kW | ₹58,000 | −₹30,000 | ₹28,000 | ₹614 | 4 yrs |
| 2 kW | ₹1,16,000 | −₹60,000 | ₹56,000 | ₹1,227 | 4 yrs |
| 3 kW | ₹1,74,000 | −₹78,000 | ₹96,000 | ₹1,841 | 4 yrs |
| 5 kW | ₹2,90,000 | −₹78,000 | ₹2,12,000 | ₹3,068 | 6 yrs |
| 10 kW | ₹5,80,000 | −₹78,000 | ₹5,02,000 | ₹6,136 | 7 yrs |
Savings assume the system offsets your consumption via TANGEDCO net metering.
Tamil Nadu solar FAQ
What is the solar subsidy in Tamil Nadu?
Tamil Nadu homes get the central PM Surya Ghar subsidy: ₹30,000/kW up to 2 kW, capped at ₹78,000 for 3 kW and larger systems. It is credited to your bank account after TANGEDCO commissions the system — not adjusted by the installer.
How many units does 1 kW generate in Tamil Nadu?
About 118 units a month — roughly 3.9 units a day — varying with season, orientation and shading.
Which DISCOM handles rooftop solar in Tamil Nadu?
TANGEDCO processes the net-metering application, the feasibility check and the bidirectional meter for residential systems.
Is rooftop solar worth it in Tamil Nadu?
At ₹5.2/unit and 118 units per kW monthly, households with bills above ₹2,000–3,000 usually break even in 3–5 years — then draw near-free power for the remaining 20-plus years of panel life.