Solar Energy in Chennai: Complete 2026 Guide
Chennai is Tamil Nadu's industrial and IT capital. TANGEDCO processed over 1.8 lakh solar net metering applications in FY 2025–26 — the highest in Tamil Nadu. With electricity tariffs charged by TANGEDCO at ₹6.50/unit and rising every year, switching to rooftop solar is now the single best financial decision a Chennai household can make in 2026.
Solar Potential: How Much Can You Generate in Chennai?
Chennai receives approximately 5.3 peak sun hours per day (based on MNRE solar radiation data for this region). This means every 1 kW of rooftop solar installed here generates about 1,606 units of electricity per year.
For a typical 3 kW system — the most popular size for a 2–3 BHK home — you can expect:
- ~13.2 units per day on average (higher in summer, lower in monsoon)
- 4,818 units per year
- ₹2,574/month savings on your TANGEDCO electricity bill
- Payback period: ~3.3 years after PM Surya Ghar subsidy
PM Surya Ghar Subsidy for Chennai Residents
Residents of Chennai in Tamil Nadu are fully eligible for the PM Surya Ghar Muft Bijli Yojana. The central government provides a Direct Benefit Transfer (DBT) subsidy directly to your bank account:
- Up to 2 kW system: ₹30,000/kW (total ₹60,000 for 2 kW)
- 2 kW to 3 kW: ₹18,000/kW for the additional capacity
- Above 3 kW: No additional central subsidy — but net metering earnings continue
- Maximum central subsidy: ₹78,000 for a 3 kW system
State subsidy note: Tamil Nadu offers a state subsidy of ₹20,000 per kW (up to 3 kW) for BPL households. General consumers receive central PM Surya Ghar only. Apply via TEDA.
Cost & Savings Table — Chennai (2026)
| System Size | Gross Cost | Subsidy | Net Cost | Annual Generation | Monthly Savings | Payback |
|---|---|---|---|---|---|---|
| 1 kW | ₹60,000 | ₹30,000 | ₹30,000 | ~1,606 units | ₹858/month | 2.9 yrs |
| 2 kW | ₹120,000 | ₹60,000 | ₹60,000 | ~3,212 units | ₹1,716/month | 2.9 yrs |
| 3 kW | ₹180,000 | ₹78,000 | ₹102,000 | ~4,818 units | ₹2,574/month | 3.3 yrs |
| 5 kW | ₹300,000 | ₹78,000 | ₹222,000 | ~8,030 units | ₹4,290/month | 4.3 yrs |
| 10 kW | ₹600,000 | ₹78,000 | ₹522,000 | ~16,060 units | ₹8,580/month | 5.1 yrs |
* Costs are indicative estimates for Chennai as of 2026. Actual prices vary by brand (Waaree, Adani, Tata, Vikram). Savings calculated at ₹6.50/unit tariff. Use our cost calculator for personalised estimates.
Your DISCOM: TANGEDCO
In Chennai, electricity distribution and net metering for rooftop solar is managed by TANGEDCO (Tamil Nadu Generation and Distribution Corporation). Here's what you need to know about solar net metering under TANGEDCO:
- Net metering limit: up to 1 MW per consumer connection
- Meter type: Bi-directional smart meter (provided and installed by TANGEDCO)
- Billing cycle: Monthly — excess units exported to grid are credited against your consumption
- Annual settlement: Any remaining credit units are carried forward; some DISCOMs pay a feed-in tariff for net annual export
- Application portal: tangedco.gov.in
Step-by-Step: How to Get Solar in Chennai
- Check your eligibility: Use our Subsidy Calculator to see the exact PM Surya Ghar amount for your home's load and Tamil Nadu location.
- Size your system: Use the Panel Requirement Calculator — enter your monthly bill in units. Most Chennai households need a 2–4 kW system.
- Register on the National Portal: Go to pmsuryaghar.gov.in, register with your Aadhaar and TANGEDCO consumer number.
- Choose an MNRE-empanelled installer from the portal's vendor list — do not use non-empanelled vendors as your subsidy will be blocked.
- Get installation done: Typical completion time in Chennai: 2–4 days for a residential system.
- Submit inspection documents to TANGEDCO for net meter installation (usually within 15–30 days).
- Receive subsidy: DBT credit directly to your bank account within 30 days of net meter commissioning.
Solar ROI Analysis for Chennai
Here's a quick back-of-envelope calculation for a typical Chennai household:
- Monthly electricity bill before solar: ~₹1,625 (250 units/month)
- 3 kW solar system generates ~396 units/month
- Monthly bill after solar: near ₹0 (net metering covers remaining consumption)
- Monthly savings: ₹2,574
- Annual savings: ₹30,888
- 25-year savings (at 5% tariff escalation): ₹811,000+
Want the exact numbers for your home? Use our Solar ROI Calculator and Solar Loan EMI Calculator if you're considering financing.
Nearby Cities Also Exploring Solar
If you found this guide useful, also check our guides for nearby cities: Coimbatore, Madurai, Tiruchirappalli — each with city-specific DISCOM, tariff, and cost data.
For state-level subsidy policy in Tamil Nadu, see our Tamil Nadu Solar Calculator.