Tamil Nadu is one of India’s leading states in renewable energy, and its residential rooftop solar market has been growing rapidly. TANGEDCO (Tamil Nadu Generation and Distribution Corporation) manages electricity distribution across the state and has established net metering provisions for residential consumers. Combined with the central PM Surya Ghar subsidy, Tamil Nadu homeowners have a meaningful opportunity to reduce electricity costs significantly.
What subsidies are available in Tamil Nadu in 2026?
Central government subsidy under PM Surya Ghar Muft Bijli Yojana
| System size | Central subsidy |
|---|---|
| Up to 2 kW | Rs 30,000 per kW (up to Rs 60,000) |
| 2 kW to 3 kW | Rs 78,000 total |
| Above 3 kW | Capped at Rs 78,000 |
TEDA and state-level support
TEDA (Tamil Nadu Energy Development Agency) is the state nodal agency for renewable energy. Tamil Nadu has historically supported rooftop solar through state-level schemes alongside the central programme. Check teda.in for any active 2026 state subsidy or incentive applicable to residential consumers.
Tamil Nadu also has a specific provision where consumers under the domestic tariff who install rooftop solar are placed in a separate solar consumer category with specific tariff treatment. Your TANGEDCO office can clarify which category applies to your connection after installation.
Note: Verify current state scheme details at teda.in before signing any installer agreement.
Understanding TANGEDCO’s role
Unlike many other states, Tamil Nadu has a single electricity distribution company, TANGEDCO, serving the entire state. This simplifies the application process considerably — there is no confusion about which DISCOM serves your area. All residential consumers in Tamil Nadu apply through TANGEDCO.
The one exception is the Chennai Metropolitan Area, where TANGEDCO has a dedicated distribution circle with slightly different processing timelines from rural areas.
Solar potential across Tamil Nadu
Tamil Nadu receives strong solar irradiance, averaging 5.0 to 5.8 kWh per square metre per day across most of the state. Interior districts like Tirunelveli, Thoothukudi, Ramanathapuram, and Virudhunagar receive particularly strong irradiance and are among the best locations for solar generation in India.
Chennai and coastal districts receive slightly lower irradiance, with higher humidity affecting panel efficiency marginally. The state’s monsoon season from October to December (northeast monsoon) reduces generation in those months, which is the opposite pattern from most of north India. Annual generation estimates from your installer should reflect this Tamil Nadu-specific seasonal pattern.
A 3 kW system in Chennai typically generates 330 to 370 units per month in peak months. In Tirunelveli or Madurai, generation can reach 380 to 430 units per month.
Who is eligible?
To claim the central PM Surya Ghar subsidy in Tamil Nadu:
- You must own a residential property with an active domestic electricity connection from TANGEDCO
- Installation must be by a vendor registered on the PM Surya Ghar national portal
- Feasibility approval must be obtained before installation begins
- The property must not have previously received a central rooftop solar subsidy
Tamil Nadu has a significant number of domestic consumers on subsidised or free electricity units (the state provides free units to consumers below a certain consumption threshold). Consumers who receive free electricity units should check with TANGEDCO how solar net metering interacts with their existing subsidy, as the calculation can differ from standard metered consumers.
How net metering works in Tamil Nadu
Net metering in Tamil Nadu is governed by the Tamil Nadu Electricity Regulatory Commission (TNERC). Under TANGEDCO’s net metering framework, surplus solar power exported to the grid is credited against your consumption.
Tamil Nadu follows a gross metering or net metering model depending on the system size and connection type. For residential consumers, net metering is the standard approach. At the annual settlement date, any remaining surplus export is compensated at a rate set by TNERC.
One specific note for Tamil Nadu consumers: TANGEDCO requires a separate energy meter for measuring solar generation in addition to the bidirectional net meter. Your installer should account for this in the installation plan.
Net meter installation timelines in Tamil Nadu have been variable. Chennai urban areas typically see installation within 4 to 8 weeks. Rural TANGEDCO circles can take longer. Proactive follow-up with your TANGEDCO section office is important.
How to apply: step-by-step
Step 1: Register on the PM Surya Ghar portal
Go to pmsuryaghar.gov.in. Register with your mobile number and TANGEDCO consumer number from your bill. Select Tamil Nadu and TANGEDCO as your DISCOM.
Step 2: Apply for feasibility approval
Submit your rooftop solar application. TANGEDCO will assess technical suitability for net-metered solar. This takes 7 to 15 working days in urban areas.
Do not commission installation before approval.
Step 3: Select a registered installer
Tamil Nadu, particularly Chennai, Coimbatore, and Madurai, has a strong registered installer market. Get at least three quotes. Installers in Coimbatore and southern Tamil Nadu cities often price competitively.
Installation takes 1 to 2 days for a standard 3 kW system.
Step 4: Net meter and generation meter installation
After installation, apply for both the bidirectional net meter and the solar generation meter through TANGEDCO. Your installer should facilitate both applications. Follow up after 4 weeks if no technician visit has occurred.
Step 5: Upload commissioning certificate and receive subsidy
Once both meters are installed and the system is commissioned, upload the certificate to the portal with your bank details. Central subsidy reaches your account within 30 to 60 days.
What does solar cost in Tamil Nadu after subsidy?
A fully installed 3 kW system in Tamil Nadu costs approximately Rs 1.4 lakh to Rs 1.85 lakh before subsidy. After the Rs 78,000 central subsidy, net cost is roughly Rs 65,000 to Rs 1.05 lakh.
Monthly savings for a Chennai household consuming 400 units are typically Rs 1,800 to Rs 2,800. Payback period is generally 4 to 6 years. In high-irradiance areas like Tirunelveli, payback can be shorter due to higher generation.
System sizing for Tamil Nadu households
| Monthly consumption | Recommended size |
|---|---|
| Below 200 units | 1 to 2 kW |
| 200 to 400 units | 2 to 3 kW |
| 400 to 600 units | 3 to 5 kW |
| Above 600 units | 5 kW and above |
Common questions
How does solar interact with Tamil Nadu’s free electricity scheme?
Tamil Nadu provides free electricity to domestic consumers below a certain monthly consumption. If your household currently receives free units, installing solar changes your net consumption pattern. TANGEDCO classifies solar consumers differently, and the interaction between free units and net metering credits should be confirmed with your TANGEDCO section office before installation.
Is the northeast monsoon a significant issue for solar generation?
Tamil Nadu’s northeast monsoon (October to December) brings considerable rainfall and cloud cover to Chennai and coastal areas. Generation drops meaningfully in these months. However, the dry season from January to September more than compensates. Factor this into your annual savings estimates rather than relying on peak-month calculations alone.
Can I install solar in a village home with a single-phase connection?
Yes. Single-phase connections are eligible for the PM Surya Ghar subsidy and TANGEDCO net metering for systems up to the sanctioned load. Most rural residential systems are 1 to 2 kW, which works well within typical rural sanctioned loads.
Summing up
Tamil Nadu’s single-DISCOM structure simplifies the application process compared to multi-DISCOM states. TEDA and TNERC have established a reasonable framework, and the installer market is well-developed in major cities. The main considerations are the northeast monsoon’s impact on generation and the interaction between solar and Tamil Nadu’s existing electricity subsidy structure for low-consumption households.
Start at pmsuryaghar.gov.in, register with your TANGEDCO consumer number, and get feasibility approval before approaching any installer.