Tamil Nadu Solar Calculator (2025)
Calculate Your Rooftop Solar ROI & Lifetime Savings
Get accurate payback period, savings analysis, and ROI calculations for solar installations in Tamil Nadu. Includes 2025 net metering updates, state subsidies, and TANGEDCO guidelines.
Why Solar ROI Matters in Tamil Nadu (2025)
Tamil Nadu leads India in solar adoption with over 4,000 MW of solar capacity installed. With electricity tariffs rising and new 2025 net metering policies, calculating your solar ROI has never been more important for homeowners and businesses.
High Solar Potential
Tamil Nadu receives 4.5-5.5 kWh/m²/day solar irradiance, ideal for rooftop installations.
Rising Electricity Costs
TNEB tariffs increased by 15% in 2024, making solar more attractive with 4-6 year payback.
Government Support
Up to 40% subsidy available with simplified net metering process under 2025 guidelines.
Tamil Nadu Solar ROI Calculator
Get personalized solar savings analysis based on your location, consumption, and 2025 policy updates
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Check your TNEB bill for average monthly consumption
Typical range: ₹55,000 - ₹75,000 per kW in Tamil Nadu
Your Solar Savings Report
Tamil Nadu Solar Policy Updates (2025)
Net Metering Changes
- • Simplified application process - 30 days approval
- • Bi-directional meter mandatory for systems above 5kW
- • Banking facility available for up to 1 year
- • No generation-based incentive, focus on self-consumption
Subsidy Rates 2025
- • Central subsidy: ₹18,000/kW (up to 3kW)
- • State subsidy: ₹10,000/kW additional
- • Total subsidy: Up to 40% of system cost
- • Priority for residential consumers
TANGEDCO Guidelines
- • Online application through TANGEDCO portal
- • Technical feasibility study for systems above 10kW
- • Mandatory safety equipment as per CEA standards
- • Annual maintenance certificate required
Key Dates 2025
- • New policy effective: January 1, 2025
- • Subsidy application deadline: March 31, 2025
- • Net metering cap: 30% of transformer capacity
- • RTS integration by December 2025
Solar vs Grid Electricity Cost in Tamil Nadu
Residential Tariff Comparison (2025)
TNEB vs Solar Cost per Unit (₹/kWh)
| Consumption Slab | TNEB Rate (₹/kWh) | Solar Rate (₹/kWh) | Savings (₹/kWh) | Savings % |
|---|---|---|---|---|
| 0-100 units | Free | Free* | N/A | N/A |
| 101-200 units | ₹2.25 | Free* | ₹2.25 | 100% |
| 201-500 units | ₹4.50 | Free* | ₹4.50 | 100% |
| 501+ units | ₹6.00 | Free* | ₹6.00 | 100% |
Commercial & Industrial Tariff Comparison
Higher savings for commercial consumers
| Consumer Category | TNEB Rate (₹/kWh) | Solar Rate (₹/kWh) | Annual Savings** | Payback Period |
|---|---|---|---|---|
| LT-I (Commercial) | ₹8.50 | ₹2.50 | ₹6,000/kW | 7.2 years |
| LT-II (Industries) | ₹7.50 | ₹2.50 | ₹5,000/kW | 8.7 years |
| HT-I (Industries) | ₹6.80 | ₹2.50 | ₹4,300/kW | 10.1 years |
| HT-II (Railways) | ₹7.20 | ₹2.50 | ₹4,700/kW | 9.2 years |
10-Year Cost Comparison
Grid Electricity (TNEB)
Solar + Grid Hybrid
This is just the first 10 years. Solar panels continue generating savings for 25+ years!
Best Solar Products for Tamil Nadu Homes
Handpicked solar equipment perfect for Tamil Nadu's climate and electricity needs
Luminous Solar Inverter NXG1100
- 1100VA Capacity
- Pure Sine Wave
- LCD Display
- 3 Year Warranty
Vikram Solar Panel 335W
- 335W Monocrystalline
- 21% Efficiency
- 25 Year Warranty
- Tier-1 Module
Exide Solar Battery 150Ah
- 150Ah Tubular
- Deep Cycle
- 5 Year Warranty
- Maintenance Free
Luminous MPPT Charge Controller
- 40A MPPT
- LCD Display
- Multiple Protection
- 2 Year Warranty
Solar Installation Kit Complete
- Mounting Rails
- Clamps & Bolts
- Weather Resistant
- Easy Installation
Havells Solar Water Heater 200L
- 200L Capacity
- Stainless Steel Tank
- 5 Year Warranty
- Energy Efficient
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Free Delivery
Fast delivery across Tamil Nadu
Warranty Protection
Manufacturer warranty included
Expert Support
Installation guidance available
Frequently Asked Questions
Have More Questions?
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