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Annual savings (estimate) Bill savings
₹16607.0 217%
Annual savings (estimate) ₹16607.0
Get full estimate Plan your solar | Price & savings
Bill savings 217%
Based on: 15 kWh/day usage · 4 kW solar · 5 kWh battery · typical tariffs

Solar & Battery Savings in Tamil Nadu, India Get quotes from local installers

Design solar and battery systems for Tamil Nadu using Photonik's professional design platform. Tamil Nadu is India's second-wealthiest state with a GSDP of ₹31.55 lakh crore and has 10,571 MW of solar capacity. The state offers ₹20,000 per kW subsidy under the Chief Minister's Capital Subsidy Scheme, in addition to central subsidies.

Solar Energy Savings in Tamil Nadu

How Solar Reduces Your Electricity Bills

The calculations below show how your electricity bills change with solar.

What drives your savings in Tamil Nadu

Tamil Nadu’s steep slab tariff structure — from ₹2.35/unit for basic usage up to ₹11.55/unit above 400 units — means high-consumption households save the most from solar, as generation offsets the costliest slabs first. Solar irradiance of 5–5.5 kWh/m²/day supports strong generation, though coastal areas see reduced output during the northeast monsoon from October to December. Net metering is available through TANGEDCO, and the PM Surya Ghar central subsidy helps offset installation costs.

Your usage & system size Tamil Nadu

Energy usage & tariffs

Energy consumption patterns in Tamil Nadu reflect the state's tropical climate, with high cooling needs during hot summers and moderate usage during cooler months. The average Tamil Nadu household uses between 8-12 kWh per day, with Chennai and coastal properties typically consuming more for cooling during hot summers. Energy-efficient properties throughout Tamil Nadu often use significantly less through modern insulation, efficient cooling systems, and smart home technologies.

Before installing solar, consider reducing your energy consumption through improved insulation and energy-efficient appliances. This is particularly valuable in Tamil Nadu, where the Chief Minister's Capital Subsidy Scheme provides ₹20,000 per kW, making solar more affordable, and reducing consumption can lower required system size and improve returns.

5 kWh 100 kWh
₹ /kWh
₹ /kWh
%

lightbulb Note: These are simplified estimates. For detailed tariff inputs and advanced calculations, use the full Photonik app.

Representative flat export rate (feed-in tariff). What you earn per kWh of surplus solar exported to the grid. Your actual rate depends on your provider, plan, and time of day.

See how export rates work →

Estimated at 75% of the retail grid rate. A battery lets you store daytime solar and export during expensive peak hours, so each exported kWh is typically worth more than a flat feed-in tariff. Real returns depend on your time-of-use tariff and battery efficiency.

See how export rates work →

Solar system size

You'll need around 2.1kW of solar to match your average consumption in Tamil Nadu. We recommend sizing between 3.2kW and 4.2kW for optimal results, accounting for daily and seasonal variations. Tamil Nadu enjoys excellent solar potential, with most regions averaging 4.5-5.5 kWh/kW/day annually, with consistent generation throughout most of the year.

A 3.2 kW system in Tamil Nadu generates approximately 14.7 kWh daily on average, with seasonal variation from 4.19 kWh/kW/day in December to 4.92 kWh/kW/day in September. Tamil Nadu's excellent solar irradiance, combined with state subsidies and strong solar capacity (10,571 MW), makes solar particularly attractive for homeowners.

1 kW 20 kW

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A 4 kW system in Tamil Nadu can generate approximately 6689.0 kWh annually based on local sun conditions.

Battery storage

With solar-only (no battery), a 3.2 kW system provides approximately 50% self-usage in Tamil Nadu, depending on your consumption patterns, drawing 50% from the grid. Adding a 10 kWh battery increases energy independence to approximately 99% annually, reducing grid reliance to 1%. Battery storage is valuable in Tamil Nadu, allowing you to store excess daytime generation for evening use and providing backup power during frequent power cuts.

Net metering policies vary by distribution company in Tamil Nadu, with rates typically ranging from ₹2-6 per kWh. Battery storage is particularly valuable given frequent power cuts, providing backup power during outages. Tamil Nadu's strong solar capacity (10,571 MW) reflects the state's commitment to renewable energy. For accurate battery savings and ROI calculations specific to your location and distribution company, use the full Photonik design tool.

0 kWh 30 kWh

lightbulb A 0kWh battery will make you about 0% self sufficient.

The sweet spot for most households is 5 – 13 kWh — larger batteries add independence but with diminishing payback, especially where feed-in tariffs are low.

System Pricing & Payback for Tamil Nadu

Use the full Photonik solar planning and design platform to model a complete system for your home — including detailed costs, equipment options, and financial returns.

Try Photonik Solar Design

For a quick price guide, see the India solar calculator.

Solar Installers Chennai

Example local businesses with published addresses; not ranked by Photonik or by star ratings.

  • Daystar Solar — Chennai and Tamil Nadu
  • Heera Solar Power — Chennai metropolitan area, Tamil Nadu
  • SolarSquare — Chennai and nationwide, Tamil Nadu
  • Tata Power Solar Solutions — Tamil Nadu, India