Monthly Electricity Bill Savings: How Much Can Chennai Homes Save with Rooftop Solar?

Installing a rooftop solar system can significantly reduce monthly electricity bills for households in Chennai. Depending on the system capacity, sunlight availability and household consumption, homeowners can offset a substantial portion of their electricity costs.

According to Tamil Nadu`s official rooftop solar calculator, a 1 kW solar system can generate approximately 138 units per month in some districts. For this Chennai-focused estimate, we use an indicative generation rate of 118 units per kW per month and an average electricity value of ₹5.20 per unit. Actual savings depend on the applicable domestic tariff, electricity subsidies and net-metering arrangements.

Estimated Monthly and Annual Solar Savings

These are illustrative estimates, not guaranteed reductions in the electricity bill. Actual savings may be lower or higher depending on household usage patterns, tariff slabs, seasonal solar generation and electricity exported to the grid.

Which Solar System Size Is Best for Your Home?

1 kW: Suitable for smaller households with low electricity consumption.

2 kW: A practical option for homes with moderate electricity demand.

3 kW: Suitable for many family homes with refrigerators, washing machines and air conditioners.

5 kW: Best suited for larger homes with multiple air conditioners and higher electricity consumption.

Important Factors Affecting Solar Savings

Solar savings depend on more than the installed capacity. Homeowners should consider:

- Monthly electricity consumption and applicable tariff slabs.

- The amount of solar electricity consumed during daylight hours.

- Net-metering credits for surplus electricity exported to the grid.

- Seasonal changes in solar generation, particularly during the northeast monsoon.

- Roof orientation, shading and panel maintenance.

For an accurate estimate, homeowners should use the official Tamil Nadu Solar Rooftop Calculator: https://www.tnebltd.gov.in/usrp/solarcalc.xhtml and compare the projected generation with their actual electricity bills.