TNEB Bill Calculator (Tamil Nadu)

Yes. Under the Tamil Nadu state government subsidy scheme, the first 100 units of consumption in every bi-monthly billing cycle are 100% free for domestic (LT-IA) households. This benefit applies automatically on your electricity card.

TANGEDCO divides domestic consumers into two tiers. When consumption is 500 units or less, units between 101 and 200 receive a special subsidized rate of ₹2.25 per unit. The moment total consumption reaches 501 units or higher, that discount is forfeited, and all units from 101 to 400 are billed at the higher flat rate of ₹4.70 per unit. Crossing 500 units by even 5 units adds an instant ₹245 penalty across the earlier slab.

TNEB meters are read once every 60 days (bi-monthly). The tariff slabs are designed for this 60-day window. For example, the 100 free units allowance is granted for the entire 2-month period, not 100 units per individual calendar month.

Look at the cumulative kWh reading on your digital meter. Subtract the previous reading recorded on your last white card or online receipt. The remaining number is your total units consumed for the cycle. You can switch to our "Meter Reading Diff" tab above to compute this automatically.

Under recent TNERC tariff orders, domestic residential consumers (LT-IA) do not pay bi-monthly fixed capacity demand charges. A state electricity duty of 5% applies to taxable energy charges.

If you have a grid-connected rooftop solar installation with a bi-directional net meter, the units you generate and export to the grid are deducted from your gross consumption. You only pay for net imported units. If your solar generation exceeds your consumption, the surplus units roll over to your next billing cycle.