TANGEDCO / TNEB · LT-IA Domestic
Old vs New Slab Bill Calculator
Enter your bimonthly consumption to see exactly how TNEB works out your bill under the old 100-unit-free tariff and the new 200-unit-free scheme — slab by slab.
Old tariff
Pre-May 2026 slab
First 100 units free, telescopic rates after
₹0
New tariff
200-unit-free scheme
GO signed 10 May 2026, applies if bill ≤ 500 units
₹0
₹0
saved per bimonthly bill under the new scheme
How TNEB slabs actually work: TN domestic billing is telescopic — each rate applies only to the units that fall inside that band, not your whole usage. So for 350 units, you don't pay the 201–400 rate on all 350 units, only on the units from 201 to 350; the units below that are charged at their own (lower or free) band rates. This calculator shows energy charges only — your real bill may add a small fixed charge and Fuel Surcharge Adjustment (FSA), so it can differ slightly.
Which scheme applies to you: if your bimonthly consumption is 500 units or less, TANGEDCO now gives the first 200 units free (May 2026 order) instead of the earlier 100. If you cross 500 units, the bill reverts to the old structure with only 100 free units and steeper slabs above that. Rates for the 201–500 band under the new scheme are TNEB's estimated carry-over until they issue the final notified table.