400 units electricity bill in Tamil Nadu (TNEB bill)
A home in Tamil Nadu that uses 400 units in a 2-month bill pays about ₹940 on today’s TNERC tariff (order of 30 June 2025). That is ₹2.35 a unit, with all the charges our calculator adds.
- ₹940 a bill
- ₹2.35 a unit
- TNPDCL
How the 400-unit bill adds up
| Slab (units) | Units × rate | Amount |
|---|---|---|
| 1–200 | 200 × ₹0.00 | ₹0.00 |
| 201–400 | 200 × ₹4.70 | ₹940.00 |
| Energy charge | ₹940.00 | |
| Bill | ₹940.00 | |
Urban home, default options of the Tamil Nadu calculator, 2-month bill. Source: TNERC Suo-motu Order No. 6 of 2025 - Determination of Tariff for Distribution for FY 2025-26 (CPI-linked revision under .
What changes the bill
- One more unit adds ₹6.30.
- Unit 501 adds about ₹478 on its own: the bill moves to higher rates there. Stay at 500 units or below if you can.
- At 300 units the bill is ₹470; at 500 units it is ₹1,570.
Where 400 units sit in the Tamil Nadu slabs
The 400 units cross 2 slabs. The last 200 units are in the 201–400 slab, at ₹4.70 a unit. Each extra unit in this slab costs that much.
The first 200 units cost nothing.
400 units in a 2-month bill is about 6.7 units a day, or 200 units a month. The bill is about ₹16 a day and ₹470 a month.
200 units a month in nearby states
200 units a month, priced under each tariff in the region. Tamil Nadu is number 1 of 7, from the lowest bill.
| State or UT | Bill a month | Average a unit |
|---|---|---|
| Tamil Nadu | ₹470 | ₹2.35 |
| Puducherry | ₹858 | ₹4.29 |
| Telangana | ₹930 | ₹4.65 |
| Lakshadweep | ₹935 | ₹4.67 |
| Andhra Pradesh | ₹937 | ₹4.68 |
| Kerala | ₹1,148 | ₹5.74 |
| Karnataka | ₹1,221 | ₹6.11 |
Urban home, 2 kW, the calculator’s default options, with each state’s own free-unit schemes. States that bill every two or three months are shown per month.
What this figure includes
- Rates are what the consumer pays after Government subsidy (first 200 units free up to 500 units; 100 units free above).
- Electricity tax not included: current notified rate not yet confirmed.
Other bills in Tamil Nadu
400 units in nearby states: Karnataka, Kerala, Telangana, Andhra Pradesh, Puducherry, Lakshadweep.
Questions
How much is the electricity bill for 400 units in Tamil Nadu?
About ₹940 for 400 units in a 2-month bill on the Tamil Nadu tariff, with the calculator’s default options. Your load, phase and any monthly fuel charge can change it.
What is the per unit rate for 400 units in Tamil Nadu?
The average is ₹2.35 a unit, with all charges. The last units are charged at ₹4.70 each in the tariff.
How many units a day is 400 units in a 2-month bill?
About 6.7 units a day, or 200 units a month. One unit is one kWh: a 1,000-watt load for one hour.
How do I lower a 400-unit bill?
Stay at 500 units or below: the bill jumps above that. Use the appliance calculator to find what uses the most power.