TNEB unit rate 2026: 1 unit price in Tamil Nadu
Here is the electricity unit rate in Tamil Nadu on today’s TNERC tariff (order of 30 June 2025). Homes pay ₹4.70 to ₹11.55 a unit, by slab. A home that uses 100 units a month pays nothing: the tariff makes these units free. At 300 units a month the average is ₹4.80 a unit.
- ₹4.70–₹11.55 a unit
- Billed every two months
- TNEB (TNPDCL)
Rate a unit, by slab
Up to 500 units in a 2-month bill
| Units in a 2-month bill | Rate a unit |
|---|---|
| 1–200 | Free |
| 201–400 | ₹4.70 |
| 401–500 | ₹6.30 |
Above 500 units
| Units in a 2-month bill | Rate a unit |
|---|---|
| 1–100 | Free |
| 101–400 | ₹4.70 |
| 401–500 | ₹6.30 |
| 501–600 | ₹8.40 |
| 601–800 | ₹9.45 |
| 801–1000 | ₹10.50 |
| Above 1000 | ₹11.55 |
Fixed charge: None
The rate you pay after any subsidy that the tariff builds in.
Average cost a unit, with all charges
| Units a month | Bill a month | Average a unit |
|---|---|---|
| 50 (100 in a 2-month bill) | ₹0 | ₹0.00 |
| 100 (200 in a 2-month bill) | ₹0 | ₹0.00 |
| 150 (300 in a 2-month bill) | ₹235 | ₹1.57 |
| 200 (400 in a 2-month bill) | ₹470 | ₹2.35 |
| 300 (600 in a 2-month bill) | ₹1,440 | ₹4.80 |
| 500 (1000 in a 2-month bill) | ₹3,435 | ₹6.87 |
Urban home, the calculator’s default options. Electricity duty and the monthly fuel surcharge are not in these figures unless the tariff builds them in.
Slab rate and average rate
- The slab rate is the price of one more unit in that slab.
- The average a unit is the whole bill divided by the units. It includes the fixed charge and the other lines, so it is usually higher than the slab rate.
- In a small bill, the fixed charge is a bigger share. So a home that uses few units pays more for each unit on average.
- When you use more units, more of them fall in the dearer slabs. So the average goes up again.
Unit rate for shops
A shop or office on the commercial tariff pays about ₹13.75 a unit at 100 units a month and ₹11.55 a unit at 300 units, with a 3 kW load.
Unit rate in nearby states
Questions
What is the 1 unit electricity price in Tamil Nadu in 2026?
The tariff rate is ₹4.70 to ₹11.55 a unit, by slab. A 100-unit month costs nothing; a 300-unit month costs about ₹4.80 a unit with all the charges.
What is the TNEB unit rate for 200 units?
About ₹2.35 a unit on average, with all the charges our calculator adds. The bill is about ₹470 a month.
Why is my average a unit higher than the slab rate?
The average a unit is the whole bill divided by the units. It includes the fixed charge and the other lines, so it is usually higher than the slab rate. In a small bill, the fixed charge is a bigger share. So a home that uses few units pays more for each unit on average.
Source
Rates checked 15 October 2026. Your discom’s bill has the final word.