Bill Calculator
Estimate your TANGEDCO electricity bill
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Use this TNEB Bill Calculator to instantly estimate your Tamil Nadu electricity bill based on the latest tariff slabs announced by TANGEDCO.
This calculator is updated as per the July 2024 tariff revision and follows the official telescopic slab system, helping domestic consumers understand why their EB bill increases when usage crosses certain limits like 400 or 500 units.
Tamil Nadu electricity bills are calculated using a slab-wise telescopic method, which means unit rates vary based on total consumption.
Here’s how this calculator works:
- Enter your total bi-monthly electricity units.
- The calculator applies the applicable tariff slabs.
- Government subsidy (100 units free) is considered where applicable.
- A clear slab-wise cost breakdown is displayed.
Note: This calculator is intended for Domestic (LT–IA) connections only.
Understanding TANGEDCO Tariff Slabs (2024–2025)
Tamil Nadu follows a telescopic tariff structure. When consumption exceeds a threshold (like 500 units), earlier units are also charged at higher rates, which often leads to bill shock.
Domestic Electricity Tariff Rates
- 0 – 100 Units: Free (Government Subsidy)
- 101 – 200 Units: ₹2.35 – ₹4.80 per unit
- 201 – 400 Units: ₹4.70 per unit
- 401 – 500 Units: ₹6.30 per unit
- 501 – 600 Units: ₹8.40 per unit
- 601 – 800 Units: ₹9.45 per unit
- 801 – 1000 Units: ₹10.50 per unit
- Above 1000 Units: ₹11.55 per unit
Important: If total usage exceeds 500 units, lower slab benefits for 101–400 units are reduced or removed.
How the 100 Units Free Electricity Subsidy Works
All domestic consumers in Tamil Nadu receive 100 units of free electricity per billing cycle.
- Usage ≤ 100 units → ₹0 bill
- Usage > 100 units → Charges apply only for excess units
This calculator focuses on energy charges only. Fixed charges and surcharges may appear on official bills.
Tips to Reduce Your TNEB Electricity Bill
- Use 5-Star rated appliances for ACs and refrigerators.
- Replace CFLs with LED bulbs.
- Try to keep bi-monthly usage below 500 units.
- Set AC temperature to 24°C for efficiency.
- Unplug devices when not in use to avoid standby power loss.
Frequently Asked Questions
Is this the official TNEB website?
No. This is an estimation tool for user convenience. Official billing is handled by TANGEDCO.
Does this include fixed charges?
No. This calculator estimates only energy charges based on units consumed.
Why does my bill increase suddenly after 500 units?
Because Tamil Nadu follows a telescopic tariff system where earlier units are re-priced at higher rates.