TNEB Electricity Bill Calculator (2026 Updated)
Accurately estimate your TANGEDCO electricity bill with the latest telescopic tariff rates. Supports domestic, commercial, and industrial unit conversions.
How TNEB Bill Calculation Works
Understanding how TNEB domestic bills are structured is crucial if you want to avoid unexpected pricing jumps. TANGEDCO (Tamil Nadu Generation and Distribution Corporation) charges domestic consumers under Tariff I-A using a **telescopic tariff structure**. This means the price you pay per unit increases as your overall consumption moves into higher brackets.
The 100-Unit Subsidy
All domestic households in Tamil Nadu receive the first 100 units completely free of cost in each billing cycle, fully subsidized by the Government of Tamil Nadu.
The 500-Unit Threshold
Crossing 500 units bi-monthly triggers a steep rate increase. The subsidy changes, and every unit consumed above the limit is billed at a higher premium rate.
Latest TNEB Tariff Slabs (Domestic Rate Charts)
Domestic energy consumption in Tamil Nadu operates under a bi-monthly reading schedule. This means readings are taken once every two months, and your bill represents 60 days of usage. Use the electricity slab rates reference guide to cross-examine rate revisions.
| Slab Classification (Bi-Monthly) | Unit Brackets | Rate per Unit (₹) |
|---|---|---|
| Consumer Tier 1 (Up to 500 Units Total) | 0 – 100 units | FREE (₹0) |
| 101 – 200 units | ₹2.35 | |
| 201 – 500 units | ₹4.70 | |
| Consumer Tier 2 (Above 500 Units Total) | 0 – 100 units | FREE (₹0) |
| 101 – 400 units | ₹4.70 | |
| 401 – 500 units | ₹6.30 | |
| Above 500 units | ₹8.40 |
Step-by-Step TNEB Bill Calculation Example
Let’s calculate the bill for a domestic household that consumes **450 units** in a bi-monthly billing period:
Since 450 units is below the 500-unit threshold, the Tier 1 slab calculations apply:
- First 100 Units: Billed at ₹0 = ₹0.00
- Next 100 Units (101-200): 100 Units × ₹2.35 = ₹235.00
- Remaining 250 Units (201-450): 250 Units × ₹4.70 = ₹1,175.00
Total Energy Charges: ₹0 + ₹235 + ₹1,175 = ₹1,410.00
Additionally, flat service parameters (fixed charges, state electricity duties, and taxes) are added to reach the final bill statement amount. For exact figures, use the automated form above.
Frequently Asked Questions
Is the first 100 units of electricity free in Tamil Nadu?
Yes, all domestic connections (Tariff I-A) in Tamil Nadu are entitled to 100 free units of electricity per bi-monthly billing cycle. This subsidy is directly credited to your account statement.
What is the “500-unit cliff” in TNEB billing?
If your consumption reaches 501 units instead of 500, your entire tariff structure switches to Tier 2. The cost for units 101-400 instantly jumps from ₹2.35 to ₹4.70 per unit, which leads to a disproportionately higher bill for just crossing the threshold by 1 unit.
How can I check my TNEB bill online?
You can check, calculate, and pay your bill on the official TANGEDCO portal or the TNEB mobile application using your unique 10-digit consumer connection number.