TNEB Electricity Bill Calculator (2026 Updated)
Accurately estimate your TANGEDCO electricity bill with the latest telescopic tariff rates. Supports domestic, commercial, and hidden fixed charges.
How TNEB Bill Calculation Works
Understanding how to calculate your electricity bill for the Tamil Nadu Electricity Board (TANGEDCO) can be tricky due to its Telescopic Tariff Structure. The system is designed to reward energy conservation while heavily penalizing high consumption.
The 100 Unit Gift
For all domestic consumers, the first 100 units consumed bi-monthly are absolutely free, fully subsidized by the state government.
Telescopic Penalties
As you cross thresholds (like 500 units), the subsidy on earlier slabs is withdrawn, causing retroactive price jumps on your entire bill.
Latest TNEB Tariff Slabs 2026 (Domestic)
Below is the complete 2026 unit reading calculation chart for domestic consumers billed on a bi-monthly cycle, based on the official TANGEDCO announcements. Notice how crossing 500 units changes the base rate completely.
| Total Consumption | Unit Range | Rate per Unit (₹) |
|---|---|---|
| Up to 400 Units | 0 - 100 units | FREE |
| 101 - 200 units | ₹2.35 | |
| 201 - 400 units | ₹4.70 | |
| 401 to 500 Units | 0 - 100 units | FREE |
| 101 - 400 units | As above | |
| 401 - 500 units | ₹6.30 | |
| 501 to 600 Units (Subsidy Drop!) | 0 - 100 units | FREE |
| 101 - 400 units | ₹4.70 (was ₹2.35) | |
| 401 - 500 units | ₹6.30 | |
| 501 - 600 units | ₹8.40 | |
| Above 1000 Units | For units > 1000 | ₹11.55 |
Why does the bill spike after 500 units?
If your bi-monthly consumption is 500 units, your total energy charge is exactly ₹1,805. However, if you consume just one unit more (501 units), your bill jumps drastically to ₹2,048!
Why? The eb bill calculation chart dictates that crossing 500 units removes the heavily subsidized rate for the 101-200 unit slab. Instead of paying ₹2.35 for those 100 units, you are retroactively charged ₹4.70 for them, instantly adding over ₹235 to your bill for just one extra unit of usage.
Fixed Charges & Hidden Costs
- Domestic: Currently, fixed charges for domestic consumers are generally ₹0, focusing purely on energy usage.
- Commercial: Entails heavy fixed charges (e.g., ₹100 - ₹300 per kW of contracted load bi-monthly) regardless of usage.
- Electricity Duty (ED): 5% ED is added for commercial/industrial usage. Domestic is exempted.
TNEB Online Bill Payment Guide
- Visit the official TANGEDCO Quick Pay portal.
- Enter your region code and consumer number to check bill status.
- Pay via UPI, Net Banking, or Credit/Debit Card without logging in.
- Always download the PDF receipt instantly generated upon payment for future reference.
- Important: Ensure you link your Aadhaar with TNEB to continue receiving the 100 free units subsidy.
Frequently Asked Questions
How to reduce my electricity bill?
The most effective strategy is keeping your bi-monthly consumption strictly below the 500-unit mark. Service ACs regularly, switch to LED lighting, and use heavy appliances like geysers and washing machines efficiently to avoid triggering the subsidy drop.
How does the calculator handle monthly vs bi-monthly?
The official tariff slabs are designed for a 2-month (bi-monthly) cycle. If you select "Monthly", our calculator automatically halves the slab thresholds to give you a perfectly accurate monthly breakdown based on TANGEDCO rules.
Is the first 100 units free for commercial shops?
No. The 100 free units scheme is exclusively for Domestic (Tariff I-A) and Handloom consumers. Commercial establishments (Tariff V) are billed from the very first unit and are subject to fixed charges based on contracted load.