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Tamil Nadu Generation and Distribution Corp. • Official Website: https://www.tangedco.gov.in
Governed by TNERC Tariff Order No. 1 of 2024 (Effective 2024-07-01)
| Slab Range (kWh) | Base Energy Rate | Wheeling Charge | Total Rate / Unit |
|---|---|---|---|
| 0 - 100 units | ₹0.00/unit | ₹0.00/unit | ₹0.00/unit |
| 101 - 200 units | ₹4.50/unit | ₹0.00/unit | ₹4.50/unit |
| 201 - 500 units | ₹6.00/unit | ₹0.00/unit | ₹6.00/unit |
| 501 - Above | ₹9.00/unit | ₹0.00/unit | ₹9.00/unit |
At 250 units, your electricity costs about ₹1,055.
Electricity gets more expensive the more you use. Your first few units are cheap, but your final units are charged at a much higher rate.
Because you are in the ₹9.00/unit slab, every appliance you turn off saves you money at this highest expensive rate.
* Estimated bill based on published utility tariff filings. (Source: TNERC Tariff Order No. 1 of 2024)
See how small changes in your monthly electricity consumption impact your total bill.
Quick Answer: To calculate your TANGEDCO (TNEB) electricity bill, you need to understand that billing is done on a bimonthly (once in two months) basis. The first 100 units are entirely free for all domestic consumers. Beyond that, the tariff depends on your total consumption slab (e.g., up to 400 units, 401-500 units, or above 500 units), with rates progressively increasing for higher consumption.
Calculating your electricity bill in Tamil Nadu can sometimes feel complex due to the unique bimonthly billing cycle and the telescopic tariff structure implemented by the Tamil Nadu Generation and Distribution Corporation (TANGEDCO), formerly known as TNEB. A reliable TNEB bill calculator helps demystify these charges, enabling consumers to budget their energy expenses accurately. This guide provides an in-depth look at how your electricity charges are computed, detailing the free unit deductions, the different consumption slabs, and fixed charges.
Unlike many other states in India that bill consumers monthly, TANGEDCO follows a bimonthly (once in two months) billing cycle for domestic consumers. This means your meter is read every 60 days, and the bill generated reflects your combined consumption over this period.
While a bimonthly system reduces administrative overhead for the distribution company, it means consumers must be mindful of their consumption over a longer period. Crossing into a higher tariff slab can significantly impact the total bill amount, as the higher rates may apply retroactively to certain portions of your usage depending on the slab structure.
One of the most significant benefits for domestic electricity consumers in Tamil Nadu is the government subsidy that provides the first 100 units of electricity completely free of charge, regardless of the total consumption. Whether you consume 150 units or 1,500 units in a two-month cycle, the energy charges for the initial 100 units are always deducted from your bill. This initiative aims to provide relief to all households and ensure basic electricity needs are met without financial strain.
The TANGEDCO domestic tariff (Tariff IA) is structured telescopically. However, the rates change dramatically based on which overall bracket your total bimonthly consumption falls into. Let's break down the typical slab structures (Note: Official rates are subject to revisions by the Tamil Nadu Electricity Regulatory Commission - TNERC).
If your total consumption for the two months is 400 units or less, you fall into the lowest tariff bracket.
| Units Consumed | Energy Charge (₹/unit) |
|---|---|
| 0 - 100 units | ₹0 (Free) |
| 101 - 400 units | ₹4.50 |
If you consume between 401 and 500 units, a different set of rates applies to the units above 400.
| Units Consumed | Energy Charge (₹/unit) |
|---|---|
| 0 - 100 units | ₹0 (Free) |
| 101 - 400 units | ₹4.50 |
| 401 - 500 units | ₹6.00 |
This is where the billing math changes significantly. If your consumption crosses 500 units, you are moved to a higher tariff bracket, and the rates for units between 101 and 400 also increase compared to the lower brackets.
| Units Consumed | Energy Charge (₹/unit) |
|---|---|
| 0 - 100 units | ₹0 (Free) |
| 101 - 400 units | ₹6.00 |
| 401 - 500 units | ₹8.00 |
| 501 - 600 units | ₹9.00 |
| 601 - 800 units | ₹10.00 |
| 801 - 1000 units | ₹11.00 |
| Above 1000 units | ₹11.00+ (Rates may vary) |
In addition to the energy charges based on consumption, TANGEDCO levies a Fixed Charge (often billed per kW of connected load or as a flat rate depending on the consumer category). For domestic consumers, fixed charges are generally tiered. Lower consumption brackets might have zero or minimal fixed charges, while those consuming above 500 units might see fixed charges around ₹50 to ₹100 per billing cycle. Always refer to your physical bill for the exact fixed charge applicable to your service connection.
Let's say your bimonthly consumption is 350 units. Since this is under 400 units, you fall into the first bracket.
Your consumption is 480 units, placing you in the second bracket (401-500).
If you consume 650 units, you cross the 500-unit threshold. Notice how the rate for units 101-400 jumps from ₹4.50 to ₹6.00.
Notice the steep increase? Just 170 units more than Example 2 more than doubled the bill because crossing the 500-unit mark retroactively increased the rates for earlier units!
Given the intense summer heat in Tamil Nadu and the steep tariff hikes for higher consumption slabs, managing your electricity usage is crucial. Here are some effective strategies to keep your bimonthly consumption below the 500-unit threshold:
We are an independent informational platform and not the official TANGEDCO portal. To check your official bill or make payments, please follow these steps:
No. Since TANGEDCO bills bimonthly, the 100 free units are provided once per billing cycle (i.e., 100 free units every two months).
If you consume exactly 500 units, you are charged according to the 401-500 slab. The rate hike for the 101-400 slab only applies if you consume 501 units or more.
Your TNEB consumer number usually includes a region code, section code, distribution code, and service number. Ensure you enter the full combination when checking your bill online.
If your consumption crossed the 500-unit mark for the two-month period, the tariff structure changes, applying higher rates even to your lower consumption slabs (units 101 to 400). This "slab jump" is the most common reason for a sudden spike in TNEB bills.
Yes. TANGEDCO levies Belated Payment Surcharge (BPSC) for bills paid after the due date. It is highly recommended to pay before the due date to avoid these penalties and potential disconnection of service.
TANGEDCO is currently in the process of rolling out smart meters across Tamil Nadu in phases. Once installed, smart meters will allow consumers to track their daily usage and may eventually pave the way for monthly billing or prepaid metering systems in the future.
Regulatory Document: TNERC Retail Tariff Revision Order for TANGEDCO 2024
Source URL: https://www.tnerc.gov.in/orders/Tariff/2024/TANGEDCO_2024.pdf
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