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Verified TNERC bi-monthly tariff schedule, 100 free units subsidy rules, slab rates, and electricity duty calculations for TANGEDCO domestic consumers.
Ref: TNERC Tariff Order No. 6 of 2025 (LT-1A Domestic) • Effective: 2025-07-01
Note: TANGEDCO bills domestic consumers once every 2 months (60 days).
Your Tamil Nadu electricity bill is managed by TANGEDCO (Tamil Nadu Generation and Distribution Corporation) and is calculated based on a unique bimonthly billing cycle. A standout feature for domestic consumers is the 100 free units scheme provided by the state government.
The Tamil Nadu Electricity Board (TNEB) was restructured into TANGEDCO (responsible for power generation and distribution) and TANTRANSCO (responsible for transmission). Whenever you pay your Tamil Nadu electricity bill, you are interacting with TANGEDCO. The tariff rates, however, are strictly regulated by the Tamil Nadu Electricity Regulatory Commission (TNERC), ensuring fair pricing for all categories of consumers across the state.
Unlike many other states in India that follow a monthly billing system, TANGEDCO predominantly employs a bimonthly billing cycle (once every two months) for most domestic consumers. This means that the meter reading is taken every 60 days. When calculating the bill, the total units consumed over the two months are divided into slabs that are effectively doubled compared to a monthly slab system.
This bimonthly system requires careful consumption management, as crossing a specific slab threshold for the combined two-month period can push your entire consumption into a higher-priced bracket. Understanding this cycle is crucial to keeping your Tamil Nadu electricity bill under control.
One of the most significant benefits for domestic consumers in Tamil Nadu is the state government's subsidy scheme, which offers the first 100 units of electricity completely free of charge, regardless of the total consumption. If your bimonthly consumption is 100 units or less, your energy charge is effectively zero (though minimal fixed charges may still apply depending on the specific connection). For consumption above 100 units, the free units are deducted, and the remaining units are billed according to the applicable telescopic slabs.
TNERC categorizes domestic consumers based on their total bimonthly consumption. The tariff structure is telescopic, meaning different rates apply to different portions of your usage. As per typical recent TNERC structures (subject to official periodic revisions), the slabs are broadly divided into categories such as consumers using up to 400 units, up to 500 units, and above 500 units bimonthly.
| Slab (Units) | Energy Charge (₹/Unit) |
|---|---|
| 0 - 100 | ₹0.00 (Fully Subsidized) |
| 101 - 200 | ₹2.25 |
| 201 - 400 | ₹4.50 |
| Slab (Units) | Energy Charge (₹/Unit) |
|---|---|
| 0 - 100 | ₹0.00 (Fully Subsidized) |
| 101 - 200 | ₹2.25 |
| 201 - 400 | ₹4.50 |
| 401 - 500 | ₹6.00 |
If your consumption exceeds 500 units in a two-month billing cycle, the subsidies for the intermediate slabs change, leading to significantly higher bills.
| Slab (Units) | Energy Charge (₹/Unit) |
|---|---|
| 0 - 100 | ₹0.00 (Fully Subsidized) |
| 101 - 400 | ₹4.50 |
| 401 - 500 | ₹6.00 |
| 501 - 600 | ₹8.00 |
| 601 - 800 | ₹9.00 |
| 801 - 1000 | ₹10.00 |
| Above 1000 | ₹11.00 |
Note: These rates are illustrative typical examples of TNERC structures. Always refer to official TANGEDCO notifications for the exact current rates.
Beyond the per-unit energy charge, your Tamil Nadu electricity bill includes fixed charges. These are typically levied on a bimonthly basis and depend on your sanctioned load and total consumption category. For instance, domestic consumers might pay zero fixed charges up to a certain consumption level, but as consumption crosses 500 units, fixed charges per kW of sanctioned load may apply. Additionally, expect to see an Electricity Duty (usually a percentage of the total energy and fixed charges) mandated by the state government.
Let's calculate the bill for a household consuming 350 units in two months.
Plus applicable fixed charges and electricity duty.
Because usage is above 500 units, the higher tariff structure applies.
This demonstrates the penalty of crossing the 500-unit threshold under TNERC rules.
To view and manage your Tamil Nadu electricity bill, you can use several convenient methods. (Please note: We are an independent informational platform, not the official portal).
For commercial establishments and industrial units, the tariff structure is distinctly different from domestic rates. These consumers are typically billed monthly. The tariffs involve higher energy charges, demand charges based on the maximum recorded demand (kVA/kW) during the month, and time-of-day (ToD) tariffs where electricity is more expensive during peak hours (e.g., morning and evening peak times) and cheaper during off-peak hours. TNERC heavily regulates these to balance industrial growth with revenue requirements for TANGEDCO.
TANGEDCO follows a bimonthly billing cycle for domestic consumers to optimize meter reading and administrative costs. Your slabs are adjusted to reflect a two-month consumption period.
Yes, for domestic consumers, the first 100 units consumed in a bimonthly cycle are completely subsidized by the state government, meaning the energy charge for those units is zero.
If you cross the 500-unit threshold, your tariff structure changes. The rates for units between 101 and 400 become significantly higher compared to someone who consumed 500 units or less. It is highly beneficial to stay below 500 units.
Your consumer number usually includes a region code (like 01 for Chennai North, etc.), followed by a section, distribution, and the actual consumer account number. You need the full number to pay online.
No, tariff rates are subject to revision by the Tamil Nadu Electricity Regulatory Commission (TNERC). Revisions can happen based on fuel surcharges or annual tariff petitions filed by TANGEDCO.