How Tamil Nadu TNEB Electricity Tariff (LT-1A) is Calculated
Comprehensive reference for domestic consumers under the latest Tamil Nadu Electricity Regulatory Commission (TNERC) order.
Electricity distribution across all 38 districts of Tamil Nadu is administered by TANGEDCO (Tamil Nadu Power Distribution Corporation). Residential households fall under Low Tension Tariff 1-A (LT-1A), which uses a bi-monthly telescopic billing system. Under this system, electricity is not charged at a single flat rate; instead, consumption is divided into successive blocks (slabs), with each block billed at its designated statutory tariff.
1. The Two-Tier Subsidy Model Explained
To protect lower and middle-income families, the Government of Tamil Nadu provides direct state subsidies:
- Consumers using up to 500 units: Enjoy 200 units completely free (100 units standard subsidy + 100 units enhanced government grant). Units between 201 and 400 are billed at an effective rate of ₹4.70/unit, and units between 401 and 500 at ₹6.30/unit.
- Consumers using above 500 units: Retain the first 100 units free. Units between 101 and 400 are billed at ₹4.70/unit, 401–500 at ₹6.30/unit, 501–600 at ₹8.40/unit, 601–800 at ₹9.45/unit, 801–1000 at ₹10.50/unit, and above 1000 units at ₹11.55/unit.
2. Official Domestic Tariff Table (Bi-Monthly)
| Slab Range | Total $\le$ 500 Units | Total > 500 Units |
|---|---|---|
| 0 – 100 Units | FREE (₹0) | FREE (₹0) |
| 101 – 200 Units | FREE (₹0) | ₹4.70 / unit |
| 201 – 400 Units | ₹4.70 / unit | ₹4.70 / unit |
| 401 – 500 Units | ₹6.30 / unit | ₹6.30 / unit |
| 501 – 600 Units | N/A | ₹8.40 / unit |
| 601 – 800 Units | N/A | ₹9.45 / unit |
| > 800 Units | N/A | ₹10.50 – ₹11.55 |
Frequently Asked Questions (TNEB Bill FAQs)
How many free electricity units do domestic consumers get in Tamil Nadu?
Under the Tamil Nadu Government subsidized tariff (LT Tariff 1-A), domestic consumers whose total bi-monthly consumption is 500 units or less receive the first 200 units completely free. If consumption exceeds 500 units, the standard subsidy provides the first 100 units free of cost.
Why does my EB bill jump dramatically after crossing 500 units in Tamil Nadu?
Tamil Nadu uses a telescopic slab system with a sharp threshold at 500 units. When your consumption is 500 units, units 101 to 200 are 100% subsidized (free). When you cross into 501 units, you lose the 100-unit enhanced subsidy and enter higher marginal tariff slabs (₹8.40 and ₹9.45/unit), adding nearly ₹700 to the bill for just 1 extra unit.
How often is domestic electricity billed by TANGEDCO?
Domestic electricity in Tamil Nadu is assessed on a bi-monthly cycle (every 60 days). Meter assessors visit residential premises once every two months, record the difference between previous and current meter readings, and compute the bi-monthly telescopic bill.
Are there any fixed charges for domestic electricity connections in Tamil Nadu?
For standard LT Tariff 1-A domestic connections, the Tamil Nadu State Government absorbs 100% of the fixed/service connection charges. Residential consumers only pay for actual consumed units beyond the free subsidy threshold.
What is the official TANGEDCO Minnalagam helpline for billing or meter complaints?
For meter faults, delayed assessment, or irregular bills, citizens can dial the 24x7 Minnalagam customer care center at 1912 or register grievance updates on WhatsApp at 94987 94987.