1 Unit Electricity Cost in Tamil Nadu (May 2026 Tariff Updated)
Official May 2026 TNERC tariff rates for both Domestic (LT-1A) and Commercial (LT-V, LT-IIB, LT-IIIC) connections. Enter your consumption to find the exact cost of your next 1 unit and all-inclusive effective average unit price.
Step-by-Step Slab Unit Cost Breakdown:
| Slab Tier | Units | Cost / Unit | Total (₹) |
|---|
1 Unit Electricity Cost in Tamil Nadu 2026: Official Current Unit Price Explained
If you are searching for the verified 1 unit electricity cost in tamilnadu 2026, the exact amount depends strictly on whether your connection is domestic (residential home) or commercial, and how many units you use during TANGEDCO's 60-day bi-monthly billing cycle. There is no single flat current unit price in Tamil Nadu; instead, the Tamil Nadu Electricity Regulatory Commission (TNERC) implements a progressive telescopic slab tariff system.
Consumers frequently check their electricity meters to understand the 1 unit current price in tamilnadu. For residential households, the one unit current price in tamilnadu starts at ₹0.00 / unit for the first 100 units due to the state government's 100% free electricity subsidy. When your consumption increases, your electricity bill unit price in tamilnadu steps up into slabs of ₹4.95, ₹6.65, ₹8.85, ₹9.90, ₹10.95, and up to ₹12.05 per unit for consumption exceeding 1000 units.
For commercial establishments (shops and small offices under Tariff LT-V), there are no free units. The 1 unit current price is ₹6.65 if total consumption is within 100 units. The moment usage crosses 100 units, a strict threshold re-rating rule applies, making the base rate for all units ₹10.45 per unit, plus monthly sanctioned load demand charges (₹110/kW/month) and 5% electricity duty.
TNEB Unit Rate for House 2026: TNEB 1 Unit Price for Home & Marginal vs. Effective Cost
When analyzing the official tneb unit rate for house 2026, it is vital to distinguish between the marginal price of your next unit and your effective average electricity bill unit price in tamilnadu:
The 1 unit current price added to your bill when you turn on an additional appliance. If your household has consumed 250 units, the marginal tneb 1 unit price for home is ₹4.95. If you cross into the 401–500 slab, each subsequent unit immediately costs ₹6.65.
Your true all-inclusive electricity bill unit price in tamilnadu is your total payable bill divided by all units consumed. Because the first 100 units cost ₹0, the effective one unit current price for a home using 200 units is just ₹2.47 per unit!
- At exactly 500 units: 100 free units (₹0) + 300 units @ ₹4.95 + 100 units @ ₹6.65 = Total bill ₹2,150 (effective rate is just ₹4.30 per unit).
- At 501 units (just 1 extra unit!): 100 free units + 300 units @ ₹4.95 + 100 units @ ₹6.65 + 1 unit @ ₹8.85 = Total bill ₹2,158.85.
- Staying within 500 units keeps your tneb 1 unit price for home within the subsidized brackets and prevents jumping into high tariff rates (₹8.85 to ₹12.05).
Official TNEB / TANGEDCO 1 Unit Cost Matrix 2026 (Domestic & Commercial Slabs)
Below is the verified May 2026 TNERC tariff rate schedule detailing the 1 unit electricity cost in tamilnadu across all domestic and commercial consumption slabs:
| Category | Consumption Slab (Bi-monthly) | Base 1 Unit Cost | Fixed Charges / Duty | Applicability & Details |
|---|---|---|---|---|
| Domestic (LT-1A) | 0 - 100 Units | ₹0.00 / unit | ₹0 Fixed / 0% Duty | 100% Free Government Subsidy |
| Domestic (LT-1A) | 101 - 400 Units | ₹4.95 / unit | ₹0 Fixed / 0% Duty | Standard domestic subsidized tier |
| Domestic (LT-1A) | 401 - 500 Units | ₹6.65 / unit | ₹0 Fixed / 0% Duty | Mid-range domestic tier |
| Domestic (LT-1A) | 501 - 600 Units | ₹8.85 / unit | ₹0 Fixed / 0% Duty | High consumption (above 500 units) |
| Domestic (LT-1A) | 601 - 800 Units | ₹9.90 / unit | ₹0 Fixed / 0% Duty | Upper domestic tier |
| Domestic (LT-1A) | 801 - 1000 Units | ₹10.95 / unit | ₹0 Fixed / 0% Duty | Heavy domestic consumption |
| Domestic (LT-1A) | Above 1000 Units | ₹12.05 / unit | ₹0 Fixed / 0% Duty | Maximum residential tariff tier |
| Commercial (LT-V) | 0 - 100 Units | ₹6.65 / unit | ₹110/kW/mo + 5% Duty | Small shop / micro commercial relief |
| Commercial (LT-V) | Above 100 Units | ₹10.45 / unit | ₹110/kW/mo + 5% Duty | Applies to ALL units once > 100! |
| Institutions (LT-IIB) | All Units | ₹8.05 / unit | ₹110/kW/mo + 5% Duty | Private schools, colleges & hospitals |
| Temporary (LT-IIIC) | All Units | ₹13.25 / unit | ₹332/kW/mo + 5% Duty | Construction sites & temporary supply |
Key Features of This 1 Unit Electricity Cost Calculator
Built to give Tamil Nadu consumers complete billing transparency to calculate their exact electricity bill unit price in tamilnadu:
Instantly shows how much your next 1 unit will cost based on your current consumption level and active tariff tier.
Seamlessly toggle between Domestic LT-1A and Commercial LT-V, LT-IIB, and LT-IIIC in a single interactive dashboard.
See the exact mathematics behind every tier, including free units, unit rates, duty calculations, and net totals.
Calculates your real per-unit expenditure taking into account the 100 free units subsidy, fixed demand charges, and electricity tax.