TNEB Bill Calculator
Estimate Tamil Nadu domestic electricity bill with TANGEDCO bi-monthly slab rates and 500-unit threshold breakdown.
Rates per TNERC Order 6/2025 (effective 2025-07-01) · Last verified 2026-08-03
- Domestic LT-IA connections are billed bi-monthly (~60 days).
- Charges use telescopic slabs — each unit is priced in order from the lowest slab upward.
- At ≤500 units, the first 200 units are free; above 500, only 100 units are free.
Total Bill (Estimate)
₹0.00
Effective rate: ₹0.00/unit · 200 units
| Slab | Units | Rate (₹/unit) | Amount |
|---|---|---|---|
| 0 – 200 | 200 | Free | ₹0.00 |
| Energy Charges | ₹0.00 | ||
| Total Bill | ₹0.00 | ||
TNERC Approved Domestic Tariff (LT-IA)
Effective from 1 July 2025 — bi-monthly telescopic slabs
| Slab Range | Energy Charge |
|---|---|
| 0 – 200 | Free (≤500 tier) / Free first 100 (>500 tier) |
| 201 – 400 | ₹4.95/unit |
| 401 – 500 | ₹6.65/unit |
| 501 – 600 | ₹8.80/unit |
| 601 – 800 | ₹9.95/unit |
| 801 – 1000 | ₹11.05/unit |
| Above 1000 | ₹12.15/unit |
Tamil Nadu Government Subsidy (Effective Consumer Rates)
| Slab Range | Effective Rate |
|---|---|
| 0 – 100 (≤500 tier) | Free |
| 101 – 200 (≤500 tier) | ₹2.60/unit subsidy applied |
| 0 – 100 (>500 tier) | Free |
| 101 – 400 (>500 tier) | ₹4.95/unit |
Additional Charges
| Charge | Domestic Rate | Applies When |
|---|---|---|
| Fixed Charges (Domestic LT-IA) | ₹0 | Current domestic tariff — exempt |
| Electricity Duty | 0% | Not applicable to domestic LT-IA |
| FAC | Not applied to domestic LT-IA | Commercial connections only |
| Meter Rent | ₹0 | Domestic consumers exempt |
Worked Examples
Example A: 450 units (≤500 tier)
Total consumption is 450 units — you stay in the lower tier with 200 free units.
- 1.First 200 units: Free (200 × ₹0 = ₹0)
- 2.201–400 units (200 units): 200 × ₹4.95 = ₹990
- 3.401–450 units (50 units): 50 × ₹6.65 = ₹332.50
- 4.Energy charges: ₹990 + ₹332.50 = ₹1,322.50
Total Bill: ₹1,322.50
Example B: 550 units (>500 tier)
Crossing 500 units shifts you to Tier 2 with only 100 free units.
- 1.First 100 units: Free (100 × ₹0 = ₹0)
- 2.101–400 units (300 units): 300 × ₹4.95 = ₹1,485
- 3.401–500 units (100 units): 100 × ₹6.65 = ₹665
- 4.501–550 units (50 units): 50 × ₹8.80 = ₹440
- 5.Energy charges: ₹1,485 + ₹665 + ₹440 = ₹2,590
Total Bill: ₹2,590.00
How TNEB / TANGEDCO Calculates Domestic Bills
- •Domestic LT-IA connections are billed bi-monthly (~60 days), not monthly.
- •Charges use telescopic slabs regulated by TNERC — each unit is priced from the lowest slab upward.
- •At ≤500 units per cycle, the first 200 units are free; above 500 units, only 100 units are free and higher slabs apply to the entire consumption.
- •Crossing 500 units even by 1 unit can significantly increase your bill due to tier recalculation.
Key Billing Terms
- Energy Charges
- The cost of electricity consumed, calculated by multiplying units (kWh) by applicable slab rates.
- Fixed Charges
- A recurring charge for maintaining the distribution connection, often based on sanctioned load or a flat monthly fee.
- Telescopic Slabs
- Each unit is priced in sequence from the lowest slab upward until total consumption is covered.
- Electricity Duty
- A state government tax levied as a percentage of energy charges.
- FAC (Fuel Adjustment Charge)
- A variable surcharge to account for changes in fuel and power purchase costs.
- Meter Rent
- A fee for the electricity meter, though many domestic consumers are exempt.
- 500-Unit Threshold
- If bi-monthly consumption exceeds 500 units, the entire bill is recalculated under Tier 2 with fewer free units and additional higher slabs.
- Bi-monthly Billing
- TNEB reads meters and issues bills approximately every 60 days, not monthly.
Tips to Reduce Your Bill
- ✓Monitor consumption to stay below 500 units per bi-monthly cycle — crossing by even 1 unit triggers Tier 2 recalculation.
- ✓Replace incandescent bulbs with LED lights to cut lighting costs by up to 80%.
- ✓Set AC temperature to 24–26°C; each degree higher saves ~6% AC energy.
- ✓Unplug devices on standby — chargers and TVs draw power even when off.
- ✓Track meter readings mid-cycle to avoid surprise bill jumps.
About TNEB / TANGEDCO
The Tamil Nadu Generation and Distribution Corporation Limited (TANGEDCO), operating under TNEB, supplies electricity to millions of residential, commercial, and industrial consumers across Tamil Nadu. Tariffs are regulated by the Tamil Nadu Electricity Regulatory Commission (TNERC).
This calculator is an independent tool to estimate domestic electricity bills based on published TNERC tariff orders and Tamil Nadu government subsidy notifications. It is not affiliated with TANGEDCO.
Helpline: 1912 (national) / TANGEDCO customer care
Who Is This Calculator For?
- • Residential homeowners verifying TANGEDCO bills
- • Tenants and landlords splitting electricity costs
- • Households planning AC usage before summer
- • Anyone comparing consumption scenarios around the 500-unit threshold
About the TNEB Bill Calculator
Estimates your Tamil Nadu domestic (LT-IA) electricity bill using TANGEDCO bi-monthly telescopic slab rates. Shows slab-wise breakdown and highlights the 500-unit threshold cliff.
Use when planning household electricity costs in Tamil Nadu, comparing usage before/after AC season, or understanding why crossing 500 bi-monthly units sharply increases your bill.
At 350 units (≤500 tier): 200 free + 150 × ₹4.95 = ₹742.50. At 501 units (>500 tier): only 100 free units apply and higher slabs kick in — bill jumps from ~₹1,655 at 500 units to ~₹2,159 at 501.
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