TNERC Tariff Order (FY 2024-26) 100 Free Units Subsidy Applied

TNEB Electricity Bill Calculator (Tamil Nadu)

Calculate your exact bi-monthly electricity bill under TANGEDCO LT Tariff 1A. Features the Tamil Nadu Government 100-unit free subsidy, progressive telescopic slabs, and the 500-unit surcharge cliff jump.

Verified by State Power Tariff & Regulatory Affairs Desk

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Last Updated: October 2026 (Reflecting TNERC Domestic LT-1A Tariff Order & G.O. Ms. No. 38)

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Authority: Tamil Nadu Electricity Regulatory Commission (TNERC)

TNEB / TANGEDCO Domestic LT-1A Tariff Order (FY 2024-26)

TNEB Electricity Bill Calculator (Tamil Nadu)

Calculate bi-monthly electricity bills with the 100-unit free subsidy, telescopic slabs, and the 500-unit threshold cliff rules.

Bi-Monthly Electricity Consumption (Units / kWh)

Units

0 Units2000 Units

Enter the total units recorded on your TANGEDCO meter for the 2-month (60-day) billing cycle.

Quick Consumption Presets:

Handloom Weaver Connection

Registered residential handloom connections receive 300 free units bi-monthly instead of 100.

TN Govt 100 Units Free Subsidy Applied

Under G.O. Ms. No. 38, the Government of Tamil Nadu pays TANGEDCO directly for your first 100 units. You enjoy a 100% discount of up to ₹480 every 2 months.

Total Bi-Monthly Payable Amount

₹₹799

Effective Average Cost: ₹2.5 / unit

Free Units100 Units

Fixed Charges₹0 (Subsidized)

Bill Cost Distribution

Total Bill₹₹799

101 – 200 units

₹235(29.4%)

201 – 400 units

₹564(70.6%)

Energy Charges:₹₹799

Govt Subsidy Savings:-₹715.00

Billing Cycle:Bi-Monthly (60 Days)

Detailed TNEB Slab Breakdown (320 Units)

Category: Up to 500 Units

Consumption Slab	Units In Slab	TNERC Rate (₹/unit)	Total Slab Cost
0 – 100 units (TN Govt 100 Free Units Subsidy)	100 units	FREE	₹0.00
101 – 200 units	100 units	₹2.35	₹235.00
201 – 400 units	120 units	₹4.70	₹564.00
Total Payable Bill	320 units	Avg ₹2.5	₹₹799

TANGEDCO Domestic LT-1A Tariff at a Glance

Tamil Nadu domestic electricity (LT-1A) is billed bi-monthly (every two months). Under state welfare orders, every residential household receives the first 100 units 100% free. For bi-monthly consumption up to 500 units, units 101–200 are billed at ₹2.35/unit, 201–400 at ₹4.70/unit, and 401–500 at ₹6.30/unit. Crossing 500 units retroactively bumps the 101–200 block to ₹4.70/unit and introduces higher slabs up to ₹11.55/unit.

Mathematical Billing Formulas & Slabs (TNERC LT-1A)

The Tamil Nadu Electricity Regulatory Commission divides domestic billing into two distinct mathematical models based on whether total consumption is 500 units or less, or exceeds 500 units.

Category 1: Consumption ≤ 500 Units

Total Bill = S₁ + S₂ + S₃ + S₄

Where:

S₁ = min(U, 100) × ₹0.00 (First 100 Units Free)

S₂ = max(0, min(U - 100, 100)) × ₹2.35 (Units 101–200)

S₃ = max(0, min(U - 200, 200)) × ₹4.70 (Units 201–400)

S₄ = max(0, min(U - 400, 100)) × ₹6.30 (Units 401–500)

Fixed charges are ₹0 due to the 100% government welfare subsidy. Maximum bill at exactly 500 units is ₹1,805.

Category 2: Consumption > 500 Units

Total Bill = S₁ + S₂ + S₃ + S₄ + S₅ + S₆ + S₇

Where:

S₁ = 100 × ₹0.00 (100 Free Units Subsidy)

S₂ = 300 × ₹4.70 (Units 101–400 @ ₹4.70)

S₃ = 100 × ₹6.30 (Units 401–500 @ ₹6.30)

S₄ = min(U - 500, 100) × ₹8.40 (Units 501–600)

S₅ = min(U - 600, 200) × ₹9.45 (Units 601–800)

S₆ = min(U - 800, 200) × ₹10.50 (Units 801–1000)

S₇ = max(0, U - 1000) × ₹11.55 (Units > 1000)

The 101–200 unit slab loses its ₹2.35 concession and is charged at ₹4.70, creating the instant ₹243.40 cliff surge.

Realistic Tamil Nadu Household Worked Examples

Scenario A: 2-BHK Apartment in Chennai (350 Units)

Bi-Monthly Consumption: 350 Units (Category 1)

0 to 100 units: $100 \times ₹0.00 = ₹0.00$ (Free)
101 to 200 units: $100 \times ₹2.35 = ₹235.00$
201 to 350 units: $150 \times ₹4.70 = ₹705.00$
Fixed Charges & Meter Rent: ₹0.00 (Subsidized)
Total Payable Amount: ₹940.00

Effective rate is ₹2.69/unit. The household saved ₹715 due to state welfare subsidies.

Scenario B: 3-BHK Home in Coimbatore with AC (540 Units)

Bi-Monthly Consumption: 540 Units (Category 2 Cliff)

0 to 100 units: $100 \times ₹0.00 = ₹0.00$ (Free)
101 to 400 units: $300 \times ₹4.70 = ₹1,410.00$
401 to 500 units: $100 \times ₹6.30 = ₹630.00$
501 to 540 units: $40 \times ₹8.40 = ₹336.00$
Total Payable Amount: ₹2,376.00

Crossing 500 units added ₹243.40 in slab jump surcharge plus ₹336 for the 40 extra units.

Official TNERC LT-1A Tariff Rates Comparison

Compare how per-unit energy charges change depending on whether your bi-monthly usage stays within the 500-unit ceiling or crosses into higher tiers:

Consumption Range	$\le$ 500 Units Rate	> 500 Units Rate	State Welfare Subsidy Note
0 to 100 Units	₹0.00 (Free)	₹0.00 (Free)	100% Free under G.O. Ms. No. 38
101 to 200 Units	₹2.35	₹4.70	Subsidized only if total units $\le$ 500
201 to 400 Units	₹4.70	₹4.70	Standard domestic telescopic slab
401 to 500 Units	₹6.30	₹6.30	Upper tier before cliff transition
501 to 600 Units	N/A	₹8.40	Higher consumption tier
601 to 800 Units	N/A	₹9.45	Higher consumption tier
801 to 1,000 Units	N/A	₹10.50	Heavy residential consumption
Above 1,000 Units	N/A	₹11.55	Peak tariff rate

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For 300 units consumed in a 2-month cycle: 0–100 units are FREE (₹0), 101–200 units (100 units @ ₹2.35) = ₹235, and 201–300 units (100 units @ ₹4.70) = ₹470. Total payable bill is ₹705.

Frequently Asked Questions on Tamil Nadu Electricity Bills

Q:How is the TNEB domestic electricity bill calculated in Tamil Nadu?

In Tamil Nadu, residential consumers under LT Tariff 1A are billed bi-monthly (once every 60 days). Under state government welfare orders (G.O. Ms. No. 38), the first 100 units are 100% free for all households. For consumption up to 500 units, the remaining units are charged progressively: 101–200 units at ₹2.35/unit, 201–400 units at ₹4.70/unit, and 401–500 units at ₹6.30/unit. Domestic fixed charges are ₹0 due to the state government subsidy.

Q:Why does my TNEB electricity bill jump significantly when crossing 500 units?

When your bi-monthly consumption crosses 500 units (e.g., 501 units), TANGEDCO moves your connection into Category 2. In Category 2, the subsidised rate of ₹2.35/unit for the 101–200 unit slab is lost; instead, all units from 101 to 400 are billed at ₹4.70/unit, and higher slabs (₹8.40, ₹9.45, ₹10.50, and ₹11.55) take effect. Crossing from 500 to 501 units triggers an instant bill increase of ₹243.40 for just one extra unit.

Q:Is the 100 units free electricity scheme still active in Tamil Nadu?

Yes. The 100 units free electricity scheme introduced by the Government of Tamil Nadu remains active and universal for all domestic consumers across the state. Even if your bi-monthly consumption exceeds 500 units, your first 100 units remain completely free (saving up to ₹480 every cycle).

Q:What are the fixed charges and meter rent for domestic TNEB connections?

Under the revised TNERC tariff orders, the Government of Tamil Nadu fully subsidizes fixed charges for LT-1A domestic consumers. Therefore, residential domestic consumers pay ₹0 in fixed charges and ₹0 in meter rent on their bi-monthly electricity bills.

Q:What is the handloom weaver concession under TNEB LT-1A?

Handloom weavers utilizing their domestic connection for handloom weaving receive 300 free units bi-monthly (instead of the standard 100 units) under the special state government welfare subsidy scheme.