Tamil Nadu Official Tariff: Active for 2026 (Valid till 2027) Billing Cycle: Bi-Monthly (60 Days)

TNEB Electricity Bill Calculator 2026 – TANGEDCO Bi-Monthly Tariff Estimator

Electricity billing across Tamil Nadu is administered by TANGEDCO under tariff orders issued by the Tamil Nadu Electricity Regulatory Commission (TNERC). Unlike most Indian states that bill electricity every 30 days, Tamil Nadu calculates residential bills on a 60-day bi-monthly schedule. Under the state welfare policy, domestic households (LT-IA) receive 100 free units per month, translating to 200 free units on each 60-day bill provided total consumption stays under 500 units. If bi-monthly consumption crosses 500 units, the free allowance drops to 100 units while upper units are charged at higher rates of up to ₹8.00 to ₹10.00 per unit. In addition, apartment complexes must account for the separate LT-ID tariff for common amenities like water booster pumps and elevators. This calculator models official TNERC bi-monthly slabs to show your exact charges and subsidy entitlements.

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TNERC Official Tariff Order & Validity Status Active in 2026 (Valid till 30 June 2027)

5-Year MYT Control Period (2026 Tariff Freeze)

TNERC Order No. 6 effective rates maintained under 2026 tariff freeze. Domestic 200 free units subsidy for usage <= 500 units, Commercial flat rate above 100 units.

Regulatory Commission Tamil Nadu Electricity Regulatory Commission

Order / Gazette No TNERC Suo-Motu Order No. 6 of 2025 & G.O. Ms No. 50

Effective Date 1 July 2025

Legally Valid Until 30 June 2027

Tariff Freeze & Subsidy Protection: 100 units free power for all domestic consumers + 200 units free for weavers. The annual CPI inflation tariff hike for 2026 was frozen by the government.

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Consumer Details

Instant accurate estimation

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60-Day Bi-Monthly Billing Cycle Mandatory for all TANGEDCO / TNEB LT connections

Bi-Monthly Only

Consumer Category

Connected Load (kW)

Sanctioned Connected Load (kW) Used for calculating fixed demand charges (₹/kW).

Electric Supply Phase BPL connections are legally locked to Single Phase.

Meter Reading Calculator

Previous Reading

Current Reading

Estimated Total

₹ approx.

Avg cost: •

Base Energy Charges

Fixed / Demand Charges

Government Lifeline Subsidy

📊 Slab-by-Slab Calculation Breakdown

Progressive / Flat

Slab Range	Units	Rate	Amount

Total Energy Charges

Applicable Fixed Charges & Duties:

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Official Disclaimer: This calculator provides an estimated electricity bill based on the latest tariff information available in our database. Actual bills may vary depending on taxes, subsidies, fixed charges, arrears, meter type, billing cycle, fuel adjustments, and other applicable charges.

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How to Use the TNEB / TANGEDCO Bill Calculator

Follow these simple steps to calculate your exact electricity bill in seconds.

📸 Step-by-Step Visual Walkthrough (Click image to zoom) Interactive Zoom 🔍

TNEB Bill Calculator Step 1 bi-monthly tariff selection screenshot — **Step 1: Select TNEB Bi-Monthly Tariff** Select LT-1A Domestic bi-monthly connection to verify 60-day reading cycle and 100 free units subsidy eligibility.

TNEB Bill Calculator Step 2 bi-monthly units input and slabs screenshot — **Step 2: Enter Bi-Monthly Consumption Units** Enter total 60-day power consumption in kWh to calculate progressive slabs (0-100 free, 101-200 @ ₹2.25, 201-400 @ ₹4.50).

TNEB Bill Calculator Step 3 itemized receipt with subsidy deduction screenshot — **Step 3: Review Itemized TANGEDCO Receipt** View official bi-monthly receipt with Tamil Nadu 100 free units subsidy waiver applied and net payable amount.

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Select Tariff Category

Choose LT-IA Domestic for individual households, LT-ID for apartment common facilities (lifts, stair lighting, water motors), or LT-V for commercial shops and clinics.

Enter 60-Day Bi-Monthly Consumption Units

Input total kilowatt-hours consumed across your two-month billing window. Check your previous meter reading date to ensure the reading covers the standard 60-day cycle.

Verify Subsidy Thresholds & Aadhaar Seeding

The calculator checks whether your usage remains below 500 units to credit the full 200 free units, or applies the reduced 100-unit allowance if consumption exceeds 500 units.

Review Itemized Slab Math & Total Payable

Inspect the slab-by-slab breakdown showing energy charges, fixed service charges, state government subsidies, and the final net amount payable to TANGEDCO.

⚡ Official TNERC Tariff Order No. 6 (Tariff Freeze 2026)

Understanding TANGEDCO Electricity Bill Calculation Logic

Electricity billing in Tamil Nadu is governed by the Tamil Nadu Electricity Regulatory Commission (TNERC) and implemented by TANGEDCO (formerly TNEB). Following the State Government's tariff freeze order, the revised rates effective from 1 July 2025 remain active for 2026.

1. The 60-Day Bi-Monthly Billing Cycle

Unlike most Indian states that bill monthly, TANGEDCO calculates power bills for residential and small low-tension connections once every two months (60 days). This means all official slab quotas (such as the 400-unit base slab and the 500-unit subsidy threshold) apply to two months of combined consumption, not a single month.

2. Domestic (LT-IA) Slab Rates & The Free Units Subsidy Rule

TNEB domestic billing uses a progressive telescopic structure with two separate subsidy categories based on total bi-monthly consumption:

Tier A: Consumption ≤ 500 Units 200 Free Units

If your bi-monthly usage is 500 units or less, the first 200 units are 100% free, sponsored by the Government of Tamil Nadu (saving you up to ₹990.00). Remaining units up to 400 are billed at ₹4.95/unit, and units 401–500 at ₹6.65/unit.

Tier B: Consumption > 500 Units 100 Free Units

Once your bi-monthly usage crosses 500 units, your free quota is reduced to 100 free units (saving ₹495.00). Units above 400 are charged under higher progressive slabs up to ₹12.15/unit.

Slab Range (Bi-Monthly)	Energy Rate (₹/unit)	Billing Logic & Applicability
0 – 400 units	₹4.95	Base slab. If ≤ 500u, first 200u are free (₹0). If > 500u, first 100u are free (₹0).
401 – 500 units	₹6.65	Applicable to the next 100 units consumed above 400 units.
501 – 600 units	₹8.80	Triggers when crossing 500 units; reduces free subsidy to 100 units.
601 – 800 units	₹9.95	Next 200 units billed at ₹9.95 per unit.
801 – 1,000 units	₹11.05	Next 200 units billed at ₹11.05 per unit.
1,001 units & above	₹12.15	All remaining units above 1,000 billed at the maximum slab rate.

3. Step-by-Step Worked Calculation Examples

Here is the exact arithmetic used by TANGEDCO for two common consumption scenarios:

Example A: 250 Units (Usage ≤ 500u)

Net: ₹247.50

Gross Units in Slab [0 – 400]: 250u × ₹4.95 ₹1,237.50
Less: 200 Free Units Subsidy (200u × ₹4.95) −₹990.00
Fixed Demand Charges (Waived by Govt) ₹0.00
Electricity Duty (Exempt on Domestic LT-IA) ₹0.00
Final Payable Amount ₹247.50

Example B: 550 Units (Usage > 500u)

Net: ₹2,590.00

Slab 1 [0 – 400]: 400 units × ₹4.95 ₹1,980.00
Slab 2 [401 – 500]: 100 units × ₹6.65 ₹665.00
Slab 3 [501 – 550]: 50 units × ₹8.80 ₹440.00
Gross Energy Charge (400u + 100u + 50u) ₹3,085.00
Less: 100 Free Units Subsidy (100u × ₹4.95) −₹495.00
Final Payable Amount ₹2,590.00

💡 Why Crossing 500 Units Costs So Much More:
At 500 units, your bill is ₹1,485.00 (after ₹990 subsidy). At 550 units, your bill jumps to ₹2,590.00 — an increase of ₹1,105.00 for just 50 extra units. This happens because crossing 500 units cuts your government subsidy in half (losing ₹495.00) while simultaneously charging higher rates (₹6.65 and ₹8.80) on your upper units.

4. Commercial (LT-V) & Apartment Common Facilities (LT-ID) Rules

LT-V Commercial (Shops & Offices)

Commercial connections follow a flat-rate system (non-telescopic):

Usage ≤ 100 units: All units at ₹6.65/unit.
Usage > 100 units: All units charged at ₹10.45 flat.
Fixed Demand Charge: ₹110/kW/month (₹220/kW per bi-monthly bill).
Electricity Duty: 5% on total energy charges.

LT-ID Common Facilities (Apartments)

For residential apartment common lighting, lifts, water pump motors, and security gates:

Energy Charge: Flat rate of ₹8.55 per unit for all consumption.
Fixed Demand Charge: ₹55/kW/month (₹110/kW per bi-monthly bill).
Electricity Duty: 5% on total energy charges.
Note: Individual flats remain under Domestic LT-IA.

5. How to Read Your TANGEDCO Digital Meter

Electronic static meters installed by TANGEDCO cycle through several display screens automatically:

Step 1: Find "kWh" Watch the display until the unit indicator shows kWh (Kilowatt Hours). This is your cumulative active energy consumption. Ignore screens showing V (voltage) or PF (power factor).

Step 2: Note Previous Reading Look at your previous TNEB receipt or SMS from TANGEDCO. The previous reading is printed under Previous Reading (KWH).

Step 3: Subtract & Calculate Subtract the previous reading from your current reading (Current − Previous = Units Consumed). Enter this value into our calculator.

💡 4 Practical Ways to Keep Your TNEB Bill Under 500 Units

1. Run Air Conditioners at 24°C–26°C: Setting your AC to 24°C instead of 18°C reduces compressor runtime by up to 25%, saving roughly 3–5 units per day during hot months.

2. Check Meter at Day 30: Take a mid-cycle reading on day 30. If your usage exceeds 240 units, reduce heavy appliance use in month 2 to avoid crossing the 500-unit mark.

3. Switch to BLDC Ceiling Fans: Standard induction ceiling fans draw 75W, while 5-star BLDC fans draw only 28W–32W, saving over 30 units per fan every 2-month cycle.

4. Service Water Heaters & Clean AC Filters: Clean AC filters every fortnight and descale geyser heating elements annually to avoid energy loss from clogged heat exchangers.

Frequently Asked Questions about TNEB / TANGEDCO Bill

Under TNERC domestic tariff regulations, the Tamil Nadu government subsidizes 100 units per month for domestic connections. Because TANGEDCO bills on a 60-day bi-monthly cycle, consumers whose total 60-day consumption does not exceed 500 units receive 200 units completely free of charge. If your total 60-day consumption exceeds 500 units, the subsidy is reduced: only the first 100 units are free, and all remaining units are charged across higher telescopic tariff brackets.

Crossing 500 units in a 60-day cycle triggers a double financial penalty under TNERC rules. First, you lose 100 units of free power subsidy (your free allowance drops from 200 units to 100 units). Second, consumption between 401 and 500 units shifts from ₹4.50 to ₹6.00 per unit, and every unit above 500 is billed at ₹8.00 to ₹10.00 per unit. Consequently, consuming 505 units costs significantly more than consuming 495 units, making 500 units a critical threshold for Tamil Nadu households.

TANGEDCO has historically operated on a 60-day bi-monthly cycle to manage field meter reading logistics across more than 33 million consumer connections. Reading meters every two months halved the staffing requirements for manual door-to-door assessments. As smart electronic meters with automatic remote communication are deployed across Chennai, Coimbatore, and Madurai, TANGEDCO plans to transition to standardized 30-day monthly billing cycles.

In multi-storey apartment buildings, electricity for shared amenities like stairwell lighting, lifts, perimeter security, and centralized borewell water pumps cannot be billed under domestic LT-IA rates. TNERC established a dedicated LT-ID category that charges a flat commercial-style rate (typically ₹8.00 per unit) without any free unit subsidies. Apartment resident welfare associations (RWAs) are billed under this separate tariff.

Yes. Under Tamil Nadu government directives, all domestic consumers holding LT-IA service connections must link their 10-digit consumer service number with their Aadhaar card on the official TANGEDCO consumer web portal. Seeding Aadhaar verifies that domestic connections are registered to genuine residential consumers, ensuring uninterrupted credit of the 100 free units monthly subsidy.

If a meter reading is delayed beyond 60 days due to public holidays, severe weather, or administrative scheduling, the TNERC Supply Code requires TANGEDCO to prorate the consumption slabs. The billing software calculates the average daily consumption over the extended number of days and scales up the slab boundaries proportionally (for example, expanding the 500-unit threshold to 583 units for a 70-day cycle) to ensure consumers are not penalized by bracket creep.

Related Electricity Calculators

Uttar Pradesh UPPCL Calculate Bill → Punjab PSPCL Calculate Bill → Maharashtra MSEDCL / Mahavitaran Calculate Bill → Kerala KSEB Calculate Bill →

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Tamil Nadu Generation and Distribution Corporation (TNEB / TANGEDCO)

Electricity Bill Calculation & Tariff Audit Slip

Date:

Ref:

Tariff Schedule: 2025–27 Tariff Official

Power Board (DISCOM) TNEB / TANGEDCO (Tamil Nadu)

Tariff Category

Units Consumed

Connected Load & Phase

Estimated Total Net Bill Amount

(Net Payable)

Energy Charges

Fixed Charges

Taxes & Duties

Itemized Slab-by-Slab Consumption Breakdown

Telescopic / Statutory Rates

Consumption Slab	Billed Units	Official Tariff Rate	Energy Charge

Subtotal Base Energy Charges:

Applicable Fixed Charges & Duties

Fixed / Demand Charge:

Subsidies & Final Net Total

Net Payable Amount:

Consumer / Authorized Signature Date & Verification

inbillcalculator.com Certified Audit Engine Official Computer-Generated Estimate • Validated SERC Tariff

This calculator provides an estimated electricity bill based on the latest tariff information available in our database. Actual bills may vary depending on taxes, subsidies, fixed charges, arrears, meter type, billing cycle, fuel adjustments, and other applicable charges.