Old Scheme vs New Scheme, Side by Side
Tamil Nadu domestic electricity is assessed on a bi-monthly (60-day) schedule. Before May 2026, the 100-free-units subsidy applied universally to all domestic connections regardless of whether total consumption was 100 units or 1,200 units. The May 2026 revision created a bifurcated structure designed to provide maximum relief to low- and middle-income families while discouraging high discretionary power demand.
| Billing Dimension | Old Scheme (Pre-10 May 2026) | New Scheme (From 10 May 2026) |
|---|---|---|
| Free Units (≤500u consumers) | 100 units (₹0.00) | 200 units (₹0.00) — Doubled |
| Free Units (>500u consumers) | 100 units (₹0.00) | 100 units (₹0.00) — Unchanged baseline |
| Slabs 101–200 Units | ₹2.35 / unit (= ₹235.00) | ₹0.00 for ≤500u users; ₹2.35 for >500u users |
| Slabs 201–400 Units | ₹4.70 / unit | ₹4.70 / unit (Carried forward, provisional) |
| Slabs 401–500 Units | ₹6.30 / unit | ₹6.30 / unit (Carried forward, provisional) |
| Legal Authorization | TN Government Domestic Subsidy Policy | TN Government Order (10 May 2026) |
| Funding Mechanism | Annual state budgetary allocation | TNERC provisional subsidy (₹1,545.14 crore) |
| Fixed Capacity Charges | ₹0.00 for LT-1A Domestic | ₹0.00 for LT-1A Domestic (Unchanged) |
| State Electricity Duty | 0.0% (Waived for LT-1A) | 0.0% (Waived for LT-1A) |
Who Actually Benefits from the May 2026 Tariff Order?
The majority of domestic consumers across Tamil Nadu record bi-monthly power consumption of 500 units or fewer over 60 days.
This demographic breakdown demonstrates the strategic focus of the 200 free units scheme:
- Urban & Rural 1-2 BHK Homes: A typical home operating ceiling fans, an LED lighting setup, a television, and a basic single-door refrigerator averages 4 to 7 units per day, or 240 to 420 units per bi-monthly cycle. Under the new policy, these households capture the maximum ₹235.00 savings on every single utility bill.
- Zero-Bill Beneficiaries (≤200 units): Households with minimal usage (rural residences, locked rental homes, elderly couples consuming under 3.3 units/day) pay nothing: an estimated ₹0.00 utility bill. Previously, consuming 200 units required a payment of ₹235.00 for units 101–200.
- High-Consumption Homes (>500 units): Homes running multiple air conditioners, immersion geysers, or induction cooktops frequently clock 600 to 1,200 units over 60 days. These consumers experience zero change in their billing: their subsidy remains fixed at the original 100 free units.
See the Difference: 4 Worked Examples
To understand how your bill is assembled, review these step-by-step mathematical breakdowns. All calculations mirror the live TNEB bill calculator.
Example 1: 200 Units (Light Household)
100% Free BillOld Bill: (100 units @ ₹0.00) + (100 units @ ₹2.35) = ₹235.00
New Bill: 200 units @ ₹0.00 (Full 200 Free Units Subsidy) = ₹0.00
You Save: ₹235.00 per billing cycle (100% reduction in payable amount).
Example 2: 300 Units (Typical 2 BHK Household)
Save ₹235Old Bill: (100u @ ₹0) + (100u @ ₹2.35 = ₹235) + (100u @ ₹4.70 = ₹470) = ₹705.00
New Bill: (200u @ ₹0.00) + (100u @ ₹4.70 = ₹470.00) = ₹470.00
You Save: ₹235.00 (Bill reduced by 33.3%).
Example 3: 500 Units (The Eligibility Ceiling)
Maximum Subsidy CapOld Bill: (100u @ ₹0) + (100u @ ₹2.35 = ₹235) + (200u @ ₹4.70 = ₹940) + (100u @ ₹6.30 = ₹630) = ₹1,805.00
New Bill: (200u @ ₹0) + (200u @ ₹4.70 = ₹940) + (100u @ ₹6.30 = ₹630) = ₹1570.00
You Save: ₹235.00 — the theoretical maximum cash benefit possible under the expanded program.
Example 4: 501 Units (The Cliff-Edge)
⚠️ Critical ThresholdBill at exactly 500 units (New Scheme): ₹1570.00
Bill at 501 units (Reverts to Baseline): Reverts to older structure with only 100 free units. The remaining 401 units are billed under applicable higher tier brackets (consult TNPDCL directly for unconfirmed rates above 500 units).
Immediate Impact: Crossing 500 units strips away 100 free units of subsidy instantly, exposing an extra 100 units to energy charges before any higher tier rates are added.
The 500-Unit Cliff-Edge: Why Managing Bi-Monthly Consumption Matters
The mathematical penalty of crossing 500 units is the single most important billing dynamic for Tamil Nadu residents to understand. Because TNEB meter assessments combine 60 days of power into one bill, small daily behavioral changes compound heavily:
Practical Household Energy Budgeting
To stay under the 500-unit ceiling, a household must maintain an average consumption of fewer than 8.33 units per day (8.33 × 60 days = 500 units). If a family consumes 8.4 units per day, their 60-day reading hits 504 units, precipitating an immediate jump as 100 free units are forfeited.
During peak summer months (April through June), running an air conditioner for even 1 extra hour per night draws approximately 1.2 to 1.5 kWh. Over 60 days, that single adjustment adds 72 to 90 units, easily pushing a 450-unit household past the 500-unit mark. Servicing your air conditioner filters, utilizing 24°C eco-modes, and unplugging idle geysers can easily preserve your 200-free-units qualification.
Why Slab Rates for 201–500 Units Remain "Provisional"
A frequent point of confusion among consumers and online calculators is the exact per-unit tariff for units 201 through 500 under the new policy (per published reports; confirm with TNPDCL):
While the Government of Tamil Nadu passed the policy order raising free units on 10 May 2026 (G.O. (Ms) No. 50 dated 10 May 2026 / TNERC Order No. 5 of 2026 (date not yet confirmed), per published reports; primary documents not yet reviewed), and TNERC formally sanctioned the corresponding subsidy disbursement (₹1,545.14 crore), the commission has not yet issued a separate, newly gazetted tariff schedule redesignating the numerical tiers between 200 and 500 units.
Regulatory Status Note:
The rates displayed in our tables (₹4.70 for 201–400 units and ₹6.30 for 401–500 units) are carried forward from the existing TNERC retail tariff baseline. TNPDCL currently bills intermediate units on these pre-existing rates after applying the 200-unit deduction. Should TNERC publish a formal schedule modifying intermediate slabs, our tool will update accordingly.
Do I Need to Apply for the New Scheme?
Per published reports, no separate application is required; confirm with TNPDCL. The enhanced subsidy is integrated directly into TNPDCL’s billing engine. When meter readers record your bi-monthly kWh consumption on their handheld terminals, the system automatically checks if the reading is ≤500 units and adjusts billing accordingly.
The service connection must be strictly designated for domestic residential occupancy (Tariff LT-1A). Operating small commercial enterprises, rental guest rooms, or home office facilities with non-domestic loads can lead to penal reassessment under Section 126 of the Electricity Act 2003.
How Tamil Nadu's Scheme Compares to Commercial Rates & Other States
It is worth contextualizing Tamil Nadu's domestic tariff against non-domestic tariffs and other state utility programs:
| State / Category | Subsidy Allowance | Eligibility Ceiling | Explore Tariffs |
|---|---|---|---|
| Tamil Nadu (Domestic LT-1A) | 200 units / bi-month | ≤500 units bi-monthly | TN State Guide → |
| Tamil Nadu (Commercial LT-V) | 0 units free | None (Starts @ ₹6.50/u + fixed fees) | Commercial Calc → |
| Karnataka (Gruha Jyothi) | Up to 200 units / month | Entitled average + 10% | Karnataka Guide → |
| Delhi (Lifeline Subsidy) | 200 units 100% free | ≤200 units (50% for 201–400) | Delhi Guide → |
To review electricity tariffs, telescopic structures, and subsidies across all 28 states and union territories, visit our national All India Electricity Tariffs Directory.
Frequently Asked Questions (Old vs New Tariff 2026)
Will the 200 free units continue after FY 2026–27? ▼
The current TNERC provisional subsidy approval of ₹1,545.14 crore covers the FY 2026–27 period (effective 10 May 2026, per published reports; primary documents not yet reviewed; G.O. (Ms) No. 50 dated 10 May 2026, TNERC Order No. 5 of 2026 (date not yet confirmed)). Any extension into FY 2027–28 and beyond will require a fresh policy notification from the Government of Tamil Nadu and subsequent regulatory approval from TNERC, which has not yet been formally announced.
Do I need to apply for the new scheme, or is it automatic? ▼
Per published reports; confirm with TNPDCL. The 200 free units benefit is applied automatically by TNPDCL's billing software during your regular bi-monthly meter assessment, provided your service connection is classified under Domestic LT-1A.
What happens if my usage varies month to month, sometimes above and sometimes below 500 units? ▼
TNEB assesses consumption independently on every individual 60-day bi-monthly billing cycle. Eligibility is not calculated as an annual or quarterly average. If your meter reading in a specific cycle is 480 units, you receive the full 200 free units for that bill. If your reading in the subsequent summer cycle rises to 520 units, that specific bill automatically reverts to the baseline 100 free units structure.
Is the 200 free units scheme available for commercial connections? ▼
No. The 200 free units subsidy applies exclusively to residential domestic meters under Tariff LT-1A. Commercial, retail, and office connections are categorized under Tariff LT-V (Commercial / Non-Domestic), where energy charges apply from the first unit without free subsidies. You can compute commercial power costs using our dedicated TNEB commercial bill calculator.
Has TNERC published final slab rates for the 201–500 unit range under the new scheme? ▼
Not yet as a separate, gazetted tariff schedule. While the Government Order dated 10 May 2026 (G.O. (Ms) No. 50 dated 10 May 2026 / TNERC Order No. 5 of 2026 (date not yet confirmed), per published reports; primary documents not yet reviewed) authorized the 200 free units benefit and secured financial provisioning, TNERC has not gazetted altered per-unit rates for the 201–500 unit span. The rates in use (₹4.70/unit for 201–400 and ₹6.30/unit for 401–500) remain carried forward from the prevailing TNERC retail tariff baseline as provisional estimates.
Calculate Your Next Electricity Bill Online
Need to test your estimated bi-monthly meter reading against the new 200 free units scheme? Use our live interactive calculator to preview progressive slab allocations, check tariff bands, and verify potential savings.