With the fiscal year 2025-2026 updates, the Tamil Nadu Generation and Distribution Corporation (TANGEDCO) has maintained a “telescopic” pricing model that benefits low consumers but heavily penalizes high consumption.
If you are confused by your recent bill spike, it is likely because you crossed a specific “Slab Boundary.” Here is the official breakdown of the 2026 domestic tariff rates.
The Golden Rule: The “500 Unit” Trap
The most critical thing to understand is that TNEB rates change retroactively once you cross 500 units bi-monthly.
- Scenario A (Below 500 Units): You pay a subsidized rate for the first 200 units.
- Scenario B (Above 500 Units): You lose the subsidy on earlier units, and the cost per unit jumps significantly.
Domestic Tariff Table (2026)
| Consumption Slab (Bi-Monthly) | Rate per Unit (₹) | Subsidy Status |
| 0 – 100 Units | ₹0.00 | FREE (100% Subsidized) |
| 101 – 200 Units | ₹2.35 | Partially Subsidized |
| 201 – 400 Units | ₹4.70 | Standard Rate |
| 401 – 500 Units | ₹6.30 | Peak Domestic Rate |
| 501 – 600 Units | ₹8.40 | Penalty Zone Starts |
| 601 – 800 Units | ₹9.45 | High Tension Equivalent |
| 801 – 1000 Units | ₹10.50 | Luxury Tax Slab |
| Above 1000 Units | ₹11.55 | Maximum Tariff |
Note: These rates are subject to TANGEDCO revisions. Always check your official bill for the latest fuel surcharges.
How to Stay in the “Green Zone”
To keep your bill under ₹1,500, you must keep your bi-monthly consumption strictly below 400 units. Once you hit 501 units, your bill effectively doubles.