💡 400 Units Electricity Bill in Tamil Nadu (two months)
TANGEDCO (Tamil Nadu Generation and Distribution Corporation) - current slab rates, 2026
Bill for 400 units every two months
₹940
Average ₹2.35 per unit; your last units cost ₹4.70 each. Includes the automatic state subsidy.
Homes using up to 500 units every two months get the first 200 units free; above 500 units, the first 100 units are free. The government subsidy is already included in the bills shown here.
How the 400-unit bill adds up
| Slab (units per two months) | Units | Rate | Charge |
|---|---|---|---|
| 1-200 | 200 | Free | ₹0 |
| 201-400 | 200 | ₹4.70 | ₹940 |
| Fixed charge | ₹0 | ||
| Total (before electricity duty) | ₹940 | ||
Source: TNERC Order No. 4 of 2026 dated 27 Apr 2026 (Provisional Tariff Subsidy, FY 2026-27, LT-IA payable rates) with Order No. 5 of 2026 dated 26 May 2026 (200 free units). Last verified 2026-11-08. Estimate only; check your latest TNEB bill.
What a little more or less would cost
| Units per two months | Bill | Avg. per unit |
|---|---|---|
| 300 units | ₹470 | ₹1.57 |
| 350 units | ₹705 | ₹2.01 |
| 400 units (this page) | ₹940 | ₹2.35 |
| 450 units | ₹1,255 | ₹2.79 |
| 500 units | ₹1,570 | ₹3.14 |
Cutting back to 200 units would bring the bill down to ₹0, saving ₹940 every two months. Watch the 500-unit line: at 500 units the bill is ₹1,570, but at 501 units it becomes ₹2,048 because the extra free units stop.
Try your own units (Tamil Nadu, monthly)
TNEB / TNPDCL: TNERC Order No. 4 of 2026 dated 27 Apr 2026 (Provisional Tariff Subsidy, FY 2026-27, LT-IA payable rates) with Order No. 5 of 2026 dated 26 May 2026 (200 free units). Last verified 2026-11-08. Slabs are notified per two months; this calculator converts them to a monthly bill.
Homes using up to 500 units every two months get the first 200 units free; above 500 units, the first 100 units are free. The government subsidy is already included in the bills shown here.
Estimated Monthly Bill
₹494
200 units - Avg ₹2.47/unit
Bill breakdown
Monthly bill
₹494
Quarterly
₹1,482
Annual estimate
₹5,928
Tips to reduce your bill
- - Switch to 5-star BEE-rated appliances - they use 30-50% less electricity
- - Use LED bulbs (7W LED = 60W incandescent in brightness)
- - Set AC to 24-26 degrees C - each degree below 24 increases consumption ~6%
- - Avoid peak hours (6-10 PM) if your DISCOM has time-of-use tariffs
- - A 1kW solar rooftop panel generates ~100-120 units/month in India
Includes the automatic state subsidy for your usage level. Estimate for a domestic connection. Fuel adjustment charges, electricity duty and other state levies change often and vary by state, so your actual bill can differ. Check your DISCOM website or latest electricity bill for exact rates.
200 units a month: Tamil Nadu vs other states
| 💡 Tamil Nadu | ₹470 |
| 🏙️ Delhi | ₹640 |
| 🔆 Gujarat | ₹758 |
| ⚡ West Bengal | ₹1,249 |
| ⚡ Uttar Pradesh | ₹1,345 |
| 🔌 Karnataka | ₹1,460 |
| ☀️ Rajasthan | ₹1,488 |
| ⚡ Maharashtra | ₹1,926 |
Monthly bill for the same usage at each state's current domestic tariff, before electricity duty, fuel adjustment charges and any opt-in subsidy. 400 units every two months is about 200 units a month.
FAQs - 400 units electricity bill in Tamil Nadu
How much is the electricity bill for 400 units in Tamil Nadu?▾
Using 400 units every two months in Tamil Nadu costs about ₹940 at current TNEB rates, including the fixed charge and the state subsidy but before electricity duty.
How is the 400-unit bill calculated?▾
Slabs are charged one band at a time: 200 units at Free = ₹0, 200 units at ₹4.70 = ₹940. Then the fixed charge of ₹0 is added, for a total of ₹940.
What is the per unit cost at 400 units in Tamil Nadu?▾
At 400 units the average works out to ₹2.35 per unit including the fixed charge, while your last units are charged at ₹4.70 per unit. The average rises as usage moves into higher slabs.
How much more does it cost to use 50 more units?▾
Going from 400 to 450 units raises the bill from ₹940 to ₹1,255, an extra ₹315.
What happens if I use more than 500 units every two months?▾
Homes using up to 500 units every two months get the first 200 units free; above 500 units, the first 100 units are free. The government subsidy is already included in the bills shown here. At exactly 500 units the bill is ₹1,570; at 501 units it jumps to ₹2,048, so staying at or under 500 units saves ₹478.
Which charges are not included in this 400-unit bill?▾
Electricity duty and state taxes are not included, and neither are fuel or power purchase adjustment charges that change every quarter. Your actual bill can be somewhat higher than the figure shown here.
Is a 400-unit bill cheaper in other states?▾
For the same 200 units a month, the bill ranges from ₹470 in Tamil Nadu to ₹1,926 in Maharashtra across the states we cover, because each state sets its own slabs, fixed charges and subsidies.