TNEB bill for 300 units: ₹470.
The 2026 domestic charge for 300 units in one bi-monthly bill, worked slab by slab, and whether solar would pay for you.
Tamil Nadu homes are billed every two months on a telescopic slab tariff. Here is exactly what 300 units cost under the 2026 rules (200 units free up to 500 units, 100 free above), how the bill moves if you use 100 units more or less, and an honest answer on whether rooftop solar pays at this level.
- 2026 tariff
- 200 free units
- Slab working
- Solar check
Your TNEB bill for 300 units
For 300 units in one two-month billing cycle, the 2026 domestic energy charge is ₹470. The first 200 units are free because you used 500 units or less.
| Slab | Units | Rate | Amount |
|---|---|---|---|
| 1–200 | 200 | Free | ₹0 |
| 201–300 | 100 | ₹4.70 | ₹470 |
| Total | 300 | ₹470 |
Energy charge only. Fixed charges and any duty shown on your printed bill are extra.
If you use 100 units more or less
| Units per bill | Energy charge | Difference |
|---|---|---|
| 200 | ₹0 | −₹470 |
| 300 | ₹470 | — |
| 400 | ₹940 | +₹470 |
Would rooftop solar make sense at 300 units?
| Estimate | |
|---|---|
| Suggested system | 1.5 kW |
| Bill with solar | ₹0 |
| Saving | ₹470 per bill · ₹2,820 a year |
| Price after subsidy (central + Tamil Nadu) | ₹53,125 |
| Payback | about 18.8 years |
Honest answer: weak case. About 19 years to pay back, because most of your units are already free or cheap. Cut usage first, or wait until your use grows.
Work it out with your own numbers: open the TNEB bill calculator with 300 units.
Other common bills
400 units · 500 units · 600 units · 800 units · 1000 units · full 2026 tariff · cost of 1 unit
Why Goggles Energy
One engineering team from feasibility to O&M. A real engineer reviews every enquiry, sizes the system to your bill and handles the subsidy and TNPDCL (TANGEDCO) net metering. Offices in Nagercoil (HQ) and Chennai.
FAQ
What is the TNEB bill for 300 units?
About ₹470 in energy charges for 300 units in a two-month cycle under the 2026 domestic tariff, with the first 200 units free. Fixed charges are extra.
How many units are free at 300 units?
200 units. Households using 500 units or less per bill get 200 units free; above 500 units only 100 units are free (G.O. Ms No. 50, May 2026).
How much solar do I need for 300 units per bill?
About 1.5 kW. Each kW makes about 240 units per two-month bill on a shade-free Tamil Nadu roof. Honest answer: weak case. About 19 years to pay back, because most of your units are already free or cheap. Cut usage first, or wait until your use grows.