TNEB bill for 800 units: ₹4,770.
The 2026 domestic charge for 800 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 800 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
- 100 free units
- Slab working
- Solar check
Your TNEB bill for 800 units
For 800 units in one two-month billing cycle, the 2026 domestic energy charge is ₹4,770. The first 100 units are free because you used more than 500 units.
| Slab | Units | Rate | Amount |
|---|---|---|---|
| 1–100 | 100 | Free | ₹0 |
| 101–400 | 300 | ₹4.70 | ₹1,410 |
| 401–500 | 100 | ₹6.30 | ₹630 |
| 501–600 | 100 | ₹8.40 | ₹840 |
| 601–800 | 200 | ₹9.45 | ₹1,890 |
| Total | 800 | ₹4,770 |
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 |
|---|---|---|
| 700 | ₹3,825 | −₹945 |
| 800 | ₹4,770 | — |
| 900 | ₹5,820 | +₹1,050 |
Would rooftop solar make sense at 800 units?
| Estimate | |
|---|---|
| Suggested system | 3.5 kW |
| Bill with solar | ₹0 |
| Saving | ₹4,770 per bill · ₹28,620 a year |
| Price after subsidy (central + Tamil Nadu) | ₹1,24,000 |
| Payback | about 4.3 years |
Strong case: about 4.3 years to pay back, then roughly 20 years of near-free power.
Work it out with your own numbers: open the TNEB bill calculator with 800 units.
Other common bills
300 units · 400 units · 500 units · 600 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 800 units?
About ₹4,770 in energy charges for 800 units in a two-month cycle under the 2026 domestic tariff, with the first 100 units free. Fixed charges are extra.
How many units are free at 800 units?
100 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 800 units per bill?
About 3.5 kW. Each kW makes about 240 units per two-month bill on a shade-free Tamil Nadu roof. Strong case: about 4.3 years to pay back, then roughly 20 years of near-free power.