TNEB bill for 500 units: ₹1,570.
The 2026 domestic charge for 500 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 500 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 500 units
For 500 units in one two-month billing cycle, the 2026 domestic energy charge is ₹1,570. The first 200 units are free because you used 500 units or less.
| Slab | Units | Rate | Amount |
|---|---|---|---|
| 1–200 | 200 | Free | ₹0 |
| 201–400 | 200 | ₹4.70 | ₹940 |
| 401–500 | 100 | ₹6.30 | ₹630 |
| Total | 500 | ₹1,570 |
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 |
|---|---|---|
| 400 | ₹940 | −₹630 |
| 500 | ₹1,570 | — |
| 600 | ₹2,880 | +₹1,310 |
Careful at 500. At 501 units the bill jumps to ₹2,048, about ₹478 more for one extra unit, because the free units drop from 200 to 100. Keeping below 500 is worth real money.
Would rooftop solar make sense at 500 units?
| Estimate | |
|---|---|
| Suggested system | 2.5 kW |
| Bill with solar | ₹0 |
| Saving | ₹1,570 per bill · ₹9,420 a year |
| Price after subsidy (central + Tamil Nadu) | ₹87,750 |
| Payback | about 9.3 years |
Reasonable case: about 9.3 years to pay back. Worth it if you will stay in the house 10+ years.
Work it out with your own numbers: open the TNEB bill calculator with 500 units.
Other common bills
300 units · 400 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 500 units?
About ₹1,570 in energy charges for 500 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 500 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 500 units per bill?
About 2.5 kW. Each kW makes about 240 units per two-month bill on a shade-free Tamil Nadu roof. Reasonable case: about 9.3 years to pay back. Worth it if you will stay in the house 10+ years.