Checked 22 Oct 2026
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Why is my TNEB bill so high?
Your TNEB bill is usually high for one of three reasons. You crossed 500 units in two months, which adds ₹470 on its own because only 100 units stay free instead of 200. Your meter was read late, so more days were billed at the higher slabs. Or summer cooling raised your use. Put in your last two bills to see which.
Count the days between the two reading dates on your meter card or bill.
Last bill, 480 units₹1,444
This bill, 620 units₹3,069
This bill is ₹1,625 more for 140 more units. You crossed 500 units, so only the first 100 units stayed free instead of 200. That alone costs ₹470; the rest is the extra units themselves, and those above 500 cost ₹8.40 or more each.
In short
- Crossing 500 units in a two-month bill costs ₹470 on its own, because only 100 units stay free instead of 200. At 500 units a home pays ₹1,570; at 501, ₹2,048.40.
- A meter read 8 days late can turn a ₹1,255 bill into ₹2,124. We found no TNERC rule that adjusts the slabs for a longer period.
- Wrong readings and faulty meters are rarer: in TNPDCL's own July 2026 recheck, 100 of the first 15,323 connections had a problem.
- Complain before the due date (Minnagam, 94987 94987), keep dated photos of your meter, and ask for a meter test if the numbers don't add up.
1. You crossed 500 units
This is the biggest jump, and one of the most common. Up to 500 units in a two-month bill, the first 200 units are free. Above 500, only the first 100 are, so units 101 to 200 start costing ₹4.70 each: ₹470 more before you count a single extra unit. Every unit above 500 then costs ₹8.40 or more.
| Units | Bill | More than 480 units |
|---|---|---|
| 480 | ₹1,444 | ₹0 |
| 500 | ₹1,570 | ₹126 |
| 501 | ₹2,048.40 | ₹604.40 |
| 520 | ₹2,208 | ₹764 |
| 550 | ₹2,460 | ₹1,016 |
| 600 | ₹2,880 | ₹1,436 |
So a home that used 480 units last time and 520 this time used 40 more units and pays ₹764 more. The TNEB bill calculator shows your exact bill and how far you are from the line.
2. The meter was read late
The slabs are set for a two-month bill, and the bill covers whatever period falls between two readings. The Supply Code says the meter must be read at least once in every billing cycle (TN Electricity Supply Code amendment, 2 Sep 2023, Reg 8(3)), so a reading well past the due date is something you can complain about. We found no TNERC rule that adjusts the slabs when that period runs longer than 60 days. The board's own calculator only says to choose the monthly option if the cycle is shorter than 35 days (TNPDCL bill calculator).
That makes the date of the reading matter. A home that uses 450 units every 60 days pays ₹1,255. If the assessor comes 8 days late, the same daily use adds up to 510 units, and the bill becomes ₹2,124: ₹869 more for 8 days.
Late readings are a known problem this year. In September 2026 TNPDCL told staff that readings were being taken beyond the billing cycle and moved to outsource meter reading, with most meter reader posts vacant (DT Next, 26 Sep 2026). Check the two reading dates on your meter card or bill; the tool above shows what the extra days cost.
3. Summer use
An appliance uses its rated watts times the hours it runs. Units = watts × hours a day × days ÷ 1,000. A 1,500-watt appliance running 6 hours a day for a 60-day bill uses 540 units on its own. The watts are printed on the appliance's label; an AC's actual use is often lower than its rating once the room is cool.
In July 2026 TNPDCL ordered staff to physically recheck 3.7 lakh domestic connections whose use jumped between the May and July bills, and named hot, humid weather as the reason for the rise (DT Next, 29 Jul 2026). In the first 15,323 connections checked, 100 had a problem (DT Next, 1 Aug 2026): in that early sample, fewer than 1 in 100 bills had an error.
4. The meter was not read
If the assessor cannot reach your meter, for example a locked gate, the Supply Code lets the board charge a provisional amount based on your previous bill (TN Electricity Supply Code, consolidated to 2009, Reg 10). The next real reading then covers all the units since the last real one. If that period was long, it can push you over 500.
Since 2023 the board may let you send a photo of the meter display from your registered mobile number or email when it cannot read the meter itself (TN Electricity Supply Code amendment, 2 Sep 2023, Reg 10(6)). If you will be away at reading time, ask your section office first whether they will accept one.
5. A wrong reading
Look at the kWh reading on your meter display today. It should be at least the "current reading" on your bill. If the bill shows a higher reading than your meter does now, the bill is wrong.
For the September and October 2026 bills, TNPDCL's billing system holds back the bill of a home that went above 500 units in the July or August bill if the new bill is 20% or more higher than the last, until the reading is checked again within three working days (DT Next, 6 Sep 2026). Outside that window, check the reading yourself.
6. A faulty meter
You can ask your section office to test the meter. The Supply Code says the test must be done within 30 days; who pays depends on the result; and you can ask for a retest at an accredited laboratory, whose result is final. If the meter was recording too much, the bill must be revised for the period of the fault, and the excess comes back as an adjustment (TN Electricity Supply Code amendment, 2 Sep 2023, Reg 7(9) and 7(10)).
7. Something besides your units
Read the lines under the energy charge. Old arrears, adjustments and a penalty for late payment all appear as separate lines and are added to what you pay. Homes pay no fixed charge in Tamil Nadu (TNERC Tariff Order No. 6 of 2025, 30 Jun 2025, page 34). What each line on a TNEB bill means.
What people are reporting, and what it usually means
We read the posts and comments people shared on Instagram about TNEB bills between July and October 2026, and the YouTube videos with the most views. Five stories come up again and again. Here is what each one usually means, and what you can do.
It was always about ₹3,000. This time it is ₹9,000.
The story we saw most often. When the jump is two or three times, check two things first: did you cross 500 units (that is ₹470 on its own), and how many days does this bill cover? A late reading on top of summer use can do this without any fault. If neither explains it, ask for a meter check.
They said our earlier readings were wrong, so this bill catches up.
A household shared a bill of about ₹17,000 after years of bills under ₹4,000; the board said the meter was fine but earlier readings had been recorded too low, and offered instalments. When missed units are billed in one go, they all land in one two-month bill, and most of them fall in the dearest slabs. Ask for the calculation in writing: which readings, which dates. The Electricity Act, 2003 also limits recovery to two years from when an amount first became due, unless it was shown as arrears all along (Electricity Act, 2003, section 56, section 56(2)).
I kept photos of my meter, so they could not argue.
One commenter photographed the meter display every two weeks for three months, with the date on each photo. When the next bill came in high, the record showed the meter was at fault, and the meter was replaced. This is the single most useful habit we saw. It also tells you, halfway through a bill, whether you are heading past 500.
I bought a check meter to prove it.
Plug-in and DIN-rail energy monitors are being sold through reels as a way to catch a faulty board meter. The seller of one popular device says it is accurate to plus or minus 5% and should be installed by an electrician. Treat it as a guide only: what counts in a dispute is a test of the board's meter under the Supply Code, done within 30 days of your request (TN Electricity Supply Code amendment, 2 Sep 2023, Reg 7(9)).
Two houses, the same appliances, very different readings.
Tenants in shared buildings often find that the next portion uses as much but pays far less. Before suspecting the meter, confirm which meter is yours: meters in one box can get mixed up, in the wiring or on paper. Switch off your main switch and see which meter display stops counting.
These are composites of what people posted, summarised in our words. We have not named anyone. Outcomes people report, such as a refund after a complaint to the Chief Minister's grievance cell, are their own accounts and not something we could check.
How to complain about a high TNEB bill
- Check the reading. Compare the reading on your bill with your meter display, and the two reading dates.
- Start a reading diary. Photograph the meter display every two weeks, with the date showing. It is your evidence if the next bill is wrong, and it warns you before you cross 500.
- Check the maths. Put the units in the TNEB bill calculator (also in Tamil). If the energy charge matches, the bill is right for the units it shows.
- Complain before the due date. Call or WhatsApp Minnagam on 94987 94987, or visit your section office with the bill and a photo of the meter. Complaints made before the due date are to be resolved before the next bill, with any refund adjusted. The charter says you cannot hold back part of the bill because you think it is wrong (TNPDCL Citizen Charter, 4.6). If you are disputing it, the Electricity Act, 2003 (section 56) says supply cannot be cut if you pay, under protest, the billed amount or your average monthly charge over the last six months, whichever is less (Electricity Act, 2003, section 56).
- Escalate. Use the TNPDCL complaints portal. If it is still unresolved, file with the Consumer Grievance Redressal Forum, which must decide within 30 to 45 days, and appeal to the Electricity Ombudsman within 30 days of its order (TNERC Consumer Grievance Redressal Forum and Ombudsman Regulations, consolidated to 31 Mar 2024).
How to reduce your next TNEB bill
For most homes in Tamil Nadu the single biggest saving is staying at 500 units or under in each two-month bill. Read the meter halfway through the cycle: subtract the reading on your last bill. If you are past 250 units at the halfway mark, you are on course to cross 500, and cutting the biggest appliance by an hour a day is usually the quickest saving.
Questions people ask
Why is my EB bill high in Tamil Nadu this month?
Often because the two-month total went past 500 units, which takes away 100 of the 200 free units and adds ₹470 on its own. Other usual causes are a reading taken later than usual, so more days are counted, and summer use of ACs and fans. Wrong readings and faulty meters happen too; in TNPDCL's own recheck this year, fewer than 1 in 100 of the first bills checked had an error.
How much does the bill go up after 500 units?
At 500 units a home pays ₹1,570; at 501 units, ₹2,048.40. That one unit adds ₹478.40: ₹470 for the 100 units that stop being free and ₹8.40 for the unit itself.
Can I refuse to pay a bill I think is wrong?
Not on your own say-so. The TNPDCL Citizen Charter says a consumer shall not withhold any part of the bill on the plea that it is wrong; complain before the due date and the complaint is to be resolved before the next bill, with any excess adjusted (TNPDCL Citizen Charter, 4.6). While a dispute is pending, section 56 of the Electricity Act, 2003 protects your supply if you pay, under protest, the billed amount or your average monthly charge over the last six months, whichever is less (Electricity Act, 2003, section 56).
How do I complain about a high TNEB bill?
Call or WhatsApp Minnagam on 94987 94987, or go to your section office with the bill and a photo of the meter display. If that does not settle it, use the online complaints portal, and after that the Consumer Grievance Redressal Forum. The steps are in the section above.
How do I get my meter tested?
Apply to your section office. Under the Supply Code the test must be done within 30 days, and who pays for it depends on the result. If you disagree with the result you can ask for a retest at an accredited (NABL) laboratory, whose result is final. (TN Electricity Supply Code amendment, 2 Sep 2023, Reg 7(9))
Is a 200 unit electricity bill free in Tamil Nadu?
Yes, for a home that uses 200 units or less in a two-month bill: all of it is free. In fact the first 200 units are free for any home using up to 500 units in two months, since 10 May 2026.
What is the EB bill rate per unit in Tamil Nadu?
Up to 500 units in two months: 1 to 200 free, 201 to 400 at ₹4.70, 401 to 500 at ₹6.30. Above 500, only the first 100 are free and the rates rise to ₹8.40, ₹9.45, ₹10.50 and ₹11.55. The full table is on the TNEB bill calculator page.
Sources
- TNERC Order No. 4 of 2026, 27 Apr 2026 and TNERC Order No. 5 of 2026, 26 May 2026: the rates households pay.
- TN Electricity Supply Code amendment, 2 Sep 2023. Meter read once every billing cycle (Reg 8(3)); meter test on request within 30 days (Reg 7(9)); bill revised for a faulty meter (Reg 7(10)); consumer photo of the meter accepted (Reg 10(6)).
- TN Electricity Supply Code, consolidated to 2009. Meter not accessible: provisional bill on the previous assessment (Reg 10).
- Electricity Act, 2003, section 56. Supply not cut while a dispute is pending if you pay under protest.
- TNPDCL Citizen Charter. Billing complaints before the due date resolved before the next bill (4.6).
- TNERC Consumer Grievance Redressal Forum and Ombudsman Regulations, consolidated to 31 Mar 2024. Forum decides within 30 to 45 days; appeal to the Ombudsman within 30 days.
- TNPDCL bill calculator, checked 22 Oct 2026.
- News reports: DT Next, 29 Jul 2026, DT Next, 1 Aug 2026, DT Next, 6 Sep 2026, DT Next, 26 Sep 2026.
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