Billing Mistakes, Complaints and Official Sources
Why is my electricity bill so high suddenly? 10 causes and how to check each
Estimated readings, long billing periods, lost subsidy, fuel surcharge, wrong category, meter faults and more: how to find the cause of a sudden high electricity bill.
A sudden high electricity bill in India usually has one of a small number of causes, and most can be identified from the bill itself in a few minutes: an estimated reading followed by an actual one, a longer billing period, units pushed into higher slabs, the loss of a free-power subsidy above a threshold, a high fuel surcharge that month, arrears added from an earlier bill, a wrong tariff category, a sanctioned load penalty, a meter fault, or genuinely higher use from summer cooling or a new appliance. Check the reading status and the billing period first, then compare units with the same month last year. If the cause is an error, the complaint route is in the CGRF and Ombudsman guide.
Start with three numbers
| Look at | Normal | Warning sign |
|---|---|---|
| Reading status | Actual / normal | Average, provisional, door locked, RNA, meter defective |
| Billing period | Your usual 30 or 60 days | 45, 75, 90 days or more |
| Units versus same month last year | Within 10–20% | Double or more |
The ten common causes
1. Estimated readings catching up
If one or more bills were estimated low, the next actual reading includes all the missed units. Under slab tariffs, putting several months of units into one bill can push many of them into higher slabs. Ask for the bill to be spread over the actual months with slabs applied month by month. Many supply codes require this.
2. Long billing period
A bill covering 45 days instead of 30 contains 50% more units. If slabs were not pro-rated, more units fall into upper slabs.
3. Slab jump
Because extra units are charged at your top slab, a modest rise in use costs more than you expect. Delhi example: 380 to 450 units adds 20 × ₹4.50 + 50 × ₹6.50 = ₹415 to the energy charge, an average of ₹5.93 per extra unit. See slab tariffs explained.
4. Subsidy threshold crossed
In Delhi, crossing 400 units removes the 50% subsidy for that month; crossing 200 units moves you from full to partial subsidy. In Karnataka, crossing 200 units under Gruha Jyothi makes the full bill payable. A few units can cost hundreds of rupees. See free electricity schemes.
5. Fuel surcharge
FPPAS/PPAC changes every month. In mid-2026 Delhi's DISCOMs were allowed to recover about 17–18% for June 2026 under a DERC order of 10 August 2026, according to press reports. A percentage that high adds noticeably to the bill even if units are flat. See FPPAS explained.
6. Arrears
Unpaid amounts, a payment that was not posted, or a supplementary bill for an earlier period can appear as arrears. Match them against your receipts. A supplementary bill should come with an explanation; ask for the calculation in writing.
7. Wrong category
A home billed under a non-domestic category pays higher rates and usually no subsidy. This can happen after a name change, a change of meter or a site inspection. Ask for reclassification with proof of residential use.
8. Sanctioned load and maximum demand
If recorded maximum demand exceeds sanctioned load, some DISCOMs levy excess-demand charges or revise the load. See fixed charges and sanctioned load.
9. Meter fault or replacement
A meter that runs fast, a wrong multiplying factor, or a mix-up of meters in a building can all inflate bills. After a meter replacement, the old meter's final reading and the new meter's initial reading must be correct. See faulty meter and testing and smart prepaid meters.
10. Genuinely higher use
Summer cooling, a new AC, geyser in winter, guests, a water pump running because of a tank leak, or an old refrigerator with a failing seal. A wiring leakage test (switch everything off and watch the meter) helps separate leakage from use.
A worked diagnosis (illustrative)
A Delhi household's usual bill is about ₹650 for around 300 units a month with the subsidy. This month's bill is about ₹6,800: an energy charge of 200 × 3.00 + 200 × 4.50 + 400 × 6.50 + 160 × 7.00 = ₹5,220, plus fixed charge, surcharge and tax.
| Clue on the bill | Finding |
|---|---|
| Reading status | "Actual" this month; last two months "door locked" |
| Billing period | 30 days |
| Units | 960, the meter difference since the last actual reading three months ago |
| Previous two bills | Estimated at 150 units each, fully subsidised |
960 units over three months is about 320 a month. Two problems stand out. First, all 960 units have been charged as one month, so they climb into slabs up to ₹7.00 and lose all subsidy. Second, the 300 estimated units already billed should be adjusted against them. The household asks for the 960 units to be re-spread over the three months on actual readings, with the earlier estimated bills reversed, which would put each month at about 320 units, in the 201–400 band with 50% subsidy.
What to do next
- Photograph the meter now, showing the reading and serial number.
- Recalculate using your SERC's slabs (see electricity bill calculation worked examples).
- Complain in writing with your calculation and photos.
- Pay the undisputed part if your state allows it.
- Escalate to the CGRF if unresolved.
The bill check and dispute checklist lists each step.
See also: high per-unit rates charged by landlords and where to check tariff and surcharge rates.
Frequently asked questions
Can the DISCOM bill me for old units it missed?
Yes, units genuinely consumed can be billed, but the bill should be correct in rates and slabs. Section 56(2) of the Electricity Act limits recovery of sums that were not shown as continuously recoverable as arrears for more than two years from when they first became due; take advice if a very old amount is demanded.
My neighbour's bill is lower with similar appliances. Is my meter wrong?
Not necessarily. Usage habits, sanctioned load and subsidy status differ. If you suspect the meter, ask for a test.
Should I pay the high bill and complain later?
Paying protects against disconnection. Where your state allows, paying the undisputed part or an average amount while complaining is a reasonable middle path. Keep receipts.
Sources and where to check
- India Code — Electricity Act, 2003, Section 56
- Ministry of Power — Electricity (Rights of Consumers) Rules on billing
- Delhi Electricity Regulatory Commission — supply code and PPAC orders for Delhi
- TNPDCL — bill calculator for Tamil Nadu bi-monthly bills
