An estimated bill is not an unlimited figure. Check that the account is unmetered or legitimately unread, identify the feeder and customer class, then compare the energy billed with the applicable regulatory cap.
NERC says unmetered customers should be billed using the approved estimated-billing methodology and should not be billed above the applicable energy cap. State regulators now handle primary oversight in transitioned states.
The essentials
- Whether the bill marks the reading as estimated.
- The feeder name, tariff band and customer class.
- The kWh billed—not only the naira total.
- Earlier bills, payments and any meter application records.
What to check first
Start with the evidence already in front of you. A precise account, meter, product or safety detail is more useful than guessing from the outcome alone.
- Whether the bill marks the reading as estimated.
- The feeder name, tariff band and customer class.
- The kWh billed—not only the naira total.
- Earlier bills, payments and any meter application records.
Step by step
Work through the existing transaction, account or installation in order. Keep the reference and result from each step before moving to the next.
- Obtain the full bill and identify the billing period.
- Find the cap or applicable methodology for the feeder and class.
- Write to the DisCo with your comparison and requested adjustment.
- Keep the acknowledgement and escalate if the complaint is unresolved.
Mistakes to avoid
These shortcuts often turn a traceable problem into a second payment, a lost evidence trail or a safety risk.
- Relying only on a social-media post as proof of the applicable cap.
- Deleting bills or receipts after paying.
- Tampering with the connection because a bill is disputed.
When to escalate
Start with the DisCo Customer Complaints Unit. In a transitioned state, use the current state electricity regulator for regulatory escalation; elsewhere follow the applicable NERC Forum route.
Frequently asked
Can an unmetered customer contest an estimated bill?
Yes. NERC lists transparent billing, complaint investigation and the right to contest a bill among customer protections.
Does a naira increase always mean the kWh estimate increased?
No. The total can also change because of tariff or arrears. Compare both the kWh and the price calculation.
Research sources
Official guidance, product information and public sources were reviewed on 27 July 2026.