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Electricity & gas · Belgium
Checked 2026-09-30

🗓️ Estimated bills and back-billing in Belgium: how far back can my supplier charge me?

The short answer

If your meter was not read for a long time, a large catch-up bill can follow. Many countries limit how far back a supplier may charge and set rules for meter readings.

📜 The rules in Belgium

Back-billing and estimated bills

Under the federal consumer agreement 'De consument in de vrijgemaakte elektriciteits- en gasmarkt', a supplier may correct billing errors for at most 12 months after the payment date. If the error comes from a third party, such as the grid operator, the period set by the regulations applies.

  • Flanders: the grid operator may correct meter data for the last two periodic meter-reading periods (about 2 years), and up to 5 years when the correction is in your favour or in case of bad faith (Technical Regulations). (ombudsenergie.be)
  • For a late bill the Energy Ombudsman asks the supplier for compensation equal to the admin fee it charges for late payment, about €8 per month of delay. This is the Ombudsman's practice, not a legal right. (ombudsenergie.be)
Official source: ombudsmanenergie.be · Checked 2026-09-30

🪜 Step by step

  1. Read your meter nowTake a dated photo and send the reading to your supplier. It stops estimates from growing.
  2. Check the period on the billWhich months are charged, and was the reading real or estimated?
  3. Compare with the rulesSee below how far back a supplier may bill in Belgium and how often your meter must be read.
  4. Dispute in writingIf the bill goes back further than allowed, write to the supplier, then to the dispute body below.

📇 Who to contact

Ombudsdienst voor Energie / Service de Médiation de l'ÉnergieSettles disputes with energy companiesWhen the company has not solved your complaint📞 +32 2 211 10 60🔗 www.ombudsmanenergie.be/nl
CREG – Commissie voor de Regulering van de Elektriciteit en het GasSupervises energy companies and explains your rightsFor information, and to report a company that breaks the rules🔗 www.creg.be/nl
Vlaamse Nutsregulator (VNR, voorheen VREG) (Flanders)Supervises energy companies and explains your rightsFor information, and to report a company that breaks the rules🔗 www.vlaamsenutsregulator.be
CWaPE – Commission wallonne pour l'Énergie (Wallonia)Supervises energy companies and explains your rightsFor information, and to report a company that breaks the rules🔗 www.cwape.be
BRUGEL (Brussels-Capital Region)Supervises energy companies and explains your rightsFor information, and to report a company that breaks the rules🔗 brugel.brussels

❓ Questions

Do I have to pay a huge catch-up bill at once?

Ask for a payment plan. Many suppliers must offer one; the rules for Belgium are on this page.

Why did I get an estimated bill?

No reading was available. Send a real reading and ask for a corrected bill.

What if the meter was faulty?

Ask the grid operator to test it. Keep the test report for your complaint.

📎 Sources

Checked: 2026-09-30

🧭 Is this still correct?

We check this information carefully, but phone numbers, websites and rules change — and sometimes we get something wrong. Spotted a mistake or a change? Let us know below.

🔗 Also useful

🧾Wrong or high bill→📣Complaint about a supplier→📟Smart meter→🔄Switching supplier→📈Price increase→

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