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Consider the optional tarif Impact only if you can shift big electricity loads

Since 2026 Walloon households with a smart meter can opt for tarif Impact, a grid tariff with five time bands at three price levels. The regulator says it is not meant for most consumers, only for those who can move large loads.

Wallonia · Subject to change

Sources checked on · next check by . Check the source before you act.

Contracts & billsLevel 1 · HabitCost: FreeA few hours

Since 1 January 2026, Walloon households have a third way to pay for the use of the electricity grid, next to the single-rate and bi-hourly (day/night) tariffs: tarif Impact, an optional time-of-use grid tariff. It spreads the day over five time bands, billed at three price levels that your bill names PIC (peak), MEDIUM and ECO. It is intended for grid users who have a smart meter.

CWaPE, the Walloon energy regulator, says plainly that this option is not meant for most consumers. It is aimed at households with large loads they can move to the cheap hours, such as some electric-car owners or people with an electric water heater.

Nothing changes unless you ask for it: if you make no choice, you stay on your current single-rate or bi-hourly tariff. To switch to tarif Impact, you have to tell your supplier explicitly.

Details

ImpactIndirect · This saves no energy by itself: it is a rule, a service, a contract, or a health or safety item. How we rate impact
Estimated savingDepends on how much of your use you can move to cheaper time bands; the sources give no figure and the tariff saves no energy by itself. (confidence: low)
Who actsYou (tenant)
Needs landlord's agreementNo
TypeRules explained

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Sources

  1. Communiqué de presse : Changements en 2026 au niveau des tarifs de distribution pour l'ensemble des utilisateurs du réseau électrique basse tension wallon (in French) · CWaPE (official source) · checked on
    Backs: tarif Impact in force from 1 January 2026 as an option for grid users with a smart meter (compteur communicant) who can shift large loads, such as electric vehicles
    Where: article body (4 November 2025)
  2. Dossier de presse - Nouveaux tarifs pour le réseau de distribution basse tension en Région wallonne en 2026 (in French) · CWaPE (official source) · checked on
    Backs: optional; five time bands billed at three rates named PIC, MEDIUM and ECO, names used on supplier bills; not meant for most consumers; aimed at large movable loads such as some electric cars or electric water heaters; without an explicit choice you keep your single-rate or bi-hourly tariff; to opt in you tell your supplier
    Where: article body, bullets on the tarif Impact and on the default choice; press kit PDF p. 2

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