Maintenance scheduled for Monday, 21 september, 2020
In order to continuously improve our services, we are planning a maintenance of this website on Monday 21/09/2020 from 9am to 6pm, during which brief interruptions of service could possibly occur. We apologise for any inconvenience this may cause and thank you for your understanding.
“Day-ahead forecast (11h00)” published from the May 29, 2019 till August 26, 2020 was taken daily around 18h00. Since August 27, 2020 the “Day-ahead forecast (11h00)” represents again a snapshot in line with the legend, i.e. 11h00. Elia is working to update the values between May 29, 2019 and August 26, 2020 with the 11h00 snapshot values. This should be available in the data download section at the latest end of November 2020.

Wind power generation

Continuously tracking and forecasting wind power generation enables Elia to operate its grid smoothly around the clock.

Wind forecast

Storm alert notification


Filter 1:

Filter 2:

Begin date:

End date:

Data download:


1 Storm alert notification

  • Forecasting tool

    A notification is generated when the forecasting tool detects a Storm event in the North Sea in the next 36 hours. The total storm impact in terms of wind power generation drop and the timing of the storm are published.

2 How to

  • Change filters on the graph
    Changing the filters by clicking on the refresh button will adapt the graph display accordingly. Note that you can also click on the graph legend to select/unselect curves to be displayed.

3 Graph Legend

  • Time interval
  • Forecast period

    The forecast period always begins with the D Forecast (intraday data) and runs to the D+7 forecast (future data).

  • Week-ahead forecast

    This is a snapshot of the D+7 forecast and is updated at 4.45 p.m. (with values created at 4.00 p.m.).

  • Day-ahead forecast

    This is a snapshot of D+1 forecast and is updated at 11.35 a.m. (with values created at 11.00 a.m.).

  • Most recent forecast

    Offshore forecast is updated - at 1.00 am, 6.00 a.m., 10.00 a.m., 1.00 p.m., 6.00 p.m. and 10.00 p.m. (CE(S)T) in summer time and at 5.00 a.m., 9.00 a.m., 12.00 p.m. (midday)., 5.00 p.m., 9.00 p.m. and 11.55 p.m. in winter time Onshore forecast is updated every hour at around hh:05.

  • Measurement updates

    The unique quarter-hourly value for upscaled measurements is updated every quarter of an hour. The value is always the amount of power equivalent to the running average measured for that particular quarter-hour. These measurement data are always obtained from an estimate based on an extrapolation, since Elia does not have all the measurement data at its disposal.

  • Monitored capacity
    Elia always tries to ensure that its forecasts and the corresponding measurements reflect the latest situation with regard to installed wind power capacity in the Belgian control area. However, it can only show forecasts and measurements for monitored capacity for which it has detailed background information.
    Depending on the filters selected, the monitored capacity displayed is shown in the graph alongside the filter buttons.
  • Load factor

    The percentage ratio between measured wind power generation in [MW] and total monitored wind power capacity in [MW].

  • Active decremental bids

    This indicates whether wind power has been reduced following the activation of decremental bids on wind farms.

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