Add fetch_be_forecast function to get Belgium solar forecast (regiona…

[Reem-Albadwy]

…l + national)

Pull Request

Description

This PR introduces a new function fetch_be_forecast to retrieve Belgium solar forecast data from Elia open data. The function collects both regional and national forecasts, standardizes column names, and ensures the datetime column is properly converted to UTC.

Related issue: Fixes #127

How Has This Been Tested?

• Function tested locally by fetching the CSV from Elia.
• Verified columns: target_datetime_utc, Region, solar_generation_kw.
• Converted the Datetime column to datetime format in UTC successfully.
• Verified that both regional and national forecasts are included in the resulting DataFrame.

Checklist

• My code follows Open Climate Fix coding style guidelines
• Self-review performed for correctness and readability
• Function tested locally and verified for correctness
• Documentation updated (not required for this PR)
• Additional tests added (not required for this PR)
• Spelling and grammar checked

[peterdudfield]

could you move this into a seperate file please, in the data dir

[peterdudfield]

Would you be able to write a test for this? perhaps an integration test?

[peterdudfield]

Also thank you so much for doing all this.

Does this code pull the regional data too?

[Reem-Albadwy]

Also thank you so much for doing all this.

Does this code pull the regional data too?

Hi @peterdudfield, thank you very much for the review — and sorry for the delayed response.

I’ve addressed your feedback in a new pull request (#134):

• Moved the Belgium logic into a dedicated module under solar_consumer/data/fetch_be_data.py, in line with the existing project structure.
• Updated the implementation to use the Elia records API with a rolling time-window and retry logic, instead of the CSV export, to make the ingestion more robust.
• Added an integration test to ensure that the fetcher returns both national ("Belgium") and regional forecasts.

Please let me know if you’d like anything adjusted or simplified further for the new PR — happy to iterate on this based on your feedback.

[peterdudfield]

Thanks @Reem-Albadwy , shall we close this one?

[Reem-Albadwy]

Thanks @Reem-Albadwy , shall we close this one?

yes, it is better to close it