Tarek Abdelmeguid migrated the OPENNEM production data handling to version 4 for the electricitymaps-contrib repository, delivering an upgraded energy production endpoint while maintaining compatibility with the existing test suite. He focused on backend development and API integration using Python, ensuring that all tests continued to pass after the migration, which reduced production risk and supported future upgrades. Tarek also improved repository hygiene by updating the gitignore and cleaning up non-production and test code. As part of the migration, he addressed minor data parsing issues, such as battery sign alignment, contributing to the correctness and maintainability of the codebase.