During September 2025, Leon Thurner focused on enhancing the DER Controller within the JakobKirschner/pandapower repository by addressing a power saturation bug affecting distributed energy resource scenarios. He implemented a vectorized approach to the apparent power saturation logic, which improved both accuracy and stability when managing multiple DERs. Leon updated the parameter handling by treating saturate_sn_mva as an array and introducing a new activation flag, making the controller more flexible and maintainable. Working primarily in Python and leveraging his expertise in control systems and power systems engineering, he ensured the changes were well-documented and integrated into the project’s changelog.