The synchronous area of Continental Europe was split into two separated grid regions between 14h05 CET and 15h08 CET when it was reconnected on 8 January 2021.
An area in the south east region of the interconnected grid was during that period separated from the rest of Continental Europe. A temporary frequency drop of approximately 250 mHz was registered. Coordinated actions and an immediate response taken by the Continental European Transmission System Operators ensured that the system stability was not affected in most European countries.
An investigation is ongoing on the cause of this system split and further information on this incident will be made in due course.