There are five synchronous electricity areas in Europe: Continental Europe (CE), Nordic, Baltic, British and finally the area of Ireland and Northern Ireland. The CE area with the synchronised transmission grids of 26 countries is not only the largest in Europe, but also one of the largest interconnected power systems worldwide. The synchronisation of the Baltic area with CE is of strategic importance for the European Energy Union, one of the political priorities of the European Commission. Currently, the Baltic system is only asynchronously linked to CE between Lithuania and Poland through the “LitPol Link” and at two points to the Nordic region.
An application for a future synchronisation of the Baltic and CE systems was made by the three Baltic transmission system operators (TSOs) Elering, AST and Litgrid with support from TSCNET shareholder PSE, the Polish TSO. The European Network of Transmission System Operators (ENTSO-E) has now announced the first landmark for the project: An agreement on the conditions for a synchronous interconnection became effective on 27 May 2019. Synchronisation will enable the Baltic TSOs to operate their systems in the future at the same frequency as the CE system and in compliance with EU rules.