EstLink 2 is the second high voltage direct current (HVDC) connection between Estonia and Finland, built by the Estonian and Finnish TSOs Elering and Fingrid. The main reason for building EstLink 2 is to increase the electricity transmission capacity between the Nordic countries and Estonia and the other Baltic states, in order to:
- deepen the integration of the electricity markets in the region around the Baltic Sea;
- improve the security of supply to the electricity markets in the Baltic states;
- diversify the sources of electricity supply in the Baltic states and integrate the electricity systems of those countries into the single European energy market.
The total length of EstLink 2 is almost 170 km. On the Estonian side it starts at the Püssi substation in Ida-Virumaa, which is one of the main substations in the Estonian electricity system. A converter station has been built next to the Püssi substation, from where an underground cable reaches 12 km to the coast before continuing as an underwater cable. The submarine cable runs at depths of up to 90 metres along 145 km of seabed before reaching land in Finland, where it run for 14 km to the Anttila converter station as an overhead line. The electricity reaches the Finnish electricity system through the Anttila substation beside the converter station.