Nordic Investment Bank (NIB) has signed a 10-year-maturity, EUR 50 million loan agreement with AB Litgrid for the construction of an electricity transmission line between Lithuania and Poland. The LitPol Link will be the first interconnection between the Lithuanian power system and the electricity infrastructure of Western Europe.

More information is available here.

There is also another example on how cross-border cooperation can achieve much as long as goals on both sides of the border are the same is the second high-voltage direct current link between Finland and Estonia which has been built in the frame of the project  EstLink 2.

Thanks to the EstLink 2 connection, electricity markets in the Baltic Sea region took a step forward. The connection has tripled the transmission capacity between Finland and Estonia and removed one of the worst transmission bottlenecks in the Baltic Sea region. Also, electricity prices in Estonia and Finland have been harmonised.
 

 
The total length of EstLink 2 is approximately 170 km, some 14 km of which is an overhead line in Finland, about 145 km a submarine cable laid on the bottom of the Gulf of Finland, and about 12 km an underground cable in Estonia.

More information is available here.