Your comment prompted me to do some research on that line to Poland.
According to sources I've found (all in Polish, so I'm not linking them here), this 220kV line Between Bialostok and Rossj was built in 1962 and is out of use since 2004. The power to the region is delivered by 100kV lines which are not shows on this map.
There was an idea to build a new one double 400kV line to import energy from Belarus but nothing going on so far.
According to sources I've found (all in Polish, so I'm not linking them here), this 220kV line Between Bialostok and Rossj was built in 1962 and is out of use since 2004. The power to the region is delivered by 100kV lines which are not shows on this map. There was an idea to build a new one double 400kV line to import energy from Belarus but nothing going on so far.