Further to this, one of the main concerns for Lithuania (and other Baltic states) is energy independence from Russia. Ignalina made them a net-exporter of electricity, but now almost 70% of electricity is imported, mostly from Sweden. Gas and oil mostly comes from Russia, and all national gas companies in the Baltic states are largely owned by Russian companies.

As you say there is no reason for another plant to be built in the area now, but it'll also mean the Baltic states most likely end up purchasing electricity from Belarus. As they have strong political ties with Russia, that doesn't really help their case in becoming more independent.