Kubilius discussed the issue with visiting Latvian and Estonian counterparts Valdis Dombrovskis and Andrus Ansip at a trilateral meeting that started on Wednesday and is scheduled to proceed on Thursday.
"I can confirm that Latvians and Estonian are partners in this very intensive common work of continuing talks with Hitachi company and negotiating additional guarantees they want from the Lithuanian side regarding protection of their investments," the Lithuanian prime minister told the Žinių Radijas (News Radio) on Thursday morning.
"We can feel that the referendum initiative by some Lithuanian politicians is bringing in some doubts among them as to how all things will look like later, but we are working together on this very important project and hope the project will proceed successfully," the Lithuanian prime minister said.
The Lithuanian Seimas has decided to hold an advisory referendum on the construction of the new nuclear power plant alongside the upcoming general elections on 14 October.
Lithuania hopes to build Visaginas nuclear power plant by 2020-2022 with Latvia, Estonia, and Japans' Hitachi.