Butkevičius' spokeswoman Evelina Butkutė-Lazdauskienė told BNS on Monday that official letters were being prepared.
"The prime minister is planning to send letters to the Latvian and Estonian prime ministers to explain to them what decision Lithuania has made and to invite them to look at the scientists' findings. The letters are now being prepared and we expect to send them out today," she said.
Butkevičius has told LRT Television that he is planning to discuss the future of the Visaginas project with his Baltic counterparts in Riga in late May.
"I'll have a meeting with them in Riga on May 30," he said.
After the working group, set up by Butkevičius' government, has found that the nuclear power project is too expensive for Lithuania and that the price of electricity generated at the new facility may be non-competitive, the authorities say that the project could only be continued if its terms were improved through talks with Latvian and Estonian energy companies and Japan's Hitachi.