Poland has decided to freeze its participation in a four-country project to build a new nuclear power plant in neighbouring Lithuania, state energy group PGE said on Friday. \"Given the conditions, which have turned out to be unacceptable at the current point, and given our group\'s other key projects, we have decided to freeze our participation in this programme before making any formal commitments,\" PGE\'s head Tomasz Zadroga said in a statement.