Thu Dec 20, 2007 8:04am EST
SOFIA, Dec 20 (Reuters) - Bulgaria's state power utility NEK said on Thursday it had asked strategic investors to file improved offers to acquire a 49-percent stake in a planned new nuclear power plant by Jan. 9.
NEK executive director Lyubomir Velkov told reporters all five short-listed bidders had been invited to sweeten their bids for the 2,000 megawatt, 4.0 billion euro ($5.75 billion) power plant at the Danube river town of Belene.