Siemens, Framatome and Russia`s Atomoenergoeksport have been awarded a contract worth $313m for the modernization of the Kozlodui nuclear power station. The plant accounts for over 40 per cent of Bulgarian electricity production. The consortium will modernize No 5 and No 6 blocks, each 1000 MW, at Kozlodui, focusing on the re-cooling circuits of the reactors.