The DTEK Group, Ukraine's largest private energy company, lost 50% of its generating capacity during the last complex attack by Russia on the night of March 22, the assessment of losses were provided by YASNO CEO Serhiy Kovalenko. "The DTEK group has lost 50% of its generating capacity. We can officially state this information. We all know which nodes were damaged and so on," he said during a national telethon on Sunday.