SOFIA (Bulgaria), October 21 (SeeNews) – Bulgarian power distributor Energo-Pro Sales [BUL: 4ES], a unit of Czech group Energo-Pro, said it has received a statement of claim by the country's National Electric Company (NEK) for 6.7 million levs ($ million/3.4 million euro) in receivables representing unpaid invoices for provided electricity, part of a total of 67.3 million levs in claimed receivables.