August 2 (SeeNews) - Bulgaria's state-owned National Electricity Company, NEK, turned to a net loss of 74.1 million levs ($44.0 million/37.9 million euro) in the first half of 2018 from a net profit of 1.5 million levs in the same period of 2017, due to a rise in expenses for purchasing electricity, figures from the company's financial report showed.