SOFIA (Bulgaria), August 12 (SeeNews) – Czech energy group CEZ said on Tuesday it turned to negative earnings before interest, taxes, depreciation and amortisation (EBITDA) of 200 million Czech crowns ($9.6 million/7.2 million euro) from power production and trade in Bulgaria in the first half of 2014 from a positive EBITDA of 100 million crowns a year earlier.