November 21 (SeeNews) - Bulgaria's engineering and construction group Enemona plans to put into operation a 1.5 billion lev ($1.1 billion/766 million euro) energy complex comprising lignite mines and a coal-fired power plant with an installed capacity of 400 to 600 megawatts by 2012, Enemona's corporate policy director, Prokopi Prokopiev, said on Wednesday.