World’s First-ever Power Plant That Uses Coal Mine Ventilation Air as Fuel Now in Operation

When coal is formed, so is methane. When the coal is excavated, methane is released. Since methane in air is explosive in concentrations between 5 and 15%, ventilation air is used to dilute the methane to levels below 1% - well below the explosion limit. This safety measure leads to very large volumes of air with extremely low methane content being released to atmosphere.