According to the study Dirty Thirty, issued in May 2007 by the WWF, Prunéřov Power Station was the twelfth-worst power station in Europe in terms of the relation of energy efficiency to carbon dioxide () emissions.
According to the WWF's report "Dirty Thirty" from May 2007, Prunéřov Power Station was ranked as one of the least efficient in Europe concerning its energy output and carbon dioxide emissions (CO₂).