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.
In a study published by WWF in May 2007 under the title "Dirty Thirty," Prunéřov Power Station was identified as having one of the worst efficiency ratings for power generation compared to CO₂ emissions among European stations.