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Eskom has extensively applied computational fluid dynamics CFD to solve numerous plant related problems and improve plant efficiency. Applications include the modelling of Electrostatic Precipitators (ESPs), boilers, fans, burners, bag filters, mills, classifiers, air-cooled condensers and other related plant. CFD is a useful engineering tool to optimise design of new plant and retrofits. Extensive research into various topics of mathematical modelling by Eskom has laid the foundation for the successful application of this technology with the effect of proven benefits. The work has benefited system engineers at Eskom power stations regarding plant investigations and efficiency improvements. This paper gives an overview of the work carried out and the benefits obtained.