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Pumped hydro storage (PHS) units represent the most mature technology for large scale energy storage. The ideal criteria for a PHS unit installation include: (a) the existence of an autonomous power system with local power stations, (b) the current high electricity production cost, (c) the high potential of renewable energy sources (mainly wind), and (d) the non-flat terrain morphology. Cretan power system represents an ideal case for the installation of PHS units, as it fulfils all of the above criteria. This paper shows the effect of the installation of a planned PHS unit in Malia, Heraklion, Crete. The calculations are based on real data provided by the Cretan power system operator, whereas the results show the effect of PHS units operation on the energy mix, as well as the economic viability of the project which is combined with significant environmental benefits. Y. A. Katsigiannis,E. S. Karapidakis The Effect of Pumped Hydro Storage Units Installation... 298

The Effect of Pumped Hydro Storage Units Installation on the Operation of the Autonomous Cretan Power System