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Dynamic model of a hybrid Pumped Storage Hydropower Plant with batteries and flywheel for the provision of frequency regulation services of the electrical system (primary, secondary, and Fast Reserve). A procedure identifies the optimal configuration that maximizes the NPV (Net Present Value), taking into account the costs and remunerations of the services. The scalable model is applied to the case of the hypothetical marine pumped storage hydropower plant in Foxi Murdegu (Sardinia), also integrated into the Sardinian grid.