In the recent years due to tremendous development and integration of renewable energy resources in Europe, hydraulic turbines and pump-turbines are key technical components to contribute to renewable energy production and to compensate for the stochastic nature of the variable energy sources, preserving thus the electrical grid stability.As a result, the overarching objective of the project is the enhanced hydropower plant value by extending the flexibility of its operating range, while also improving its long-term availability. More specifically, the project aims to study the hydraulic, mechanical and electrical dynamics of several hydraulic machines configurations – fresh and seawater turbines, reversible pump-turbines – under an extended range of operations : from overload to deep part load. A two-pronged modelling approach will rely on numerical simulations as well as reduced-scale physical model tests. Upon suitable concurrence between simulations and reduced-scale physical models results, validation will take place on carefully selected physical hydropower plants properly equipped with monitoring systems.To address this ambitious research plan, a consortium has been assembled featuring three leading hydraulic turbines, storage pumps, reversible pump-turbine and electric equipment manufacturers, SME, as well as world-renowned academic institutions. Extensive tests both on both experimental rigs and real power plants will be performed in order to validate the obtained methodological and numerical results.