Hydroelectricity represents 13 to 14% of the energy mix in France. At the crossroads of 3 major issues: energy, economy and regional development, the sector is key to the transition towards a low-carbon economy. Often left aside and considered as mature, hydroelectricity field is constantly innovating. What are the assets of this sector, which should play a major role in the development of other renewable energies, and what are the innovations and potential in the new electricity mix? How to improve its production capacity? What innovations will enable storage projects by 2023 in order to implement from 1 to 2 GW of capacity in 2025-2030 timeframe?