Renewable energies remain the only alternative to fossil fuels. The development of clean and sustainable energies (solar, wind, hydro, etc.) has become more than essential. An important chain to increase the use of these inexhaustible energy resources is the development of advanced materials with efficient conversion and storage. Current projects give hope that one day we will be independent of polluting energies sources with high greenhouse gas. This seminar will address the energy issues and challenges related to energy conversion and storage to be achieved by 2050.