7. High-temperature heat storage combined with electricity generation

Renewable energies that produce electricity directly (wind, solar photovoltaic, marine energies, etc.) have the advantage of using clean, inexhaustible energy resources, but also the disadvantage of being diffuse, variable and disconnected from demand. What's more, because they are converted directly into electricity, they cannot be stored directly. They are therefore stored in the form of a reversible transformation into a potential of the gravitational type (pumped-storage energy transfer stations), compressed air (Compressed Air Energy Storage and its derivatives), or electrochemical (numerous types of batteries), or even hydrogen ...