Is power storage a specialty of energy storage

Energy storage is particularly needed for grids that rely on renewable energy sources, such as solar and wind power, so that during periods without sunlight or wind when generators are not operating, electricity can still be sent to consumers.

Energy storage devices can supply either primary power or secondary power. Devices such as batteries, capacitors, and fuel cells, for instance, may provide primary power, usually for portable electronics or vehicles—anything that must be used apart from the steady supply of an electrical power grid.

An energy storage system can provide relevant support to the electrical system for the integration of renewable energy sources. This application is quite common and it is one of the main applications already operated by traditional pumped-storage hydroelectric plants.

The seasonal power storage is the ability to store energy for a daily, weekly, or monthly duration, which is used to compensate for the energy loss of long-term supply or seasonal variation in the supply and demand sides of a grid. Mark Kraeling, Michael C. Brogioli, in Software Engineering for Embedded Systems (Second Edition), 2019

It is different in kind from the various forms of natural energy storage, such as the storage of radiant energy from the sun in wood, oil, or coal, which have historically supplied the energy for the generation of the electrical power that supports modern technological civilization.

Energy storage systems are categorized into mechanical (such as pumped hydro and flywheels), electrochemical (including various battery types), and electrical storage systems (like supercapacitors). Each type operates based on different principles of energy containment and release, with unique efficiencies and applications.