Wind and solar energy storage is classified under the broader field of renewable energy systems and energy management. This area encompasses various disciplines including electrical engineering, environmental science, and systems. . Growing levels of wind and solar power increase the need for flexibility and grid services across different time scales in the power system. The Energy Department is working to develop new storage technologies to tackle this challenge -- from supporting. . Energy storage is one of several potentially important enabling technologies supporting large-scale deployment of renewable energy, particularly variable renewables such as solar photovoltaics (PV) and wind. They depend on natural factors like sunlight, wind speed, and weather conditions.