Forschungszentrum AZARE

In power-to-power technology (electricity to electricity), surplus energy is stored in batteries, as fuel or via hydropower so that it can be used at a later date. A distinction is made between short-term and long-term storage.

In the short term , electricity from photovoltaics or wind energy can be temporarily stored in lithium-ion or redox flow battery storage systems in order to maintain the electrical grid during periods of low yield, for example in the evening and at night.

Long-term storage of electrical energy is another option. Electrolysis can be used to generate excess electricity to produce hydrogen, which can be temporarily stored as fuel. If the electricity requirement or local demand (megacharger) exceeds the available supply in the grid, electricity can be generated and fed back into the grid using fuel cells - by utilizing the chemical reaction of hydrogen with oxygen from the air.