The ability to store massive amounts of dispatchable energy is key for the development of reliable and flexible energy systems, particularly under the new energy concept where large renewable power plants increasingly farther from end users will operate together with distributed wind and solar power plants. Massive energy storage enables a wide set of features ranging from improved supply and demand adjustment, increased system reliability and decarbonization of energy intensive sectors including heating services, industry, and transport. Within this framework, green hydrogen outstands as a key solution to unleash the full potential of renewable energy sources to decarbonize energy applications…