An increasing supply of energy from renewable sources is expected soon, demanding more energy storage alternatives in the short and long-term. The short-term deals with short duration ranging from instantaneous operation (load generation balance) to satisfactory daily and weekly load curve. In the long-term, the stored energy comes from seasonal periods of excess generation that can extend over considerable time intervals. When considering the interconnection of large-scale electrical systems, the volume of surplus energy can reach hundreds of GW. The use of this surplus energy to generate hydrogen appears as a great opportunity to store clean energy, contributing to the efficient exploitation of the installed renewable capacity and contributing to the system’s decarbonization. On the other hand, areas with little economic interest or isolated areas with good potential for renewable energy are becoming attractive to produce the so-called green hydrogen, contributing to an important step towards establishing a green economy. This paper presents a brief review and discussion of expectations regarding hydrogen as an alternative for large-scale energy storage.
