Renewable energy sources are experiencing a period of rapid growth, with the U.S. Energy Information Agency forecasting that they will be the fastest growing source of electricity generation in the near future. However, renewable energy sources such as solar and wind suffer from supply and demand imbalances, because their most productive periods are when electricity demand is lowest, leading to a surplus of unused energy, and they are least productive when electricity demand peaks, leading to energy shortages that must be filled by other means. To address this issue, renewables must be supplemented with other dispatchable energy sources, which can instantaneously adjust output to match shifts in energy demand. One promising option to fulfill this dispatchable energy role is hydrogen energy storage.

Hydrogen energy storage is a process wherein the surplus of energy created by renewables during low energy demand periods is used to power electrolysis, a process in which an electrical current is passed through a chemical solution in order to separate hydrogen. Once hydrogen is created through electrolysis it can be used in stationary fuel cells, for power generation, to provide fuel for fuel cell vehicles, injected into natural gas pipelines to reduce their carbon intensity, or even stored as a compressed gas, cryogenic liquid or wide variety of loosely-bonded hydride compounds for later use. Hydrogen created through electrolysis is showing great promise as an economic fuel choice, with data from the International Energy Agency predicting that hydrogen generated from wind will be cheaper than natural gas by 2030.