One Possible Use for Hydrogen as an Energy Storage Mechanism

One possible use for hydrogen as an energy storage mechanism is for large-scale grid storage instead of pumped hydroelectric or compressed air. Consider the possibility of using the cavern at the Huntorf facility to store hydrogen with the same maximum pressure that is now used to store compressed air. The hydrogen could then be burned in a hydrogen ICE to generate electricity. Estimate the relative electrical energy that could be produced by the two approaches.