Recently, the term "pumped-storage hydropower" is actually and appropriately discussed in the context of which one of the following?

Correct Option: (c) Long duration energy storage

Pumped-storage hydropower (PSH) acts as a giant water battery and is appropriately discussed in the context of long-duration energy storage for power grids. It stores energy by pumping water from a lower reservoir to an upper reservoir during periods of low electricity demand and releasing it to generate electricity when demand peaks.