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

Pumped-storage hydropower (PSH) is a form of long-duration energy storage. It works by using surplus electricity (often during off-peak hours or from intermittent renewables like solar/wind) to pump water from a lower reservoir to an upper reservoir; when electricity is needed during peak demand, the water is released back through turbines to generate power. PSH is the largest form of grid energy storage globally and is critical for balancing the grid with the increasing share of renewable energy. It is not used for irrigation or rainwater harvesting.