Why the Gangwon Province Pumped-Storage Power Plant Lifts River Water Up the Mountain Every Night

There's a power plant that devours electricity all night long. It uses surplus electricity to pump water up to a mountaintop reservoir, and then when electricity is scarce, it lets the water fall back down to convert it into electricity again. The entire mountain is essentially a giant water battery. What's truly terrifying is during a blackout. When other power plants can't start up due to a lack of initial electricity, pumped-storage power can come online in just 3 minutes, becoming the first spark to revive the nation. Tonight, they're pumping water up again.