noun
pumped storage power plant; pumped storage power station
A hydroelectric power plant that pumps water to an upper reservoir during low demand and releases it to generate electricity during peak demand.
この地域には大きな揚水発電所が建設された。
A large pumped storage power plant was built in this area.
揚水発電所は電力需要のピーク時に発電する。
Pumped storage power plants generate electricity during peak demand.
水力発電所 is a general hydroelectric power plant, while 揚水発電所 specifically refers to a pumped storage type that reuses water.
Compound of 揚水 (pumping water) + 発電所 (power plant).