The Belmeken Hydro Power Plant is an active pumped storage hydro power project in the eastern Rila mountains, Bulgaria. It receives its water from the Belmeken Reservoir and has 5 individual turbines with a nominal output of around 75 megawatts (101,000 hp) which can deliver up to 375 megawatts (503,000 hp) of power, as well as 2 pumps with an installed capacity of 104 MW. It is part of the Belmeken-Chaira-Sestrimo Hydropower Cascade.