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Chaira Hydro Power Plant : ウィキペディア英語版 | Chaira Hydro Power Plant
The Chaira Pumped Storage Hydro Power Plant (Chaira PSHPP) was built in Rila mountains, about southeast of capital city, Sofia. Chaira has generating capacity of and a pumping capacity of , and is thus the largest pumped-storage plant in southeast Europe. The power plant is equipped with four reversible Francis pump-turbines, each rated at in the generating mode, and in pumping mode. Units 1 and 2 have been in operation since 1995, and that time Chaira was the highest head in the world for a single-stage pump turbine ( generating and pumping). Units 3 and 4 came online in 1999. The pump-turbines and motor - generators were supplied by Toshiba, and three of them were manufactured under Japanese supervision in Bulgaria. The upper compensating basin for Chaira is the Belmeken reservoir that is connected to the Chaira pumped storage hydro power plant by two headrace tunnels with a diameter of and two penstocks with diameter , reducing to . ==References==
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