The Chaira Pumped Storage Hydro Power Plant (Chaira PSHPP) was built in the Rila mountains, about 100 kilometres (62 mi) southeast of Bulgaria's capital city, Sofia. Chaira has generating capacity of 864 megawatts (1,159,000 hp) and a pumping capacity of 788 megawatts (1,057,000 hp). The power plant is equipped with four reversible Francis pump-turbines, each rated at 216 megawatts (290,000 hp) in the generating mode, and 197 megawatts (264,000 hp) in pumping mode. Units 1 and 2 have been in operation since 1995, and at that time Chaira was the largest pumped-storage plant in southeast Europe with the highest head in the world for a single-stage pump turbine (690 metres (2,260 ft) generating and 701 metres (2,300 ft) 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 basin for Chaira is formed by the Belmeken Dam which connects to the pumped storage plant by two headrace tunnels with a diameter of 4.2 metres (14 ft) and two penstocks with diameter 4.4 metres (14 ft), reducing to 4.2 metres (14 ft).[1] Outflow from the Belmeken reservoir supplies the Sestrimo Hydro Power Plant

Chaira Pumped Storage Hydro Power Plant
Belmeken Dam
Country	Bulgaria
Location	Pazardzhik Province
Coordinates	42°9′32″N 23°52′15″E
Status	Operational
Opening date	1995 (units 1 and 2) 1999 (units 3 and 4)
Owner(s)	NEK EAD
Reservoir
Creates	Belmeken reservoir
Power Station
Installed capacity	864 MW

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[de] Pumpspeicherkraftwerk Chaira