Batashki Vodnosilov Pat) is situated in the Pazardzhik Province, southern Bulgaria and is among the first hydroelectric cascades in the country.

Inaugurated on 6 September 1959, it includes seven reservoirs and three underground hydro power plants — Batak, Peshtera and Aleko with a combined installed capacity of 254.2 MW, producing an average of 796 GWh annually.

[2] The first level of the cascade includes the facilities located above 1,520 m altitude, grouped in two hydro junctions, Shiroka Polyana and Golyam Beglik.

[2] Shiroka Polyana junction is a system of dams and pumping stations, aimed at collecting water from the upper course of the catchment areas of the rivers Dospat and Vacha, including the latter's tributary, the Gashnya.

[6] It has a stone dam with a height of 46.50 m and a length of 190 m, located at an altitude of 1528.5 m. The reservoir serves as an annual leveler of the cascade and has a total volume of 62.1 million m3.

At its left bank begins the main pressure culvert to the Batak HPP, with a length of 11.7 km, diameter of 2.4 m and a capacity of 13.6 m3/s.

Beglika is located immediately below the dam Golyam Beglik and serves as a seasonal equalizer of waters from the catchment of the Beglishka reka.

Part of the water of the reservoir flows through a 3 km long pressure culvert to the Peshtera Hydro Power Plant.

[11][18] The utilized water enters the lower equalizer dam with a volume of 280 thousand m3[17] and is channeled the Upper Thracian Plain, where it is used for the irrigation of up to 400 km2 of agricultural land.

Studies for the construction of the Batak Reservoir began in 1945 and as a result, the position of the dam was changed compared to Ivan Mavrov's original idea.

Based on the competition materials, the design comcept of three main cascades was formed, all of them eventually realized — Dospat–Vacha, Batak and Belmeken–Sestrimo.