The Paatsjoki River flows from Lake Inari in Finland and for most of its duration, it marks the border between Russia and Norway.
The Russian hydroelectric installations belong to Territorial Generating Company № 1, based in Saint-Petersburg, Russia.
The Kaitakoski hydroelectric station (Russian: Кайтакоски ГЭС (ГЭС-4)) in Russia on the Paatsjoki River (68°56′19″N 28°36′02″E / 68.93861°N 28.60056°E / 68.93861; 28.60056) began operation in 1959.
The Jäniskoski hydroelectric station (Russian: Янискоски ГЭС (ГЭС-5)) (68°58′18″N 28°46′49″E / 68.97167°N 28.78028°E / 68.97167; 28.78028) was constructed from 1938 to 1942, at that time on Finnish territory.
After the war, the power station was rebuilt by Finnish firm Imatran Voima (today Fortum) on a contract with the USSR, and reentered operation in 1950.
The Hevoskoski hydroelectric station (Russian: Хевоскоски ГЭС (ГЭС-7), Norwegian: Hestefoss kraftverk) on the Paatsjoki River (69°07′03″N 29°14′31″E / 69.11750°N 29.24194°E / 69.11750; 29.24194), was built between 1956 and 1970.