Investigators have completed a probe into an accident at Russia's largest hydro-electric plant that killed 75 people in 2009.

Another 85 people were injured after water swept through the engine room at the Sayano-Shushenskaya plant in eastern Siberia.

Vladimir Markin, a spokesman for the investigative committee at the Russian Prosecutor General's office, said seven people, including the plant's former head Nikolai Nevolko and his deputies, were charged with safety breaches.

Located more than 4,000 km east of Moscow in the remote region of Khakassia, the Sayano-Shushenskaya plant is one of the biggest hydroelectric plants in the world.

MOSCOW, March 23 (RIA Novosti)