The world’s largest hydroelectric power station is built on the Yenisei River near the city of Krasnoyarsk. Concrete dam, more than a hundred meters high, is a landmark of the city, which is located fifty kilometers below the dam. They built hydroelectric power station in Soviet times for 16 years. In the 70s, the hydroelectric power station began to generate electricity. More than 20 billion kilowatt-hour of electricity annually is produced by this hydroelectric power station. Energo audit is not rarely held at such facilities.