Views of the high-mountainous Lake Sevan in Armenia and the Hrazdan River. Buildings and equipment of power plants of the Sevan system. Testing of operating models of hydraulic structures in the laboratory of the Water-Energy Institute at the Academy of Sciences of Armenia. Construction sites for a new power plant, a tunnel for a water canal in the mountain and an irrigation canal. Installation of supports and installation of power lines. The use of electricity in agriculture for electric shearing of sheep, electric milking of cows and in industry at a cement plant and a silk-weaving factory in Yerevan. Types of dam, pumping station, canals, aqueducts of the irrigation system. Fruit orchards in the Ararat valley and on the shore of Lake Sevan.