A film about the construction of the largest hydroelectric power station in Iceland. Landscapes: mountains, waterfall, geyser. Construction of the Sigalda hydroelectric power station on the Tungnaau River. Soviet and Icelandic specialists study the drawings, participate in the installation and adjustment of hydraulic equipment. Installation, commissioning of the generator. Hydroelectric power plant machine room, control panel. Production of turbines for the Sigalda hydroelectric power station at the Kharkov Turbine Works.