The project will allow converting low potential thermal energy into mechanical energy and then using mechanical energy to convert it into electric energy. Heat can be obtained from geothermal sources, direct solar heating, wind or any other sources. The principle of conversion is the evaporation of low-boiling liquids due to a heat source and condensation due to cooling by ambient air. Evaporation and condensation occur in a closed space, which consists of two containers connected by a capillary tube. While one container is in hot water, the second container is in the air. The liquid in the first container evaporates, as a result of it this container becomes empty and is pushed out of the water. At the same time, liquid vapor through the tube enters the second cooled container and condenses in it. As a result, the second container outweighs the first and falls into hot water. The process is repeated. In the middle of the tube there is a fastening element connecting the system of two containers with an axis of rotation perpendicular to the tube. There should be several such systems of two containers on the same axis, which will create a significant torque in order to set in motion the generator of electric energy.