NOVELTY - The system has an exterior metallic enclosure (1) containing cryogenic fluid (3) e.g. under-pressure liquefied gas such as liquid nitrogen. An electrically conducting material (2) with piezo-electric properties is a type of granular powder or porous mass with a contact surface that is contact with the fluid. An anode (5) is connected to an end at a central zone of the system, and a cathode (6) is connected to another end at a peripheral part of the system, where the system is in the form of spherical, oval, flatten ellipsoidal.    USE - System for collecting energy i.e. heat energy, of a surrounding medium in a form of heat to convert the energy into electric current to provide supply to an electrical circuit. Can also be used as a direct current electric power generator in a electric generating station and autonomous current generator for equipping a production facility, homes, individual building, resort and small towns, auxiliary current generator, as portable installation and equipping power vehicle, rolling vehicles comprising a public work appliance and handling appliance, locomotive trains, on-board machine, ships, aircraft and boats, spacecraft, sub-marine, mobile equipment, as a low power electrical equipment, and driving an autarchic, computer, cooking apparatus and electronic equipment, use in chemical industry for supplying fuel cells and electrodialysis units producing drinking water and in industry to produce heat for energy supply of an oven and use as a diode.    ADVANTAGE - The system has less encumbrance and high power compared to the solar energy, wind energy, or renewable energy. The system is compact, efficient and autonomous.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of a system for collecting energy i.e. heat energy, of a surrounding medium in a form of heat to convert the energy into electric current.    Exterior metallic enclosure (1)    Electrically conducting material (2)    Cryogenic fluid (3)    Anode (5)    Cathode (6)