NOVELTY - The energy conversion system comprises a first electrode, a second electrode and an interelectrode gap that includes a functional medium. The first electrode is made of an elongate electrically conductive unit having a total length L of 1 km, a curved cross-section and a radius of curvature R of lower than 40 mu m, and arranged into a sturdy assembly structure having an open pattern capable of having same electric potential at any location. The inter-electrode gap has a thickness of 1 nm to 5 mm. The electrically conductive unit is self-supportive.    USE - The energy conversion system is useful in an energy conversion device such as an electrolysis device, a photolysis device, an electro-synthesis device, an electric generator by inverse electrolysis, a fuel cell, an electric storage battery, an ozone generator, an electrodialysis unit, a condenser, discharge lamp, a photovoltaic generator and a solar cell with photo-active conductor (all claimed).    ADVANTAGE - The system ensures high conversion of energy at low cost with improved performance and efficiency.    DETAILED DESCRIPTION - The energy conversion system comprises a first electrode, a second electrode and an interelectrode gap that includes a functional medium. The first electrode is made of an elongate electrically conductive unit having a total length L of 1 km, a curved cross-section and a radius of curvature R of lower than 40 mu m, and arranged into a sturdy assembly structure having an open pattern capable of having same electric potential at any location. The inter-electrode gap has a thickness of 1 nm to 5 mm. The electrically conductive unit is self-supportive, present in the form of filament, fiber or spike and coiled on a closed circuit and non-coiled on an open circuit, and comprises an electric conductor, and an internal electrically insulating internal structure covering an outer conductive layer. A ratio L/R is greater than 106 such that the first electrode generates, at the nanometric to millimetric level, a significant increase in the electric field perceived by the second electrode. The first electrode comprises a mechanically resistant part. The overall structure of the electrically conductive unit is a (non)organized bulk structure in the form of sheet, plate, strip or coil. The first and second electrodes have asymmetric or pseudo-symmetric structure.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic perspective view of a device for conversion of energy.    Rotational axis (102)    External hollow enclosure (103)    Anode compartment (104)    Cathode compartment (105)    Anode. (106)