Abstract: The present invention relates to an electric generator, of the type including thermoelectric cells electrically attached and insulated between both walls of a duct separating a moving internal fluid and an external fluid having a temperature different from that of the internal fluid. The thermoelectric cells are positioned in such a way that their surfaces of thermal exchange are approximately perpendicular to the outflow direction of the internal fluid. The thermoelectric cells are positioned on both faces of a flared flange radailly clamped onto the duct. An electric generator having these features provides increased electrical power and greater depth operation.