NOVELTY - The apparatus (300) has load bearing structures which are adapted to experience a force from an external source. The magnetostrictive elements are arranged between the load-bearing structures, so as to experience the force transferred from the load-bearing structures and to experience a change in magnetic flux in response to the force. The electrical circuit or coil is arranged within the vicinity of magnetostrictive elements so as to generate electric power in response to the change in the magnetic flux of a magnetostrictive element.    USE - Apparatus for harvesting electrical power from mechanical energy, used in ocean applications, down-hole drilling applications, oil and gas applications, and geothermal applications.    ADVANTAGE - The magnetic circuits are coupled with electrical circuits to increase or maximize power production efficiency of the apparatus. The design of the fixture can increase the amount of load transferred to the magnetostrictive element. The external enclosure is provided in the apparatus main portion so as to protect the apparatus from external environment. The magnetic flux leakage can be reduced. The mechanical energy can be effectively converted into magnetic and electrical energy. The usage of batteries downhole can be reduced. The roller bearings in the surface of the impact head are contacted with the rock wall so that the frictional losses are reduced. The sub-scale power take-off (PTO) module is designed with significant redundancy so that the corrosion risk factor in alloys can be effectively eliminated. The reliability of the alloy rods can be improved without reducing the performance of rods. The performance of the energy producing apparatus can be enhanced while reducing the manufacturing cost of the apparatus. The optimized PTO tested in a wave tank environment can produce waves of sufficient height so as to produce stresses that are similar to stresses experienced by the full-scale PTO in an ocean environment. The service lifetime of the apparatus can be extended.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the energy harvesting apparatus.    Energy harvesting apparatus (300)    Magnetostrictive rods (302,304)