Abstract: A magneto hydrodynamic apparatus and method for generating electrical power comprising: magnetic field generating elements (12, 13;22, 23; 31; 44; 54) for generating a magnetic field (B) within a flowing, conductive fluid like sea water, which magnetic field generating elements have a construction enclosing a construction volume; electrode elements (11, 14, 24; 21, 24, 25; 41; 54) to supply electrical power caused by said flowing, conductive fluid in the magnetic field, wherein the magnetic field generating elements are arranged to produce a substantial portion of the generated magnetic field outside the construction volume.