Wave power generator

A method of generating electrical power comprising:

• a) deploying a wave power generator in a body of water, the generator comprising:
• i) a buoyant casing;
• ii) an electric machine located within the casing comprising an armature and a field source, the electric machine having a fixed part coupled to the casing and a moving part;
• iii) a counterweight assembly that is movable within the casing, comprising the moving part of the electric machine and wherein a relative movement of the counterweight assembly and the fixed part of the electric machine generates electric power;
• and
• iv) power storage that stores power generated by the electric machine;
• b) determining a bi-directional energy flow between the power storage and the armature, and
• c) returning energy to the electric machine based on the determined energy flow, to drive a motion of the counterweight assembly anti-symmetrically to a motion of the casing such that the motion of the counterweight assembly is in antiphase with and has the same amplitude as the motion of the casing.