A power converting apparatus that may increase a generation efficiency by receiving a power from a power source, producing electricity by rotating an output shaft connected to a generator using a portion of the received power, accumulating a remaining portion of the received power in an energy storage device, and rotating the output shaft using the accumulated energy when a power is not transmitted from the power source, the power source that floats in the ocean, performs irregular motions in vertical and horizontal directions by waves within a predetermined range, and generates an intermittent linear power, is provided.

A system for generating electricity in a moving water environment, including a single point of contact securing mechanism in contact with a floor of the moving water environment, the securing mechanism comprising a weight and a cable, a pump including a bottom section mechanically coupled to the securing mechanism via the cable, the bottom section comprising a water input valve and a bottom water conduit, a top section slidably coupled to the bottom section, the top portion comprising a water output valve and a top water conduit receiving water from the bottom water conduit, a spring mechanism coupled to the bottom section and the top section, and a buoyancy device coupled to the top pump section.

The disclosure relates to a high efficiency, low maintenance, simple, pressure receptacle wave energy converter device comprising a converter/generator unit such as a flywheel aided generator (which is located, in use, on a floating body), a buoyancy aided pressure receptacle unit located, in use, below the surface of the water, and a means of connecting/tethering the pressure receptacle with the converter. The device permits the capture of buoyant wave energy imparted to the pressure receptacle and the conversion of the captured energy into electrical energy thus directly producing or storing electrical energy from the captured kinetic energy of the waves.