Ocean wave power is abundant in the vast majority of the world. Its harnessing offers a dependable, clean source of renewable and cost effective energy.

Ocean Power Technologies, Inc. (OPT) PowerBuoy® converts such energy to provide persistent and reliable electric power generation for marine applications.

Present incumbent solutions for applications that require persistent, long-term operation and/or require significant power are limited and costly. The PowerBuoy with its scalable, onboard battery system can act as an offshore Uninterruptible Power Supply (UPS) providing continuous power output.

PowerBuoy schematic

PowerBuoy schematic

How the PowerBuoy Works

The PowerBuoy consists of a float, spar, and heave plate as shown in the schematic to the left. The float moves up and down the spar in response to the motion of the waves. The heave plate maintains the spar in a relatively stationary position. The relative motion of the float with respect to the spar drives a mechanical system contained in the spar that converts the linear motion of the float into a rotary one. The rotary motion drives electrical generators that produce electricity for the payload or for export to nearby marine applications using a submarine electrical cable. This high performance wave energy conversion system generates power even in moderate wave environments.

The PowerBuoy’s power conversion and control systems provide continuous power for these applications under the most challenging marine conditions. The spar contains space for additional battery capacity if required to ensure power is provided to a given application even under extended no wave conditions.


OPT's PowerBuoy portfolio includes two power output ranges: up to 350 watts and up to 15 kW. (Note: Average output power is deployment-site dependent.) OPT’s products serving the offshore power needs are the PB3 and the PowerBuoy.