Worldwide, around 1000 patents relating to the harvesting of wave energy have been taken out. But less than 20 concepts have reached a maturity where they have an actual installation and even fever have produced energy for the grid. Here are some of the more mature projects that are nevertheless still struggling. See the company websites for status, development, and videos with the respective principles.

Wave Star (Wave Star Energy). It is of the device type attenuator or linear absorber. Read more and watch the Wave Star video.

Pelamis (Pelamis Wave Power) is of the device type attenuator or linear absorber. See the Pelamis in action.

Wave Dragon (Wave Dragon A/S) is installed at Nissum Bredning in Denmark. It is of the device type overtopping terminator. See a video about Wave Dragon. 

OE Buoy (Ocean Energy Ltd.). See a video of this point absorber device and read more about the technology.

The Oyster (Aquamarine Power) is a nearshore device of the point absorber type. See video of the technology and read about the status.  

Waveroller (AW Energy). See the principles of the concept and read more.

Limpet (Voith Hydro Wavegen Ltd.) is a device of the type Oscillating Water Column (OWC). Read more about the device and see where it is installed.

OceanLinx (Oceanlinx). Find out more about this oscillating water column concept which is installed onshore.

CETO (SeaPower Pacific PTY Ltd). Find out more.

Powerbuoy (OPT Ocean Power Technologies). Learn more about the principles of the Powerbuoy.