Energy from water can be obtained not only from rivers, but also from the tidal changes and ocean waves. However, these technologies are not used in Latvia. Tidal energy technologies are like hydroelectric power plants (HPPs). Dams with turbines are installed in the defined intertidal zones. As the water recedes from the shore or, conversely, as it approaches, the turbines are turned, and electricity is generated. To avoid the need to build dams, such tidal technologies have been developed that resemble submarine wind generators. Like turbines in dams, they are turned and generate electricity because of the water flow.

Wave energy technologies most often look like large buoys. These buoys vary in appearance and construction depending on where the energy will be generated: on the coastline, on the coast or on the high seas. Any wave energy conversion device moves with the oscillations of the water surface, converting the mechanical energy of the oscillations into electricity.

It would be most advantageous to generate energy from the waves on the shoreline or on the coast, moreover, it is available more than 300 days a year. The use of wave energy is mostly limited by availability, as it is only economically viable to extract on 2% of the world’s total coastline.