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The Tethys Engineering Photo Library hosts photos and illustrations of marine energy devices, test sites, and monitoring technologies that have been graciously provided by developers. These images are free for third party use, and attribution should be given to the developer rather than Tethys Engineering. If you are a developer and would like to contribute high-resolution images, please email…

The Knowledge Base provides access to information about technical and engineering aspects of marine energy. Relevant documents from around the world are compiled into a user-friendly table that displays all content available in Tethys Engineering. Results can be narrowed using the keyword filters on the right, or with search terms entered in the text box, including…

The Map Viewer provides a spatial view of information about technical and engineering aspects of marine renewable energy. Documents associated with a geographic location are compiled into an interactive map with panning, zooming, clustering, and filtering. Results can be narrowed using the keyword filters on the right, or with search terms entered in the text box. Content is clustered together…

This list compiles organizations from around the world that are involved in research pertaining to marine energy development. Clicking on the organization will direct you to a page which includes additional information on the organization as well as a list of all documents in Tethys Engineering affiliated with the organization. The organizations list is not exhaustive and will be updated as…

This list compiles and provides access to external databases. While the respective scopes of each of the databases are varied, all convey information relevant to marine energy. The list of databases is not exhaustive and will be updated as needed. If you have corrections or suggestions, please email tethys@pnnl.gov.…

The bi-weekly PRIMRE Blast is an online newsletter that highlights content from the seven knowledge hubs of PRIMRE; relevant announcements, opportunities, and upcoming events; and news articles of international interest. We hope you find this a valuable tool to keep you connected to new research, opportunities, and industry milestones. …

The Events Calendar highlights key events from around the world related to marine energy, including conferences, workshops, webinars, and more. Clicking on an event will show more information and link to the event organizer. While some of these events are hosted by Tethys Engineering, the majority are not, so queries about specific events should be sent to the event organizer. If you would…

Tethys Engineering hosts regular webinars pertaining to technical and engineering topics relevant to the industry, as a means to effectively disseminate new information and research efforts to a large international audience of stakeholders. Anyone is welcome to attend these live webinars and participate in a live question and answer session with the presenters. Information for attending these…

Tethys Engineering is a publicly accessible online knowledge base that seeks to progress the marine energy industry by making technical information widely available, both in the U.S. and internationally. Tethys Engineering hosts scientific papers, reports, and other media on current energy, wave energy, ocean thermal energy conversion, and salinity gradient technology. The content covers a…

The U.S. Department of Energy Water Power Technologies Office directed Pacific Northwest National Laboratory,…

Floating offshore renewable energy systems have several advantages: higher wind and wave resources, technically unlimited water depth, better adaptability to soil types… However, they must limit their dynamics for a number of reasons:

• efficiency (e.g., reduction in wind turbine performance if the floating structure movements are too severe),
• safety (e.g., disruption of…

Foundations and gravity anchors are large and heavy structures that are placed on the seafloor. Their capacity to resist tensile, sliding and overturning forces is proportional to their weight. France Énergies Marines developed this Fact Sheet to describe the different foundations and anchors used for offshore renewable energy systems, and compare their advantages and limitations.

Flow field results are presented for the near-wake of an axial-flow hydrokinetic turbine in the presence of surface gravity waves. The turbine is a 1/25 scale, 0.8 m diameter, two bladed turbine based on the U.S. Department of Energy's Reference Model 1 tidal current turbine. Measurements were obtained in the large towing tank facility at the U.S. Naval Academy with the turbine towed at a…

The Kuroshio flowing near Japan is one of the largest ocean currents and it is considered that this energy possibly be an important energy source for Japan. A full-scale generator with twin 40m turbine rotors is planned for at the rated flow speed of 1.5 m/s. Estimation of the blade loads are crucial for such big turbines. We focus on the effect of shear flow on an ocean current turbine and…

The goal of this paper is to investigate the influence of wave-current interaction on a tidal turbine. Experiments at the Norwegian Marine Technology Research Institute (MARINTEK, Trondheim, Norway) have been carried out, and a computational fluid dynamics (CFD) analysis has been performed to enhance the understanding of the wave-induced loads on the tidal turbine rotor. These loads are known…

OWC (Oscillating Water Column) type wave energy converter installed in a breakwater has been investigated in Spain, Portugal, Australia and Japan. The OWC unit consists of a curtain wall, an air chamber, an air turbine and a generator. An air chamber has an opening in underwater part, and a wave goes in and out through this opening. The water surface compresses the air in an air chamber, and…

The numerical methods for analyzing a terminator type wave energy conversion device are described under the condition that the linear water wave theory is applicable. Two methods are proposed to calculate the device characteristics of an Oscillating Water Column (OWC) type. One uses the flow rate and the gauge pressure in the air chamber directly, because in this system the interaction between…

The numerical methods for analyzing a terminator type wave energy conversion device are described under the condition that the linear water wave theory is applicable. Two methods are proposed to calculate the device characteristics of an Oscillating Water Column (OWC) type. One uses the flow rate and the gauge pressure in the air chamber directly, because in this system the interaction between…