About Annex IV

Annex IV is a collaborative partnership among member nations of the IEA Ocean Energy Systems (OES). The purpose of Annex IV is to examine environmental effects of marine energy development. Existing data on environmental effects of wave and tidal devices are dispersed in databases and reports throughout the world. Annex IV seeks to bring together information and practitioners from OES nations to understand potential effects of marine energy devices on marine animals and habitats, and to make existing information available and accessible.


Annex IV is led by the US, with the Department of Energy (DOE) as the Operating Agent, partnered with the US Bureau of Ocean Energy Management (BOEM), the US National Oceanic and Atmospheric Administration (NOAA), and the US Federal Energy Regulatory Commission (FERC). Annex IV is implemented by Pacific Northwest National Laboratory.


Phase 1: 2010-2012

Annex IV member countries collaborated to create a searchable, publically available database of research and monitoring information to evaluate environmental effects. The database, housed in the Tethys Knowledge Base, includes data from ocean energy projects, research studies and case study reports. Two international scientific workshops were held to provide input for the database and to inform the 2013 Final Annex IV Report.


Partner Nations (6):


Phase 2: 2013-2016

Annex IV was continued for a second phase, continuing the collection, analysis, and dissemination of information on environmental effects of marine energy development.  During Phase 2, additional emphasis was placed on creating a collaborative space or commons for interaction among researchers, developers, regulators, and stakeholders. Phase 2 will culminate with the preparation of the State of the Science report, and partnership with the EWTEC 2015 international conference.


Partner Nations (13):


For More Information:


Annex IV Metadata

The Tethys Knowledge Base allows users to view, filter, and further explore existing project sites and associated documents. The Tethys map shows marine energy sites and research activities around the world.


Contributing to the Annex IV Effort

This collection of international information requires collaboration with technology developers, utilities, project developers, researchers, and more. To notify us of any ongoing research studies:


Please download an Annex IV Research Study Metadata Form, populate the relevant fields and return to us via email.

Note: Returning this form implies your willingness to have the work posted on Tethys.


To notify us of new and developing project sites:


Please download an Annex IV Project Site Metadata Form, populate the relevant fields it and return to us via email.

Note: Returning this form implies your willingness to have the work posted on Tethys.


List of OES Annexes

Find Us On...

Find Tethys on TwitterFind Tethys on Facebook

Feedback Box

Reach Us

Please contact us if you would like to contribute any MHK or OSW information or research to Tethys.