About WREN

Working Together to Resolve Environmental Effects of Wind Energy (WREN)


Knowledge Base
Access thousands of publications and
more, all in a searchable database.



WREN (Working Together to Resolve Environmental Effects of Wind Energy), also known as Task 34, was established by the International Energy Agency (IEA) Wind Committee in October 2012 to address environmental issues associated with commercial development of land based and offshore wind energy projects. As the operating agent for WREN, the United States (US) leads this effort with support from the National Renewable Energy Laboratory (NREL), the Pacific Northwest National Laboratory (PNNL), and the US Department of Energy's (DOE) Wind Energy Technologies Office (WETO).

The primary objective of WREN is to facilitate international collaboration and advance global understanding of potential environmental effects of wind energy. To support this effort, Tethys was expanded to serve as a collaborative outreach and engagement space, and to disseminate knowledge and information. While most WREN information and content is publicly accessible, some space is reserved for WREN member nations for collaborative work, under password-protection.

To access member-only material, visit the WREN Members Page.

Countries Currently Involved in WREN (13):

Belgium FlagCanada FlagFrance FlagIreland FlagItaly FlagNetherlands FlagNorway FlagPortugal FlagSpain FlagSweden FlagSwitzerland FlagUnited Kingdom FlagUnited States Flag

WREN White Papers & Publications

WREN is producing a series of white papers that address common problems facing wind and wildlife interactions, for which solutions are often elusive, and that do not fall within the purviews of industry, regulators, or researchers. The list of white papers is available below. As each paper is produced, it will be made available on Tethys. Each white paper is also summarized into a 2-page fact sheet, also available on Tethys. The summaries are translated into additional languages, representing the WREN network. The following are completed or planned:

WREN Short Science Summaries

WREN seeks to summarize the current state of the science on interactions between wind energy development (land-based and offshore) and wildlife. A series of short science summaries are being prepared and made available for download on Tethys:

Harbor Porpoises Short Science SummaryEuropean Wolves Short Science SummaryBat Short Science SummaryEuropean Grouse Short Science SummarySoaring Birds Short Science SummaryWhite Stork Short Science SummaryNon-indigenous Species Short Science SummaryTethys Wind Fact SheetWREN PosterRaptor Collision Risk Short Science SummaryBats and Barotrauma Short Science SummaryMitigation Hierarchy Short Science Summary

Wind Monitoring and Mitigation Technologies Tool

As part of its mission to support the global deployment of wind energy through a better understanding of environmental issues, WREN has created a free, online Wind Monitoring and Mitigation Technologies Tool to catalog technologies that assess and reduce potential wildlife impacts resulting from land-based and offshore wind energy development. WREN will continuously maintain and update the research status of technologies to ensure the international community has access to current, publicly available information on monitoring and mitigation solutions, their state of development, and related research on their effectiveness.

Offshore Wind Metadata

WREN partnered with the Tethys team to create a catalog of environmental monitoring at offshore wind project sites around the world. Each offshore wind farm lists a description, timeline, characterization of the environment, environmental monitoring reports, monitoring data, and details on monitoring conducted during baseline, construction, operation, and decommissioning. Information is vetted by project developers, when possible, and will be updated on an annual basis.

WREN Webinars

WREN hosts webinars on the environmental concerns that are of importance to the land-based and offshore wind energy industries, as a means to effectively disseminate new information and research efforts to a large international audience of stakeholders. You can sign up to receive invitations to webinars here.

Presentations from past wind energy webinars are hosted on Tethys, along with the associated video, as well as questions and answers. Visit the archive.

Knowledge Base and Map Viewer

Tethys has collected over 3,600 documents related to the environmental effects of wind energy (land-based and offshore). All documents are available in a table format via the Tethys Knowledge Base, which can be easily filtered to find documents relevant to specific searches such as document type, technology type, or environmental effect. Any documents related to a spatial location have been geotagged and made available on the Tethys Map Viewer (note: the Map Viewer contains only a subset of the documents available in the Knowledge Base).

WREN Meetings

As an international initiative with 13 countries participating, in-person meetings among WREN country representatives are an important aspect as we work together to achieve the goals of WREN. These meetings occur twice a year, often in conjunction with related international conferences. The following is a list of all WREN meetings – both past and upcoming:

  • WREN 2023 Meeting - Virtual: 22 May, 1 June, & 5 June 2023
  • WREN 2022 Meeting - Virtual: 1 & 12 December 2022
  • WREN 2022 Meeting - Virtual: 23 May and 2, 8, & 14 June 2022
  • WREN 2021 Meeting - Virtual: 1, 2, & 8 December 2021
  • WREN 2021 Meeting - Virtual: 2, 7, & 9 June 2021
  • WREN 2020 Meeting - Virtual: 9 September 2020
  • WREN 2020 Meeting - Virtual: 3, 9, 11 June 2020
  • WREN 2019 Meeting - Washington DC, US: 22 October 2019
  • WREN 2019 Meeting - Inverness, Scotland: 28-30 May 2019
  • WREN 2018 Meeting - Tarifa, Spain: 6-8 November 2018
  • WREN 2018 Meeting - The Hague, Netherlands: 23-25 May 2018
  • WREN 2017 Meeting - Estoril, Portugal: 4-5 September 2017
  • WREN 2017 Meeting - Gotland, Sweden: 14-15 June 2017
  • WREN 2016 Meeting - Broomfield, US: 28-29 November 2016
  • WREN 2016 Meeting - Dublin, Ireland: 4-5 April 2016
  • WREN 2015 Meeting - Bern, Switzerland: 21-22 October 2015
  • WREN 2015 Meeting - Berlin, Germany: 13 March 2015
  • WREN 2014 Meeting - Denver, US: 2 December 2014
  • WREN 2014 Meeting - Newcastle, UK: 15-16 May 2014
  • WREN 2013 Kick-Off Meeting - Trondheim, Norway: 3-5 December 2013

WREN Partners

Tethys supports collaborative interactions among researchers, developers, regulators, and stakeholders for responsible development of wind energy. Notably, the IEA Wind’s WREN initiative is supported by Tethys. Below is a list of strategic project partners with WREN:

Partner Description
DOE logo

The US DOE's mission is to ensure America’s security and prosperity by addressing its energy, environmental and nuclear challenges through transformative science and technology solutions. The Office of Energy Efficiency and Renewable Energy's Wind Energy Technologies Office and Water Power Technologies Office supports Tethys and views Tethys as one of their major outreach programs. DOE is a US federal partner in WREN.

BOEM logo

The Bureau of Ocean Energy Management (BOEM) is an agency within the US Department of Interior that promotes energy independence, environmental protection and economic development through responsible, science-based management of offshore conventional and renewable energy and marine mineral resources. BOEM is a US federal partner in WREN.

NOAA logo The National Oceanic and Atmospheric Administration (NOAA) is a scientific agency within the US Department of Commerce focused on the conditions of the oceans and the atmosphere. They conduct daily weather forecasts, provide severe storm warnings and climate monitoring to fisheries management, and support coastal restoration and marine commerce. NOAA is a US federal partner in WREN.
US Fish and Wildlife Service Logo The US Fish and Wildlife Service (USFWS) is a federal agency located within the US Department of Interior, and is intended to manage fish, wildlife, and natural habitats. Some of the USFWS responsibilities include enforcing wildlife laws, protecting endangered species, protecting migratory birds, restoring nationally significant fisheries and conserving and restoring wildlife habitat. USFWS is a US federal partner in WREN.
International Energy Agency - Wind Logo IEA Wind is the implementing agreement for co-operation in the research, development, and deployment of wind energy systems. Founded in 1977, the IEA Wind Agreement sponsors cooperative research tasks between the 23 member nations and organizations, and provides a forum for international discussion of research and development issues. Task 34 (known as WREN) deals with the environmental effects of wind energy and is hosted on Tethys.


The United States Geological Survey (USGS) is a scientific agency within the US Department of the Interior, and provides science about the natural hazards that threaten lives and livelihoods; the water, energy, minerals, and other natural resources we rely on; the health of our ecosystems and environment; and the impacts of climate and land-use change. USGS is a US federal partner in WREN.


History of WREN

WREN began in 2012 and currently within its third phase, as summarized below.

Loading Data...

Phase 1: 2012-2016

The goal of WREN is to facilitate international collaboration that advances global understanding of environmental effects of offshore and land-based wind energy development, though the formation of a community of practice around research, monitoring and management of the environmental effects of wind energy development. Two key products were developed during phase 1: 1) Tethys was expanded to include land-based wind and host WREN activities and 2) a white paper focused on adaptive management.

Partner Nations (7):

Germany FlagIreland FlagNetherlands FlagNorway FlagSwitzerland FlagUnited Kingdom FlagUnited States Flag


Phase 2: 2016-2020

The second phase of WREN included the expansion of Tethys, development of several white papers, continuation of the webinar series, and outreach and engagement efforts. All these activities were aimed at contributing to supporting the expansion of land-based and offshore wind energy deployment.

Partner Nations (10):

France FlagGermany FlagIreland FlagNetherlands FlagNorway FlagSpain Flag Sweden FlagSwitzerland FlagUnited Kingdom FlagUnited States Flag


Phase 3: 2020-2024

The objective for the third phase of WREN is to assess the global state of the science related to the environmental effects of both offshore and land-based wind energy development. Over the course of the third phase, WREN will: (1) Identify priority international needs for further research related to the environmental effects of wind energy development; (2) Aggregate, synthesize, and disseminate information on the global state of the science on high-priority issues and recommended practices within the wind energy industry; and (3) Assess the technical readiness and effectiveness of solutions and explore the feasibility of transferring technologies and methodologies among jurisdictions.

Partner Nations (13):

Belgium FlagCanada FlagFrance FlagIreland FlagItaly FlagNetherlands FlagNorway FlagPortugal FlagSpain FlagSweden FlagSwitzerland FlagUnited Kingdom FlagUnited States Flag


Contact Information

Any questions related to WREN can be directed to the following individuals, who are leading the initiative: