USFWS Updates Eagle Fatality Model for Wind Facilities
USFWS Updates Eagle Fatality Model for Wind Facilities

On May 5, 2021, the U.S. Fish and Wildlife Service (“USFWS”) published its updated collision risk model (“CRM”) for bald and golden eagles at wind energy facilities.  The CRM is a complex Bayesian model the USFWS has endorsed to predict eagle fatalities at wind energy facilities seeking eagle incidental take authorization under the Bald and Golden Eagle Protection Act (“BGEPA”).  The USFWS previously published the proposed updates to CRM for public comment on two occasions, seeking input on three alternatives: (1) Use updated species-specific model inputs and use the 80th quantile of the CRM update as the initial permitted take number; (2) Use updated species-specific model inputs but use a more risk-tolerant CRM approach for the initial permitted take number for bald eagles; and (3) initiate an expert elicitation process to further refine the bald eagle model inputs.

The USFWS selected alternative 2 and elected to use the 80th quantile of the fatality distribution as the initial permitted take number for golden eagles and the 60th quantile of the fatality distribution as the initial permitted take number for bald eagles. The 60th quantile will yield a lower take estimate than 80th percentile all other things being equal. Another notable change is that the updated CRM now includes datasets specific to bald eagles; previously golden eagle datasets had been used to predict collision for both species.  The USFWS characterizes its use of CRM as an “exercise in adaptive management” and indicates that the datasets and how they are factored into the CRM will be revised and updated over time.  USFWS will post future updates on the USFWS eagle management page. The updated CRM will now be used for all eagle incidental take permits and Endangered Species Act incidental take permits where eagles are included as a covered species.

Whether or not the updated CRM will have a significant impact on eagle fatality predictions  (and, therefore, permitting, mitigation, and monitoring) for a given project will be influenced by which eagle species is modeled and the availability and quality of pre-construction use and post-construction mortality data.  Collision predictions produced by the CRM influence several components of eagle incidental take permits such as compensatory mitigation and compliance monitoring.  Nossaman is aware of dozens of eagle incidental take permit applications pending at various USFWS offices. How the updated CRM will impact eagle incidental take permit processing will become more apparent over the coming months.  Early indications are that the USFWS plans to apply the updated CRM to at least some of the pending applications. 

  • Brooke M. Marcus

    Brooke Marcus is a natural resources lawyer focused on assisting the renewable energy sector with maintaining compliance with environmental laws. She is go-to counsel for matters involving the Endangered Species Act (ESA), the ...

Nossaman’s Endangered Species Law & Policy blog focuses on news, events, and policies affecting endangered species issues in California and throughout the United States. Topics include listing and critical habitat decisions, conservation and recovery planning, inter-agency consultation, and related developments in law, policy, and science. We also inform readers about regulatory and legislative developments, as well as key court decisions.

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