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# The US wind-turbine bat toll is an estimate measured in millions
- URL: https://intelligence.wildlandseco.com/2026-11-01-bat-wind-energy-fatalities-national-hindcast/
- Published: 2026-11-01T14:35:39.000Z
- Updated: 2026-11-01T14:35:39.000Z
- Description: A national model merging 499 monitoring reports estimates about 18.7 million bat fatalities across ten species from 1981–2024.
- Author: Benjamin Worlund
- Tags: Wildlife, Governance, Methods, #ecological-intelligence, #brief-2026-11-01, #priority-read, #peer-reviewed, #geo-north-america

Evidence

Peer-reviewed

Geography

Contiguous United States, 1981–2024

System

Wind farms and migratory bat mortality

## WHAT THE EVIDENCE SAYS

A multispecies Bayesian analysis synthesized 499 post-construction monitoring reports and estimated approximately 18.7 million fatalities across ten bat species, with strong effects for hoary, eastern red and silver-haired bats. Turbine design, land cover and proximity to rivers were associated with species-specific modeled risk.

## WHY IT MATTERS / OUR READ

Facility footprint tells little about collision exposure beyond the pad. Species-specific siting, operating rules and consistent post-construction monitoring remain important.

## CAVEATS / UNCERTAINTY

Millions are estimated deaths, not observed carcasses; extrapolation and detection errors matter, and fatalities are not equivalent to quantified population decline.

## SOURCE

PNAS — Labuzzetta et al. (26 Oct 2026)  
[View original evidence ↗](https://doi.org/10.1073/pnas.2612674123?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-11-01

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-11-01/)