Wildlife

Bat Mortality at Wind Turbines

How wind turbines threaten bat populations and what mitigation measures can protect these ecologically important mammals.

Key Facts

Hundreds of thousands of bats die at wind turbines globally each year
Bats are attracted to turbines possibly due to insect concentrations or curiosity
Many bat species have low reproductive rates, making population losses significant
Curtailment (slowing turbines during low-wind, high-bat-activity periods) reduces mortality by up to 90%
Several bat species across Europe and North America are showing population declines linked to wind energy

Welfare Considerations

Bat mortality at wind turbines is not instantaneous - many bats suffer barotrauma (internal bleeding from pressure changes) and die slowly away from the turbine site. Given bats typically produce only one pup per year, even modest mortality rates can be unsustainable for local populations. Beyond individual suffering, bat population declines have cascading ecological consequences given their role as pollinators and insect controllers.

What You Can Do

Support smart turbine curtailment policies that protect high-risk periods
Encourage wind energy developers to conduct pre-construction bat surveys
Advocate for bat-friendly wind farm siting away from migration corridors
Support bat conservation organizations and research
Install bat boxes to support local bat populations