Wind turbines linked to rising bat mortality in US study

A comprehensive study published in the Proceedings of the National Academy of Sciences reveals a significant increase in bat fatalities caused by wind energy facilities in the United States. Between 1981 and 2024, an estimated 18.7 million bats from 28 different species died due to turbine collisions.

The research highlights a dramatic upward trend: while annual deaths were approximately 100,000 two decades ago, the figure rose to 1.5 million per year by 2021, a surge attributed to the rapid expansion of the wind energy sector. Scientists are investigating why bats are drawn to these structures, with theories suggesting they may be attracted by the whirring noise or mistake the turbines for trees.

Researchers noted that previous estimates may have been too low because mortality data often relied on operator-led searches, which can be inconsistent. Factors such as scavengers removing carcasses or tall grass hiding remains may have led to undercounting. The study suggests that strategic changes to the placement of wind farms, particularly avoiding areas near rivers where bat activity is high, could help mitigate these ecological impacts.