In this important decision by the Ontario Environmental Review Tribune, the Tribune officially revokes Wpd Canada's permit to install eight 137-meter (450 feet) tall wind turbines in close proximity to the Collingwood Regional Airport and a private air field owned by Kevin and Gail Elwood. In its October 2016 decision, the ERT had determined that the appellants met the test that showed there would be harm to human health. The ERT also agreed that irreversible harm to the natural environment, specifically to bats, warranted further investigation. Wpd Canada was granted an opportunity to show that mitigation could resolve the concerns. The ERT in this decision held that the risk to human health and safety was unacceptable. A portion of the decision is provided below (paragraphs 15-20) pertaining to the turbines impairing safe air travel. The full decision of the ERT can be found by clicking the links on this page.