Wind Farms Clash With Radar: Defense Concerns Rise

Pentagon officials have recently blocked reviews for 150 onshore wind farms, citing national defense and radar interference concerns. Wind turbines pose two main issues for radar systems: steel support towers can reflect electromagnetic waves, and rotating blades create a 'blade flash' effect, mimicking false objects. These issues affect both ship-based and ground-based radar systems. Despite these challenges, researchers emphasize that the problem is manageable. Experts have been collaborating for over 15 years to address interference.

New technologies and adjusted siting offer solutions. Modern solid-state radar systems can filter out blade disturbances, and turbine blades can be coated with radar-absorbent materials. Additionally, optimizing tower and blade design can minimize radar reflection. A 2024 Energy Department report highlighted successful integration of wind energy with federal radar missions. The Government Accountability Office has also studied offshore wind farms' impacts, finding solutions like restricted areas or temporary turbine shutdowns during military operations.