Correct. Twenty plus years ago they were using Balsa; but not today.
"Most blades are made with fibreglass-reinforced polyester or epoxy. Carbon fibre or aramid (Kevlar) is also used as reinforcement material."
Reference:
https://www.iberdrola.com/sustainability/wind-turbines-blades#:~:text=What%20materials%20are%20used%3F,also%20used%20as%20reinforcement%20material.
Ann: Appeals lodged against Exploration Permit for Penikat, page-28
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