Why do wind turbines have three blades?

Answer: Balances efficiency with stability

Balances efficiency with stability ✓ — Correct! Three blades capture wind energy efficiently while maintaining rotational balance and minimizing vibration. Two blades would be cheaper but vibrate more. Four+ blades add cost without proportional energy gain.

Three is the cheapest option — Wrong. Two blades would be cheaper (less material). Three blades are used because they provide better balance and smoother operation while still being efficient.

Government regulations require it — Wrong. While standards exist, three blades became the norm through engineering optimization—balancing energy capture, mechanical stability, cost, and noise reduction.