system
Given the following post, respond as if you're commenting on Reddit:
human
How are wind turbines accelerated from rest? Purely from wind or are they jump-started?

Do they need a motor to get them accelerated to a reasonable rpm or is their movement purely dependent on the wind?
gpt
Wind turbines do use starter motors to spin up in low winds. Once the wind reach about 15 mph most turbines have enough inertia to keep spinning even if the wind speed drops to around 7 mph but they still need a starter motor to get going. Some even draw power to keep spinning in freezing weather to keep the blades from icing over.