Calm sea but the turbines are still turning, albeit slowly!
Under windforce 30kmh they need to be powered up, so they consume elektra.
They connect a whole park to the grid, but a section is also "reverse" connected.
Below 30kmh they wont even start up to 85kmh, so they need a "boost", from standing still.
So a small section is also routed as engines, consuming power.
When they are ideal, they just turning, when extra power (wind) is coming that can start up the other section, and so on.
So when a field is made out of lets say 10 sections, one section is always on power to turn.
When wind is strong enough and they become self sufficient they will power up the next section.
Until all sections produce enough power to feed the grid.
Thats why they are turning.
Sorry to kill your green dream, but sometimes it is worth the effort to spend some energy to make energy.