system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do some wind turbines, when all faced the same direction, turn while others do not? Furthermore, why do they all seem to turn at the same speed?
gpt
They might not be turning for at least two reasons: 1) they have been commanded offline for maintenance, because the power isn't needed, ...; 2) the local wind sensor on the turbine doesn't detect the minimum wind needed to generate minimum power because or hills, wind currents, spoilage from other turbines, ... .

The wind turbine has a rotation rate that extracts the maximum energy, as a function of windspeed.  If all the turbines are made by the same company, and they are all in the same wind, then that optimization process is likely to have them turning at very similar rates.