A common concern about renewable energy projects is the impacts to human health. For both wind and solar developments, noise is often a primary concern from either the wind turbine blades or the inverters for a solar array - both of which do emit sound. There is not much research on the effects of solar project noise specifically, but there are many studies on the effects of wind development noise, most of which find that there are not direct impacts on human health from wind turbines. However, there is research happening on the indirect impacts of wind turbines, specifically if turbines cause stress or annoyance to surrounding residents that in turn can lead to other health problems.
Specific to wind energy, there is also concern around shadow flicker from turbines. There is evidence that flicker can negatively affect those with epilepsy, although occurrences are rare and newer turbines have the ability to move at a slower rate which lessens the impact of shadow flicker. In addition, turbines can be programmed to be shut off during the time that flicker might affect the home of someone with epilepsy.