Wind energy is one of the key technologies to become independent of fossil fuels. Implementation of wind energy on a local level, however, has sometimes proved to be challenging and dealing with local acceptance of onshore wind turbines has become troublesome for some projects. Communication and public involvement are seen as strategies to prevent or respond to local opposition. This paper analyses the views of a variety of experts in wind energy on this matter. It focuses on eliciting their experiences with public participation measures. Furthermore, the perceived effectiveness of the measures for the social acceptance of wind energy projects is analysed. To do so, this paper draws on an expert survey among 207 individuals across Europe linked to wind energy projects. The analysis shows that negative reactions to wind farms are reported more frequently than positive reactions. In nearly 40% of cases, projects experience negative consequences on project development due to a lack of social acceptance, ranging from delays to changes in project plans and even termination. The vast majority of wind project developers respond to this by carrying out public participation activity at least sometimes. However, a much lower share does this systematically and the level of activity is low in early project phases. With regard to the relationship between project activities and project success, there is some support for the assumption that early and systematic involvement of the public and stakeholders is likely to reduce negative reactions.