Large-scale participation from the public is essential for the development of energy policies that are effective, efficient, and sustainable. Public involvement in the policymaking process improves the openness, legitimacy, and social acceptance of energy policies. Nonetheless, the level of public participation in the development of energy policy varies considerably among countries and regions. This research looks at the impact of public engagement on energy policy using case studies in Germany, the United States, and China. This paper employs a case study comparison approach to analyze the benefits and drawbacks of public participation in energy decisions. Both theoretical and empirical approaches to the literature on public engagement with energy policy are discussed. The majority of the data was gathered via in-depth interviews with experts on energy policy, government officials, and representatives of civil society in the countries of concern. The information was examined via a thematic lens. According to the research, public participation in the development of energy policies may increase their social acceptability, legitimacy, and transparency. The shift to a more sustainable energy system may be aided by the discovery of novel and more effective policy choices, which can be uncovered via this process. The research did, however, point out a number of obstacles and restrictions to public participation, including a lack of resources, the difficulty of juggling multiple interests, and the possibility of conflicts. The amount and character of public participation in energy policy-making varies greatly among nations, as shown by the comparative study of case studies, reflecting disparities in political, social, and economic conditions. For instance, Germany's energy transition has been successful in part because of the country's long-standing system of public participation in energy policy. However, public participation is restricted in China's energy policy-making process, which has contributed to widespread mistrust and hostility to energy policies. The report finishes with a discussion of the results' implications for energy policy-making and ideas for increasing public participation in this area. Sustainable, democratic, and socially equitable energy policies are promoted in the research by emphasizing the necessity of public participation in the policymaking process.