This study investigates the relationship between communication factors, stakeholders’ engagement, and project success (P.S.) of renewable energy in Pakistan. The aim of this study is to identify the communication factors that impact the success of renewable energy projects. The research investigates multiple dimensions of communication factors such as internal communication, external communication, leadership, relationship, and corporation. Moreover, we also tested the indirect relationship using the stakeholder’s engagement (S.E.) as a mediating variable. We used a quantitative approach using the questionnaire survey. The random and snowball sampling technique was used to collect data from the project managers, project engineers, and team leaders associated with renewable projects in Pakistan. We collected data in two phases. In the first phase, between August 2023 and December 2022, we distributed 400 complete research questionnaires. In return, we received 337 questionnaires, 84% of the distributed questionnaires. Similarly, between January 2023 and February 2023, we distributed 350 research questionnaires; in return, we received 255 questionnaires, which is 73% of the distributed questionnaires. However, we collected data from the 592 respondents engaged with renewable energy projects. Further, the structural equation modeling technique (SEM) was performed to analyze the study data through SmartPLS 4.1. The outcomes confirmed that communication factors significantly and positively impact the project’s success. The results guaranteed that communication factors have a positive and significant relationship with the stakeholder’s engagement. Furthermore, the results demonstrated that stakeholders’ engagement mediates communication factors and project success, enhancing the project’s success.