This study explores strategies to increase public participation in Community Energy Storage (CES) in Indonesia by analyzing the perspectives of managers from two prominent Solar EPCs. Using a comparative qualitative approach, the research identifies four critical pillars for enhancing citizen engagement: trust, active involvement, education, and acceptance factors. Results indicate that fostering trust requires a synergy between regulatory and economic certainty and technical reliability. Furthermore, citizen engagement must evolve from passive consumption toward "prosumerism," necessitating social engineering to integrate CES into communal social identities. The study also highlights a dual-track education strategy: targeted outreach for early adopters and structural integration into national curricula for long-term cultural change. Finally, citizen acceptance is driven by a balance between moral environmental norms and pragmatic values such as cost-efficiency and after-sales service. This paper concludes that Indonesian Solar EPC managers must shift from purely technical approaches to socio-technical strategies. By combining economic incentives, tailored communication, and reliable service, providers can effectively transform citizens from "bill payers" into active energy stakeholders.