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Research on organizational sustainability (OS) remains a global debate. Consequently, organizations have become increasingly interested in adopting leadership styles to drive sustainability goals. Thus, in the present study we examined the impact of green transformation leadership (GTL) on OS and its dimensions (environmental, social, and economic), focusing on the mediating role of green talent management (GTM). We employed a quantitative methodology, using questionnaires for data collection and SPSS (version 25) and AMOS (version 23) for data analysis. The sample consisted of lower-level leadership, including executive management and department heads from Egypt’s renewable energy organizations. We gathered 250 valid responses. The findings indicate that GTL has a positive impact on OS both directly and indirectly through GTM. Also, we found that GTM mediates the relationship between GTL and OS. These findings strengthen the view that the effectiveness of GTL is fundamentally reflected in the adoption of sustainable strategies and is the cornerstone for enabling an organization to achieve OS. Our research addresses a gap in the literature by examining the impact of GTL on OS while considering the impact of GTM, which previous researchers did not consider. In addition, we provide managerial implications for renewable energy organizations as well as limitations and directions for future research.