This article examines the role of normative power in shaping the global sustainability order. It challenges the prevailing focus on hegemonic leadership and norm diffusion from dominant states, arguing that less powerful states have contributed significantly to the global order by creating regional initiatives tailored to their unique contexts. The article adopts an alternative theoretical framework of norm-governed change, comprising norm-building, institutionalisation, and transformation. Using an illustrative case study of Africa’s regional economic institutions, it employs process-tracing and archival analysis of key policy documents. The study demonstrates how African states have proactively embedded environmental norms within their regional initiatives, while contributing to the global sustainability agenda, exemplifying a form of normative power referred to as ‘Green Pan-Africanism’. This approach broadens the understanding of global sustainability governance, positioning less economically powerful actors as active participants in world-making. The findings highlight the critical role of normative power in advancing global sustainability governance, particularly in addressing complex global challenges such as climate change.