As the world moves with increasing urgency to mitigate climate change and catalyze energy transitions to net zero, understanding the governance mechanisms that will unlock barriers to energy transitions is of critical importance. This book examines how the clean energy regime complex-the fragmented, complex sphere of governance in the clean energy issue area characterized by proliferating and overlapping international institutions-can be effective in fostering energy transitions at the domestic level, particularly in emerging market and developing economies (EMDEs). Through comparative case studies of geothermal development in Indonesia and the Philippines, the chapters provide two different tales of energy transitions, demonstrating how domestic factors have hindered or facilitated progress. This book will be useful for students, researchers, and practitioners working in international relations, energy politics, political science, development studies, public policy, international law, and sociology. This title is also available as Open Access on Cambridge Core.