Reflexivity is a critical practice in research, enabling scholars to examine the interpretive, political, and rhetorical dimensions of their work. This perspective paper explores the role of reflexivity in the study of energy transitions, where implicit assumptions often shape research trajectories and outcomes. Drawing on Susur and Karakaya's (2021) typology, we analyze hidden assumptions across three empirical contexts—aviation, electricity networks, and bio-energy carbon capture and storage. Our reflexive practice reveals common biases, including a tendency towards techno-optimism, the delimitation of spatiotemporal boundaries that may overstate technological viability, and an implicit normalization of capitalist logics that may reinforce social inequities. We argue that a deliberate, iterative approach to reflexivity enhances the robustness of research on sustainability and energy transitions, helping to uncover taken-for-granted worldviews, definitions, and methodological choices. By sharing our own reflections, we seek to encourage greater reflexivity in energy research, fostering more nuanced, critical, and inclusive approaches to addressing today's complex and wicked problems. We conclude by offering recommendations on how reflexivity can be systematically integrated into the research process to strengthen both analytical depth and transformative potential.