The rapid pace of geopolitical change, the urgent necessity for sustainability, and the fundamental importance of energy security converge to shape our complex global landscape today. This issue of Transatlantic Policy Quarterly delves into "Change, Security, and Sustainability in Energy," offering insights from scholars and professionals on how regions and nations are navigating this pivotal transformation. This issue is also a testament to the diverse perspectives needed to address our global energy challenges. From Europe to Asia and the Americas, these contributors provide thoughtful analyses and innovative ideas for a sustainable, secure, and resilient energy future. We invite you to engage with these articles, each shedding light on the crucial crossroads of change, security, and sustainability in energy.