Operando materials characterization stands as a pivotal tool to unveil dynamic structural changes during the operation of devices, serving as a linchpin in the rational development of clean energy technologies such as H2 production, batteries, and fuel cells. This symposium gathers national renowned researchers from the intersecting realms of clean energy and materials characterization to engage in a collaborative exploration of advanced operando characterization techniques, employing synchrotron and electron-based methodologies. Join us for a workshop that promises to be a platform for brainstorming, knowledge exchange, and the advancement of cutting-edge techniques in operando materials characterization for the betterment of clean energy technologies.