The document provides an overview of an underground gas storage course. The 5-day course covers technical, regulatory, and commercial aspects of underground gas storage through lectures, discussions, and a case study. Participants will learn about new storage technologies and opportunities, different storage facility types, planning and cost analysis, and perspectives of various stakeholders in liberalized gas markets. The goal is to help professionals optimize underground gas storage and incorporate it effectively into flexible gas supply strategies. The course is taught by gas industry and academic experts and results in a certificate from the University of Groningen.