Nuclear energy from inertial fusion is clean, safe and abundant, and therefore has the potential to develop into a viable option in any given energy portfolio. This publication presents the results and achievements of an IAEA coordinated research project on this topic. The project brought together experts from 16 institutions in 14 Member States to address issues relevant to advancing inertial fusion energy research and development towards practical applications. Key issues discussed include beam–plasma matter interactions, drivers options and technology as well as target fabrication technology, and inertial fusion power plant and integration.