In the contemporary field of materials science, nanoparticles have emerged as a prominent catalyst for pioneering advancements in the energy industry. In advanced materials, three-dimensional (3D) nanomaterials have emerged exhibiting a range of exceptional characteristics that are significantly influencing the methods of energy generation, storage, and transformation. This chapter discusses the increasing importance of 3D nanomaterials in the context of energy. 3D materials possess complex nanoarchitecture, a large surface area, and configurable features, making them essential for a wide range of applications in the field of energy. Furthermore, the chapter provides a comprehensive examination of the synthesis and fabrication techniques utilized in the production of 3D nanomaterials. This highlights the adaptability and usefulness of these methodologies, while also acknowledging the obstacles that researchers face in their efforts to expand production. Furthermore, we elucidate the smooth integration of 3D nanomaterials into the domain of energy storage, specifically highlighting their crucial functions in supercapacitors and batteries. This chapter provides significant insights for individuals who are interested in the convergence of nanomaterials and energy applications, based on the most recent research findings.