Improving the nation’s competitiveness and energy security are now crucial to efficient development and use of technology in the future. The rapid increase in energy demand has accelerated the competition to secure energy. In Korea, where most energy resources are imported, the development of energy resources for the future may be the key to determining the nation’s future. The Department of Energy Systems Engineering focuses on addressing this issue by fostering global energy leaders who will develop new, environmentally friendly technology for exploiting future energy resources. The graduate school course is divided into nuclear engineering and energy resource engineering. The nuclear engineering area studies the technologies for producing nuclear energy, which has the potential to become the main source of energy in the future as well as present times. This area is further subdivided into nuclear power system engineering, plasma and fusion engineering, and radiotechnology. The energy resource engineering area is divided into energy resource development, environmental technology, and renewable energy.