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This paper, based on the Northeast Asia (NEA) power system interconnection, presents an integration of renewable generation (RG), demand response (DR) or distributed generation (DG), high-voltage direct-current (HVDC), and nuclear power plant load-following operation under Smart Grid (SM) in the South Korean power system. The reliable power system depends on considering the reliability that affect after the system is connected or disconnected. The land-to-land power system interconnection in NEA countries will use as the back to back (BTB) technique for power transmission lines; whereas the point-to-point (PTP) will be used for over-sea interconnection, such as a Jeju Island and South Korea-Japan submarine transmission. In this paper, we will suggest how to design and analyze the operation mechanism/algorithm of the reliability side for the NEA, and an integration of RG, DR, HVDC, and nuclear power plant load-following operation under SM in the South Korean power system. Also, we present an inter-area power flow map for a power flow analysis for NEA countries to relieve the possible future power imbalances within the metropolitan areas or the southeastern area of Korea.