Abstract
For electric power suppliers, the stability of power supply is a most important and keen issue. Regarding this, a power grid generally becomes more stable with an increase in size. In addition, a grid is more robust when it takes the form of a circle than when it is one-directional. On this point, Japan is not a good country to maintain a stable power grid for many reasons. First, Japan is a small but long archipelago. While its length reaches about 3500 km, its width is only 300 km at the widest point. Secondly, two different commercial power frequencies are used; western Japan uses 60 Hz, while the eastern half uses 50 Hz. Thirdly, Japan is an isolated country surrounded by the Pacific Ocean, Japan Sea, Sea of Okhotsk, East China Sea, and Philippine Sea. Fourthly, building a large international circular power grid is also difficult because of geopolitical situations.
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