Recently the electric power sources are getting father and more omni-present away from demand regions and the power corporations are having difficulty in the construction of power transmission facilities. These circumstances become serious problems in ensuring sufficient power supply to the urban areas.
To cope with the difficulty in acquiring land for facilities and the limited number of roads for the underground transmission routes, 275 KV underground transmission lines are being directly introduced into the urban areas, and transformed down to 22 KV or 66 KV without intermediate steps.
In the future, problems in acquiring land for facilities and restraints of road condition for underground transmission will become so severe that it will be disired to exploit power plants in/near the urban areas.
From such viewpoint, fuel-cell is being watched with keen interest, and the research Sz development in various fields are under way.
Along with the above, UHV transmission technology is being developed to realize the unprecedented long distance bulk power transmission, and 500 KV underground transmission into the urban areas is being plannea to ensure the reliable and stable power supply.
Besides ensuring stable power supply by expanding facilities, some demand management policies should also be established and strongly implemented from the viewpoint of efficient utilization of electric power and prevention of wasting precious energy.
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