About IKEDA KOICHI
About 東京電力パワーグリッド
About power transmission(electric)
About state
About DC power transmission
About power-transmission line
About plan
About Eastern Japan
About Western Japan
About electric power system
About frequency converter
About stringing construction
About geomagnetic observatory
About porcelain insulator
About latest trend
About trunk power-transmission line
About interconnection tie
About Power transmission
About Electric power system in general
About 送電
About 動向
About 直流
About 新設
About 計画
About 東日本
About 西日本
About 連系線