UHV (Ultra High Voltage) technology can efficiently provide large amount of electric power to a distant place. Since 1970s, Japan has developed its small-sized but high quality UHV technology, and constructed UHV transmission routes. Also, this technology has been introduced in China as its power demands have grown. In May 2009, the Final Draft for International Standard (FDIS) which includes 1100 kV voltage was approved as the new edition of IEC-60038 (Standard Voltage). This paper introduces an outline of UHV technology, and explains the strategy and actions to achieve its international standardization.%最高電圧1100kV のUHV 送電は，従来よりもさらに高電圧で送電することで，発電所でつくられた大容量の電力を，より低損失で遠隔地まで届けることができる超高圧送変電技術である．また，東京電力を中心に，日本が約30年をかけて開発及び送電ルート構築を進めてきた日本発の電力技術でもある（図1）．
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