Tohoku (Japanese Japanese: Tohoku Electric Power Company, Inc.; Japanese: Tohoku Electric Power Company, Inc.) is a well-known Japanese energy supplier, specializing in providing electricity to six Listed on the first section of the Tokyo Stock Exchange in September 1951, Tohoku is a well-known Japanese energy supplier, specializing in providing electricity to six prefectures in the Tohoku region and Niigata Prefecture in Japan; Listed on the first section of the Tokyo Stock Exchange in September 1951; headquartered in Sendai City, Miyagi Prefecture.