Tokyo Electric Power Company Holdings, also known as Toden or TEPCO, is a Japanese electric utility holding company servicing Japan's Kant? region, Yamanashi Prefecture, and the eastern portion of Shizuoka Prefecture. This area includes Tokyo.Electricity is the essential energy to support economic and cultural activities. TEPCO will play an important role in our society by generating and supplying power.TEPCO is supporting a research and development (R&D) program aimed at providing guaranteed safety.