The Okinawa Electric Power Company, Incorporated, OEPC or Okiden for short, is an electric utility with its exclusive operational area of Okinawa Prefecture, Japan. It is the smallest by electricity sales among Japan’s ten regional power utilities. For comparison, its electricity sales is approximately ¹⁄₄₀ of that of The Tokyo Electric Power Company. However, it is the largest by revenue among companies headquartered in Okinawa. Wikipedia