We provide you with general information about the Rules for Supply of Electricity that specify the terms and conditions of a contract between customers and TEPCO, as well as some instructions for the use of electric service and for electricity-related trouble. If you have any questions about electricity supply service, please don't hesitate to contact us. A Guide to Electricity (PDF version 652KB) The electricity we deliver to you is transmitted at a normal voltage of 100 or 200V and at a frequency of 50 Hz. If you use foreign-produced electrical appliances from abroad, be sure to check their indicated voltage and frequency to see if they are suitable for use in Japan.