System and method for power transmission of sea wind farm

PURPOSE: A transmission system of a marine wind plant and a method thereof are provided to reduce costs for installation, maintenance, and repair of a submarine cable by transferring electricity produced on the sea to a land using an electricity carrier. CONSTITUTION: A wind turbine (100) stores electricity which is produced by wind in an energy storage facility. An electricity carrier (200) comprises multiple ships. The multiple ships collect the electricity which is stored in the energy storage facility. The electricity carrier transfers the electricity which is collected by the multiple ships in a wind plant to a land. A land electric power substation (300) converts the electricity which is distributed from the electricity carrier into an alternating current (AC) power and supplies it to a system. [Reference numerals] (AA) Grid