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The rise of direct current using devices and direct current generation have some rethinking the use of alternating current in the grid. Let’s start from history of electric power transmission : In the late 19th century both alternating current (AC) and direct current (DC) were both used to power devices like motors and light bulbs. Over 100 years ago, Edison and Westinghouse were on each side of the DC versus AC debate. Those systems were not interchangeable and they competed for dominance. Thomas Edison developed the first power transmission systems using DC.