Electricity sales originated in the19th century. Later, due to the arrival of the electric energy era, electricity sales have developed rapidly, but the electricity sales business in most countries is still owned by the state monopoly or organizations, and power customers monopolize the purchase of electricity from these places. After 1990, the United States, Britain, New Zealand and other countries opened their electricity sales business one after another, giving full play to the role of competition in the electricity market. There are electricity selling companies in the electricity market.