Can electricity only be bought and sold through the power trading center?

Yes

Electricity is run by the state, and individuals can't run it, let alone use low-cost electricity. Now the country allows individuals to buy and sell electricity, so how can we buy and sell electricity in power sales companies? First of all, this electricity sales company must have the qualification to sell electricity. There are generally two ways for power selling companies to buy electricity. After registering in the provincial power trading center to obtain the qualification of market subject, bid online in the trading center. You can buy electricity from the power generation company.