电价分层在发达国家中非常明显。让我们看看日本,韩国,和美国的规划。

Tiered electricity pricing is common in developed countries. Let's take a look at the schemes in Japan, South Korea, and the U.S.

Japan’s system is divided into three tiers -- the first ranges from 0 to 120 kilowatt hours; the second from 120 to 300 kilowatt hours, and the third is anything above that. In recent years, Japan has also separated peak time rate from normal rates and is bracing for severe power shortages as it shuts down all nuclear-generated electricity.
South Korea is known for high power prices. Electricity usage for residents is divided into 6 intervals, starting as low as 55 won, or 5 US cents, per kilowatt hour and running as high as 644 won, or 56 cents, per kilowatt hour. Given the expensive prices, many South Korean families have energy saving habits.
The United States’ system is the most flexible of the three. Residents are charged higher prices in the summer, and slightly lower prices in the winter. According to statistics, the average American household electricity usage is 920 kilowatt hours per month, and an average cost of 13 cents per unit.