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从1999年11月起，江苏省通州市对受电量在315千伏安以上的机械、建材等6大行业的135家企业试行“峰谷电价”。即把一天分为峰、谷、平3个时段各8小时，并根据不同时段实施不同的电价。7～11点、17～21点为峰段，电价为原价的1.5倍；23～次日7点为谷段，电价为原来的一半；而11
From November 1999, Tongzhou City, Jiangsu Province piloted the “peak-valley electricity price” for 135 companies in six industries, such as machinery and building materials, which received electricity at 315 kVA. That is, one day is divided into peaks, valleys and flats for 8 hours each, and different electricity prices are implemented according to different periods. 7 to 11 points and 17 to 21 points are peak sections, and the electricity price is 1.5 times the original price; 23 to 7 days is the valley section, and the electricity price is half of the original price; and 11