If the local electric company has too much supply or very little demand at, say, 2 a. m. on a Wednesday, the utility will drop the priceperkilowatt-hour.
例如在周三夜里2点,假如当地供电公司出现电力供应太多,电力需求太少,公司就可以下调电价。
2
The price of wind power has fallen from $2 perkilowatt hour in the 1970s to 5-8 cents now, compared with 2-4 cents for coal-fired power.
风能电的价格也从1970年代的每瓦特2美元降至如今的5-8美分,而煤电也不过2-4美分。
3
This added an average of 1 euro cent perkilowatt-hour to the price of electricity last year, increasing the typical household electricity bill by 5%, or euro3 a month.