But powering up a coal station takes half a day, so electricity companies get their baseload from coal or nuclear sources and rely on something else to handle variations in demand.

• 但是让燃煤发电厂运作起来需要花掉半天时间，所以电力公司把煤炭和核能作为基载电源，同时使用另一些能源以备不时之需。