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Coal
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Industry: Energy
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Coal
損失的服務 （15 分鐘）
Energy; Coal
對於大於 15 分鐘由一個電動的實用程式，總金額超過 200 堅定負荷的服務中的任何損失兆瓦或 50%的總負載所提供在事件發生之前，低者為准。但是，達到了峰值的實用程式載入在以前年度超過 3000 MW： 報告損失的服務，以堅定的負荷合計超過 300 兆瓦的大於 15 分鐘。(美國能源部應通知服務恢復，並在任何情況下，在三小時內開始中斷後。） ...
