Coal

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

Add a new term

Contributors in Coal

Become a Contributors

Coal

Uranium ore

Energy; Coal

Rock containing uranium mineralization in concentrations that can be mined economically, typically one to four pounds of U3O8 per tonne or 0.05 percent to 0.2 percent U3O8.

Other unavailable capability

Energy; Coal

Net capability of main generating units that are unavailable for load for reasons otherthan full-forced outage or scheduled maintenance. Legal restrictions or other causes make these units ...

Receipts

Energy; Coal

*Deliveries of fuel to an electric plant *Purchases of fuel *All revenues received by an exporter for the reported quantity exported *Also see Received.

Spot market (natural gas)

Energy; Coal

A market in which natural gas is bought and sold for immediate or very near-term delivery, usually for a period of 30 days or less. The transaction does not imply a continuing arrangement between the ...

Reactive power

Energy; Coal

The portion of electricity that establishes and sustains the electric and magnetic fields of alternating-current equipment. Reactive power must be supplied to most types of magnetic equipment, such ...

Spent fuel disassembly hardware

Energy; Coal

The skeleton of a fuel assembly after the fuel rods have been removed. Generally, SFD hardware for PWR assemblies includes guide tubes; instrument tubes, top and bottom nozzles; grid spacers; ...