Direction according to which the exploration works of a deposit progress.

Operating method in which a continuous working machine removes the coal from the front of the load and loads it into the transport equipment. Note: In some countries continuous mining is used in the chambers and pillars method, during which a self-propelled machine pulls out the coal and carries it continuously on the transport equipment; This can be made up of transport trucks or conveyor belt.

An exploration method in which the coal is extracted from a layer so that the front of dismantling, which can reach hundreds of meters, moves along a continuous line; The void created by the extraction of the coal can be filled with debris and wastes of washing, but it is more common to allow the roof to collapse.

Implementation of storage facilities for a tidal power plant so that it can be operated in order to contribute to the satisfaction of the demand for high-end electricity in a network, within the framework of a pre-established program.

Number of days in an average year during which the flow is greater than the holding flow.

A method of mining in which holes of large diameter are made in the layer of coal, usually horizontal and extending up to 60 meters. These holes are made by a drilling rig whose cutting head consists of a hole. As the wheel rotates, the cutting head pulls out the charcoal and the worm carries it along the hole. This technique is also suitable for open-air explorations of charcoal beds, or above all When the terrain reaches a thickness that economically makes it impossible to remove it.

Natural or artificial delimitation of a specified area of exploitation where the holding is carried out or where it is planned.

Quantities of energy sold by a country outside the national territory(political and non-customs borders). Note: Export data are generally from exporters declarations; may therefore can differ from those established by the customs services in the external trade statistics.

Removal of sensitive heat from coke discharged from retorts, by means of water (wet extinguishing) or by inert gases (dry extinguishing).

Workdays in which the extraction works effectively.

Relation between total availability and duration of the reference period.

Drop height actually used by the turbines, ie the difference between the level corresponding to the head of the turbine inlet, taking into account the water height equivalent of the water velocity at that point and: It is about reaction turbines, the level of restitution plus the equivalent, in water height, of the water velocity at that point;
- when it comes to injection turbines, the average level of the injectors.

Unit of electrical capacity. The farad is the capacity of an electric capacitor between whose metallic armatures a potential difference of 1 volt arises when it is charged with a quantity of electricity of 1 coulomb. 1 F = 1 C / V

Mobile load installation on top of a conveyor belt. This car can be equipped with a hopper, a dripper or a table on rollers and / or a reversible conveyor belt.

Region surrounding the Inucleus of the fusion reactor, in which the neutrons resulting from the fusion are decelerated, with heat transfer to a primary coolant. In this region, tritium is produced from lithium.

A deposit is the set of layers of coal with a variable content and without precise delimitation which often shows a high carbon content with respect to its dimensions.

Geological formations containing resources in energy raw materials

Operation of total or partial filling of voids created by the holding.

Time required to fill the upper reservoir of a hydroelectric recovery pumping, from the minimum level of operation to the level of full storage, with the pumping system operating at full load.

Separation of solids or fluids in which the cloudy liquid is drawn or compressed through a filtration system.