Heating of bituminous fuels in the absence of air at a temperature above 900 ° C in order to extract the gas and liquid decomposition products with gas recovery from coke ovens (coke gas) of high temperature (metallurgical coke ), and all high temperature tar (see Liquid and gaseous fuels).

Solid residue obtained from coking coal at temperatures above 1000 ° C or lignites at temperatures above 900 ° C.

Voltage whose value between phases is equal to or greater than a given voltage, variable from country to country. In many countries in Europe, high voltage is understood to be voltage greater than 1000 volts.

Electrical installation used for the coupling of two interconnected asynchronous networks, in which rectifiers and corrugators are located in a common building.

Electrical installation required to carry direct current (rectified) and connections to the interconnected network. High voltage direct current transport is distinguished over long distances from the high voltage direct current coupling.

Electrical installation that rectifies the electric current produced at a plant or from an interconnected network, transports it to long distances by means of lines or cables (submarine cables) and reinjects it into an interconnected network after conversion.

Turbines of a horizontal axis rotor. Generally, this propeller type.

Time is a unit of time, time interval, duration, equal to 3600 seconds (or 60 minutes).

Content in water of the fuel, expressed as a percentage of mass and referred to the hydrated fuel. - Total Humidity: Sum of surface water with water of constitution. - Analysis Humidity: Percentage of water of the fuel, determined at the moment of the analysis. - Retention Power: Fuel water content, determined at steady state at a temperature of 30 ° C and for relative air humidity of 96 to 97% (see Water Content).

Year based on statistical criteria, where the watercourse has higher than average flows.

Thermonuclear reactor in which the high energy neutrons from the fusion reactions cross a set of fertile materials and produce fissile materials that can be used in conventional spinning reactors.

A solar cell comprising a cooling system in which the thermal energy captured by the cooling medium is recovered and used

Exploration method in which coal is plucked by a jet of high pressure water. In the same way, the water is used to remove the charcoal uprooted to the receiving places, and can be transported by hydromechanical means to the surface.

Potential and kinetic energy of water.

Installation in which the mechanical energy of water is converted into electrical energy.

Relation between inflows in the observed period and inflows corresponding to the same period in the average year.

The use of the kinetic and potential energy of the waters by the Humanity dates back to immemorial times, since there have always been installed various devices in the banks and in the beds of the rivers. However, in the nineteenth century, the use of this form of energy became more economically attractive because, with the invention of the turbine-generator groups and the possibility of transporting electricity over great distances, it was possible to obtain A high economic yield of this use. Hydroelectric energy is thus, at present, the most important form of renewable energy; The storage of water in reservoirs allows its use with adequate regularity, and this storage can be improved as the pumping installation. The ecological impact of this form of energy is almost exclusively limited to the occupation of land resulting from the existence of reservoirs. The watercourses do not cause significant ecological impacts.

Hydroelectric Central in a watercourse, without regulatory reservoir of significant volume. Note: They may be installed in the same river or use flows diverted from their course to reach the height of the step.

Indicator that allows to quantify the deviation of the total value of energy produced by water in a given period, in relation to that which would occur if an average hydrological regime occurred.