Electricity generation textile factory alternator (Museum of Science and Technology of Catalonia, Terrassa). In general, electric power generation is to transform some kind of chemical energy, mechanical, thermal or light, among others, into electrical energy. For the industrial generation facilities are used so-called power stations that run one of the methods above. These are the first step of the electricity supply system. From that Nikola Tesla discovered alternating current, and how to produce it in alternators, has undertaken a vast technological activity to bring electricity to all the inhabited places of the world, so that, together with the construction of large and various power plants have been built sophisticated transmission and distribution systems. However, the use has been and remains very uneven across the globe.Thus, industrialized countries or the First World are large consumers of electricity, while the so-called third world countries just enjoy its benefits. Cattenom nuclear plant, France. The electricity demand of a city, region or country has a variation throughout the day. This variation depends on many factors, among which are: types of industries in the zone and doing shifts in production, extreme cold weather or heat, type of appliances that are more commonly used, type of water heater installed in homes, on season and time of day when demand is considered. The power generation must follow the demand curve and, with increasing power demands, it must increase the power delivered. This includes having to start additional generating units, located in the same plant or power reserved for such periods.Overall generation systems differ in the period of the cycle in which it is planned to be used, are considered basic nuclear and wind, the valley fossil fuel thermoelectric, and peak mainly hydro (fossil fuels and hydroelectric power can also be used as a basis if necessary). Depending on the used primary energy source, power stations are classified in thermoelectric, hydroelectric, nuclear, wind, solar thermoelectric, solar photovoltaic and tidal. Most of the electricity generated worldwide comes from the first three types of facilities reviewed. All these plants, but photovoltaic panels, have in common generating element, comprising an alternator, driven by a turbine that will be different depending on the type of primary energy used.On the other hand, 64 of executives from leading electricity companies consider that the horizon of 2018 there will be clean technology, affordable and local renewable generation, which will force the large corporations in the sector to a change in mentality. 1
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