Since the mid 70s the entire world has suffered a serious energy problem. 

All countries endure the imperious need to have at their disposal abundant and cheap electricity in order to sustain their productive sectors and foster the economic and social development of their populations.

As a consequence, nations face a constant growth of electric demand, which forces them to invest in new generating plants, that by far, surpass their financial possibilities.

Meanwhile, the growth in consumption of primary energy sources increases their prices and above all, augments the damage to the environment brought about by the indiscriminate burning of fossil fuels.

The growing globalization of the economy should be added to the previous circumstances, which imposes, on those who try to place their products in the market, the need to increase their efficiency and competitiveness; improvements that are possible by the elimination of waste in their production processes, in materials as well as in labor, and in the use of energy, specially in electric energy, which is a key intake that affects substantially the costs of operation and on productivity. (Fig. 1)

The need to efficiently use electric energy, even though is accepted as a slogan, is not always put into practice, never the less the economic penalizations implicit in paying for something expensive that is not used.

Figure 2 shows what has been mentioned. Particularly, it is frequent that for different reasons, the most efficient technologies available are not used.