After decades of low cost energy, the oil shocks of the seventiesraised the price of energy and call the consumers attention to thelimits of conventional energy supply, fostering the increase of efficiency in energy systems and stimulating the development of avariety of new and alternative sources of energy. Then, between1985 and 2002 some years of relief occurred in the energy market.However, in more recent times, the prices of energy have beensoaring again and the interest and concerns about energy issuesare high. Nevertheless, the rational use of energy and the reductionof energy losses are still low profile. It is important to stress thatthe energy question is not only a supply problem, but also, a de-mand hurdle to be overcome.

Autor: CARDOSO, Rafael Balbino ; NOGUEIRA, L. A. H. ; HADDAD, J. .
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