The aim of this chapter is to discuss the methods of assessing the advantages and drawbacks of energy-efficient technologies (EET) as well as projects. It is a proven fact that in specific situations and well-chosen energy efficiency (EE) proposals, benefits significantly outweigh drawbacks. However, it is important to mention the perceived and actual disadvantages and complications. In the present chapter, both these aspects are discussed from the perspective of the governments, businesses establishments and households. As the scope of investigation is a global one and the resulting drawbacks as well as benefits emerge out of a specific situation, this chapter should be understood as giving directions of thought rather than empirical evidence. The purpose of this chapter is to help the reader decide which EE programmes would give positive effects, and which would not, based on which he can learn to discriminate between alternative EE proposals.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.