Current estimated energy usage of data centers and core networks adds up to 3% of the global energy production, while only 42,3% of the population is estimated to be connected. In the last 14 years the number of Internet users has increased tenfold, especially in the period 2010-2014. According to this growing trend, Internet's energy consumption is meant to be a very critical issue in the near future. The emergence of cloud computing represented a major breakthrough in Internet technologies and in reduction of energy consumption. However, due to its centralized nature, this improvement in energy-efficiency has not been reflected in networks' consumption. In this paper, we analyze energy consumption of cloud networks, and present GRaNADA, a semi-decentralized Platform-as-a-Service architecture. Through simulations, we show an overall saving much of the energy consumed in standard centralized clouds with our approach.
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