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**Chapter 0**

**Chapter 17**

**Energy Efficiency in the ICT - Profiling Power**

**Consumption in Desktop Computer Systems**

Giuseppe Procaccianti, Luca Ardito, Antonio Vetro' and Maurizio Morisio

Energy efficiency is finally becoming a mainstream goal in a limited world where consumption of resources cannot grow forever. ICT is both a key player in energy efficiency, and a power drainer. The Climate Group reported that the total footprint of the ICT sector was 830 MtCO2e and that the ICT was responsible for 2% of global carbon emissions [13]. Even if energy efficient IT technologies were developed and implemented, this figure would still grow up at a rate of 6% per year until 2020. Recently, much of the attention in green IT discussions focuses on data centers. However, it is foreseen that data centers will only add up to less than 20 percent of the total emissions of ICT in 2020. The majority (57 percent) will

This is because of the enormous number of machines used by individuals and businesses: it is estimated there will be 4 billion PCs in the world by 2020. So the vast number of PCs is going to dominate ICT energy consumption. Finding precise figures of the current energy consumption of computer systems and ICT equipment is essential, in order to understand how to reduce their power consumption and improve their energy efficiency. Today these

and reproduction in any medium, provided the original work is properly cited.

©2012 Procaccianti et al., licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly

© 2012 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution,

Additional information is available at the end of the chapter

come from PCs, peripherals, and printers, as shown in Figure 1 [13].

**Figure 1.** The 2020 global footprint by subsector

figures are incomplete and not precise.

cited.

http://dx.doi.org/10.5772/48237

**1. Introduction**

Ye, F.; Zhong, G.; Lu, S.; Zhang, L. (2005). GRAdient Broadcast: A Robust Data Delivery Protocol for Large Scale Sensor Networks, *ACM Wireless Networks*, vol. 11, pp. 285–298, 2005.

ZIGBEE (2007). *ZigBee PRO Specification*, ZigBee Alliance.
