A growing expense and impact of the Internet is its energy use. Current estimates are that 2% of electricity consumption in the USA goes to powering the Internet. In Germany it is estimated that energy consumption by IT equipment will be between 2% and 5% in 2010. The 2% estimate for the USA totals more than 74TWh/year or $6 billion per year. It is predicted that energy use of IT equipment is growing faster than energy use of any other type within buildings. Much of this energy use is wasted. Energy use by IT equipment is not proportional to utilization of the equipment.
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