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Energy efficiency in ethernet connections

I recently read an article about Energy Efficient Ethernet (EEE) how it's supposed to reduce CO2 emissions by up to 2.85 million metric tons in the US and I wanted to know how this is so, since the article did not discuss how this will be produced.  


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aburr
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Sean Stuber

Same idea as most energy efficient devices.  By using less electricity, there is less fuel consumption needed by the generators.

Less coal/gas burned means less CO2


You can find more specifics on the standard here...


http://www.ieee802.org/3/az/index.html
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Sean Stuber

I did a brief scan of the standard and it looks like savings come in two parts.

First, idle time power down.  If no information is flowing, the line goes into low power energy saving mode.

Also, devices implementing this will attempt to adjust power based on the distance needed to send a signal.
Current standards assume 100 meter minimum distance, but many installations don't require that much distance
between machines, thus the power requirements to send a  reliable signal can be reduced
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