Killing adapters does save energy?

Although I still had to remove 2 DC adapters (of 11), today I saw that the power usage between 04:00 and 05:00 was 258W. I hadn’t seen such a low usage for quite some time, so I did some research by querying the hourly power usage data I have been collecting since 2008. How many times did I have a power usage <= 258W during all those years? Here’s the result:

Year    Number of times <= 258W
2008    15
2009    75
2010    60
2011    0
2012    1

I expected this trend, cause 2008 has been the year where I ditched 3 (or was it 4) older PC’s which were on 24/7 by virtualization and also took some other measures to reduce power consumption. 2009 was the year in which we benefited the most from this power reduction but since then, I guess it’s the ever increasing amount of power consuming hardware that made the base power usage (as in during the night, where as much hardware as possible is turned off) increase through the years. The power usage drill-down charts I made in the past confirm all this.

I checked when the last time was when we had a nightly power usage below 258W and it was 16-03-2010! More than 2 years ago… this is no coincidence, and I can think of only 1 thing that can be responsible for matching those 258W last night, after a very long time: reducing the number of adapters.

What else could it be?

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