This post on the subject of growing energy usage by data centers examining a recent report on how the rate of increase in the energy usage for data centers has been quite a bit lower than was predicted. It goes on to argue that the report may not be capturing the whole picture and that important areas of energy usage by data centers have not been factored into the report.

by Julius Neudorfer, CTO and founder of North American Access Technologies, Inc. (NAAT). He has written numerous articles for various IT and Data Center publications and has delivered seminars and webinars on data center power, cooling and efficiency and is the author of the Hot Aisle Insight blog. Connect with Julius on Linkedin.

A report just released has indicated that the rise of energy usage in the data center from 2005 to 2010 was not as high as expected. The report, released Aug. 1, was written by Jonathan G. Koomey, Ph.D., consulting professor at Stanford University, and was commissioned and reported by The New York Times.

If correct, it would seem that the dire predictions of data centers being the scourge of the earth, energy-wise, may not be as high as the often-cited original 2007 EPA report to Congress, which projected as much as a 100 percent increase over the 2006 to 2011 time period.

The 24-page Koomey report was based on a series of prior reports by Professor Koomey (Koomey 2007a, 2007b, 2008b), as well as other well-documented sources. However, the underlying basis of the calculations seemed heavily focused on the number of “volume servers” shipped, as well higher-performance servers and other IT equipment (storage and networking gear), from 2010 information supplied by IDC.

Key Excerpts from the 2011 Koomey report:

Electricity used by data centers worldwide increased by about 56 percent from 2005 to 2010 instead of doubling (as it did from 2000 to 2005), while in the U.S. it increased by about 36 percent instead of doubling.

Electricity used in U.S. data centers in 2010 was significantly lower than predicted by the EPA’s 2007 report to Congress on data centers. That result reflected this study’s reduced electricity growth rates compared to earlier estimates which were driven mainly by a lower server installed base than was earlier predicted rather than the efficiency improvements anticipated in the report to Congress.

The report’s conclusions seemed reasonable in showing that energy growth was less than expected and the methodology looked sound at first blush. Moreover, it even references the EPA’s Energy Star Data Center survey in 2009 (1.93 PUE) and the Uptime Institute Data Center Industry Survey in 2011 (PUE average of 1.83) and the positive impact of the improving PUE numbers (from an assumed 2.0 used in prior reports).

Related post: “Top 10 Things Data Centers Forget About PUE“, points out ten areas that are not being captured in PUE analysis; some of which have significant implications for PUE measurements.

However, for all the well-compiled and analyzed information the report seems to have utilized, it ignores another view of the data center industry energy usage … the actual data center itself.

While I have no detailed quantifiable evidence to question the results, I feel that other factors in the data center industry, such as the massive and ongoing growth of mega-size data centers, makes me believe that there is a larger increase in total energy usage than the report indicates. I would therefore suggest that there are several alternate (or at least additional) data sets that could also be used to more effectively analyze energy usage and trends in the data center:

  • The buildout of new and larger data centers (total square footage of white space for new and existing sites).
  • The rising average power density of all data centers.
  • The shipments of new UPSes (and their total capacities), as well as the installed operational base.
  • The shipments of backup generators, as well as the existing installed base.

The Bottom Line

While I recognize that what I suggest is not a perfect data set, nor is it all readily available, it seems that these additional figures could provide a more complete basis for analyzing the actual power being used by data centers, rather than the volume server shipments that are the primary underpinnings of the report.

So while virtually all players in the industry are working to improve data center energy efficiency (and I do hope that the report conclusion is correct that the overall rate of rise is not as high as was originally projected by the EPA report), there may be higher and still-rising data center energy demands on the immediate horizon.

Related post: “Is it Time for a Bio-Mass Powered Data Center?“, suggests that huge power hungry data centers should consider incorporating on-site biomass electricity generation as an integral part of their operations systems.

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© 2011, Julius Neudorfer. All rights reserved. Do not republish.

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Author: Julius Neudorfer (3 Articles)

Julius Neudorfer is the CTO and founder of North American Access Technologies, Inc. (NAAT). Julius is a member of AFCOM, ASHRAE, BICSI and IEEE, as well as a Certified Data Center Design Professional “CDCDP” designer and instructor. He is the the author of the Hot Aisle Insight blog. Connect with Julius on Linkedin.