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The Greening of IT
226 How Companies Can Make a Difference for the Environment

Worldwide Electricity Used in Data Centers

Jonathan Koomey of the Lawrence Berkeley National Lab (LBNL) and
Stanford University has been active in helping to estimate worldwide
electricity use in data centers. His papers on the subject are listed in the
Bibliography. In this section, a summary from his September 2008
paper, “Worldwide Electricity Used in Data Centers,” available at
http://stacks.iop.org/1748-9326/3/034008, is discussed.
Table A.1 shows installed base and power use per server by major
world region and server type. Typical power use per server was derived
from a detailed analysis of the most popular server models reported by
IDC. Koomey’s analysis estimated the actual electricity used by the six
most popular models in the installed base for each major class of server
(volume, mid-range, and high end) for the U.S. and the world. Power
use was based on manufacturer data, measurements, or engineering esti-
mates of servers typically configured and operated. Power use per server
for non-U.S. regions was inferred from the world and U.S. installed base
and power use per server numbers. ptg

Table A.1 Installed Base and Server Power per Unit in 2000 and 2005 by Major World Regions

Installed Units Volume Mid-Range High-End Total/
Base Avg.
2000
U.S. Thousands 4,927 663 23 5,613
Western Europe Thousands 3,332 447 15 3,794
Japan Thousands 1,140 250 15 1,405
Asia Pacific Thousands 1,416 132 4 1,552
(ex. Japan)
Rest of World Thousands 1,425 317 8 1,750
Total Thousands 12,240 1808 66 14,114