Energy Efficiency Metrics

  • Michael K. Patterson


In this chapter, metrics for measuring and improving data center efficiencies are explored. Metrics at varying levels from the infrastructure components to the entire data center are reviewed. The primary data center efficiency metric, PUE is discussed at length as well as variants of PUE. The challenges of defining a metric around computing output or data center useful work are also considered. The chapter includes discussions on a variety of other related topics such as codes, standards, and rating systems. Through a thorough review of the chapter, the reader will also gain a strong insight into some of the fundamental issues in data center design and operations.


Energy Efficiency Data Center Water Footprint Single Data Center Tier Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 1.
    EPA (2007) Report to Congress on server and data center energy efficiency, Public Law 109–431,
  2. 2.
    EPA (2010) Energy savings from energy star-qualified serversGoogle Scholar
  3. 3.
    The Green Grid (2009) Proper sizing of it power and cooling loads, White Paper #23Google Scholar
  4. 4.
    Koomey JG et al. (2009) Assessing trends over time in performance, costs, and energy use for servers,
  5. 5.
  6. 6.
    Belady CL (2007) In the data center, power and cooling costs more than the IT equipment it supports. In: Electronics cooling, February, pp. 24–27,
  7. 7.
    Herrlin MK, Patterson MK (2009) Energy-efficient air cooling of data centers at 2000 W/ft2,, InterPACK’09
  8. 8.
    Patterson MK et al. (2007) Data center TCO; A comparison of high-density and low-density spaces,
  9. 9.
    Turner PW (2010) Dollars per kW plus Dollars per square foot of computer floor, The Uptime Institute,
  10. 10.
    The Green Grid (2009) Usage and public reporting guidelines for The Green Grid's infrastructure metrics PUE/DCiE - WP #22,
  11. 11.
    EPA (2010) Recommendations for measuring and reporting overall data center efficiency,
  12. 12.
    The Green Grid (2010) ERE: A metric for measuring the benefit of reuse energy from a data center, White Paper #29
  13. 13.
    Kaplan JM et al. (2008) Revolutionizing data center energy efficiency, McKinsey and Co.,
  14. 14.
  15. 15.
    SPEC (2011) Server efficiency rating tool,, Standard Performance Evaluation Corporation
  16. 16.
  17. 17.
  18. 18.
    SPECpower Committee (2011) SPECpower rating tool,
  19. 19.
    The Top 500 (2011)
  20. 20.
    The Green 500 (2011)
  21. 21.
    Herrlin MK (2005) Rack cooling effectiveness in data centers and telecom central offices: the rack cooling index (RCI). ASHRAE transactions, Vol 111, Part 2. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GAGoogle Scholar
  22. 22.
    Herrlin MK (2008) Airflow and cooling performance of data centers: two performance metrics. ASHRAE transactions, Vol 114, Part 2. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GAGoogle Scholar
  23. 23.
  24. 24.
  25. 25.
    European Union (2011) European codes of conduct for ICT,
  26. 26.
    US Green Building Council (2011) LEED,
  27. 27.
    The Uptime Institute, Resource Center, Understanding Tiers,, 2011
  28. 28.
    Turner WP et al. (2008) Tier classifications define site infrastructure performance,, Uptime Institute, 2008
  29. 29.
    Climate savers computing (2011)
  30. 30.
  31. 31.
    ASHRAE, Standard 90.1-2010 (I-P Edition) – Energy standard for buildings except low-rise residential buildings (ANSI Approved; IESNA Co-Sponsored), ASHRAE, 2010Google Scholar
  32. 32.
    ASHRAE, Standard 127–2007 – Method of testing for rating computer and data processing room unitary air conditioners (ANSI Approved), ASHRAE, 2007Google Scholar
  33. 33.
    ASHRAE TC 9.9, Thermal guidelines for data processing environments, 2nd Edn.,, ASHRAE, 2010
  34. 34.
    ASHRAE TC 9.9, Datacom Series,, ASHRAE, 2011
  35. 35.
    The Greenhouse Gas Protocol Initiative (2011), Frequently asked questions,
  36. 36.
    The Green Grid, Carbon Usage Effectiveness (CUE): A Green Grid Data Center Sustainability Metric - WP#32,, 2010
  37. 37.
    United States Environmental Protection Agency (2005) Metrics for expressing greenhouse gas emissions: carbon equivalents and carbon dioxide equivalents
  38. 38.
    US Energy Information Administration;
  39. 39.
    U.S. Department of Energy, Energy Information Administration Form EIA-1605 (2007), Appendix F. Electricity Emission Factors,
  40. 40.
    The Green Grid (2011) Water usage effectiveness (WUE): a Green Grid data center sustainability metric – WP#33Google Scholar
  41. 41.
    Torcellini P, Long N, Judkoff R, Consumptive water use for U.S. power production, NREL/TP-550-33905, 2003, Golden, COGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Eco-Technology Program OfficeIntel CorporationHillsboroUSA

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