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"Cost-effective strategies can reduce carbon footprint."

"HVAC consumes 56% of total electric usage in hotels and motels and accounts for 10.8 kWh/square foot."

Florida Power & Light Company

"Energy Efficiency technologies currently have $700 billion invested, in 20 years that number could reach $7 trillion."


"Energy Efficiency has met 75% of the demand for new energy."


"EPA study said data centers account for 1.5% of all electricity consumption in US, and 2% worldwide."


"U.S. hotels spend - on average - $889 annually per available room for electricity which accounts for 58% of total utility costs."

GE Lighting

"Existing technologies and strategies could reduce typical server energy use by an estimated 25 percent and entire data center consumption by 40 percent."


"81% of senior decision makers at large U.S. corporations surveyed said that carbon credits are now part of their green IT strategy - compared to only 18 percent in 2008."

Campos Research & Analysis

"Marriott International says that more than 85 of its hotels will earn the Energy Star label signifying 35 percent less energy use than average buildings."

"The voluntary carbon markets transacted an estimated 123 million tonnes of carbon credits valued at US$705 million in 2008, up from 65 million tonnes of credits valued at $331 million in 2007."

"In 2007, the voluntary carbon market or over the counter market was dominated by Energy Efficiency projects, accounting for 18% of the total volume."


"73% of senior decision makers at large U.S. corporations surveyed identified "energy efficiency" as the key aspect of a green data center."

"Most analysts believe that by 2020 the global marketplace for carbon will have a value of 2 trillion euros, with the United States trading two-thirds of that."

Global Trends in Sustainable Energy Investment 2009

"Connecticut ratepayers contributed approximately $105 million in total for energy efficiency, or $30 per household between for the Connecticut Energy Efficiency Fund and the Class III EEPS."

"80% of CEOs view sustainability as affecting brand value, 82% expect climate regulation within the next five years, and 31% stated that it is important to the corporation to reduce their environmental impacts."


"Neuwing Energy Ventures purchases Green-e certified REC's for some of the world's leading companies such as DuPont and Lowe's which are both listed on the national top 50 as noted by the U.S. Environmental Protection Agency."

"The hospitality industry spends $3.7 billion a year on energy. Electricity use accounts for 60-70% of the utility costs of a typical hotel. Energy-efficient lighting can reduce electricity use up to 75%."

California Hotel & Lodging Association

News Archives

International Agreement on PUE for Measuring Data Center Efficiency

By T. Lau

April 5, 2010

As more attention is focused on data centers and the amount of energy it takes to power them, more companies are finding the commercial and public relations value in undertaking Green IT projects. The problem, as I've blogged about previously, is that there is very little standardization on how to measure Green IT effectiveness and preventing outlandish or unprovable claims when it comes to how green a data center actually is. The EPA's forthcoming Energy Star for Data Centers program will go a long way towards establishing this common standard, but the program is for U.S.-based data centers only.

Over the weekend, news emerged of an international agreement to establish data center energy efficiency. The agreement is between The Green Grid (U.S.-based industry group), the U.S. Environmental Protection Agency, the European Commission Joint Research Centre, the Japan Ministry of Economy, Trade and Industry, and the Green IT Promotion Council (Japan-based industry group). For now the agreement is limited to these three regions, but could expand to include others such as China and India in the future.

The agreement establishes the Power Usage Effectiveness (PUE) as the "preferred energy efficiency metric." Specifically, the agreement states the following shall be "guiding principles" as interim steps, and that data centers are "recommended" to measure PUE according to the principles:

  • PUE is a measurement of the total energy of the data center divided by the IT energy consumption.
  • The industry should improve IT measurement capability to enable take the measurement directly at the IT load (servers). At a minimum, IT energy measurements should be measured at the output of the UPS.
  • For a dedicated data center, total energy measurement should include all energy sources at the point of utility handoff. For data centers in larger buildings, total energy should include all cooling, lighting, and support infrastructure in addition to IT load.

That's all the agreement contains for now. There is much work left to be done, including defining how PUE is calculated and how total energy should be measured. A task force with representatives from each group is meeting throughout the year to develop these measures.

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