Google & Power Supply Standards

Excerpts from:
"Google to Push for More Electrical Efficiency in PC’s"
September 26, 2006 -- By JOHN MARKOFF, NYTimes

SAN FRANCISCO, Sept. 25 — Google is calling on the computer industry to create a simpler and more efficient power supply standard that it says will save billions of kilowatt-hours of energy annually.

In a white paper to be presented Tuesday on the opening day of the Intel Developer Forum here, two leading data center designers at Google will argue that the industry is mired in inefficiency for historical reasons, dating to the introduction of the first I.B.M. PC in 1981.

At that time, standard power supplies, which convert high-voltage alternating current to low-voltage direct current, were required to provide multiple output voltage, which is no longer necessary in today’s PC’s.

The Google plan calls for a shift from multivoltage power supplies to a single 12-volt standard. Although voltage conversion would still take place on the PC motherboard, the simpler design of the new power supply would make it easier to achieve higher overall efficiencies.

The Google proposal is similar in its intent to an existing effort by the electric utility industry to offer computer makers financial incentives for designing more efficient power supplies for personal computers. Existing PC power supplies vary widely in efficiency, from as high as 90 percent to as low as 20 percent.

The existing effort, 80 Plus, sets an 80 percent efficiency standard as a goal. It is a partnership between Ecos Consulting, an environmental consulting firm, and a group of electric utility companies. Ecos began measuring the efficiency of computer power supplies in 2003 and found that none of them met the efficiency standard.
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Both the Google engineers and Mr. Calwell agreed that there was a significant design flaw, which they described as “overprovisioning,” in today’s PC power supplies. “It’s like putting a 400-horsepower engine in every car, just because some cars have to tow large trailers every once in a while,” Mr. Calwell said.

The Google white paper argues that the opportunity for power savings is immense — by deploying the new power supplies in 100 million desktop PC’s running eight hours a day, it will be possible to save 40 billion kilowatt-hours over three years, or more than $5 billion at California’s energy rates.

Although Google does not plan to enter the personal computer market, the company is a large purchaser of microprocessors and has evolved a highly energy-efficient power supply system for its data centers.
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According to EPRI Solutions, an energy research and consulting firm, over 2.5 billion AC/DC power supplies are used in the United States and 6 to 10 billion worldwide.

Currently, EPRI said, power supplies account for more than 2 percent of the nation’s electricity consumption and that more efficient design could cut use in half, saving nearly $3 billion in electricity costs.

One personal computer industry pioneer said he believed that the Google proposal might have important indirect benefits.

“I imagine a standard low-voltage distribution system inside buildings having alternate energy supplies like solar,” said Lee Felsenstein, the designer of the Osborne 1 and Sol personal computers. “Google’s proposal would make that a practicality.”