In 2006, the first year of the plan, the country's reduction in energy intensity, which measures energy consumption per unit of economic output, was a mere 1.23%.

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In addition, according to the U.S. Energy Information Agency, the U.S. has reduced its energy consumption per unit of GDP by nearly 50% since 1980 and 20% since 1999.

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And the logic works with servers as well as storage, as each device category continues to decrease in size, improve in capacity and performance, and reduce its power consumption per unit of work with each new generation.

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Those gains take two forms: less electricity consumption and a lower cost per unit of processing power.

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Crane devised a new measure of energy consumption: a three-dimensional unit he called a cubic mile of oil.

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This extreme density reduces, per a given unit of work, the datacenter size, energy consumption, complexity and cost.

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"In real terms, alcohol is 62% more affordable now than it was 30 years ago and research indicates that a minimum unit price of 40p and a ban on promotions could decrease consumption by 5.4%, " he said.

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