Symbol E_facility
acility occurs above the fraction bar. The numerator is divided by the entire denominator below it.
Read this term in its guide →Published equation contexts
Why this formula appears here
Power usage effectiveness is the industry’s one universally reported number: . Uptime Institute, which has collected the metric since its introduction by The Green Grid in 2007, reported a weighted average annual PUE of 1.54 across its 2025 respondent sample, “marking the sixth consecutive year that this headline figure has virtually stood still.” Beneath that flat average the sample separates: facilities commissioned within five years of the survey averaged 1.48, facilities of 20 MW and above averaged 1.44 globally, and 15% of respondents reported 1.3 or better [ 3 ] . Google, disclosing its own fleet, states that “in 2025, the average annual power usage effectiveness for…
Read the representative guide
Symbol E_IT
T occurs below the fraction bar. The quantity above the bar is divided by this expression; zero is excluded as a denominator.
Read this term in its guide →Symbol E_cooling
ooling occurs above the fraction bar. The numerator is divided by the entire denominator below it.
Read this term in its guide →Symbol E_distribution
istribution occurs above the fraction bar. The numerator is divided by the entire denominator below it.
Read this term in its guide →Symbol E_other
ther occurs above the fraction bar. The numerator is divided by the entire denominator below it.
Read this term in its guide →Numerator: E_cooling + E_distribution + E_other
The complete quantity above the fraction bar.
Read this term in its guide →How to interpret it
With a fixed numerator, increasing a nonzero denominator reduces the fraction. Read it with the definitions, units, and assumptions supplied by the article.
Research cited beside this formula
Published contexts (1)
A symbol can carry a different meaning in another article. Each occurrence keeps its own guide and term definitions.
Equation 12 · Datacenters & Infrastructure
The Physical Plant: Power, Cooling, and Networks in an AI Datacenter
This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.
Power usage effectiveness is the industry’s one universally reported number: . Uptime Institute, which has collected the metric since its introduction by The Green Grid in 2007, reported a weighted average annual PUE of 1.54 across its 2025 respondent sample, “marking the sixth consecutive year that this headline figure has virtually stood still.” Beneath that flat average the sample separates: facilities commissioned within five years of the survey averaged 1.48, facilities of 20 MW and above averaged 1.44 globally, and 15% of respondents reported 1.3 or better [ 3 ] . Google, disclosing its own fleet, states that “in 2025, the average annual power usage effectiveness for…
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