← All parts of this equation

Equation 12 · Part 8 · The Physical Plant: Power, Cooling, and Networks in an AI Datacenter

addition

PUE=EfacilityEIT=1+Ecooling+Edistribution+EotherEIT.\mathrm{PUE} = \frac{E_{\mathrm{facility}}}{E_{\mathrm{IT}}} = 1 + \frac{E_{\mathrm{cooling}} + E_{\mathrm{distribution}} + E_{\mathrm{other}}}{E_{\mathrm{IT}}}.
addition

What this part means

Add the term after the plus sign to the term or group before it.

Its job in the formula

Add the term after the plus sign to the term or group before it.

The passage around this formula

Power usage effectiveness is the industry’s one universally reported number: PUE=EfacilityEIT=1+Ecooling+Edistribution+EotherEIT\mathrm{PUE} = \frac{E_{\mathrm{facility}}}{E_{\mathrm{IT}}} = 1 + \frac{E_{\mathrm{cooling}} + E_{\mathrm{distribution}} + E_{\mathrm{other}}}{E_{\mathrm{IT}}}. 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 this part in the article →

Learn the underlying idea

Addition combines quantities; subtraction measures the signed difference between them. Parentheses show what is combined before the rest of the expression is evaluated.

Open the illustrated addition and subtraction in an equation guide →

Sources cited in the surrounding passage

These citations provide research context; check each source for the exact claim it supports.