average annualized PUE reported by respondents to Uptime Institute's 2025 survey (n=681); sixth consecutive broadly flat year
1.54observed
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| Scope | Respondent-survey statistic, not an industry-weighted fleet average. The public claim does not provide a population-weighting method; use it as a dated survey benchmark and retain the sample and survey methodology when comparing it with a named facility or fleet. |
| Caveat | 2025 survey figure (n=681). Uptime's 2026 survey (published 2026-07-28; analysed 2026-08-06) reports two separately defined successors: 1.52 as the annual survey average and 1.36 on a capacity-weighted basis — the gap is the larger-facility advantage, not an improvement in the same population. Neither is a measured average of the world fleet. Same 2026 survey: modal installed-base rack density reached 11 kW (from 9 kW in 2025) — the installed base, not the AI-factory design point. |
| As of | 2025 |
| Source | Uptime Institute Global Data Center Survey 2025 |
| Review | checking…review by 2026-12-15 · standard cadence |
| Recorded changes | last 2026-06-29 |
| Claim id | weighted-average-annualized-pue-sixth |
Where the guide uses it
- 0.3 Vocabulary, Mental Models & the Metric Stack
- 0.4 The Standards & Specifications Landscape (Living Index)
- 5.8 Heat Rejection: Chillers, Dry Coolers, Towers, Adiabatic & Economizers
- 15.1 Efficiency Metrics: PUE, WUE, ERF, REF & the Post-PUE Metric Stack
- 15.2 Energy Efficiency: Cooling, Free Cooling, Setpoints & Power-Chain Losses
- 15.7 Regulation, Reporting & Disclosure Frameworks
← Full numbers register — every date-stamped figure in the guide, with revision history.