Quiz: AI Data Center Sustainability, PUE & Carbon (Part 15)

10 questions from Part 15 of the guide. Score instantly; every explanation links to the chapter that derives the answer.

PUE's blind spot in a liquid-cooled AI facility is that it…
can't be computed anymorerewards moving losses inside the IT boundary and ignores water, carbon, and useful workis too strictonly works in cold climates
The industry weighted-average PUE has been stuck around…
1.11.54, flat for six consecutive years2.50.9
The single setpoint decision that cascades through the whole efficiency story is…
office thermostatchilled (~18–27 °C) vs warm-water (~32–45 °C) facility loops — free cooling, WUE, and heat-reuse grade all followUPS float voltagelighting schedules
Location-based vs market-based Scope 2 reporting differ in that…
they always matchlocation-based uses the physical grid mix; market-based lets contracted clean power (PPAs, RECs) offset — and 24/7 CFE matching is the stricter frontiermarket-based is banned in the EUlocation-based includes Scope 3
The site water decision is fundamentally…
cosmeticevaporate (low-PUE, water-exposed) vs closed-loop/dry (near-zero process water, energy-exposed) — and grid power embeds ~5.1 L/kWh anywayabout landscapingsolved by desalination
Heat reuse becomes economically real when…
any data center exists near a citythe thermal plant is designed for it — a high-grade (45–65 °C) loop near an offtaker, with regimes like Germany's 10→20% mandates forcing the issueelectricity is freenever; it's greenwashing
Embodied carbon matters increasingly because…
operational carbon is risingas grids decarbonize, the concrete, steel, and silicon already spent become the dominant share — the crossover lands around 2031it's easier to measureoffsets cover it
EU EED Article 12 requires data centers above 500 kW IT to…
close by 2030publicly file PUE, WUE, ERF, and REF togetheruse only renewablesrun underground
The grid-interactive alternative to interconnecting as an unconditional firm load is…
there is noneflexible/curtailable interconnection — accepting rare curtailment windows in exchange for years-faster queue positionsbuilding your own transmissionbatteries only
Cooling-energy savings from water-side economizing versus mechanical-only run…
~5%~15%~40–65% annually~99%

Check your understanding: Sustainability & Efficiency