PUE & Data Center Energy Efficiency Analyzer

☷

Engineering inputs

Set the engineering assumptions and design parameters.

1. Core inputs

Calculation mode

Total facility power / energy

IT equipment power / energy

Electricity tariff

currency/kWh

Target PUE

2. Non-IT overhead breakdown

Component values use the same unit as the core input. Leave unknown items at 0; the analyzer shows the unallocated overhead.

Cooling

UPS loss

Lighting

Distribution loss

Other

3. What-if & environmental metrics

IT load growth

Annual water use (optional)

Annual CO₂ emissions (optional)

kgCO₂

Monthly PUE, comma-separated (optional)

▥

Engineering results

Review calculated capacity, limits and design checks.

Analysis result

PUE—

IT share—

Non-IT overhead—

Facility overhead / IT—

Annual total energy—

Annual IT energy—

Annual non-IT energy—

Annual electricity cost—

Target-PUE optimization

Potential annual energy saving—

Potential annual cost saving—

PUE after IT growth (fixed overhead)—

Non-IT composition

Unallocated overhead—

WUE / CUE

WUE—

CUE—

Monthly PUE trend

Engineering references & boundaries

Content reviewed: 2026-09-10

Authoritative references

Engineering FAQ

What measurement boundary should I use for PUE?

Use a consistent facility-energy boundary and a consistent IT-energy meter boundary across the reporting period. Document changes before comparing periods.

Can instantaneous power be used for PUE?

Instantaneous power is useful for operational snapshots, while annual energy is better for formal trend and reporting comparisons.

Why can PUE improve when IT load rises?

If facility overhead stays nearly fixed while useful IT load increases, the overhead is spread across more IT energy and PUE can fall.

What does WUE add to PUE?

WUE adds operational water use per unit of IT energy, so an energy-efficient cooling strategy can also be reviewed for water impact.

Is a lower PUE always better?

Lower facility overhead is generally desirable, but reliability, climate, redundancy, workload and measurement boundaries must be considered together.