Power Usage Effectiveness

Definition

Power Usage Effectiveness (PUE) is a key metric used to measure the energy efficiency of data centers. It represents the ratio of total energy used by a facility to the energy delivered to the IT equipment.

Key Characteristics

• Measures the efficiency of data center infrastructure (cooling, power distribution, etc.).
• Calculated as the ratio: Total Facility Energy / IT Equipment Energy.
• Used as a primary benchmark for tracking energy optimization efforts.
• Heavily influenced by cloudification and the adoption of modern, efficient cooling technologies.

Applications

• Benchmarking the operational energy efficiency of data centers.
• Monitoring progress in facility-level decarbonization strategies.
• Evaluating the impact of infrastructure upgrades (e.g., HVAC improvements, server virtualization) on energy consumption.

Related Concepts

• ITU-T L.1470
• First-order effect

Related Entities

• ITU-T Study Group 5

Mentions in Source

• “The data centre trajectory considers: data traffic development… power usage effectiveness (PUE) improvements (due to efficiency measures and cloudification), where cloudification and hyperscale data centres are the main reasons for efficiency improvements.” — ITU-T L.1470 (Greening Digital)