Which two metrics are used to monitor energy performance under ISO 50001?

• A. Emissions factor and energy price
• B. Baseline energy use and target energy use (or EnPI)
• C. Annual energy cost and peak demand
• D. Renewable energy share and energy intensity

Answer: (B)

Under ISO 50001, you monitor energy performance by comparing current use to a defined reference point using a clearly set baseline and a measure that shows improvement over that baseline. The two metrics are baseline energy use, which establishes the reference level of consumption, and the energy performance indicator (EnPI) or a target energy use, which expresses the expected or desired energy performance. This pairing lets you quantify progress over time: you set a baseline, then track how energy use moves relative to that baseline with EnPI, demonstrating whether energy performance is improving. Other metrics like energy price, emissions factor, or peak demand don’t directly capture year-to-year performance improvements against a reference point; energy cost varies with price, and renewable share or energy intensity describe aspects of energy use but don’t provide the paired baseline–EnPI framework ISO 50001 relies on.