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Glossary
Energy standards and regulation

What is ISO 50001?

Definition

ISO 50001 is the international standard that sets requirements for establishing, running and improving an energy management system, built around an energy baseline and energy performance indicators (EnPIs).

Who adopts ISO 50001

Adoption is voluntary. Manufacturers, hospital groups, campuses, data center operators and property owners use it to run energy management as a repeating plan, do, check, act cycle instead of a one-off project. Third party bodies issue certification, and many organizations follow the framework without certifying. In the UK, a certified system can stand in for an ESOS audit under conditions the Environment Agency sets.

Edition and what it asks for

ISO lists ISO 50001:2018 as current, with Amendment 1:2024 adding climate action wording common to its management system standards. The standard fixes no savings target. It asks the organization to identify significant energy uses, set a baseline, choose EnPIs and show improvement against them, normalizing for relevant variables such as weather or production.

EnPI data Aqueduct produces

aQ EnergySmart builds the energy baseline by regression of consumption on cooling and heating degree days, from live metering or from 6 to 12 months of uploaded utility bills. Sub-metered HVAC, lighting and plug feeders let a team rank significant energy uses by measured kW instead of estimates, and the actual versus adjusted baseline view becomes the EnPI trend reviewed at management review.

Questions

ISO 50001: common questions

ISO 50001 is the global rulebook for running energy as a managed process with targets and evidence. An organization sets an energy policy, finds its significant energy uses, fixes a baseline and tracks EnPIs, then proves improvement through internal audits and management review. Certification by an accredited body is optional. See how Aqueduct maps to it on the ISO 50001 compliance page.

No. ISO 14001 covers environmental management broadly, while ISO 50001 deals only with energy performance. Many sites run both inside one integrated management system, sharing document control, internal audit and management review, so the energy data feeding ISO 50001 also serves the energy aspects in ISO 14001.

Not necessarily. Energy use intensity is one possible EnPI, but an organization can pick others, such as energy per unit produced or per occupied hour, provided it fits the significant energy use. A weather-sensitive EnPI is usually tracked against a weather-normalized baseline rather than raw totals.

Writing the energy policy, running internal audits and granting certification. Those belong to the organization and its certification body. Aqueduct supplies the measured inputs: metered consumption by significant energy use, baseline comparisons and exports that auditors can trace back to interval data through measurement and verification.

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