Energy Efficiency and Prosumer electrical installation standards
Scope of application of standards
It is important to differentiate standards which apply to a complete site assessment, to standards which apply to measurement devices used to help site assessments, as shown in Figure K1d:
| Assessment of a complete site | Assessment tools | Devices used to assess plants |
|---|---|---|
 ISO 50001
Energy Management Systems - Requirements with guidance for use |
ISO 50006
Energy Baseline (EnBs) and Energy Performance Indicators (EnPIs) |
 IEC 61557-12
Power Metering and Monitoring devices |
IEC 60364-8-1 
Low voltage installations – Part 8-1: Energy Efficiency |
ISO 50001
ISO 50001 "Energy management systems - Requirements with guidance for use" is the main international standard providing requirements on Energy management Systems (EnMS). It provides a framework of requirements for organizations to:
- Develop a policy for more efficient use of energy
- Fix targets and objectives to meet the policy
- Use data to better understand and make decisions about energy use
- Measure the results
- Review how well the policy works, and
- Continually improve energy management.
The Energy management system model required in ISO 50001 is described in Figure K2:
ISO 50006
ISO 50006 is a companion standard of ISO 50001, providing practical guidance on how to monitor energy efficiency with the help of energy performance indicators (EnPI) measured on periods. Comparing EnPI between the baseline period and the reporting period means measuring energy efficiency improvements, see Figure K3.
EnPI = value or measure that quantifies results related to energy efficiency, use and consumption in facilities, systems, processes and equipment as a whole or in part.
EnB = quantifies energy performance during a specified time period to be used as a base reference for comparing energy performance.
The organization should consider the specific energy performance targets while identifying and designing EnPIs and EnBs.
One element highlighted in ISO 50006 is the importance of defining and quantifying the factors or variables which may have an impact on energy consumption (such as external temperature, occupancy …) in order to compare energy performance under equivalent conditions.
