System Assessment Standards

System assessments collect and analyze information on system design, operation, energy use, and performance data. This information is used to identify energy efficiency improvements that will optimize system energy use or performance. An assessment may also include additional recommendations for improving resource utilization, reducing per unit production cost, and improving environmental performance related to the assessed system(s).

System assessment standards for Superior Energy Performancecm and corresponding guidance documents are available for purchase through the American Society of Mechanical Engineers (ASME):

System Type


Guidance Document

Process Heating



Compressed Air









These standards provide a basis for operators of industrial facilities to measure energy efficiencies, improve environmental performance, optimize fuel utilization, and perform other important energy assessments. The standards present the requirements for organizing and conducting assessments, collecting and analyzing data, and reporting and documenting findings.

The guidance documents provide rationale for the technical requirements of the assessment standards and give technical guidance, application notes, alternate approaches, tips, techniques, and rules-of-thumb.

All four standards and guidance documents were developed through the American Society of Mechanical Engineers (ASME) with four technical committees in each system type and a consensus committee that guides all four standards. This portfolio of system assessment standards will expand over time to include additional system types.

Why Develop System Assessment Standards?

System assessment standards set requirements on how to conduct an energy-efficiency assessment at an individual facility for a specific system type. The standards provide a framework for conducting assessments that will help define the market for system assessment services.

The objective is to provide clarity for services that have been variously described as energy assessments, energy audits, energy surveys, and energy studies. Standards will assist both users and sellers of these services. By applying these standards, the systems are analyzed through various techniques (e.g., measurement and analysis) to identify, document, and prioritize energy performance improvement opportunities.

These standards also set the requirements for reporting the results of an assessment that considers the entire system—from energy inputs to the work performed as the result of these inputs. An assessment meeting these standards need not address each system component or subsystem within an industrial facility with equal weight; however, it shall be sufficiently comprehensive to identify the major energy efficiency opportunities for improving the facility's overall energy performance.

These standards are designed for primary application at industrial facilities, but many of the concepts may be used in other facilities (e.g., in the institutional and commercial sectors).