Performance evaluation, monitoring and measurement of an EnMS
Domain 5 tests the measurement plan, the EnPI-versus-baseline comparison, and the three evaluation layers: monitoring, internal audit and management review (clause 9).
Monitoring and measurement (9.1.1)
Define what to monitor and measure, the methods, when and by whom, and the criteria against which energy performance is evaluated; analyse and evaluate the results. Key parameters are SEUs, relevant variables, EnPIs and the effectiveness of action plans. Ensure measuring equipment used for energy data is verified or calibrated as appropriate. Compare EnPI values with the baseline and investigate significant deviations.
Compliance (9.1.2)
Evaluate compliance with legal and other requirements at planned intervals and retain evidence of the results.
Internal audit (9.2)
A risk-based programme at planned intervals, considering process importance, changes and previous results; auditors objective and impartial; results reported to management.
Management review (9.3)
Inputs include status of actions, changes in issues and interested parties, energy performance and EnPI results, compliance, audit results and resources. Outputs include decisions on improvement and on changes to the EnMS, EnPIs and baseline.
Worked example
Monthly electricity per tonne in a press shop reads 0.31 kWh/kg against a baseline of 0.28. The monitoring plan records the deviation and checks variables; a new night shift is identified, and analysis shows start-up losses drive the rise. The outcome is an action plan item, not a baseline revision.
Traps
Treating monitoring as meter reading without evaluation; adjusting the baseline to hide deterioration (revision requires a significant static-factor change, not one bad month); a management review with no energy performance data; internal audit covering documents but never the SEUs.