PUE rating becomes more powerful and useful when consistently calculated over time. PUE ratings can fluctuate during the work day/peak load compared to evenings and weekends. The Green Grid has produced the following frequency guideline for efficiency measurements:
▪️ Basic Efficiency Program: measured weekly/monthly
▪️ Intermediate Efficiency Program: measured daily
▪️ Advanced Efficiency Program: measured continually
Measuring PUE on a regular basis allows for a baseline and provides an accurate picture of how and where energy is being consumed. It is extremely difficult to improve energy efficiency without this baseline. After the initial measurement is complete a remediation plan can be accurately developed and implemented. Regardless of the frequency of measurement, basic, intermediate, or advanced, consistency is the key and will significantly increase the probability of improving energy efficiency.