We have developed a methodology that utilizes electricity metering during energy audits. Our approach keeps costs low by lending metering devices to companies, utilizing wireless technology, and automating data collection and report genera-tion. The generated report supports energy consultants in their analyses. In the 17 audits where we applied this methodology, we discovered that most energy effi-ciency measures were related to process installations. The savings potential achieved through metering increased the saved energy by nearly 70% for the total sample. For individual sites, the impact of monitoring varied significantly, rang-ing from 5% to 100% of the total savings. The additional costs associated with metering were recouped in less than one year for 14 of the sites. Our field study demonstrates that integrating metering into energy audits not only increases the number of energy-saving measures found but also enhances the precision of es-timated energy gains while being profitable in most cases. Furthermore, measur-ing electrical drives provides valuable insights into sizing quality and future opti-mization opportunities.