Commercial and industrial (C&I) electricity consumers would like to reduce their electricity costs. Many of them engage an electrician expert to assess the performance of their electrical network (power factor, distribution losses, etc.). Improving the energy efficiency (EE) of a facility and reducing their electricity costs is not only limited to the electrical network performance. C&I consumers need to engage a professional auditor when developing energy efficiency projects to assess all their consuming departments and systems: compressed air, steam, water cooling, pumping and ventilation, and more generally all production equipment and buildings of the facility.