3.2.1. Minimum Requirements

The ISO 50001 standard that deals with energy managemen<sup>t</sup> issues is incorporated at the first stream and thus apprehends guidelines to enable energy managemen<sup>t</sup> system [45]. Enabling the organizations towards energy efficiency is the primary purpose of ISO 50001 Energy Management System standard. The standard is reviewed and published by the ISO/TC 301 Technical Standardization Committee, Energy Management, and Energy Saving in 2018 [45]. The protocol has a high level of hierarchical structure consists of ten chapters with a homologous architecture. The ISO 50001 standard is a consistent improvement framework which consists of "Plan-Do-Check-Act" at organizational practices. Table 4 presents the phases that are comprehended at ISO 50001 Energy Management System standard. However, it does not apprehend the critical assessment of the enterprises' effectiveness for a taken initiative of particular energy managemen<sup>t</sup> practice. In addition, the initial stream incorporates primary endeavor to evaluate energy management, maintaining the limit of analysis [40,44].


**Table 4.** The continual phases of ISO 50001 Energy Management System standard [45].
