Power System Audit refers to the comprehensive inspection and evaluation of equipment, system performance, and occupational health and safety (OHS) practices in electrical facilities. The graph illustrates that system availability and reliability naturally decline over time due to aging and deterioration. However, regular audits, combined with modernization and maintenance plans, can prevent this decline and restore the system to its original design reliability—or even higher.

When deficiencies identified during the audit are promptly addressed, modernization and maintenance activities enhance system performance. These improvements not only ensure safer and more efficient operation of equipment but also reduce energy losses and prevent workplace accidents, making long-term system safety and performance sustainable.