**1. Introduction**

Power plants, transformers, transmission lines, and distribution stations are the main parts of the power system network [1]. Failure in any part of those could lead to blackout or outages. The European Network of Transmission System Operators expresses the blackout as "the interruption of electricity generation, transmission, distribution, and consumption processes, when operation of transmission system or a part is terminated" [2, 3]. In the last decade, the Libyan power grid faced numerous blackouts and outages and the consequences of these blackouts and outages were costly [4]. Therefore, more studies have to be done to reduce the effect of these problems. Some reasons for the continuous interruptions and load shedding are; the armed conflicts, postpone of overhaul units of the power plants. In this chapter, field study on the causes of power outages and blackout in Western Mountain power plant & Al-Zawia CCPP is presented. As well as, an assessment of the generation power units in both power plants during the period of the outages and blackouts 2019–2020. In order to suggest practical solutions.
