Today, greenhouse gas emissions and climate change stemming from the usage of fossil fuels are significant worldwide issues. Renewable energy, such as solar energy, is an environmentally friendly and non-polluting option. However, there are numerous worries regarding the possible influence of renewable energy integration on power system stability. Therefore, research is required to investigate and assess this effect. This study analyzes and investigates the impact of photovoltaic (PV) power plants installed in the kaberten region (Southwest of Algeria) on the power system's transient stability. The obtained results proved that the photovoltaic power plant positively affects the system's stability. In addition, it provides clean energy and reduces reliance on traditional sources.