This project investigates the impact of increasing photovoltaic (PV) system installations on power networks in the Western Cape, South Africa. Acknowledging the global rise in PV penetration and associated concerns, the study analyzes detailed grid models of representative networks to project the effects of high PV penetration. This report specifically identifies potential technical challenges, such as voltage rise, power flow congestion, and protection issues, that may arise under high PV penetration scenarios. These identified issues will inform the development of mitigation strategies in subsequent research efforts under the same project. The technical performance outputs of this work informed the estimation of necessary capital investment and increased operational and maintenance costs required to accommodate the projected PV growth. The research includes a literature review on technical issues and a technical component that assessed hosting capacity limits of low-voltage (LV) and medium-voltage (MV) networks, considering voltage level, conductor loading, and transformer loading in representative Western Cape networks. It also assesses the implications of the analysis for network operations and long-term planning.