Adamos, VasileiosALAMRI, TARIQ2026-08-112026https://hdl.handle.net/20.500.14154/79903This study critically examines the practicality and contextual application of Zero Trust Architecture (ZTA) within Saudi Arabia’s critical energy infrastructure and develops a literature-based adoption strategy tailored to this environment. The research is motivated by the increasing cybersecurity risks associated with IT/OT convergence, smart grid expansion, and the growing reliance on interconnected energy systems under Saudi Vision 2030. A qualitative research design was adopted, based on a Systematic Literature Review (SLR) supported by PRISMA guidelines and thematic analysis following Braun and Clarke. A total of 20 high-quality studies were selected and analysed to identify key patterns related to Zero Trust principles, cybersecurity threats, and implementation challenges in energy-critical environments. The findings show that ZTA provides a strong conceptual foundation through continuous authentication, identity-based access control, micro-segmentation, and adaptive security mechanisms. However, its implementation in Saudi energy systems is constrained by technical limitations in legacy OT environments, organisational resistance, and fragmented regulatory frameworks. The study further reveals that IT/OT convergence and IoT integration significantly expand the attack surface, reinforcing the need for advanced and adaptive security models. In response, this research proposes a phased, risk-based ZTA adoption approach aligned with national cybersecurity governance frameworks and operational constraints of OT systems. The study concludes that while ZTA is highly relevant and feasible, its successful implementation requires contextual adaptation, gradual deployment, and strong organisational alignment.89enZero Trust Architecture (ZTA)Saudi ArabiaEnergy InfrastructureIT/OT ConvergenceCybersecurityThesis