The state’s critical infrastructure involves those elements that function independently yet are interconnected. It is also affected by ICT networks that exist in other states. These interdependencies make critical infrastructure particularly vulnerable to cyber attacks. At the same time, it is electrical grids that constitute the most crucial element of critical infrastructure. The research hypothesis assumes an urgent need to comprehensively address the cyber security policy of electrical grids in a broader perspective, not only the technical one but also taking into account public policies and the human factor. Quantitative and qualitative methods, literature survey and the desk research method were employed in order to verify this hypothesis. The analyses carried out by the Authors indicated unequivocally that electrical grids constitute an element of the critical infrastructure that is the most vulnerable to cyber threats.