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Infrastructures are networks of highly complex systems that can be classified as socio-technical organisms with hidden consciousness. The hidden consciousness of these types of systems lies beyond their definition. Although these systems are structurally independent of any outside component, but collaborate synergistically to provide their services to the end customer. The interdependencies between these complex systems bring about sophisticated and unpredictable outcomes. In this paper we propose a platform independent metamodel for critical infrastructures. The metamodel precisely defines every aspect of an infrastructure through clear syntactical and semantic definition of existing concepts and relationships. The PIM has been defined as a UML profile (UML-CI) and serves as one of the first steps towards building an agent based simulation environment