The electric energy grid is a recognized critical infrastructure. It is vulnerable to self-disturbances as well as cyber-attacks. In particular cyber-attacks can cause from mild disruptions to serious damage that may take months or years to repair. The last is a serious threat to the security of the electric energy grid and the nation. We will present the cyber-physical infrastructure of the electric energy grid and the existing vulnerabilities. We will industry effort to secure the electric energy system as well as research activities to harden the system. In particular we will focus on methods which track the state of the system to compare cyber activity to the status of the system. These methods have a higher success performance to data based methods.