Electrical infrastructures being the backbone of society become one of the prime targets for unethical actors in the cyberspace. Electrical outages have a direct impact on the society. This paper focuses on the need for cybersecurity practices within Industrial Control Systems. The discussion highlights cybersecurity threat vectors and the architecture design to mitigate threats using firewalls, IDS/IPS and DMZs. In addition to technological security mechanisms and security policies, procedures and standards also help in strengthening the layered security mechanism of Defense in Depth. This paper deliberates on the importance of log management, patching, system hardening and periodic assessments to proactively take a system wide defensive approach for mitigating cybersecurity threats.