Explanation of Demonstration: (1) Demonstration of a realistic CPS Security Testbed for the power grid and its use-cases for research experimentation, education, and industry cybersecurity training. (2) Demonstration of real cyber attack-defense scenarios, such as Ukraine 2015 and 2016 attacks and suitable mitigations. (3) Demonstration of advanced wide-area protection and control applications, such as oscillation monitoring and control, automatic generation control, and remedial action schemes.