In November of 2015, Platte River participated for the first time in GridEx III, the third biennial nationwide tabletop exercise for cyber security preparation. This unique program is organized by NERC and run by the Electricity Information Sharing and Analysis Center (E-ISAC). System Operations and Supervisory Control and Data Acquisition (SCADA) Services represented Platte River and prepared four months for this exercise. Overall the exercise was very beneficial, and it has helped Platte River test its incident response capabilities and coordinate responses with other entities. During GridEx IV in 2017, it is Platte River’s goal to include more departments in this exercise.