The PI System is deployed at Exelon Nuclear in the following manner: PI Server is deployed at eight generating stations in two operating regions: MidWest in Illinois, and MidAtlantic in Pennsylvania; PI Server in the Process Computer network for data acquisition and interface to DAQ hardware; PI Server outside the Process Computer network for plant access and user interaction; User interaction via PI ProcessBook, PI ActiveView, and PI DataLink. This presentation will focus on the ERO uses and benefits of the PI System. Some uses include KPI reporting and custom monitoring; interfacing with Illinois Emergency Management Agency radiation detectors; MidWest Plant Parameter Display System (PPDS) displaying plant data from the Process Computer for Emergency Response Org on-site and at Remote Emergency Ops Facility; custom PI ProcessBook displays used to monitor numerous plant parameters including radiation monitors, reactor feedwater, reactor core, containment pressure, steam flow, turbine and generator output, and chemistry data. We will also touch on our efforts in Cyber Security and the ERDS Modernization Project: modernizing the NRC ERDS system from modem to internet-based communication with the NRC using Virtual Private Network technology. Pilot program began in 2008; modification of legacy ERDS software to use TCP/IP code for proof-of-concept of the NRC VPN hardware. The OSIsoft PItoNRCERDS interface was chosen and purchased to send plant data from each site's PI System to the NRC ERDS Monitoring Desk. The interface is continuously transmitting to the NRC Custom PI System API-based software, which continuously monitors the PItoNRCERDS interface and data quality and pages out IT personnel upon failure modes. We will close with new and upcoming uses for the PI System to include replacing the Chemistry DAS interface with PI-Intellution FIX32/iFIX-NT interface, wireless vibration monitoring and custom ERDS interface dashboard.