California Independent System Operator (CAISO) is a nonprofit public corporation created by State of California. It manages the flow of electricity, ensures reliable operation of the grid, and facilitates market for day-ahead, real-time energy & ancillary services. CAISO serves 30 million populations and has about 55,000 MW generation capacity and 50,000 peak load demand. CAISO has been using PI System since year 2000 and been a PI Enterprise Agreement customer for several years. This presentation will demonstrate how CAISO utilizes PI to support the real-time operations and grid reliability, including some creative showcase PI displays built by operators and engineers. PI displays are heavily used on the dispatcher’s consoles for 24/7 real-time monitoring, on engineer’s desktops for day-to-day operations support and analysis, on the control center video walls for situational awareness, and on web portal for external market participants, government entities and regulatory agencies. The speaker will also cover CAISO Smart Grid vision, such as synchrophasor technology and California Climate Change Initiatives. The presentation will also show that PI System is the key technology to enable CAISO to operate the grid reliably, securely and efficiently and facilitate effective, open markets that engage and empower consumers while meeting California's policy target to integrate renewable resources, reduce greenhouse gas emissions, and secure energy independence.