Tata Power is India’s no. 1 private power utility. Tata Power has presence in thermal, hydro, wind, solar generation, transmission and distribution. PI system is installed in all generating stations except wind and being done in Transmission & Distribution in the near future. PI System is primarily utilized in Tata Power for KPI monitoring. Data accuracy is vital in such functions; hence data quality enhancements were required. In addition to this PI system is used for various applications such as ABT applications, Plant performance monitoring / improvements, Heat Balance Diagram & Energy Balance Diagram. Predictive analysis of critical plant parameters from PI data are done by using third party tools.