Sirajul Chowdhury is a principal power systems engineer at the California Independent System Operator (CAISO), based in Folsom, California since October 1999, where he has contributed to the reliable and efficient operation of one of the largest electric grid systems in North America

Sirajul had leading contribution in zonal market to nodal market (MRTU) transition at California ISO and RC integration. 

Chowdhury implemented first Storage control design at California ISO in 2020 within the organization’s Energy Management System, a critical tool used for real-time monitoring and reliability of the electric grid. His work has encompassed the architectural framework for data transfers in and out of the State Estimator to support real-time operations, including market and reliability applications used as a reliability coordinator. 

Chowdhury has also collaborated with the National Renewable Energy Laboratory (NREL) and First Solar on a landmark demonstration project testing the ability of a large utility-scale solar photovoltaic power plant to provide essential ancillary services to the electric grid. 

His expertise extends to the integration of renewable resources, including addressing the operational and electricity market challenges associated with incorporating high levels of wind, hybrid, co-located, DER, V2G resources and solar generation into EMS.

He has additionally contributed to research on predicting regulation reserve requirements within the CAISO balancing authority area, supporting grid stability as renewable penetration continues to grow.

Chowdhury has co-authored multiple technical papers and presentations and has been a contributor to IEEE Power & Energy Society conferences, reflecting his commitment to advancing knowledge in power systems engineering.

His professional interests include control system design, WEIM energy market, Automatic Generation Control (AGC), Network applications, Load forecast, Operator Training Simulator (OTS) and Control room modernization initiatives to improve situational awareness. 

He represented CAISO in Performance Work Group (PWG) to enhance and review various NERC and WECC Standards. 

He worked at Landis & Gyr/Telegyr Systems as a senior power system engineer from 1990 to 1999.