©ISTOCKPHOTO.COM/FANDIJKI PJM Integrates Energy Storage Their Technologies and Wholesale Products By Hong Chen, Scott Baker, Scott Benner, Aaron Berner, and Jianwei Liu september/october 2017 P PJM INTERCONNECTION (PJM) WAS THE FIRST U.S. INDEPENDENT system operator/regional transmission organization (ISO/RTO) to demonstrate how battery energy storage resources provide frequency regulation services in a competitive market. Since its first pilot in 2009, PJM has integrated nearly 300 MW of advanced energy storage resources into its market. During this time period, ISOs/RTOs have developed rules to allow energy storage resources to participate in wholesale electricity markets. The Federal Energy Regulatory Commission (FERC) and state lawmakers have also taken steps to create an environment in which energy storage resources play an increasing role in the reliable operation of the power grid. This article outlines the storage technologies operating in PJM today and the wholesale products Digital Object Identifier 10.1109/MPE.2017.2708861 Date of publication: 17 August 2017 1540-7977/17©2017IEEE ieee power & energy magazine 59http://www.ISTOCKPHOTO.COM/FANDIJKI