PJM staff is bringing this issue forward for consideration based on two sources: 1) The Planning Committee has been discussing switching to an Effective Load Carrying Capability (ELCC) method to calculate the capability of wind and solar units in the capacity market. 2) In response to a paper hearing FERC initiated in Docket No. EL19-100 regarding the capability of energy storage resources, stakeholders have proposed, and PJM supports, switching to an ELCC method to calculate the capability of energy storage resources.