Energy-related Opportunity Cost is revenue not earned by dispatchable resources because their energy output was reduced at the direction of PJM dispatch. Currently, Opportunity Cost is calculated differently when utilized for different purposes in various parts of the Tariff and Manuals. PJM staff recommends that stakeholders consider unifying the energy-related Opportunity Cost calculations throughout the PJM market rules such that it is calculated consistently across its various purposes. As PJM’s market rules have evolved, it has been necessary to determine a resource’s energy-related Opportunity Cost for various purposes. As each such occasion has occurred, the energy-related Opportunity Cost calculation was developed without regard to consistency. PJM staff believes that PJM’s market rules would benefit from such consistency.