The current PJM tariff limits the amount of DR to 25% of the total amount of each Ancillary Service (day ahead scheduling reserves, synchronized reserves, regulation) requirement. When stakeholders changed the market rules to allow DR to participate in the ancillary service markets, the 25% limit was established primarily because of unknown DR performance for providing these services. PJM committed in a compliance filing (ER09-1063-000) to ask the stakeholders to review the 25% limit when the participation by DR reaches a level near the limit. In March 2012, DR penetration in the Synchronized Reserve Market reached 22.3% of the Mid-Atlantic Requirement for one hour. As a result, PJM initiated the stakeholder process to discuss the issue.