While providers of demand response resources are subject to RERRA “opt-in/opt-out” provisions, providers of Energy Efficiency Resources are not. Energy Efficiency Resources became a product eligible for participation in the PJM Base Residual Auction for Delivery Year 2012/13, but the “opt in/opt out” provisions were not modified to include a reference to Energy Efficiency Resources nor was a new separate provision created establishing a review of RERRA determinations regarding Energy Efficiency Resource aggregation registrations.