Removes reference to Operating Guides and establishes 50% as the maximum limit for the quantity of Loads acting as Resources that can provide Responsive Reserve Service (RRS) and also allows ERCOT to adjust the 50% limit monthly on a planned basis and daily on an emergency basis if such a limit could adversely impact reliability or deployment of Regulation. This PRR also specifies how the total ERCOT quantity would be divided among QSEs.