This document identifies the methodology for determining System Operating Limits (SOLs) and Interconnection Reliability Operating Limits (IROLs), in the planning and operations time horizons, as required by NERC FAC-010 and FAC-011 to be used by the ERCOT Planning Authority/Reliability Coordinator as well as all applicable NERC Registered Transmission Operators and Transmission Planners in the ERCOT Region