Coastal 1 5/24/16 4 676 Local Congestion Southern 1 5/23/16 6 262 Local Congestion Coastal 1 5/26/16 11 4518 Local Congestion Coastal 1 5/26/16 11 4518 Local Congestion Coastal 1 5/26/16 11 4518 Local Congestion Coastal 2 5/27/16 10 3947 Local Congestion Coastal 1 5/31/16 9 3778 Local Congestion Coastal 1 5/31/16 9 3778 Local Congestion Wind Generation as a Percent of Load Congestion Analysis The number of congestion events experienced by the ERCOT system increased in May. There were sixty instances of activity on the Generic Transmission Constraints (GTCs) in May. Notable Constraints for May Nodal protocol section 3.20 specifies that ERCOT shall identify transmission constraints that are active or binding three or more times within a calendar month. As part of this process, ERCOT reports congestion that meets this criterion to ROS. In addition ERCOT also highlights notable constraints that have an estimated congestion rent exceeding $1,000,000 for a calendar month. These constraints are detailed in the table below. Rows highlighted in blue indicate the congestion was affected by one or more outages. For a list of all constraints activated in SCED for the month of May, please see Appendix A at the end of this report. # of Days Estimated Transmission Contingency Overload Constraint Congestion Project Active Rent Meadow AT1 Meadow to Ph Robinson 345 KV 2 $ 6,552,987.55 4708 345/138kV Lewisville Switch - Krum West Fort Worth Switch and Roanoke Switch 345 Subsation - West 6 $ 5,462,367.54 kV Denton 138kV South Carbide to Loma Alta La Palma - Villa 11 $ 5,060,645.62 Substation 138 KV Cavazos 138kV Meadow AT1 Ph Robinson At4_H (3)345/138 KV 1 $ 3,994,537.45 4708 345/138kV Ph Robinson At1l_H (3)345/138 Meadow AT1 3 $ 3,942,970.86 4708 KV 345/138kV Basecase Valley Import 3 $ 3,402,231.72
Coastal 1 5/24/16 4 676 Local Congestion Southern 1 5/23/16 6 262 Local Congestion Coastal 1 5/26/16 11 4518 Local Congestion Coastal 1 5/26/16 11 4518 Local Congestion Coastal 1 5/26/16 11 4518 Local Congestion Coastal 2 5/27/16 10 3947 Local Congestion Coastal 1 5/31/16 9 3778 Local Congestion Coastal 1 5/31/16 9 3778 Local Congestion Wind Generation as a Percent of Load Congestion Analysis The number of congestion events experienced by the ERCOT system increased in May. There were sixty instances of activity on the Generic Transmission Constraints (GTCs) in May. Notable Constraints for May Nodal protocol section 3.20 specifies that ERCOT shall identify transmission constraints that are active or binding three or more times within a calendar month. As part of this process, ERCOT reports congestion that meets this criterion to ROS. In addition ERCOT also highlights notable constraints that have an estimated congestion rent exceeding $1,000,000 for a calendar month. These constraints are detailed in the table below. Rows highlighted in blue indicate the congestion was affected by one or more outages. For a list of all constraints activated in SCED for the month of May, please see Appendix A at the end of this report. Contingency Overload # of Days Constraint Active Estimated Congestion Rent Transmission Project Meadow to Ph Robinson 345 KV Meadow AT1 345/138kV 2 $ 6,552,987.55 4708 Lewisville Switch - Krum West Switch and Roanoke Switch 345 kV Fort Worth Subsation - West Denton 138kV 6 $ 5,462,367.54 South Carbide to Loma Alta Substation 138 KV La Palma - Villa Cavazos 138kV 11 $ 5,060,645.62 Ph Robinson At4_H (3)345/138 KV Meadow AT1 345/138kV 1 $ 3,994,537.45 4708 Ph Robinson At1l_H (3)345/138 KV Meadow AT1 345/138kV 3 $ 3,942,970.86 4708 Basecase Valley Import 3 $ 3,402,231.72
05._May_16_ERCOT_Operations_Report_Public.docx