Barrilla - Fort Barrilla to Solstice 138 kV Stockton Switch 4 $46,355 69kV Scurry Switch to Sun Switch Aspermont Aep 4 $29,610 138 kV 69T1 138/69kV Lake Ivey Booster to Lake Coleman Junctin Ivey Intake Pump - Santa Anna 4 $20,038 (6)138/138/138/138/138/138 69kV kV Downie Downie Switching Station to Switching 3 $19,691 Uvalde Aep 138 kV Station AX1H 138/69kV Woodward 1 to Woodward 1 Woodward 2 - Tap (5)138/138/138/138/138 Rio Pecos 5 5535 $15,261 kV 138kV DCKT Gibbons Creek - Jewett - Houston Import 3 $14,105 Singleton 345 kV Singleton 345kV Project Woodward 1 to Woodward 1 Fort Stockton Tap (5)138/138/138/138/138 Plant - Airport 8 $10,913 kV Tnp 138kV Randado Aep - Basecase 9 $5,845 Zapata 138kV Scurry Switch to Sun Switch Wolfgang - 3 $2,015 138 kV Rotan 69kV Generic Transmission Constraint Congestion There were seventeen days on the Panhandle GTC, one day on the North to Houston GTC and days on the Liston GTC in January. There was no activity on the remaining GTCs during the Month. Note: This is how many times a constraint has been activated to avoid exceeding a GTC limit, it does not imply an exceedance of the GTC occurred or that the GTC was binding. Manual Overrides for January None. Congestion Costs for Calendar Year 2017 The following table represents the top twenty active constraints for the calendar year based on the estimated congestion rent attributed to the congestion. ERCOT updates this list on a monthly basis. # of Estimated Transmission Contingency Binding Element Congestion Project SCED Rent Intervals Wagley Robertson - Hcksw-Allnc&Rnksw 345kv 1,429 $ 20,785,800.16 Summerfield 138kV Victoria-V_Dupsw 138kv Formosa - Lolita 138kV 222 $ 5,906,733.06
Barrilla to Solstice 138 kV Barrilla - Fort Stockton Switch 69kV 4 $46,355 Scurry Switch to Sun Switch 138 kV Aspermont Aep 69T1 138/69kV 4 $29,610 Lake Ivey Booster to Lake Ivey Intake Pump (6)138/138/138/138/138/138 kV Coleman Junctin - Santa Anna 69kV 4 $20,038 Downie Switching Station to Uvalde Aep 138 kV Downie Switching Station AX1H 138/69kV 3 $19,691 Woodward 1 to Woodward 1 Tap (5)138/138/138/138/138 kV Woodward 2 - Rio Pecos 138kV 5 $15,261 5535 DCKT Gibbons Creek - Singleton 345 kV Jewett - Singleton 345kV 3 $14,105 Houston Import Project Woodward 1 to Woodward 1 Tap (5)138/138/138/138/138 kV Fort Stockton Plant - Airport Tnp 138kV 8 $10,913 Basecase Randado Aep - Zapata 138kV 9 $5,845 Scurry Switch to Sun Switch 138 kV Wolfgang - Rotan 69kV 3 $2,015 Generic Transmission Constraint Congestion There were seventeen days on the Panhandle GTC, one day on the North to Houston GTC and days on the Liston GTC in January. There was no activity on the remaining GTCs during the Month. Note: This is how many times a constraint has been activated to avoid exceeding a GTC limit, it does not imply an exceedance of the GTC occurred or that the GTC was binding. Manual Overrides for January None. Congestion Costs for Calendar Year 2017 The following table represents the top twenty active constraints for the calendar year based on the estimated congestion rent attributed to the congestion. ERCOT updates this list on a monthly basis. Contingency Binding Element # of SCED Intervals Estimated Congestion Rent Transmission Project Hcksw-Allnc&Rnksw 345kv Wagley Robertson - Summerfield 138kV 1,429 $ 20,785,800.16 Victoria-V_Dupsw 138kv Formosa - Lolita 138kV 222 $ 5,906,733.06
06._January_17_ERCOT_Operations_Report_Public.V2.docx