Lon Hill 345_138_2 (3) Rincon - Airco Aep 3 $87,059 08TPIT0132 345/138 kV 138 kV Pawnee Switching Lon Hill - Smith 69 4 $65,814 16TPIT0026 Station - Lon Hill 345 kV kV DCKT Ferguson - Granite Mountain and Wirtz - Flat Rock 8 $44,594 2014-SC10 Wirtz - Starcke - Lcra 138 kV Paleface 138 kV DCKT Rio Hondo - North Edinburg 345 kV Weslaco Switch - and Rio - Hondo Weslaco Sub 138 4 $19,722 3998 Harlingen Switch 138 kV kV Cottonwood Road Shannon - Post 8 $16,100 15TPIT0011 Switch - Loftin 69 kV Oak Switch 69 kV Howard Lane Tap - McNeil - Howard 4 $15,873 Wells Branch 138 kV Lane Tap 138 kV Scurry Switch - Sun Wolfgang - Rotan 3 $7,728 Switch 138 kV 69 kV Bosque Switch - Elm Bosque Switch - 3 $5,244 2014-NC39 Mott 345 kV Rogers Hill 138 kV Cottonwood Road Cottonwood Road Switch - Anarene 3 $2,373 Switch - Olney 69 kV 69 kV There were nine days of activity on the Ajo - Zorillo GTC in March, including six days where it was an ERCOT defined GTC. This GTC was added to address ERCOT identified system stability concerns in the Ajo area during contingency conditions. More information on this new GTC can be found on the . There was no activity on the remaining GTCs during the Month of March. # of Resources Number Date with an of SCED Reason Type Override Intervals 3/25/2015 1 1 Unsolved Contingency HDL Override 2015 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 5-min Estimated Transmission Contingency Binding Element SCED Congestion Project Intervals Rent Topeka Termination - West Cedar Hill Switch - 276 $8,199,323 13TPIT0060 Levee Switch 345 kV Mountain Creek 138 kV DCKT Hill Country - Marion and Marion - Skyline 345 kV 1,043 $7,607,083 4081 Elmcreek 345 kV
Lon Hill 345_138_2 (3) 345/138 kV Rincon - Airco Aep 138 kV 3 $87,059 08TPIT0132 Pawnee Switching Station - Lon Hill 345 kV Lon Hill - Smith 69 kV 4 $65,814 16TPIT0026 DCKT Ferguson - Granite Mountain and Wirtz - Starcke - Paleface 138 kV Wirtz - Flat Rock Lcra 138 kV 8 $44,594 2014-SC10 DCKT Rio Hondo - North Edinburg 345 kV and Rio - Hondo Harlingen Switch 138 kV Weslaco Switch - Weslaco Sub 138 kV 4 $19,722 3998 Cottonwood Road Switch - Loftin 69 kV Shannon - Post Oak Switch 69 kV 8 $16,100 15TPIT0011 Howard Lane Tap - Wells Branch 138 kV McNeil - Howard Lane Tap 138 kV 4 $15,873 Scurry Switch - Sun Switch 138 kV Wolfgang - Rotan 69 kV 3 $7,728 Bosque Switch - Elm Mott 345 kV Bosque Switch - Rogers Hill 138 kV 3 $5,244 2014-NC39 Cottonwood Road Switch - Olney 69 kV Cottonwood Road Switch - Anarene 69 kV 3 $2,373 There were nine days of activity on the Ajo - Zorillo GTC in March, including six days where it was an ERCOT defined GTC. This GTC was added to address ERCOT identified system stability concerns in the Ajo area during contingency conditions. More information on this new GTC can be found on the . There was no activity on the remaining GTCs during the Month of March. Date # of Resources with an Override Number of SCED Intervals Reason Type 3/25/2015 1 1 Unsolved Contingency HDL Override 2015 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 5-min SCED Intervals Estimated Congestion Rent Transmission Project Topeka Termination - West Levee Switch 345 kV Cedar Hill Switch - Mountain Creek 138 kV 276 $8,199,323 13TPIT0060 DCKT Hill Country - Marion and Elmcreek 345 kV Marion - Skyline 345 kV 1,043 $7,607,083 4081