Contingency Name Overloaded Element # of Days Constraint Active Congestion Rent Transmission Project 345kV Blue - Wagley Robertson 138kV 3 $13,878,112.46 Wagley Robertson (2076) - Blue Mound (2071) 138-kV line upgrade (2017RTP NC10) DMTSW-SCOSW 345KV Knapp - Scurry Chevron 138kV 16 $4,738,134.80 Ennis Creek - Cogdell 69 kV Line (4554) & Ennis Creek 138 kV Switching Station (6269) Navarro - WTRML 345KV Britton Road - Venus Switch 345kV 2 $3,556,162.42 Upgrade Existing Hill Sw. Sta. 345 kV Double Ckt Line (5492) 138kV North Edinburg - North Mcallen 138kV 3 $3,232,847.15 North McAllen (8368) - North Edinburg (8380) 138-kV line upgrade PHARR to POLK AVENUE LIN 1 North Mcallen - West Mcallen 138kV 2 $2,409,879.02 North McAllen (8368) - West McAllen (8367) - South McAllen (8371) 138-kV line upgrades (2017-S9) MESA VIEW SWITCH to FORT LANCASTER LIN 1 Hargrove - Twin Buttes 138kV 4 $2,050,438.17 Twin Buttes Autotransformer Addition (5270 B) FERGUSON to SHERWOOD SHORES LIN 1 Cedar Valley - Trimmier 138kV 1 $1,949,571.26 138kV Flat Rock Lcra - Wirtz 138kV 5 $1,721,766.00 to FlatRock to Paleface Transmission Line Upgrade (4465)
PH ROBINSON to MEADOW LIN A Seminole Tnp - Friendswood Tnp 138kV 3 $214,820.19 Friendswood Genration (13INR0049) Transmission Network (5140) Basecase Solstice - Linterna 138kV 18 $213,119.24 Far West Texas Project MOORE SWITCHING STATION to DOWNIE SWITCHING STATION LIN 1 Downie Switching Station 138/69kV 11 $197,167.08 Shores & Mountain 138kV Starcke - 138kV 7 $95,659.34 Berghe-Kendal & Welfar 138kv Kendall - Cagnon 345kV 3 $82,093.77 FRIEND RANCH to SONORA LIN 1 Atlantic Sonora - Sonora 69kV 4 $73,544.30 Carver: Build new 138 kV station (5979) LAQUINTA to LOBO LIN 1 Bruni Sub 138/69kV 3 $44,853.24 Holland 69 kV Capacitors (5805) JARDIN to DILLEY SWITCH AEP LIN 1 Dilley Switch Aep - Cotulla Sub 69kV 3 $33,883.24 Rebuild Cotulla to Big Wells 69kV line Pig Creek to Solstice LIN 1 Airport Tnp - 16th Street Tnp 138kV 4 $28,529.67 GAS PAD to FLAT TOP TNP LIN 1 Ih 20 Tnp - Pecos Tnp 69kV 4 $20,014.96 NORTH McCAMEY to ODESSA EHV SWITCH LIN 1 Fort Stockton Plant - Linterna 138kV 3 $14,761.56 Far West Texas Project Solstice to LINTERNA LIN 1 Alpine - Bronco 69kV 4 $6,718.83 Saragosa to Solstice: Rebuild 138 kV line Generic Transmission Constraint Congestion There were 12 days on the Panhandle GTC and 1 day on North-Houston GTC in September. 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 None.
Congestion Costs for Calendar Year 2018 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 Solstice to LINTERNA LIN 1 Yucca Drive Switch - Gas Pad 138kV 17,620 251,851,642.32 Yucca Junction (4549) Basecase PNHNDL GTC 27,124 98,457,107.57 LP&L Option 4ow & Panhandle Loop (5180, 5208) CRLNW-LWSSW 345kV Carrollton Northwest - Lakepointe Tnp 138kV 13,115 60,311,425.16 Oncor_NW Carrollton - LakePointe (5488) LEWISVILLE SWITCH to JONES STREET TNP LIN _A Ti Tnp - West Tnp 138kV 3,103 35,839,701.17 Congestion Management Plan # 4 and Stewart Road: Construct 345 kV cut-in (5604) EMSES-SAGNA 138kV Blue - Wagley Robertson 138kV 6,326 35,676,195.49 Wagley Robertson (2076) - Blue Mound (2071) 138-kV line upgrade (2017RTP NC10) EDINBURG TRX 1382 345/138 North Edinburg 345/1kV 1,460 35,354,554.62 Stewart Road: Construct 345 kV cut-in (5604) DMTSW-SCOSW 345KV Knapp - Scurry Chevron 138kV 11,563 21,960,230.71 Ennis Creek - Cogdell 69 kV Line (4554) & Ennis Creek 138 kV Switching Station (6269) Basecase VALIMP GTC 601 19,938,471.66 La Palma Dynamic Reactive (5588) and Pharr Dynamic Reactive (5596) Ryssw-Forsw 345kV Forney West - Forney Switch 138kV 1,735 16,044,364.37
SN-STR26 & BFP-VL82 Hofman - Basf 138kV 1,212 15,639,411.86 Bronco to ALPINE LIN 1 Solstice - Linterna 138kV 13,053 15,595,410.31 Far West Texas Project 345kV Blue Mound - Wagley Robertson 138kV 921 15,529,710.27 Wagley Robertson (2076) - Blue Mound (2071) 138-kV line upgrade (2017RTP NC10) Castrvll-Razorbac&Txresrch 138kV Hondo Creek Switching Station - Moore Switching Station 138kV 605 15,342,875.43 Elmcreek-Sanmigl Pawnee Switching Station - Calaveras 345kV 2,108 14,407,954.05 WOLF SWITCHING STATION to Monahans Tap 2 LIN _G General Tire Switch - Southwestern Portland Tap 138kV 2,645 13,959,263.32 WOODWARD 1 TAP to WOODWARD 1 LIN 1 16th Street Tnp - Woodward 2 138kV 2,632 13,666,794.32 Far West Texas Project NORTH PHARR to POLK AVENUE LIN 1 North Mcallen - West Mcallen 138kV 1,165 13,282,240.37 North McAllen (8368) - West McAllen (8367) - South McAllen (8371) 138-kV line upgrades (2017 RTP S9) Jewet-Sng 345kV Btu_Jack_Creek - Twin Oak Switch 345kV 5,627 12,081,985.71 Houston Import Project (4458) MOSS SWITCH to YUCCA DRIVE SWITCH LIN _A General Tire Switch - Southwestern Portland Tap 138kV 2,344 11,535,045.00 LON HILL TRX LON_HILL_3_2 345/138 Lon Hill 345/1kV 1,587 11,412,928.00 Lon Hill: Replace 345/138 kV autotransformers (6106) System Events ERCOT Peak Load The unofficial peak load for the month was 64,606 MW and occurred on September 18th, during hour ending 17:00. Load Shed Events None.