FileNewTemplate - Electric Reliability Council of Texas

FileNewTemplate - Electric Reliability Council of Texas

High Impact Transmission Elements (HITEs) Alex Lee OCITF ERCOT Public December 1, 2015 Proposed Development of HITE List Leverage existing analyses of outage impacts to minimize budget impact of NPRR Include outages that have been attributed as causing significant congestion in the past Based on analyses produced for the ROS report Add outages that might have caused significant congestion under different conditions Based on previous outage coordination studies Vet resulting list with stakeholders to identify any outages that should be excluded due to upgrades or other changes Approval by appropriate subcommittee of TAC 2 Historic Congestion due to Outages By Occurrences Identifies transmission constraints that are active or binding three or more times within a calendar month. Attributes these constraints to outages if appropriate From Nov 2014 to Oct 2015: 245 constraints are attributed to 107 outages (some are duplicate). For constraints with over $1 million congestion rent, outages on 43 distinct transmission elements are identified. Type BUS CB LN XF Total ERCOT OCITF 69 kV 2 2 138 kV 2 2 23 2 29 345 kV 2 1 8 1 12 Total 4 3 33 3 43 3 Historic Congestion due to Outages By Area Links Real-Time Congestion to related outage(s). Analyzes top three or four congestion per Load Zone. Criteria: Over $1 million Congestion Rent. From Nov 2014 to Oct 2015: 76 constraints are linked to 59 outages (some are duplicate). For constraints with over $1 million congestion rent, outages on 46 distinct transmission elements are identified. Type BUS CB LN XF Total ERCOT OCITF 69 kV 2 2 138 kV 4 1 28 2 35

345 kV 2 1 5 1 9 Total 6 2 35 3 46 4 Outages Potentially Causing Congestion from Historic OC Studies When ERCOT outage coordination studies indicate that a significant amount of resources must be re-dispatched to accommodate a requested outage, ERCOT sends the requestor a Market Impact Questionnaire. These Questionnaires provide an indication of outages that might cause significant congestion Although these outages may not ultimately result in congestion if they are moved in time or if conditions are different than studied From Jan 2014 Dec 2014: Market Impact Questionnaire was sent out for 57 distinct transmission elements. Type BUS LN XF Total ERCOT OCITF 69 kV 1 1 138 kV 10 19 2 29 345 kV 3 15 8 26 Total 14 35 8 57 5 HITEs Summary TDSP # HITEs AEN 8 AEN/LCRA 1 AEP 22 AEP/Sharyland 1 AEP/STEC 1 Brazos 1 CNP 9 CNP/TNMP 1 CPS 3 LCRA 7 ONCOR 45 ONCOR/Brazos 1 STEC 4 TMPA 1 TNMP 6 WETT 1 Total 112

ERCOT OCITF Type BUS CB LN XF Total 69 kV 1 138 kV 14 2 53 2 71 3 4 345 kV Total 5 20 1 3 22 78 9 11 37 112 No related Transmission outage OR Congestion Rent < $1 mil By Occurrences 12 27 16 By Area No related Transmission outage 3 1 51 2 From OC Studies 6 Sources: HITEs (Page 1) HITE Hamilton AEN HM_950 AEN Dunlap - Decker AEN Dunlap - Techridge Austrop - Daffin DCKT Dessau - Sprinkle Decker - McNeil AEN Decker - Sprinkle Kingsbery - Ed Bluestein McNeil AEN - McNeil LCRA Rio Hondo Bus Lane City Bus North Edinburg Bus Rio Hondo Bus San Diego Bus Ajo - Rio Hondo La Palma - Rio Hondo Lon Hill - North Edinburg Lon Hill - Pawnne Sw Azteca - SE Edinburg Bates - - Garza La Palma - Laureles Laureles - Port Isabel Polk Ave - North Pharr Rio Bravo - - Wormser Rd San Angelo Power - San Angelo Concho Spur - Aspermont Lon Hill - Smith Sinton - - Beeville North Edinburg Auto #1 North Edinburg Auto #2 San Angelo Concho Auto Taylor Sharyland - Sharyland Victoria - Loop 463 Sub

ERCOT OCITF Type kV CB 138 LN 138 LN 138 LN 138 LN 138 LN 138 LN 138 LN 138 LN 138 BUS 345 BUS 138 BUS 138 BUS 138 BUS 69 LN 345 LN 345 LN 345 LN 345 LN 138 LN 138 LN 138 LN 138 LN 138 LN 138 TDSP AEN AEN AEN AEN AEN AEN AEN AEN AEN/LCRA AEP AEP AEP AEP AEP AEP AEP AEP AEP AEP AEP AEP AEP AEP AEP Source R,C C C,M R,M C R,C M R,C R C M C M M M R,C,M M M R,C M C R R,C R,C HITE Whitney Bus Chambers - King Kings - Kuykendahl Kuykendahl - Roans Prairie Kuykendahl - Tomball Exxon - Lynch Fort Bend - - Orchard Fort Bend - Reading Ph Robinson Auto #1 Ph Robinson Auto #2 West Columbia - West Columbia Main Tnp Ballpark - - Olmos Cibolocr - ... - Green_Mt Laredo 1 - Five Pts Schulenburg Bus Fayette Plant 1 - Fayetteville Hays Energy - Kendall

Benedum - Upton Boerne - Welfare Gilleland - McNeil LCRA Bevo Auto #1 Carrollton NW - Lewisville Sw Choate - Four Corners Choate - Pawnee Sw LN 138 AEP R,C East Rio Hondo - ... - Central Ave LN LN LN XF XF XF LN LN C R,C R,C M M R,C C M George West - George West Sw North Denton - Denton Arco Brazoria Bus West Columbia Main Tnp Bus Brazoria Tnp - Clemons Tap Tnp Commanche Switch Tnp - Tejas Tnp Dickinson - Freeway Park West Tnp - Ti Tnp Wett Faraday Bus 138 69 69 345 345 138 138 138 AEP AEP AEP AEP AEP AEP AEP/Sharyland AEP/STEC R = By Occurrences C = By Area M = Historic OC Studies Type kV BUS 138 LN 345 LN 345 LN 345 LN 345 LN 138 LN 138 LN 138 XF 345 XF 345 LN 138 LN 138 LN 138 LN 138 BUS 138 LN 345 LN 345 LN 138 LN 138 LN 138 XF 138 LN 345 LN 138 LN 138 TDSP Source Brazos M CNP M CNP M CNP M

CNP M CNP M CNP M CNP R CNP M CNP M CNP/TNMP M CPS R,C CPS R CPS R,C LCRA M LCRA R,C LCRA M LCRA M LCRA M LCRA C,M LCRA R,C ONCOR/Brazos R STEC M STEC M LN 138 STEC LN LN BUS BUS LN LN LN LN BUS 138 138 138 138 138 138 138 138 345 STEC TMPA TNMP TNMP TNMP TNMP TNMP TNMP WETT R,C M R,C M M M R,C R,C R C 7 Sources: HITEs (Page 2) HITE R = By Occurrences C = By Area M = Historic OC Studies Type kV TDSP

Source HITE Type kV TDSP Source Carrollton Northwest Bus Forney Sw Bus BUS BUS 345 345 ONCOR ONCOR R,M R,M Martin Lake Bus Allen Sw Bus Andrew North Bus Kirkland Park Bus Lake Creek Bus BUS BUS BUS BUS BUS 345 138 138 138 138 ONCOR ONCOR ONCOR ONCOR ONCOR M M C M R,C Calmont Sw - Western Hills Cedar Hill Sw - Mountain Creek Colony - Austin Ranch Eagle Mountain - - Calmont Sw East Levee Sw - West Netowrk LN LN LN LN LN 138 138 138 138 138 ONCOR ONCOR ONCOR ONCOR ONCOR C R,C C R R,C Moss Sw Bus Odess Ehv Sw Bus Stryker Creek Bus Norwood Sw CB 325 Andrew North CB 12365 BUS BUS BUS CB CB

138 138 138 345 138 ONCOR ONCOR ONCOR ONCOR ONCOR R,C M M R,C R LN LN LN LN LN LN LN LN LN LN LN 345 345 345 345 345 345 345 345 345 345 345 ONCOR ONCOR ONCOR ONCOR ONCOR ONCOR ONCOR ONCOR ONCOR ONCOR ONCOR M R,C M M M M M M R R,C R,C Jim Payne - Lamesa Key Sub - Lamesa Lufkin - Nacogdoches South Tap Morgan Creek - Cosden Morgan Creek - Sun Sw Moss Sw - Odessa Southwest Odessa - Odessa North Permian Basin - Wink Sub LN LN LN LN LN LN LN LN 138 138 138 138 138 138 138 138 ONCOR ONCOR ONCOR ONCOR ONCOR ONCOR

ONCOR ONCOR C M M R,C C M M R Sansom - Eagle Mountain Snyder - Sacroc Wink Sub - Wink Gulf Tap LN LN LN 138 138 138 ONCOR ONCOR ONCOR C C R Odessa Basin Sw - Odessa North Carrollton Northwest Auto #1 Everman Sw Auto #3 Lufkin Sw Auto #1 Odessa Ehv Sw Auto #3 Royse Sw Auto #1 LN XF XF XF XF XF 69 345 345 345 345 345 ONCOR ONCOR ONCOR ONCOR ONCOR ONCOR M M M C M R Allen Sw - Monticello Lufkin Sw - Stryker Creek Midland East - Moss Sw Midland East - Odessa Ehv Sw Monticello - Paris Sw Morgan Creek Auto #4 Moss Sw - Odessa Ehv Sw Stryker Creek - Watermill Sw Temple Sw - Bell County East Sw Watermill Sw - Sargent Road Watermill Sw - West Levee Sw ERCOT OCITF 8 Discussion Points Outages for Bus or open-ended-line. Congestion related to multiple outages. HITEs verification/expiration. ERCOT OCITF 9

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