Operations

Thu, Dec 31, 2020 11:01 AM

W-A123120-01 Change to maximum Shadow Prices for constraints previously determined as irresolvable by SCED


NOTICE DATE:  December 31, 2020

NOTICE TYPE:  W-A123120-01 Operations

SHORT DESCRIPTION:  Change to maximum Shadow Prices for constraints previously determined as irresolvable by SCED

INTENDED AUDIENCE:  ERCOT Market Participants

DAYS AFFECTED:  January 1 and 30, 2021

LONG DESCRIPTION:  Section 3.6.2 of the Other Binding Document, Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints, requires ERCOT to review annually each constraint previously determined irresolvable by Security-Constrained Economic Dispatch (SCED) and determine (1) if the constraint has become SCED resolvable, and, if not, (2) re-determine the maximum Shadow Price for a constraint that continues to be irresolvable by SCED.

Effective January 1, 2021, the following constraints will be kept as irresolvable by SCED with the re-determined maximum Shadow Prices:

Contingency Name

Constraint Name

From Station / kV

Description

Current Maximum Shadow Price ($/MWh)

Maximum Shadow Price Effective 1/1/2021 ($/MWh)

BASE CASE

VALIMP 

N/A

Valley Import Base Case

2000

2000

DNEDWED8

AZTECA_HEC1_1

HEC/ 138

Loss of the 138 kV double-circuit between North Edinburg  (NEDIN) and West Edinburg Tap (MV_WEDN4) overloads the 138 kV line from Hidalgo Energy Center (HEC) to Azteca Sub (AZTECA)

2000

2000

SMV_ALT8

479T479_1

WESLACO/ 138

Loss of West Ednburg Sub (MV_WEDN4) to Alton Sub (ALTON_MV) 138kV Line overloads the 138kV line from Weslaco Switch (WESLACO) to North Alamo (N_ALAMO)

2000

2000

SPHAWES8

KEY_SW_N_MCAL1_1

KEY_SW/ 138

Loss of North Pharr (PHARR) to Weslaco Switch (WESLACO) 138kV Lines overloads the 138kV line from Key Switch (KEY_SW) to North McAllen (N_MCALLN)

2000

2000

SHACPB38

LYNX_TOMBST1_1

LYNX/ 138

Loss of the 138 kV line between Yucca Drive Switch  (YUCSW) and Lotebush (LOTEBUSH) overloads the 138 kV line from Lynx (LYNX) to Tombstone (TOMBSTNE)

2000

2000

 

Additionally, effective January 30, 2021, the following constraints will no longer be considered irresolvable by SCED:

Contingency Name

Constraint Name

From Station / kV

SSOLFTS8

BARL_FTSW1_1

FTSW/  69

DWINDUN8

6100__F

DHIDE/ 138

DYKNWIN8

6100__F

DHIDE/ 138

DWINDUN8

6100__G

ACSSW/ 138

SECNMO28

6100__G

ACSSW/ 138

SECNMO28

6100__F

DHIDE/ 138

XFRI89

SONR_69-1

SONR/ 138

SHACPB38

RIOPEC_WOODW21_1

RIOPECOS/ 138

 

Section 3.6 of the Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints document requires a 30-day notice before the Shadow Price caps for SCED resolvable constraints are reset to their default values. Accordingly, the identified constraints above will have their Shadow Price caps reset to their default Shadow Price cap values on January 30, 2021.

ADDITIONAL INFORMATION:  The Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints document can be found on the Real-Time Market, and Other Binding Documents List pages of the ERCOT website.

CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at ClientServices@ercot.com.

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