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 [log in to unmask].
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