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NOTICE DATE: December 31, 2018
NOTICE TYPE: W-A123118-01 Operations
SHORT DESCRIPTION: Change to maximum Shadow Prices for constraints previously determined as irresolvable by SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAY AFFECTED: January 1, 2019 and January 30, 2019
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.
Effective January 1, 2019, the following changes will be made to the set of constraints that remain consistently irresolvable by SCED:
Contingency
Name
Constraint
Name
From Station / kV
Description
Current Maximum Shadow Price ($/MWh)
Maximum Shadow Price Effective 1/1/19 ($/MWh)
BASE CASE
VALIMP
N/A
Valley Import Base Case
2,000.00
2,000.00
SJUNYEL9
HEXT_YELWJC1_1
YELWJCKT / 69
Loss of Yellow Jacket to Junction 69KV line overloading the Yellow Jacket to Hext LCRA 69 kV line
2,000.00
2,000.00
SWINYUC8
M_69_F3_1
WICKETT / 69
Loss of the 138 kV line from Wink Sub to Yucca Drive Switch overloading the 69 kV line from Wickett TNP to Winkler County 6 TNP
2,000.00
2,800.00
DCASTXR8
MHONDOCR_1
MOORE / 138
Loss of the 138 kV double-circuit from Razorback/Txresrch to Castrvll overloading the 138 kV line from Moore Switching Station to Hondo Creek Switching Station
2549.21
3500
SWCSBOO8
BARL_FTSW1_1
FTSW / 69
Loss of the 138 kV line from Fort Stockton Plant to Barilla and Solstice overloading the 69 kV line from Barilla to Fort Stockton Switch
2,800.00
2,800.00
Additionally, effective January 30, 2019, the following constraints will no longer be considered irresolvable by SCED:
Contingency Name
Constraint Name
From Station / kV
Description
SBAKHL48
6596__F
HLTSW / 69
Loss of Bakke Tap to Unocal Parker Bakke 138 kV line overloading the 69 kV line from Emma Tap to Holt Switch
SWCSBOO8
6332__A
YUCSW / 138
Loss of Solstice to Fort Stockton Plant 138 kV line overloading the 138 kV line from Yucca Drive Switch to Gas Pad
Section 3.6 of the Other Binding 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 will have their Shadow Price caps reset to their default Shadow Price cap values on January 30, 2019.
Per Section 3.6.3 of the Other Binding Document, the net margin values for constraints that remain irresolvable by SCED will be reset to zero on January 1, 2019.
ADDITIONAL INFORMATION: The Other Binding Document, Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints, may be found on the Other Binding Documents List<http://www.ercot.com/mktrules/obd/obdlist> page 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]<mailto:[log in to unmask]>.
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