NOTICE TYPE: W-A123013-01 Operations
SHORT DESCRIPTION: Implementation of maximum shadow prices for irresolvable non-competitive constraints in SCED
INTENDED AUDIENCE: ERCOT Market Participants
DATES AFFECTED: January 1 and January 29, 2014
LONG DESCRIPTION: ERCOT Business Practice, Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch, Section 3.6.2 requires ERCOT to periodically review 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 Shadow Price for a constraint that continues to be irresolvable by SCED.
Effective January 1, 2014, the following changes to the set of constraints that are consistently irresolvable by SCED will be made:
Contingency Name
Constraint Name
Description
Current Maximum Shadow Price
Maximum Shadow Price effective January 1, 2014
BASE CASE
VALIMP
Valley Import Base Case
$2,000.00
$2,000.00
DGRSLNC5
6856__B
Graham to Long Creek 345 kV
overloads
Bomarton - Seymour 69 kV
$2,000.00
$2,000.00
DW_DDEN8
AIR_W_DE_1
Denton - Argyle / West Denton 138 kV
overloads
Jim Crystal - West Denton 69 kV
$2,000.00
$2,000.00
SNCWHLT9
6915__A
Odessa North to Holt Sw 69 kV
overloads
Odessa Basin Sw - Odessa North 69 kV
$2,800.00
$2,800.00
SNCWMOS8
ODNTH_FMR1
Holt Sw - Moss Sw 138 kV
overloads
Odessa North xfmr
$2,000.00
$2,000.00
SODBODN9
6860__A
Odessa Basin Sw to Odessa North 69 kV
overloads
Holt Sw - Ector Shell Tap 69 kV
$2,320.68
$2,320.68
DODEQAL5
6215__A
Odessa - Morgan Creek / Quail Sw 345 kV
overloads
China Grove to Bluff Creek Switch 138 kV
$2,000.00
$2,000.00
SSUNMGS8
6215__A
Sun Switch to Morgan Creek SES 138 kV
overloads China Grove Switch to Bluff Creek Switch 138 kV
$2,000.00
$3,500.00
XMGS58
MGSES_MR1H
Morgan Creek Autotransformer #4 345 kV/138 kV overloads Morgan Creek Autotransformer #1 345 kV/138 kV
$2,000.00
$2,000.00
XWI2N89
6920_E_1
Wink Tnp Winkat1 138/69 KV overloads Wink Tnp to Wink Substation 69kV
$2,000.00
$2,000.00
Additionally, effective January 29, 2014, the following constraints will no longer be considered irresolvable by SCED:
Contingency Name
Constraint Name
Description
DGRSLNC5
6856__B
Graham to Long Creek 345 kV overloads
Bomarton - Seymour 69 kV
SODBODN9
6860__A
Odessa Basin Sw to Odessa North 69 kV overloads
Holt Sw - Ector Shell Tap 69 kV
DW_DDEN8
AIR_W_DE_1
Denton - Argyle / West Denton 138 kV overloads
Jim Crystal - West Denton 69 kV
SNCWMOS8
ODNTH_FMR1
Holt Sw - Moss Sw 138 kV overloads
Odessa North xfmr
XWI2N89
6920_E_1
Wink Tnp Winkat1 138/69 KV overloads
Wink Tnp to Wink Substation 69kV
Section 3.6 of the business practice document requires a 30-day notice before the shadow price caps for SCED resolvable constraints are reset to their default values. Due to this requirement, the identified constraints will have their shadow price caps changed on January 1, as indicated in the previous table, before being reset to their default shadow price cap values on January 29.
ADDITIONAL INFORMATION: Per Section 3.6.3 of the business practice document, the net margin values for all of the above listed constraints will also be reset to zero on January 1, 2014.
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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