NOTICE DATE: January 29, 2015
NOTICE TYPE: W-A123114-02 Operations
SHORT DESCRIPTION: Implementation of generic shadow price caps for previously irresolvable constraints in SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAY AFFECTED: January 30, 2015
LONG DESCRIPTION: Market Notice W-A123114-01 Operations, issued on December 31, 2014, indicated that as of January 30, 2015, the following constraints will no longer be considered irresolvable by SCED:
Contingency Name
Constraint Name
Description
Current
Maximum
Shadow
Price
Maximum
Shadow Price
effective
January 30, 2015
DODEQAL5
6215__A
Odessa - Morgan Creek / Quail Sw 345 kV overloads
China Grove to Bluff Creek Switch 138 kV
$2,000
$3,500
SSUNMGS8
6215__A
Sun Switch to Morgan Creek SES 138 kV
overloads China Grove Switch to Bluff Creek Switch 138 kV
$3,500
$3,500
SNCWHLT9
6915__A
Odessa North to Holt Sw 69 kV overloads
Odessa Basin Sw - Odessa North 69 kV
$2,800
$2,800
XMGS58
MGSES_MR1H
Morgan Creek Autotransformer #4 345 kV/138 kV overloads Morgan Creek Autotransformer #1 345 kV/138 kV
$2,000
$4,500
Section 3.6 of the business practice document, Methodology for Setting Max Shadow Prices, requires a 30-day notice before the shadow price caps for SCED resolvable constraints are reset to their default values. As indicated in Market Notice W-A123114-01 Operations, the generic transmission shadow price caps will be used in SCED, in accordance with Section 3.5 of the ERCOT Business Practice document, effective January 30, 2015. Note that for two of the constraints listed above, the previous maximum shadow price calculation resulted in a value equal to the generic cap, so no actual change will be observed by the system on January 30 for these two constraints.
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