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.
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]>.
If you are receiving email from an ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com.




mm