NOTICE DATE:  January 14, 2011
NOTICE TYPE:  W-A011411-01 Operations
SHORT DESCRIPTION:  Notice of Constraint Competitive List effective for Operating Day January 15, 2011
INTENDED AUDIENCE:  ERCOT Market Participants
DAY AFFECTED:  January 15, 2011
LONG DESCRIPTION:  In accordance with Protocol Section 4.4.11.2(4), ERCOT provides Notice that the Constraint Competitive List will become effective at 00:00 hrs on the 46th Operating Day of the nodal market (January 15, 2011) for the purposes of the two-step SCED methodology in paragraph (5) of Protocol Section 6.5.7.3.
The Constraint Competitive List comprises "Competitive Constraints" which are the contingency/limiting Transmission Element pairs that represent the Commercially Significant Constraints (CSCs) and Closely Related Elements (CREs), as defined immediately prior to Texas Nodal Market Implementation Date (December 1, 2010).
Both the Constraint Competitive List and the Daily Competitive Constraints, as a result of the Daily Competitiveness Test in Protocol Section 3.19.3, are posted on the Market Information System (MIS) Secure Area on the Grid/Transmission page under Daily Competitive Constraints.  At this time, the Daily Competitive Constraints postings are posted with two defects that will be corrected in a forthcoming release:

1)    Daily Competitive Constraints list is missing two generic transmission constraints:

a.    West-to-North Stability Limit (W_TO_N)

b.    North-to-Houston Stability Limit (N_TO_H)

2)    Daily Competitive Constraints list includes partial list of Non-Competitive Constraints so Market Participant should filter the list:

a.    Use constraints in list where CCTStatus column = "COMP"

b.    Ignore constraints where CCTStatus column = "NONCOMP"
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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