1. Market Trials Open Market Participant Call
Weekly Kick Off
November 22, 2010 1

2. Antitrust Admonition ANTITRUST ADMONITION
ERCOT strictly prohibits Market Participants and their employees who are participating in ERCOT activities from using their participation in ERCOT activities as a forum for engaging in practices or communications that violate the antitrust laws. The ERCOT Board has approved guidelines for members of ERCOT Committees, Subcommittees and Working Groups to be reviewed and followed by each Market Participant attending ERCOT meetings. If you have not received a copy of these Guidelines, copies are available at the Client Relations desk. Please remember your ongoing obligation to comply with all applicable laws, including the antitrust laws.
DISCLAIMER
All presentations and materials submitted by Market Participants or any other Entity to ERCOT staff for this meeting are received and posted with the acknowledgement that the information will be considered public in accordance with the ERCOT Websites Content Management Operating Procedure. 2

3. This Week’s Activities – Soft Launch – 9 Days Until Go-Live
RTM / LFC
Submissions representative of a post go-live scenario
Detailed Discussion on generation cutover on Wednesday 10:30 AM meeting
DAM / RUC
DAM will run daily based on protocol timelines
DRUC run daily
Results based on unrealistic COPs versus actual resource availability
HRUC run hourly
SASM will run if necessary
High Regulation Prices (Saturday / Sunday)
Due to AS Insufficiency as a result of very low participation
52 QSEs Participating on Saturday and 49 QSEs Participating on Sunday
Late Publication on Saturday (2pm)
REMINDER: COPs are required for post go-live dates (7 days) starting on 11/24/2010
CRR - LIVE
11/22/2010 – Payments to CRRAH
11/24/2010 – Open Credit window for January 2011 Monthly Auction
Outage Scheduler - LIVE
Realistic outages for effective operational dates post Go-Live
Dual entry for 12/1/2010 3

4. General Reminders Twice Daily Market Calls begin tomorrow 11/23/2010
10:30 AM morning call
4:30 PM afternoon call
Details are posted on the ERCOT Calendar website: 4

5. Real Time Market Update
11/18 – 11/21 System Lambda at $180 offer cap for 246 intervals
11/18 – 11/21 System Lambda above $180 for 114 intervals 5

6. Real Time Market Update
SCED intervals not at offer cap or higher typically between $20 and $40
11/18 – 11/21 Three constraints; only W_TO_N was ever binding for a short period of time on 11/17
BASE CASE - W_TO_N – active 11/19 – 11/21; binding on 11/20
DGRSLNC5 6380_D_1 – never binding
SSPUASP8 MATA_PADR1_1 – binding 11/21 after 8 pm 6

7. http://nodal.ercot.com 7