1. EDS 3 Release 5 and 6 Friday Market Updates Sept 05, 20081

2. Submission Metrics Update Updates / Questions / Reminders
Agenda
Antitrust Admonition
SCED Update
Submission Metrics Update
Updates / Questions / Reminders
LFC / State Estimator Update
Q&A / Open Forum
Roll Call 2

3. 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. 3

4. Submission Metrics Update
8/23/2008
8/24/2008
8/25/2008
8/26/2008
8/27/2008
N/A
85% 17
86% 14 16
87%
92%
COP
TPO
IDO OS
8/28/2008
8/29/2008
8/30/2008
8/31/2008
9/1/2008
N/A
86% 17
82% 16
79% 18
77%
COP
TPO
IDO OS
9/2/2008
9/3/2008
9/4/2008
9/5/2008
N/A
70% 20 Q 17
87% 15
91% 14
COP
TPO
IDO OS
Submit the following for each trade date:
Three Part Offer or Output Schedule
EOC only required. Should cover 80 – 120% of cost
Min Energy / Start-up may be zero’d out
FIP/FOP must sum to 100%
COP
Only required if submitting an Output Schedule
No updates in the adjustment period required
Note: a COP is also required in order to submit during the adjustment period (this will be changed to a warning in the next release of MMS  MMS4) 4

5. Updates / Questions / Reminders
Unplanned Environment Outages
MMS
9/03 09:30 – 10:00AM LMP Reports not publishing to MIS. Middleware process hung – bounced services to resolve.
EIP Version 1.16 Sandbox Deployment
Follow-up – Both, 1.16 EIS Spec and XSD’s have been posted to the readiness center
EIS Specification:
XSD’s
Maintenance this weekend
The maintenance is not believed to affect the EDS environment 5

6. Updates / Questions / Reminders
Technical Communications Workshop
Occurred as scheduled on 9/3
ERCOT will host a follow-up next week to cover items we did not have time for in the workshop
Market notice will be sent out today with date / times (No RSVP required)
Sample of Action Items:
Walk through sample JAR files included in the ‘Who am I’ and ‘Boomerang’ samples
Consider adding the following sections to the EIP Spec:
Certificate and Keystore generation
Breakdown of certs, where they are obtained and what they are used for
Consider providing a Listener example
Accept EIS changes on a weekly basis
Notifications over WAN
Issues continued to be worked 6

7. LFC Update: Focused SE Days
Remaining Focused State Estimator Input Days
Start date and time
End date and time
September 8 12:00 am
September 12 11:59 pm
Note: Next Week’s test starts on Monday and is a full 5 day test
ERCOT has posted the results for 8/12 – 8/14 Focused Input Days on the Readiness Center: 7

8. LFC Phase III SE Focused Input Testing 8/26 – 8/28
8/26/08 convergence for day: 92.31%
8/27/08 convergence for day: 97.31%
8/28/08 convergence for day: 96.62% 8

9. State Estimator Focused Input Windows 8/26 – 8/28
Summary of Observations 8/26 – 8/28
The following issues affected the test results
Telemetry errors were lower then the previous test periods
Mismatch between Zonal & Nodal Generation
Convergence during the test period was 95.41%. 100% convergence was achieved in 56 of the 72 test hours 9

10. LFC Phase III SE Focused Input Testing 9/02 – 9/04
9/02/08 convergence for day: %
9/03/08 convergence for day: %
9/04/08 convergence for day: %
Full report will be made available the week of 9/15/08

11. Q&A
Q&A / Open Forum