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Market TrialsReal-Time Market / LFC

Weekly Update

August 20, 2010

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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.

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Agenda

• Antitrust Admonition

• Environment Report– Planned / unplanned outages – Known Issues

• Standing Reports and Updates– General reminders / updates– Real Time Market / LFC Update– State Estimator Convergence Statistics– 24 Hour Full System Market and Reliability Test Update– General Full System Market and Reliability Test Update

• Question and Answers / General Discussion

ERCOT asks that Market Participants log into the WebEx session using their company name and then their name. This will allow ERCOT to take roll-call offline

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Day-to-day operations summary: Planned / Unplanned Outages of Market Trials

• Planned Outages

• 08/20/2010 12:00 P.M. – 08/20/2010 6:00 P.M.

– Application patch deployments are planned in the Nodal production environment and will intermittently affect services rendered by the following systems:

» EWS ( Web services)

• Unplanned Outages

• 08/13/2010 09:00 A.M. – 08/13/2010 11:00 A.M.

– A Hardware outage on one of our AIX frames in the Austin datacenter forced an emergency site failover of the Nodal production systems over to the Taylor center. ERCOT’s infrastructure team, along with IBM, is investigating the cause of the failure. The following application services were affected as a result of this outage.

» MMS» EWS » MM-UI

• 08/16/2010 8:00 A.M. – 08/16/2010 09:30 A.M.

– Users experienced issues with downloading reports via URLs provided by the EWS Get Reports service. An incorrect application configuration was identified as the root cause of the issue.

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Known Issues

Recently Open• None to report

Recently Closed• NP6-584-Security Violations and Binding Transmission Constraints (MIS Secure)

– Report name in MIR was incorrect

• Actual Name: Security Violations SummaryExpected Name: Security Violations and Binding Transmission Constraints

– Affected EDW

• NP5-649: Temporarily Removed Contingencies (MIS Secure)

– Added column "Reason_for_Removal" to track operator-entered text justification for temporary removal of contingencies.

– Affected CDR

• Shift Factor Issue #1–

– During the August 4th – 5th 24-Hour Test, there were three intervals (1815, 1835 and 1850) wherein shift factors were observed to not be passing to SCED

– The fix for this issue was implemented prior to the August 19th – 20th full-system test

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Standing Reports and Updates: General Reminders / Updates

Reminders/Updates• Updates to Tracking Artifacts

– The Known Issues tracking sheet will refresh overnight to the Readiness center at http://nodal.ercot.com/readiness/markettrials/rtm/index.html

• Network Model Update– The network model database was updated on Wednesday 8/18/2010– The next network model database load will occur Wednesday 9/1/2010

• Update: Outage Scheduler with Zonal Outage Transfer• Purging of test data and Zonal to Nodal Transfer completed the morning of

8/16/2010 as planned at 10:30 AM

• TSPs / QSEs should now be working on validating outages effective for September, 2010 and December 1, 2010 and later.

• Reminders:• Resource Outages were not transferred by design

• Request list of Outages not transferred from MarketTrials@ERCOT.com

• Send email to Market MarketTrials@ERCOT.com confirming outages have been validated by 9/17 for all Outages December and beyond

• First production pull of OS data is scheduled for 10/2 for the first CRR Auction

Standing Reports and Updates: General Reminders / Updates

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Reminders/Updates

• Submissions window extended to 14 days

• As of 8/17, the submission window for COPs, Bids/Offers, and Output Schedules has been extended to 14 days. 

• This functional change allows MPs to better manage their submission data

• 168-Hour Handbook V2.1 Published

• Version approved at NATF and TAC

• Reviewed with the Board of Directors

• Posted at http://nodal.ercot.com/readiness/markettrials/index.html

04/20/23

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Real Time Market / LFC Update

Real Time Market / LFC Update

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SCED Week 29•System Lambda at $2250 offer cap or higher for 373 intervals (compared to 425 last week)•From 8/12 – 8/16, average of 1200MW dispatched away from units where LDL has been set to HDL due to bad telemetry•From 8/17 – 8/18, average is only 300MW, resulting in reasonable prices•Primary cause is actual generation > HSL

24 hour test

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$0

$20

$40

$60

$80

$100

12:0

0

13:0

0

14:0

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15:0

0

16:0

0

17:0

0

Sett

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oint

Pric

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SPPs during 24-hour Test August 19, 2010

LZ_HOUSTON

HB_HOUSTON

LZ_NORTH

HB_NORTH

LZ_SOUTH

HB_SOUTH

LZ_WEST

HB_WEST

LZ_AEN

LZ_CPS

LZ_LCRA

LZ_RAYBN

HB_HUBAVG

Zonal

LZ_AEN $210 @14:15

New Garfield_AT1 constraint violated by 11MW in first

interval; $3500 SP

24 hour test

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-$10

$0

$10

$20

$30

$40

$50

$60

$70

$8018

:00

19:0

0

20:0

0

21:0

0

22:0

0

23:0

0

Sett

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Pri

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SPPs during 24-hour Test August 19, 2010

LZ_HOUSTON

HB_HOUSTON

LZ_NORTH

HB_NORTH

LZ_SOUTH

HB_SOUTH

LZ_WEST

HB_WEST

LZ_AEN

LZ_CPS

LZ_LCRA

LZ_RAYBN

HB_HUBAVG

Zonal

Odessa constraint violated; $2800 SP

23:30 W-to-N activated (constrained all night)

22:30 BMRTN to SMOUR activated

24 hour test

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-$10

$0

$10

$20

$30

$40

$500:

00

1:00

2:00

3:00

4:00

5:00

Sett

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SPPs during 24-hour Test August 20, 2010

LZ_HOUSTON

HB_HOUSTON

LZ_NORTH

HB_NORTH

LZ_SOUTH

HB_SOUTH

LZ_WEST

HB_WEST

LZ_AEN

LZ_CPS

LZ_LCRA

LZ_RAYBN

HB_HUBAVG

Zonal

2:20am & 2:45am: AUSSND constraint unresolved by TCM; no SF passed to SCED (known issue)

Price excursion due to 2000 MW over-generation due to

bad HSL telemetry

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State Estimator Convergence

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State Estimator Convergence Update

State Estimator Daily Convergence Statistics(these percentages are graphed in the next slide)

Month Day % Convergence (Including Solved w/

Mismatch) AUG 9 99.50%AUG 10 98.90%AUG 11 90.66%AUG 12 97.21%AUG 13 80.28%AUG 14 96.04%AUG 15 97.57%AUG 16 94.88%AUG 17 96.00%AUG 18 97.25%

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State Estimator Convergence Update

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State Estimator Convergence Update

Convergence Dips on the 11th and the 13th

– These Dips occurred in the morning hours during Ramp Up

– Historically, telemetry quality drops during the evening and is corrected during the morning hours

– ERCOT shift engineers will begin monitoring more closely during the evening hours and calling MPs to correct issues

– This is another preparation step as we near the 168-Hour test and other September activities

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24-Hour Full-System Market and Reliability Test Update

Stacy Bridges

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24-Hour Test Update

24- Hour Full-System Market and Reliability Test

• Timeline

– This week’s 24-Hour Full System Test will conclude at 12:00PM today

– Generation is currently switching back to Zonal which started at 11:00AM

– Hot Line Call will be made once all generation is switched back to Zonal control

– Preliminary results including CPS1 score will be shared at the end of the test

• Results will be shared on 8/30/2010 Monday Call with additional details provided on September 3, 2010 Friday call

– Any issues to be resolved will be updated on the Monday call

– GREDP results to be sent out the week of 8/30/2010

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General Full-System Market and Reliability Test Update

Stacy Bridges

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General Full System Market and Reliability Test Update

40 - Hour Full-System Market and Reliability Test

• Timeline

– 08/26/2010 08:00 AM – 10:00 AM Trouble Shooting Period

– 08/26/2010 10:00 AM – 11:00 AM Cutover to Nodal

– 08/26/2010 11:00 AM – 08/28/2010 01:00 AM – Nodal Control

– 08/28/2010 01:00 AM – 02:00 AM Cutback to Zonal

Additional Full System Tests Specified in the 168-Hour Handbook

• During the 168-Hour Test: 48-Hour Test

• Late September – 36-Hour Test

• Late October – 24-Hour Test

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Questions

Q&A

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Appendix