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Market Trials Update

Market Trials Update. Agenda. LFC Testing Review Review of materials presented at TAC Changes in Market Trials schedule and activities 168-Hour Handbook Review (presentation in the afternoon). LFC Update and Review of Materials Presented at TAC.

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Market Trials Update

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  1. Market Trials Update 1 Texas Nodal

  2. Agenda • LFC Testing Review • Review of materials presented at TAC • Changes in Market Trials schedule and activities • 168-Hour Handbook Review (presentation in the afternoon) 2 Texas Nodal

  3. LFC Update and Review of Materials Presented at TAC 3 Texas Nodal

  4. Issues & Observations During the 8 Hour Test on June 17th 4 Texas Nodal

  5. Issues During the 8 Hour Test - ERCOT • Issue #1 – Missing Shift Factors for Electrical Busses affected SPP calculation • EMS integration did not properly provide electrical bus shift factors • Load Zone, Hub, and Electrical Bus LMPs/SPPs incorrect when constraints binding or violated • Issue introduced with EMS Bug Fix end of last year • Issue #2 – Missing Shift Factors for constraints in SCED for brief period • Shift Factor transfer from EMS to MMS from1320-1339 had issues • Constraints were ignored by SCED for 19 minutes • Dispatch closely monitored by Operators until resolved • Issue introduced with EMS Bug fix in mid-May • Issue #3 – Incorrect flag setting in EMS • ERCOT did not use load distributed bus as the reference bus • Telemetry changes created topology changes which lead to a bus in the west zone to be the reference bus • Having 3% shift factor cut off caused several WGRs to have no shift factors on the constraint causing WGRs to be marginal 5 Texas Nodal

  6. Issues During the 8 Hour Test – Market Participants • Issues during test for Market Participants • Telemetry: • Inconsistencies between JOU owners (e.g., telemetry, COP) • Incorrect Ancillary Service values in telemetry for Resource • Incorrect Resource Status Codes • Incorrect HSL/LSL values telemetered • Resource with nodal Output Schedule offering BES into zonal market • Resources not following their nodal Base Points • Resources not following regulation signals • Zonal Resource Plans not in agreement with Nodal 6 Texas Nodal

  7. Next Steps – LFC Tests • Migrate fix to views that will resolve the issue with the Shift Factors not being available (Code migrated, still monitoring) • Migrate fix to views that will resolve the issue with transferring an incomplete Shift Factor set (Code migrated, still monitoring) • Use Distributed Load Bus as the Reference Bus instead of Single Reference Bus • Set Shift Factor cut-off to a much smaller value such as .0001 • More closely monitor Resources in how they are following their Base Points and provide feedback • Confirm parameter settings prior to every test • Leave OC1 in Zonal during transition. Once 100% Nodal, take out OC1 in Zonal. Bring the OC1 back at the start of transitioning back to Zonal • Specific time slots for tuning for both Market Participants and ERCOT 7 Texas Nodal

  8. Changes in Market Trials Activities 8 Texas Nodal

  9. Changes in Market Trials Activities • Issues encountered during the 8-Hour LFC test demonstrated the need to shift the focus of Market Trials Activities • The following changes are to achieve the following: • Reduce the number of DAMs to create more resource availability to support additional LFC tests • Increase the number of LFC tests in order to gradually step into a multi-day scenario • DAM will focus on the quality of the data submitted (deconstructed offer curves, more complete coverage of online generation with offer curves, accurate COPs) • Provide more flexibility to address issues and refine Market Trials activities as needed 9 Texas Nodal

  10. Changes in Market Trials Activities • Additional LFC testing will be added • Week of 7/19 – 5-Hour Test • Week of 8/02 – 24-Hour Test • August will include 1 – 2 additional tests • September will include 1 – 3 additional tests • Additional tests will be confirmed no later than 2 weeks prior to the testing date • Day Ahead Market (DAM) and Reliability Unit Commitment (RUC) • Will be run for LFC Operational Dates during the weeks of LFC testing • A focused input day will be included where MPs will submit trades, bids, offers and COPs that more representative of the post go-live market • On non-LFC testing weeks: • DAM and RUC will continue to run up to 5 times weekly 10 Texas Nodal

  11. Changes in Market Trials Activities • August will remain our target for running any operational scenarios that have been added or need to be re-run • Examples of scenarios that are being reviewed for inclusion are: • Emergency Base Point (SCED Failure) SASM for Undeliverable AS / Failure to provide AS • Manual Offset for SCED SASM for ERCOT Load Increase, • DCS Event HRUC / DRUC Failure and Timeline Deviation • EEA Event Capacity Shortage Intra-day and Real Time • DC Tie at max import trips Frequency excursion high • Settlements and Credit will continue to run daily and produce normal outputs taking into account the revised Market Trials activities (e.g. no DAM settlements on non-DAM dates) • CRR and Outage Scheduling activities remain unchanged and will align with the communicated go-live transition plans (note that ERCOT will consolidate these transition plans into a Cutover Handbook to be published and reviewed at the Market Readiness Seminar (MRS) #5 on 7/28/2010) 11 Texas Nodal

  12. 168-Hour Handbook Review(word document) 12 Texas Nodal

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