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Nodal Day-Ahead Market Update Special NATF Meeting July 19, 2010

Nodal Day-Ahead Market Update Special NATF Meeting July 19, 2010. Agenda. Outline of Discussion Day-Ahead Market Design/Processes/Procedures Key DAM Integration (model, contingencies, LDFs) DAM configuration (shift factor cutoff, use of shadow price caps)

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Nodal Day-Ahead Market Update Special NATF Meeting July 19, 2010

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  1. Nodal Day-Ahead Market UpdateSpecial NATF Meeting July 19, 2010 1 Texas Nodal

  2. Agenda • Outline of Discussion • Day-Ahead Market Design/Processes/Procedures • Key DAM Integration (model, contingencies, LDFs) • DAM configuration (shift factor cutoff, use of shadow price caps) • Software and Data issues and impacts • Other deliveries (Redacted Model, NPRR206 eFactor values) • DAM Analysis • Analysis of July 15, 2010 DAM • Some case analysis for previous DAM 2 Texas Nodal

  3. Meeting Objective • Objective of Workshop today • Focus on quality of solution: • Shared understanding of design, process, integration • Feedback from market on observed issues (software and data) • How to improve/leverage market trial activities and scenarios • Out of scope for workshop • Debates on implemented design • Significant changes in reporting of results 3 Texas Nodal

  4. DAM Design/Process/Procedures • DAM Design/Processes/Procedures • Section 4 Nodal Protocols Day Ahead Operations • http://nodal.ercot.com/protocols/index.html • MMS Business Requirements and Conceptual System Design • http://nodal.ercot.com/docs/pd/mms/index.html#req • http://nodal.ercot.com/docs/pd/mms/index.html#des • DAM Operating Procedures • http://nodal.ercot.com/readiness/markettrials/dam/index.html 4 Texas Nodal

  5. DAM Design/Process/Procedures • DAM Procedure Summary • 0600 DAM Operator validates posting • 0700 Phase 2/Credit Validation • 1000 DAM submissions closed • DAM sub-process summary: (next slide) 5 Texas Nodal

  6. I. Day-ahead market – clearing process Day-Ahead Execute DAM Execute DRUC Midnight 0600 1000 1430 1800 Execute CRR Simultaneous Feasibility Test Calculate and Post AS Obligation • Calculate and assign AS Plan quantity to each QSE based on Load Ratio Share. • Evaluate all CRRs using the Day-Ahead hourly Network Model. Execute Ancillary Service Insufficiency Check • Validate inputs from QSEs including Offers, Bids, Trades, Schedules (Self-Schedules and DC Tie Schedules), and Self-arranged AS. Validate Inputs from QSEs • Determine, prior to clearing the DAM, if there are sufficient AS offers to meet the AS requirements. Execute PTP Options Derating • Derate CRR Options declared for Real-Time settlement for the purpose for DAM clearing. • Determine Unit Commitments, Energy, AS and CRR awards by optimizing the system-wide economical benefits given bids and offers. Execute DAM Clearing Engine • Post-process the outputs of DAM Clearing Engine, and • Publish and communicate the DAM results to Settlement and MIS. Communicate DAM Results

  7. Key DAM Integration 7 Texas Nodal

  8. Other Observations and Analysis • High-Level Inputs most frequently inquired about by market • Network Operations Model • Loaded weekly from NMMS into MMS for DAM,RUC,SCED • Connectivity, Ratings, Thermal Constraints, Contingencies • Outages • Transmission outages from OS at 0600 Day-Ahead • SPS/RAP • SPS/RAP definition from NMMS/CIM model • Shift Factors calculated in DAM process (different from SCED) • Dynamic Ratings • From EMS at 0600 Day-Ahead • Load Distribution Factors (Zone, Hub) • EMS – Normally, the State Estimate output of 7 days ago. Holidays will be different • QSE COP • Current day COP used for temporal constraints of next day • COP HSL/LSL used for capacity available next day 8 Texas Nodal

  9. DAM Configurations • DAM Configuration questions • Shift Factor Cutoff • Set to 0.001 for Resource Node • No cutoff for Load Zone & HUBs • DAM Penalty Factors • Not used in pricing, only for setting priority • Ancillary Services • RegUp = 3,000,000 $/MW • RegDn = 3,000,000 $/MW • RRS = 2,000,000 $/MW • NSPSIN = 1,000,000 $/MW • Transmission constraints: 350,000 – 1,000,000 $/MW 9 Texas Nodal

  10. DAM Software and Data issues • DAM Software and Data issues in progress • Link to current DAM trials issues list: • http://nodal.ercot.com/readiness/markettrials/dam/index.html • MMS5-P8 delivering last week of July • Performance limitations • Energy Only offer/Bids limit: 15,000 / PTP bids: 15,000 /CRR option offers: 2,000 • Full volume can result in long-running DAM (not observed in trials) • Data highlights: • Updated contingency definitions coming Aug 2 • EMS still tuning LDF • Workaround for Generic (Non-thermal) constraints • Ratings 10 Texas Nodal

  11. Other DAM deliveries • Other functionality delivering to market trials to enhance DAM • NPRR206- Credit eFactors (MMS5-P8) • NPRR102- Redacted Network Model (target July 23) 11 Texas Nodal

  12. DAM Analysis 12 Texas Nodal

  13. Contents • Analysis of July 15th DAM • Summary of OD 7/15 • Unconstrained study • MCPC for Ancillary Services • Negative MCPE analysis • Some issues from other days’ DAM • LZ energy clearing constrained • Opportunity cost in MCPC • Constraints binding in DAM which supposed to be protected by SPS • CRR-NOIE Offers (options in DAM) 13 Texas Nodal

  14. DAM Submissions for OD 7/15 14 Texas Nodal

  15. Analysis of July 15th DAM • Overall System Offers/Bids & Clearance 15 Texas Nodal

  16. Analysis of July 15th DAM • Load Zones Bids & Clearance 16 Texas Nodal

  17. Price Difference Between Load Zone and Hub $/MWh 17 Texas Nodal

  18. Unconstrained Energy Clearing VS Constrained Energy Clearing 18 Texas Nodal

  19. Analysis of July 15th DAM • 17 Secured Equipments is bounded. • 20 Contingencies have associated Binding Constraints. 19 Texas Nodal

  20. Ancillary Service Study 20 Texas Nodal

  21. REGUP Price Spike Study RegUp information for Hour 1, 2 and 24 RegUp Offer structure for Hour 1 21 Texas Nodal

  22. SPP Deviation 22 Texas Nodal

  23. Settlement Point SWEC_G1 Price Study The offers/bids at settlement point SWEC_G1 has large influence on a binding constraint from STASW to NDLNE. There is a negative price offer (-37.5 $/MWh) at the SP all the day with different quantities for each hour. At hour 9, the quantity is the biggest one and it became the marginal unit to set the SPP. 23 Texas Nodal

  24. Load Zone clearing constrained • Currently, DAM enforce all transmission line and transformer constraints for all voltage level modeled by ERCOT system • For some constraints, especially lower KV, only reducing load behind the constraints can solve the congestion • DAM cannot control the individual load. Instead, DAM have to limit the total cleared energy only bids & PTP sink to limit the load amount behind the congested line • OD 7/9 DAM Note: actually clearing includes the net of Energy Only Offer/Bids, PTP obl and CRR for real time. 24 Texas Nodal

  25. Opportunity Cost in MCPC • OD 4/28 DAM – Hour 900 RegDn MCPC = 1021.74 $/MWh • The marginal resource which was provide the last MW of Reg Down. In DAM solution, this resource has already been awarded the whole capacity up to HSL (3PO + RegUp + RRS =150 MW) and RegDn = 3PO – LSL =75.92 MW • If system need 1 more MW of Reg Down, this resource shall increase 1 MW energy and reduce 1 MW either RegUp or RRS. Reduced 1 MW RegUp/RRS will be provided by marginal offers of RegUp/RRS which is at 1001.01 $/MWh based on MCPC for RegUp/RRS. Increased 1 MW energy will require other resources to reduce total 1 MW and the cost change will be the LMP at resource node. Therefore, • RegDn MCPC = (RegUPMCPC  - RegUPOffer) + (EngOffer - LMP) + RegDNOffer 25 Texas Nodal

  26. Binding Constraints protected by SPS • OD 6/10 DAM • Associated SPS is defined (the Austrop 345/138 kV Auto overloading for the contingency loss of the other Austrop 345/138 kV Auto) • Defect: associated constrain was created earlier than the SPS be triggered. • OD 5/26 – 5/28 DAM • Elkton – Athens 138 kV line overloading for the contingency loss of Trinidad – Stryker Creek & Trinidad – Mt. Enterprise 345 kV double circuit • Associated SPS is defined. However, • Triggered Flow > Dynamic Rating 26 Texas Nodal

  27. Binding Constraints protected by SPS 27 Texas Nodal

  28. CRR Option declared to be settled in RT • CRR option offers from NOIE to DAM • Only submitted CRR offers will be included in DAM and possibly to be settled by RT • Not submitted CRR option will be settled by DAM LMP as all other CRR • DAM derating testing (POD) for CRR option offers • Before DAM run, CRR offers will be checked against Day-Ahead net work. • The offered quantity will be reduced if the total offer is over network capability. • Only the remaining part of CRR offers will be used by DAM • The derated part will be settled by either DAM or RT based on the LMP and offered price (protocol section 4.6) …(next page) 28 Texas Nodal

  29. CRR Option declared to be settled in RT • DAM will reserve the transmission capacity for non-cleared CRR offers • To a constraint the impact will be, (OfferedMW – ClearedMW ) * max[0, (SourceSF - SinkSF) ] • The clearing price of a CRR offer will be, ∑ max[0, (SourceSF cons i – SinkSF cons i) ] * ShadowPrice cons i • The CRR offer clearing price >= LMP difference between source and sink • The LMP difference will be, LMP sink – LMP source = (λ -∑SinkSF cons I *ShadowPrice cons i) – (λ - ∑SourceSF cons i * ShadowPrice cons i) =∑ (SourceSF cons i – SinkSF cons i) * ShadowPrice cons i 29 Texas Nodal

  30. Q&A Entended Q&A 30 Texas Nodal

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