1. CRR Model Building Process Bradley Bell CRR Engineer

2. Intro: Model Building Process Model Building Environment Model Building Timetable Building Contingency File Outages / Outage Selection Process Running Topology Processor Post Processing Model

3. Overview NMMS Database Topology Processor Transmission Outages CRR Model

4. Model Building Environment CRR Model Building Server ◦ - IMM ◦ - TP Snapshot of NMMS model One instance of NMMS model

5. Timeline (Monthly Model) PROCESSHOURS Build Contingency File16 hours Outage Selection3-8 hours Run Topology Processor24 hours Post Process Model16 hours Model building process will start 6-8 business days before model posting date on CRR calendar.

6. Outage Pull Date Monthly AuctionOutage Pull Date Dec 201010/ 6 /2010 Jan 201111/16/2010 Feb 201112/14/2010 Mar 20111/25/2011 Apr 20112/19/2011 May 20113/11/2011 Jun 20113/30/2011 Jul 20115/27/2011

7. Timeline (Annual Auction) 1 st ModelHOURS Build Contingency File16 hours Outage Selection3-8 hours Run Topology Processor24 hours Post Process Model16 hours 2 nd – N th ModelHOURS Build Contingency File16 hours Outage Selection 0 hours Run Topology Processor 3 hours Post Process Model16 hours

8. Create Contingency File NMMS Model CIM Model Contingency Building Program CIM Model Including Contingencies Create NOMCR containing CIM Model w/contingencies

9. OUTAGES

10. Outage Query WHERE outage.CATEGORY = 'Transmission‘ AND outage.planned_end_date >= (ADD_MONTHS (TRUNC (LAST_DAY (SYSDATE) + 1), 1)) -- this gives you the current month plus 2 AND outage.planned_start_date <= (ADD_MONTHS (TRUNC (LAST_DAY (SYSDATE) + 1), 2))-- this gives you the current month plus 3 AND outage.status IN ('Apprv', 'Accpt') OR ( outage.status = 'Withd’) AND outage.planned_end_date >= (ADD_MONTHS (TRUNC (LAST_DAY (SYSDATE) + 1), 1)) -- this gives you the current month plus 2 AND outage.planned_start_date <= (ADD_MONTHS (TRUNC (LAST_DAY (SYSDATE) + 1), 2)) -- this gives you the current month plus 3 AND outage.actual_start_date IS NOT NULL AND outage.actual_end_date IS NULL AND outage.CATEGORY = 'Transmission');

11. Outages / Outage Selection Process Nodal Operating Guides 5.5(6): System Modeling Information (6) Congestion Revenue Right (CRR) Network Model Outage determination uses network topology of the CRR Network Model identified by ERCOT. This must include Planned Outages of Transmission Elements approved by ERCOT at the time the CRR Network Model is being built and that demonstrate significant impact to the transfer capability during the effective period. ERCOT will consider including Outages in the CRR Network Model that are scheduled to occur in the relevant time period and meet one or more of the following criteria: (a)Consecutive or continuous approved Outages greater than or equal to five days; (b)Approved Outages which include Transmission Elements included in the definition of a Hub; (c)Approved Outages which include Transmission Elements in a 345 kV Transmission Facility; (d)Approved Outages that require the use of a Block Load Transfer (BLT); and (e)Any other approved Outage that has been determined by ERCOT to carry a substantial risk of causing significant congestion.

12. Gantt Chart

14. Outage Dates Nov. 6 outagesNov 12. outages Line A 138kV Line B 138kVLine X 138kV Line C 345kVLine Y 345kV Line D 69kVLine Z 69kV

15. Outage Date Selection Market Operator (MO) uses the base case flows in the On-Peak SSWG case for the appropriate year and season to qualitatively estimate the severity of the outaged lines. MO chooses the worst day of the month based on the evaluation from the step above as well as special consideration given to (in descending order) outages involving: ◦ Lines in the W->N constraint ◦ Lines in the N->H constraint ◦ Lines involved in other 2010 CSCs/CREs MO imports the outages into TP the and builds the network model based on those outages.

16. Topology Processor Create a basecase model and a model with outages Insert dynamic ratings for each weather zone from 10 year historical average Create RAW file and CRR output files

17. Post Process Model Manually Create ◦ Flowgate rights list and definition ◦ Contingency list and definition ◦ Non-Thermal Constraints list and definition ◦ Monitored Lines and Transformers ◦ CRR to Operations name mapping document ◦ Model Comparisons

18. QUESTIONS?