1. Joe Mercer Operations Planning Engineer III Operation Planning Analysis PHAAUG Meeting Mar 12 th, 2015

2. 2 Peak OPA Tasks and Estimated Timeframes (red) Select RTNET Base Case 8:00A Review and Apply Innages/Outages 8:15A Review and Apply Load/Interchange Forecast 11:00A Review and Apply Path SOLs 1:00P Run STCA 1:00P Validate STCA Results 1:00-2:00P o Check for any posted entity study reports Entity Results Coordination 2:00-5:00P Compile OPA and present to RCSOs 5:00-6:00P Peak OPA Overview

3. 3 RTNET Basecase and OPA Study Date YesterdayToday Tomorrow State Estimator (RTNET) snapshot WECC peak load Projected WECC peak load …snapshot case updated with forecasted data …

4. 4 Using PI, determine appropriate timeframe Select RTNET Base Case

5. 5

6. 6 Select closest RTNET snapshot Select RTNET Base Case

7. 7 Base case topology Generation, load, and interchange profile Path SOL Bulk electric system SOL Contingency and RAS database RAS arming points RTNET Base Case Initial Conditions

8. 8 Update OPA With Forecasted Data YesterdayToday Tomorrow RTNET BasecaseOPA Study …Forecasted topology, load, interchange, and path SOL…

9. 9 “Innages” – All elements that need to be returned to service. Outages – All elements that need to be removed from service. o COS Equipment Mapping database available on peakrc.org. Apply Innages/Outages

10. 10 Customized COS Data view Date Filtered and Exported to Excel Apply Innages/Outages

11. 11 Outage Data Filtered to determine outages and innages. Text file export containing outage/innage data. Apply Innages/Outages

12. 12 Script driven application of outages. Process to verify COS mapping exists for outage description. Process to verify mapped topology changes were performed. COS Outages Auto-Application

13. 13 Phantom scheduled outages. “One at a time” outages. “Operation Restricted” outages. “Hot work hold” outages. Line section outages. Outages elements not in COS Common COS Pit-Falls

14. 14 Ideal: Forecasted Load + Forecasted Generation = Forecasted Interchange Currently: Forecasted Load + Basecase Initial Conditions Generation = Basecase Initial Conditions Interchange Load, Generation, Interchange Forecast

15. 15 Apply Load Forecast

16. 16 Apply Load Forecast

17. 17 Apply Interchange Forecast

18. 18 Day ahead unit commitment data not accurate enough to use for OPA. Unit “innage” does not indicate unit output. Unit derate does not indicate unit output. Generation Forecast Shortcomings

19. 19 Apply New/Retired Path SOLs Path Report Data from COS

20. 20 Before Running STCA: Review basecase SOL exceedances Review basecase path SOL exceedances Run STCA

21. 21 STCA Results

22. 22 Verify historical RC notes, limits, and contingency definition. Verify outage taken and/or scheduled accurately. Determine load/interchange impact on SOL exceedance. Review entities posted reports. Verify RAS or other protection schemes. Validate STCA Results

23. 23 Typically occurs mid-late afternoon Validate results o Entities posted results, Ratings, Prior RC notes, RAS status, etc. Peak usually emails or calls the entities o After hours follow up with Peak RC ROE, if needed. Validate coordinated mitigation plans Entity Results Coordination

24. 24 Compile OPA and present to RCSOs Using SharePoint, log highlights of the OPA. Post OPA report internally and externally. Brief the RC leads the OPA results.

25. 25 Contingency Definition Creating Contingency Definitions RAS Summary and Editor Peak RAS Project Contingencies and RAS

26. 26 Contingency Definitions

27. 27 Contingency Definitions

28. 28 Creating Contingency Definitions

29. 29 Creating Contingency Definitions

30. 30 Creating Contingency Definitions

31. 31 RAS Summary

32. 32 RAS Summary

33. 33 RAS Editor

34. 34 RAS in EMS (RTCA) Viewing the triggers

35. 35 RAS in EMS (RTCA) Viewing the actions

36. 36 Viewing the results o EMS Displays  Level 3 24 pt RAS in EMS (RTCA)

37. 37 Specific results o EMS Displays  Level 3 24 pt RAS in EMS (RTCA)

38. 38 Peak RAS Project 1 year ago 8% complete Now 96% 8169 ctgs, 736 ctgs enabled for RAS

39. Joe Mercer - Operation Planning Engineer III 360.713.9594 jmercer@peakrc.com Thank you for your time!