1. Heidi Pacini Staff Engineer Developing a Draft 2011 Study Program March 10, 2010 SWG Conference Call

2. 2 Four study requesters supplied clarifying comments Comments have been highlighted in the summary/clustering spreadsheet o Posted to the SWG meeting pagemeeting page o Requesters addressed pointed questions, clarified study case time frame, starting study case, and proposed clustering Clarifying Comments Received from Study Requesters

3. 3 Clusters identified: o Energy Storage o RPS Targets o Policy Issues o Input assumption sensitivities o Resource variations o Transmission expansions o Modeling issues Next Step – Develop a Draft Study Program

4. 4 2014 or 2015 Baseline RPS o LRS Base Case Replace new gas generation with geographically dispersed renewables Draft Program for Near Term Cases

5. 5 2022 Baseline RPS o LRS Base Case o SPSC Reference Case - IRPs, LRS data Lower RPS High DSM/DG Low Carbon Re-purpose transmission for utilization by renewable resources Increased grid utilization, including FACTS devices Prolonged Drought 12,000 GWh shift to NM Draft Program for 10-Year Cases

6. 6 2022 Baseline RPS, continued o SPSC Reference Case - IRPs, LRS data, cont. 12,000 GWh shift to AZ CAES/Gas in Utah Pumped Storage in Utah Pumped Storage in S. Oregon Remove all transmission Replace new gas generation with geographically dispersed renewables Adverse load forecast Low load forecast Draft Program for 10-Year Cases

7. 7 2022 Baseline RPS, continued o Least cost/best fit o Unbundled RECs o CA net short met with in-state resources Shift CA solar to desert SW and S. NV Shift CA resources to Northwest and NW NV o 45-50% Out-of-state CA renewables o Increased WY Wind 3,000 MW 6,000 MW 9,000 MW WY wind & 1,800 MW gas Draft Program for 10-Year Cases

8. 8 2022 Baseline RPS, continued o Increased MT Wind 800 MW 1,500 MW 2,300 MW 3,000 MW 6,000 MW 9,000 MW o Increased solar development Includes 3,000 MW solar in S. NV Draft Program for 10-Year Cases

9. 9 2022 Baseline RPS, continued o Lower solar development o Firming of NW wind resources using BC hydro 2022 33% RPS o Least cost/best fit o Includes 6,000 MW solar in S. NV o Includes 9,000 MW WY wind Draft Program for 10-Year Cases

10. 10 Sensitivity Cases: o Low/High Hydro o Low/High Gas Prices o Combination of sensitivities Run on which cases? Transmission Expansion o Model individual transmission projects on a variety of cases Draft Program for 10-Year Cases

11. 11 2032 Baseline RPS o SPSC Reference Case - IRPs, LRS data High DSM/DG Low Carbon Geographically Targeted High DSM/DG Breakthrough Technology Prolonged Drought 2032 33% WECC-wide RPS o Includes 12,000 MW WY wind & 2,400 MW gas o Least-cost, best-fit Draft Program for 20-Year Cases

12. 12 2032 50% WECC-side RPS o Least-cost, best-fit o Includes 10% DG, 5% CHP Draft Program for 20-Year Cases

13. 13 Create subhourly PROMOD model o Addressed by VGS Study; create feedback loop Develop study methodology that recognizes current system practices o To MWG Improve DC line model o To MWG and staff Draft Program for Modeling Issues

14. 14 Test dynamic hydro model o To MWG HMTF Update the SCG list of potential projects with CTPG high potential upgrades o To the SCG Determine variable generation integration needs o How can we get a handle on these? Draft Program for Modeling Issues

15. Heidi Pacini Staff Engineer Western Electricity Coordinating Council hpacini@wecc.biz (801) 819-7610 Questions?