1. Rocky Mountain Power Load Growth and Network Planning April 27, 2007 Mark Adams

2. First stop, Wyoming Industrial Load Growth

3. © 2000 PACIFICORP | PAGE 3 –New and Proposed Industrial Loads –Jonah Field / Upper Green River Basin  Load locations  Our latest network planning –Wamsutter / South Central Wyoming  Load locations  Our latest network planning –Entire State  Additional large load  Our latest network planning

4. © 2000 PACIFICORP | PAGE 4 Projected Load Increases Project Load Location Probability of Occurrence Projected MW Load Increase200720082009201020112012 1PinedaleHigh25.00.018.022.0 2PinedaleMedium15.00.0 15.0 3PinedaleHigh85.00.09.015.041.0 62.0 4PinedaleLow150.00.0 50.075.0100.0125.0 5PinedaleHigh4.01.04.0 6PinedaleHigh10.02.55.07.510.0 7JonahHigh80.00.080.0 8Shute CreekMedium30.00.014.030.0 9KemmererHigh42.021.0 42.0 10KemmererHigh7.01.07.0 11KemmererHigh9.00.09.0 12EvanstonHigh2.51.02.5 13Rock SpringsMedium90.00.0 21.034.047.0 14Rock SpringsHigh6.00.06.0 15Bittercreek (Monell)High25.09.016.023.025.0 16WamsutterHigh2.51.52.5 17RawlinsHigh65.00.0 20.039.045.052.0 18RawlinsLow130.00.0 30.0 19WamsutterHigh4.02.03.5 4.0 20RawlinsHigh12.04.08.012.0 21RawlinsMedium12.00.0 4.08.012.0 22Atlantic RimHigh60.00.0 15.020.024.029.0 23RawlinsHigh12.09.012.0 24HannaMedium15.00.0 7.015.0 25CodyHigh2.0 26CodyHigh4.00.01.02.03.04.0 27RivertonMedium2.00.02.0 28 N. E. of CasperMedium 23.00.011.023.0 29Claim Jumper/Salt CreekHigh86.011.016.024.032.037.048.0 30DouglasHigh3.00.83.0 Total 101366253419555621737

5. © 2000 PACIFICORP | PAGE 5 Wyoming Industrial Load Forecast - Megawatts A display of the 2006 Wyoming peak load for all customers (Base Load) with a 2% year on year load growth overlaid with the new industrial load growth.

6. © 2000 PACIFICORP | PAGE 6 Jonah Field 1 - 25 2 - 15 3 - 85 4 - 150 5-45-4 6 - 10 7 - 80 8 - 30 9 - 42 10 - 7 11 - 9 12 - 2.5 Total Load of 545.5 Megawatts Jonah is one of the largest gas fields in the U.S. with reserves of 2.5 trillion cubic feet of gas. The loads in this geographic area represent natural gas processing and transportation and CO2 capture and transportation customers.

7. © 2000 PACIFICORP | PAGE 7 Jonah Field Infrastructure 6 80 KEMMERER EVANSTON ROCK SPRINGS PINEDALE LA BARGE DANIEL EDEN BIG PINEY Atlantic City Naughton Opal Monument Blacks Fork Westvaco Palisades Firehole Mansface South Trona Rock Springs Chappel Shute Creek Blue Rim 7 3 4 2 5 1 9 8 10 Chimney Butte 75MVA Jonah Field Switchrack (future 100MVA sub) Paradise 75MVA Ross Switchrack Wind River Phase Shifter to Creston Switchrack 230kV 230kV & 69kV 230kV 69kV 230kV Today Planned Ultimate Build-out (at today’s known and queued future loads and generation)

8. © 2000 PACIFICORP | PAGE 8 Wamsutter / South Central Wyoming 13 - 90 14 - 6 15 - 25 16 - 2.5 17 - 65 18 - 130 19 - 4 20- 12 21 - 12 22 - 60 23 - 12 24 - 15 Total Load of 433.5 Megawatts The loads in this geographic area represent nature gas and oil processing, transportation, CO2 injection, and coal bed methane customers.

9. © 2000 PACIFICORP | PAGE 9 Wamsutter / South Central Wyoming Infrastructure Blue Rim 80 ROCK SPRINGS WAMSUTTER BAIROIL RAWLINS EDEN SUPERIOR SINCLAIR HANNA CENTENNIAL ELK MOUNTAIN Mustang Miners Platte Jim Bridger Bar-X Point of Rocks Firehole Mansface Palisades Rock Springs 12 15 13 16 17 18 19 20 To Two Elk 250MW Generation 230kV Latham 25MVA 230kV to Atlantic Rim Creston Switchrack to Wind River Switchrack 230kV Barrel Springs 75MVA Today Planned Ultimate Build-out (at today’s known and queued future loads and generation)

10. © 2000 PACIFICORP | PAGE 10 All Projects in Wyoming 27 - 2 25 - 2 26 - 4 29 - 86 30 - 3 28 - 23 5 2 1 13 3 6 9 8 7 10 11 12 14 16 15 17 18 19 20 23 2122 24 Balance of the additional new industrial load in Wyoming is 120 Megawatts, mostly oil and gas processing customers.

11. © 2000 PACIFICORP | PAGE 11 Infrastructure in Wyoming t Today Planned Ultimate Build-out (at today’s known and queued future loads and generation) The physical electrical network requirements change dramatically as customers change facility sites and load requirements and as new customers make requests. The view represents approximately $500 million in transmission and distribution infrastructure investment.

12. 2nd stop, Utah Industrial & Commercial Load Growth

13. © 2000 PACIFICORP | PAGE 13 Northern Utah 1.Northern Utah (less Salt Lake County) currently has 123 MW of proposed development. 1 2 3 4 5 67 8 910 11 12 14 13

14. © 2000 PACIFICORP | PAGE 14 Projected Load Increases Load Location Probability of Occurrence Customer Projected Load Increase MW200720082009201020112012 1Northern UtahMedium1.2 0.61.2 2Northern UtahHigh10.0 3Northern UtahHigh1.0 0.8 4Northern UtahHigh3.5 5Northern UtahLow4.0 6Northern UtahHigh13.0 7Northern UtahMedium0.9 8Northern UtahHigh30.0 0.015.030.0 9Northern UtahHigh2.5 1.22.0 10Northern UtahHigh7.5 5.0 7.5 11Northern UtahLow2.0 12Northern UtahHigh2.0 2.5 13Northern UtahHigh40.0 14Northern UtahHigh5.5 3.55.5

15. © 2000 PACIFICORP | PAGE 15 South-East Utah 1.South-Eastern Utah has load requests totaling 192 MW. These increases are expected in the next 1-5 years. 1 2 34 5 6 78 9 10

16. © 2000 PACIFICORP | PAGE 16 Projected Load Increases Load Location Probability of Occurrence Customer Projected Load Increase MW200720082009201020112012 1Southeastern UtahHigh1.2 2Southeastern UtahHigh120.0 8.029.062.072.090.0120.0 3Southeastern UtahMedium8.0 0.04.08.0 4Southeastern UtahMedium16.0 0.010.0 5Southeastern UtahLow5.0 2.05.0 6Southeastern UtahHigh2.5 7Southeastern UtahHigh1.0 8Southeastern UtahHigh2.0 2.5 9Southeastern UtahHigh6.0 3.05.06.0 10Southeastern UtahHigh30.0 10.020.030.0

17. © 2000 PACIFICORP | PAGE 17 South-West Utah South-West Utah has load requests totaling 35 MW. These increases are also expected in the next 1-5 years 1 2 34 5 6 7 8

18. © 2000 PACIFICORP | PAGE 18 Projected Load Increases Name Probability of Occurrence Customer Projected Load Increase MW200720082009201020112012 1Southwest UtahHigh3.5 0.03.5 2Southwest UtahHigh2.0 3Southwest UtahHigh5.0 2.55.0 4Southwest UtahMedium3.0 5Southwest UtahHigh4.8 6Southwest UtahHigh2.2 7Southwest UtahHigh4.0 0.04.0 8Southwest UtahMedium10.0

19. © 2000 PACIFICORP | PAGE 19 Salt Lake County 1 4 9 62 3 11 10 7 5 8 –Northern Salt Lake County has had requests totaling 60 MW.

20. © 2000 PACIFICORP | PAGE 20 Projected Load Increases Name Probability of Occurrence Customer Projected Load Increase MW200720082009201020112012 Northern Salt Lake CountyMedium1.5 0.8 1.5 Northern Salt Lake CountyHigh8.0 2.55.07.5 Northern Salt Lake CountyHigh8.0 0.08.0 Northern Salt Lake CountyLow8.5 Northern Salt Lake CountyMedium0.9 Northern Salt Lake CountyHigh2.0 Northern Salt Lake CountyHigh18.0 4.09.013.018.0 Northern Salt Lake CountyLow1.0 Northern Salt Lake CountyHigh5.0 0.0 5.0 Northern Salt Lake CountyHigh0.8 Northern Salt Lake CountyHigh5.0 2.55.0

21. © 2000 PACIFICORP | PAGE 21 South Salt Lake County 5 98 1 2 6 7 4 3 –Southern Salt Lake County has had requests totaling 33 MW.

22. © 2000 PACIFICORP | PAGE 22 Projected Load Increases Rocky Mountain Power - New Utah Loads Name Probability of Occurrence Customer Projected Load Increase MW200720082009201020112012 1Southern Salt Lake CountyHigh11.5 6.08.010.011.5 2Southern Salt Lake CountyHigh1.5 3Southern Salt Lake CountyHigh0.8 4Southern Salt Lake CountyHigh5.0 0.05.0 5Southern Salt Lake CountyMedium1.5 6Southern Salt Lake CountyLow2.0 1.52.0 7Southern Salt Lake CountyHigh10.0 8Southern Salt Lake CountyHigh0.5 9Southern Salt Lake CountyLow0.5

23. © 2000 PACIFICORP | PAGE 23 Utah Industrial Load Forecast, MW’s

24. © 2000 PACIFICORP | PAGE 24 –Last stop, Utah’s Wasatch Front –Residential and small commercial Load Growth

25. © 2000 PACIFICORP | PAGE 25 Wasatch Front 2006 Summer Peak – What Happened? YearDateDayTimeMWCDD * Annual Peak CDD Summer Total CDD 2001August 8Wednesday17:003,26821.022.51,142 2002July 15Monday17:003,47322.025.01,121 2003July 22Tuesday17:003,67221.526.51,255 2004July 14Wednesday17:003,55819.022.0907 2005July 21Thursday16:003,85321.024.01,042 2006July 17Monday17:004,05119.025.51,196 |---------------- Peak Day Statistics----------------------| * Cooling Degree Day (CDD) = Avg (T max + T min ) - 65 For example, a day with an average temperature of 80 °F will have a value of 15 CDD.

26. © 2000 PACIFICORP | PAGE 26

27. © 2000 PACIFICORP | PAGE 27 Wasatch Front Transformer Loading - 2008

28. © 2000 PACIFICORP | PAGE 28 Wasatch Front Post Peak Observations –Summary Points  The 2006 summer can be considered fairly normal for purposes of infrastructure planning.  Weather-normalized summer peaks are still growing at more than 4 per cent.  Weather sensitivity of peak demand increased to 60 MW/CDD (a net increase smaller than for past years).  Direct load control (Cool Keeper) reduced annual peak demand growth rate by 0.2%.

29. Questions?