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					Puget Sound Energy
Columbia Grid Presentation
August 15, 2007
John Phillips
PSE Strategy

   Meet service obligations
   Follow best practices for reliable, cost
    efficient system
   Work collaboratively with stakeholders
   Consider all alternatives (single utility)




2
Areas of Concern

   Transmission capacity for Whatcom and
    Skagit Counties
   King County capacity
   Cross Cascade capacity
   Transmission capacity for Pierce and
    Thurston Counties




3
     Winter/Spring Power Flow




               Monroe – Echo Lake




    BPA’s 500 kV




4
    Summer/Fall Power Flow




                  Monroe – Echo Lake




                       BPA’s 500 kV




       Raver - Paul
5
Whatcom/Skagit Counties

   South of Sedro Cut Plane operational limits
       Can be limiting S-N and N-S with single 230kV
        line outages
   New service needs
       New resources being proposed in US and
        Canada
       Changing generation and industrial loads
   BPA and Snohomish in parallel


6
Identified Alternatives

   Sedro-Horse Ranch #2 230kV line
       Rebuild 30 miles of existing 115kV
       Utilizes existing ROW
       Adds third 230kV line across South of Sedro
        Cutplane




7
                                 To BPA Custer       To BPA Custer

      PSE Sedro Woolley 230kV




                                                 New Sedro Woolley-HR #2
      Skagit County                                    230kV line

    Snohomish County




                                                           BPA Murray 230 kv
                                PSE Horsranch
                                   230kV




     SCL Bothell 230kV

                         BPA Snohomish 230kV                         BPA Monroe 230kV




                                                                            BPA Monroe 500kV


8
King County

   Monroe-Echo Lake Cutplane
       BPA internal cutplane
       Operational limitations
       Highest PSE load density
   North of Covington
       Operational limitations
       Growing load service needs
   BPA, SCL, and Snohomish in parallel


9
Monroe-Echo Lake Alternative

    Sammamish-Lakeside-Talbot 230kV line
        Rebuild 16 miles of existing 115kV
        Utilize existing ROW
        Adds fourth 230kV line across Monroe-Echo
         Lake
        Provide load service to North King County




10
                                                   230 kV

                                                        Sammamish
                           576
                                                  115 kV

                           78    455




     Present SAM-LAK-TAL
          115 kV Line




                                       252        306
                                                                115 kV
                                       307        276




                                                               Lakeside

                                              230 kV
                                             Ring Bus




                                                               Existing
                                                               To be removed or relocated as part of the
                                                               Lakeside 230 kV Transformation project.
                                                               To be constructed as part of the
                                                               Lakeside 230 kV Transformation project.



                           658   657

                                                115 kV

                                                         Talbot Hill
                                                230 kV




11
North of Covington

    Covington-Berrydale 230kV project
     scheduled for 2008
    Relieves operational limits north of
     Covington
    Provides loop feed to PSE loads at
     Berrydale and Talbot




12
                                          Covington – Berrydale Add 230 kV Line


                                                              TALBOT                       BPA
                                                               230 KV                  MAPLE VALLEY
                                                                                                 230 KV
                                         SCL

                                                                                          N.O.
                                                                                                                                 500 KV

                                               Talbot North
                                      To
                                    115 kV
                                     grid
                                                                                          N.O.
                                                                     N.O.
                                               Talbot South
                                      To
                                    115 kV
                                     grid                                                    N.O.
              O’BRIEN
                                                                                                                                345 KV


       To
                                                                                   Existing double
     115 kV                                      Bundle 4 spans                                                       Extend double
                                                                                   circuit Lapwing
      grid                                        1590 Lapwing                                                        circuit Lapwing




                                                                    To
                                                                  115 kV
                                                                   grid
                                                                                                                      BERRYDALE




         TO TACOMA


                                                                                                      New double
                                                                                                     circuit Falcon




                         West                                               East
                230 KV   Bus                                                Bus
                                                                                      BPA COVINGTON


                                                                                                         Existing
                                                                                                         Proposed for this project
                                                                                                         Future




                                500 KV                        500 KV
13
Cross-Cascades

    New PSE owned wind generation in
     Eastern Washington
    More eastern renewables expected as part
     of state initiative
    Growing Puget Sound Load
    Usage change in Westside resources to
     firm renewables
    BPA in parallel and preliminary studies are
     underway

14
Identified PSE Alternative

    Conversion of I.P. 115kV line to 230kV
        Adds new 230kV line across Cascades
        Directly connects to wind resources
        Improves load service to Kittitas County
        Mostly on existing R.O.W.




15
                                                     IP Cut-Over to 230 kV
                                                                                                               Dashed are future facilities
          Sammamish
                                                                       Cascade
                                                                                                                                 To Rocky
                                                                       34.5 kV
                                                                                                                                    Reach
      Lake                                                                       230 kV
    Tradition            Twin Falls
115 kV
                                                                                                                    Wild Horse


                230 kV                           IP 230 kV Line
                          230 kV                                                                                           Wind Ridge
                                                                                                                                 45 MVAr
         Maple Valley                 Rockdale
                                       12.5 kV                                                                         230 kV    Wanapum
                                                   Hyak     Easton    Cle Elum            Woldale   Kittitas
White River                  Baldi
                                                  12.5 kV   12.5 kV    34.5 kV            34.5 kV   12.5 kV




     16
Pierce and Thurston Counties

    New load growth pushing 230/115kV
     transformation capacity
    Raver-Paul cutplane impacts
    BPA and Tacoma Power in parallel




17
Pierce County Alternative

    Add 230/115kV transformer at Alderton
     Substation
    230kV source from White River or BPA
        Interconnection studies initiated with BPA
    Provides load service to south King &
     Pierce Counties
    Relieves Raver-Paul 115kV constraints
     north of Alderton



18
                                                                                                            White River                      BPA Covington   Raver
                                                                                                          115 kV      230 kV                      230 kV      500 kV



                                                             Existing
                                                             Proposed for this project
                                                             Future
                                                                                         Starwood
                                                                                                                                                                   230 kV



                                                                                                          115 kV               V                                   Baldi
                                  Gravelly                                                                                0k         55 kV
                                                                                                                     23
     To West                       Lake        115 kV
     Olympia      55 kV

                                                                                                                                                115 kV

                                                                                                                                                Krain
                                                                                                                                               Corner
     To Olympia
                              115 kV
                             St Clair
                                                            Tacoma N.                       115 kV                 Alderton
                                                               230 kV
                                          Raver
                                          South
                                                                        230 kV
                                        Interface
                                                         Tacoma S.                                                                                              To BPA
                                                                                                                                                             Grand Coulee
                                                                                                 115 kV
                                                                                             Frederick
                                                                                                                                                                       287 kV
           To BPA
           Olympia


                                                                                                                                   115 kV




                                                                                                                                   Electron
               Blumaer                                                                                                             Heights
                                                     V




                             BPA
                                                    0k




         115 kV
                                                50




                             Paul
                                                     V




                   Tono
                                                0k
                                                23




                    115 kV

                              500 kV
                                              To Chehalis




19
Thurston County Alternative

    Add 230/115kV transformer at Saint Clair
     or Spurgeon Creek (pending site adequacy
     review)
    230kV source from BPA
        Interconnection studies being initiated with
         BPA
    Provides load service to south Thurston
     County
    Relieves BPA Olympia and Tono loading


20
                                               Pleasant
                 West                           Glade
                Olympia     Plum
                                                                                                               Gravelly
                            Street
       115 kV                                                                                                   Lake


                                                                                                                                           To Frederickson




                                                                         115 kV              115 kV
         Olympia

       115 kV                                                                                St Clair


                                                                                              230 kV

                                                                                                                                                          To Tacoma S.
                                                                                                                                               230 kV

                                                                                                                                               230 kV
                                                                                                                                                          To Tacoma N.

                                     Airport                                                                                                              To BPA
                                                                                                                                              287 kV      Grand Coulee
                                                                                                                                              500 kV
                                                                                                                                                          To Raver

                   287 kV
                                                                                                                     115 kV
                                                                                                                                               To Electron Heights
                 500 kV
                                                              Blumaer
      BPA
     Olympia                                                115 kV




                                                                                                           V
                                                                                                       0k
                                                                                                      50
                                                                                                                              Existing
                                                                        BPA


                                                                                                       V
                                                BPA


                                                                                                      0k
                                                                                                                              Proposed for this project
                                                                        Paul
                                                                                                  23
                                                Tono
                                               115 kV
                                                          Tono

                                                          115 kV



                                                                        500 kV
                                                                                  Chehalis



21
Additional 115kV Projects
    Reconductor Bellingham-Sedro Woolley
     115kV lines
        Ties between Whatcom and Skagit Counties
        4/0 CU to 1272 Bittern
    Novelty 230/115kV transformer
        Load service to north King County
    Woodland-St Clair 115kV project
        Adds 3rd 115kV line between Pierce and
         Thurston Counties. (contingent on Timing of
         230 kV projects)



22
                                   Northern Intertie: S-N All lines In Service – 35F
                                   Constraints: Whatcom/Skagit & South of Sedro

                                                                Sensitivity of South-North Ingledow-Custer limits to
                                                                          PSE, SCL, and SNOH Generation


                           4000



                           3500



                           3000



                           2500



                           2000
     Ingledow-Custer limit (MW)




                           1500



                           1000



                                  500            S-N Westside Limit=2000 MW
                                                 SCL+SNOH Gen= 140 MW
                                                 SCL+SNOH Gen= 460 MW
                                   0            SCL+SNOH Gen= 775 MW
                                        0     100   200   300    400                   500   600   700       800   900   1000   1100   1200

                                                                                       PSE Generation (MW)




23
                                     Northern Intertie: S-N Echo Lake - Maple Valley Out of Service – 35F
                                     Constraints: North of Covington

                                                               Sensitivity of South-North Ingledow-Custer limits to
                                                                         PSE, SCL, and SNOH Generation

                                                 S-N Westside Limit=2000 MW
                                                 SCL+SNOH Gen= 140 MW
                                  3900
                                                 SCL+SNOH Gen= 460 MW
                                  3400           SCL+SNOH Gen= 775 MW


                                  2900

                                  2400

                                  1900

                                  1400

                                  900
     Ingledow-Custer limit (MW)




                                  400

                                  -100

                                  -600

                           -1100

                           -1600

                           -2100

                           -2600
                                         0    100      200      300     400       500     600      700      800   900   1000   1100   1200

                                                                                  PSE Generation (MW)




24
                                  Northern Intertie: N-S All lines In Service – 85F
                                  Constraints: Whatcom/Skagit and South of Sedro

                                                              Sensitivity of North-South Ingledow-Custer limits to
                                                                        PSE, SCL, and SNOH Generation


                           4000



                           3500



                           3000



                           2500



                           2000
     Ingledow-Custer limit (MW)




                           1500



                           1000



                                  500           N-S Westside Limit=2850 MW
                                                SCL+SNOH Gen= 140 MW
                                                SCL+SNOH Gen= 460 MW
                                    0           SCL+SNOH Gen= 775 MW
                                        0      100      200      300      400         500   600    700      800   900   1000   1100   1200

                                                                                      PSE Generation (MW)




25
     Northern Intertie: 7/25-8/08 N-S 1-500kV and 3-230kV lines Out of Service – 85F
     Constraints: Primarily Monroe-Echo Lake


                                                           Sensitivity of North-South Ingledow-Custer limits to
                                                                     PSE, SCL, and SNOH Generation


                             4000


                             3500


                             3000


                             2500


                             2000
       Ingledow-Custer limit (MW)




                             1500


                             1000


                                    500


                                                N-S Westside Limit=2850 MW
                                      0
                                                SCL+SNOH Gen= 140 MW
                                                SCL+SNOH Gen= 460 MW
                                    -500        SCL+SNOH Gen= 775 MW
                                           0   100   200     300    400      500   600    700      800   900   1000   1100   1200

                                                                             PSE Generation (MW)




26

				
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