WESTERN ELECTRICITY COORDINATING COUNCIL

[ASSOCIATED MATERIAL]{.underline}

[FOR]{.underline}

[2008 LSP1-SA BASE CASE]{.underline}

March 12, 2003

> [ASSOCIATED MATERIAL]{.underline}
>
> [2008 LSP1-SA BASE CASE]{.underline}
>
> [INDEX]{.underline}
>
> [Page]{.underline}
>
> I. Summary of Significant System Changes 1
>
> II\. Interchange Diagram 12
>
> III\. Supplemental Line Flow Summary 13
>
> IV\. Phase Shifting Transformer Representation 18
>
> V. Power Flow Case Analysis 21
>
> A. Area Reserve Factor
>
> VI\. Information by Area 23
>
> A. Interchange Schedules
>
> B. Loads and Resources
>
> C. Generation Schedules
>
> VII\. Power System Stabilizers In-Service Tabulation 107

[SUMMARY OF SIGNIFICANT SYSTEM CHANGES]{.underline}

[TO THE 2002 LSP2 OPERATING CASE]{.underline}

[TO COMPILE THE 2008 LSP1-S BASE CASE]{.underline}

A. [AREA COORDINATOR: DESERT SOUTHWEST]{.underline}

> \- Added Saguaro-Tortolita #2 500 kV line.

-   Added Tortolita 500/138 kV #2 transformer.

-   Added Gila River (2856 MVA), Red Hawk (2672 MVA), Harquahala (1224
    MVA), Mesquite (1628 MVA), and Arlington (841 MVA) generation
    projects in southern Arizona.

> \- Centennial Project in southern Nevada is represented and includes
> the following:
>
> Crystal North, Harry Allen, Duke, Mirant, Reliant and Calpine 500 kV
> substations.
>
> Harry Allen -- Duke, Mirant, Reliant and Crystal -- Calpine 500 kV
> lines to facilitate generation interconnection.
>
> Harry Allen -- Northwest 500 kV line and Northwest 500/230 kV
> transformer.
>
> Mead -- Harry Allen -- Crystal North 500 kV line.
>
> Two 500 kV phase shifters at Crystal.
>
> Bighorn 230 kV bus and Arden -- Bighorn 230 kV lines #1 and #2.

Duke units 1-6 (1682 MVA), Mirant units 1-3 (733 MVA), Reliant units 1-3

> (760 MVA), Calpine units 1-4 (1373 MVA), and Bighorn units 1-6 (1682
> MVA).

-   Added Blythe (612 MVA), Sundance (605 MVA), and Big Sandy (1112 MVA)
    generation projects in WAPA LC control area.

-   Greenway 230 kV bus added in Faulkner -- Mead South 230 kV line to
    service load at Greenway.

-   Estrella 500/230 KV substation renamed to Rudd.

B. [AREA COORDINATOR: CANADA]{.underline}

Significant changes for B.C. Hydro:

-   Added following generation: LB2 GEN (18 MVA), VIGP G1,2 (300 MVA),

> BRX G1 (225 MVA), RVG G1 (25 MVA), and PIN Ipp 1 and 2 (37 MVA),
>
> ALH G1, 2 (189 MVA), SEV G4 (225 MVA), and POW 132 (136 MVA).

-   Added 40 MVAR switched shunt capacitor at VNT138 (50654).

-   HVDC cable ARN230AC (50947) to VIT 230 (50360) is removed.

-   Generating plants PUR-IPP1 and PUR-IPP2 are combined and renamed to
    CRS-IPP.

> Significant changes for Aquila Network Canada:

-   Added the following 230 kV transmission lines:

WSS230 (52525) -- BTS230 (52502)

BTS230 (52502) -- KCL230 (50788)

BTS230 (52502) -- SEL230 (50783)

BTS230 (52502) -- ALH230 (51061)

WSS230 (52525) -- RGA230 (52211)

-   Added the following transformers:

BTS230 (52502) -- BRX63 (52477) 230/63 kV #1 & #2

WSS230 (52525) -- WSS63 (52224) 230/63 kV #1 & #2

KCL230 (50788) -- KCL63B (52661) 230/63 kV

RGA73L (52211) -- RGA63T1 (52231) 230/63 kV

LEE230C (52317) -- LEE138C (52302) 230/138 kV

\- Waneta -- Boundary 230 kV line is rerouted through Nelway 230 kV.

> Significant changes for Alberta:

-   No significant system changes.

C. [AREA COORDINATOR: IDAHO]{.underline}

> \- For load growth in the Boise area, added the Caldwell -- Garnet --
> Locust 230 kV line and a second Locust 230/138 kV tie bank.

\- Added a 230/138 kV tie bank at Garnet and the Garnet -- Hill 138 kV
line.

\- Reconductored the Ontario -- Caldwell 230 kV line.

-   Added phase two of the Brownlee -- Boise Bench 230 kV project with
    the addition of the Brownlee -- Oxbow #2 230 kV.

> \- Added Garnet (332 MVA) and Danskin (197 MVA) generation projects
> with associated transmission integration projects.

\- Added 30% series compensation at Midpoint in the Midpoint -- Kinport
345 kV line.

\- Added a 175 MVAR shunt bank on the Borah 345 kV bus.

> \- Replaced the two 345/230 kV transformer banks at Midpoint with two
> 700 MVA units.

D. [AREA COORDINATOR: MONTANA]{.underline}

\- No significant system changes.

E. [AREA COORDINATOR: NORTHWEST]{.underline}

> [Changes from the 2001 Significant Additions Report]{.underline}:

-   A new Big Hanaford combined-cycle generation project (248 MW) near
    Centralia, Washington is available but off-line. (TAU)

-   A new Condon wind generation project (24 MW) near Condon, Oregon is
    in service. (NWWnd)

-   The Four Mile Hill geothermal generation project (45 MW) near Glass
    Mtn, California is not yet in service. (CALP)

-   New generation plants 3 & 4 at Fredonia, Washington (100 MW total)
    are in service. (PSE)

-   A new GNA Cliff combined-cycle gas generation project (180 MW) near
    Goldendale, Washington is available but off-line. (GNAE)

-   A new Klondike Schoolhouse wind generation project (24 MW) near
    Condon, Oregon is in service. (NWWind)

-   A new Klamath Addition single-cycle gas generation project (100 MW)
    adjacent to the existing Klamath Falls combined-cycle plant is
    available but off-line. (KLA)

-   The Longview "Mint Farm" combined-cycle generation project (248 MW)
    near Longview, Washington is delayed. (MIR)

-   The Mercer Ranch combined-cycle generation project (740 MW) near
    Crow Butte, Washington has been cancelled. (COGNX)

-   The Newport (Wallula) combined-cycle generation project (1300 MW)
    near Wallula, Washington is delayed. (NEWP)

-   A new Nine Canyon wind generation project (50 MW) near Paterson,
    Washington is available but off-line. This replaces the 8 MW Energy
    NW Wind project. (EnNW)

-   The Starbucks combined-cycle gas generation project (1200 MW) near
    Little Goose dam, Washington is available but off-line. (NWPwr)

-   The Sumas II combined-cycle generation project (550 MW) near Sumas,
    Washington is not yet in service. (PSE)

-   The Umatilla combined-cycle generation project (500 MW) in Umatilla
    County, Oregon is not yet in service. (PSE)

-   The Albany -- Eugene 115 kV reinforcement project is delayed. (BPA)

-   The Beacon North -- Rathdrum 230 kV line is looped into a new Otis
    sub, where a new 230/115 kV transformer (300 MVA) is installed.
    (AVA)

-   The Benton -- Glade -- Franklin 115 kV line is reconductored to 205
    MVA. (BPA)

-   A long stretch of existing 69 kV line in the Olympic Peninsula,
    Washington area, running from Happy Valley to Port Angeles, is
    upgraded to 115 kV. (CLA)

-   The Chief Joseph -- Monroe 500 kV #2 line is delayed. (BPA)

-   The Echo Lake -- Monroe 500 kV #2 line (3460 MVA) is in service.
    (BPA)

-   In support of the Chehalis generation project, the Paul -- Allston
    #1 500 kV line is looped into a new 500 kV substation at Napavine.
    (BPA)

-   The Leavenworth -- Coles Corner 115 kV line is delayed. (CHPD)

-   In support of the Starbuck generation, the Little Goose -- Lower
    Monumental 500 kV line is looped into a new Starbuck substation and
    a new 500 kV line from Starbuck to Lower Monumental is added. (BPA)

-   The new Silverdale -- Foss Corner 115 kV line is delayed. (PSE)

-   The SnoKing -- Clearview 115 kV line upgrade is delayed. (SNPD)

-   The SnoKing tap on the Monroe -- Samammish 230 kV line, serving the
    SnoKing 230 kV bus, is removed and replaced with a SnoKing tap on
    the Echo Lake -- Monroe #1 500 kV line, along with a new 500/230 kV
    (1800 MVA) transformer. (BPA)

-   The existing Hanford -- John Day 500 kV and Hanford -- Ostrander 500
    kV lines are both looped into a new substation called Wautoma. From
    Wautoma, a new 500 kV line (3950 MVA) runs to Schultz substation.
    The new line replaces the Schultz -- Hanford 500 kV addition
    project. (BPA)

-   The 500/230 kV transformer at Satsop substation is relocated to
    Shelton substation. The existing Paul -- Satsop 500 kV line is
    split, with the Paul section being extended and reterminated at
    Shelton and the Satsop section being operated at 230 kV and extended
    and reterminated at Olympia. (BPA)

-   To support the Wallula generation project, the existing McNary --
    Sacajawea Tap 500 kV line is tapped at Smiths Harbor, and a new
    Smiths Harbor -- Wallula 500 kV line is added. (BPA)

-   A new Priest Rapids -- Wahluke - Frenchman -- Potholes 230 kV line
    is in service. A new 672 MVA phase-shifter is installed in the
    Wahluke -- Frenchman section. A new 230/115 kV, 250 MVA transformer
    is installed at Frenchman sub. (GCPD)

-   A second 500/230 kV transformer at Meridian, Oregon sub (650 MVA) is
    in service. (PACW)

-   A new 230/115 kV transformer at South Bremerton sub, Washington (325
    MVA) is in service. (PSE)

-   Series compensation (50%) has been added to the Bell -- Taft 500 kV
    line. (BPA)

-   Series compensation (50%) has been added to the Dworshak -- Taft 500
    kV line. (BPA)

-   Series compensation (42%) has been added to the Echo Lake - Kangley
    -- Schultz 500 kV line. (BPA)

-   Series compensation (45%) has been added to the Raver -- Schultz #1
    500 kV line. (BPA)

[Changes from the 2002 LSP2 Operating Case:]{.underline}

-   A new Big Hanaford combined-cycle generation project (248 MW) near
    Centralia, Washington is available but off-line. (TAU)

-   A new Condon wind generation project (24 MW) near Condon, Oregon is
    in service. (NWWnd)

-   The Chehalis combined-cycle generation project (600 MW) near
    Chehalis, Washington is available but off-line. (CPGLP)

-   The Everett Delta combined-cycle gas generation project (225 MW)
    near Everett, Washington is available but off-line. (FPLE)

-   PSE's temporary generation at Fredrickson 3 and 4 is removed. (PSE)

-   The Goldendale Aluminum (GEP) combined-cycle generation project (248
    MW) near Goldendale, Washington is available but off-line. (GOLD)

-   A new GNA Cliff combined-cycle gas generation project (180 MW) near
    Goldendale, Washington is available but off-line. (GNAE)

-   The Hermiston (HPP) combined-cycle gas generation project (600 MW)
    in Umatilla County, Oregon is available but off-line. (CALP)

-   A new Klamath Addition single-cycle gas generation project (100 MW)
    adjacent to the existing Klamath Falls combined-cycle plant is
    available but off-line. (KLA)

-   A new Klondike Schoolhouse wind generation project (24 MW) near
    Condon, Oregon is in service. (NWWind)

-   A new Nine Canyon wind generation project (50 MW) near Paterson,
    Washington is available but off-line. This replaces the 8 MW Energy
    NW Wind project. (EnNW)

-   The Satsop combined-cycle gas generation project (630 MW) near Elma,
    Washington is available but off-line. (DUKE)

-   The Starbucks combined-cycle gas generation project (1200 MW) near
    Little Goose Dam, Washington is available but off-line. (NWPwr)

-   The Beacon North -- Rathdrum 230 kV line is looped into a new Otis
    sub, where a new 230/115 kV transformer (300 MVA) is installed.
    (AVA)

-   The Bell -- Grand Coulee 500 kV line is in service. (BPA)

-   The Benton -- Glade -- Franklin 115 kV line is reconductored to 205
    MVA. (BPA)

-   The Benewah -- Shawnee 230 kV line is in service. (AVA)

-   The Bethel -- Santiam 230 kV line is in service, replacing service
    to Bethel from a tap on the Santiam -- Chemawa 230 kV line. (BPA)

-   A new Canby -- Twilight Tap -- Wilsonville line is upgraded from
    59.8 kV to 115 kV. (PGE)

-   A second Echo Lake -- Monroe 500 kV line (3460 MVA) is in service.
    (BPA)

-   The John Day -- McNary 500 kV line (3950 MVA) is in service. (BPA)

-   A long stretch of existing 69 kV line in the Olympic Peninsula,
    Washington area, running from Happy Valley to Port Angeles, is
    upgraded to 115 kV. (CLA)

-   In support of the Chehalis generation project, the Paul -- Allston
    #1 500 kV line is looped into a new 500 kV substation at Napavine.
    (BPA)

-   The San Juan submarine cable 34.5 kV to 69 kV upgrade is complete.
    (BPA)

-   The Schultz -- Kangley -- Echo Lake 500 kV line is in service,
    replacing the Schultz -- Raver #2 500 kV line. The line has 42%
    series compensation added at Schultz. (BPA)

-   The SnoKing tap on the Monroe -- Samammish 230 kV line, serving the
    SnoKing 230 kV bus, is removed and replaced with a SnoKing tap on
    the Echo Lake -- Monroe #1 500 kV line, along with a new 500/230 kV
    (1800 MVA) transformer. (BPA)

-   A Sherwood "A" -- Murray Hill 115 kV line (197 MVA) is in service.
    (PGE)

-   A second Sherwood -- Murray Hill 230 kV line (525 MVA) is in
    service. (PGE)

-   A new Sherwood -- Wilsonville 115 kV line (200 MVA) is in service.
    (PGE)

-   A new Shelton -- South Bremerton 230 kV line (400 MVA) plus a new
    230/115 kV transformer at South Bremerton (325 MVA) are in service.
    (BPA)

-   In support of the Starbuck generation, the Little Goose -- Lower
    Monumental 500 kV line is looped into a new Starbuck substation and
    a new 500 kV line from Starbuck to Lower Monumental is added. (BPA)

-   The existing Hanford -- John Day 500 kV and Hanford -- Ostrander 500
    kV lines are both looped into a new substation called Wautoma. From
    Wautoma, a new 500 kV line (3950 MVA) runs to Schultz substation.
    The new line replaces the Schultz -- Hanford 500 kV addition
    project. (BPA)

-   To support the Wallula generation project, the existing McNary --
    Sacajawea Tap 500 kV line is tapped at Smiths Harbor, and a new
    Smiths Harbor -- Wallula 500 kV line is added. (BPA)

-   A new Priest Rapids -- Wahluke - Frenchman -- Potholes 230 kV line
    (400 MVA) is in service. A new 672 MVA phase-shifter is installed in
    the Wahluke -- Frenchman section. A new 230/115 kV, 250 MVA
    transformer is installed at Frenchman sub. (GCPD)

-   The 500/230 kV transformer at Satsop substation is relocated to
    Shelton substation. The existing Paul -- Satsop 500 kV line is
    split, with the Paul section being extended and reterminated at
    Shelton and the Satsop section being operated at 230 kV and extended
    and reterminated at Olympia. (BPA)

-   The Bothell 230/115 kV transformers #2 and #3 are both upgraded to
    300 MVA. (SCL)

-   The second Pearl 500/230 kV transformer is in service. (BPA)

-   Series compensation (50%) has been added to the Bell -- Taft 500 kV
    line. (BPA)

-   Series compensation (50%) has been added to the Dworshak -- Taft 500
    kV line. (BPA)

-   Series compensation (45%) has been added to the Raver -- Schultz #1
    500 kV line. (BPA)

-   The 230 kV buses at Grand Coulee, McNary, Midway and Rocky Reach are

> re-modeled to show multiple sections around intervening circuit
> breakers. All except Midway are adjacent to large hydro plants, and
> the plants are re-modeled along powerhouse lines. At Coulee, the Area
> slack bus is changed from the first 18 units in aggregate to the
> single unit 22.

F. [AREA COORDINATOR: PACE]{.underline}

-   Added two 300 MVA 230 kV phase shifting transformers at Monument.

-   Added generation at Mona (619 MVA), Gadsby 7 & 8 (430 MVA) and
    Hunter 4

> (590 MVA).

\- Added Monument-Opal 230 kV line.

\- Added Point of Rocks-Rock Springs 230 kV line.

G. [AREA COORDINATOR: PACIFIC GAS AND ELECTRIC COMPANY]{.underline}

-   Added following generation: Gilroy Peakers 1-3 (150 MVA), SECAL 1-3

> (746 MVA), Sunset CC (606 MVA), Sunrise 3 (293 MVA), GWFTRACY 1-3
>
> (339 MVA), Three Mountain Project (660 MVA), and Metcalf Energy Center
> (777 MVA).

H. [AREA COORDINATOR: SIERRA PACIFIC POWER COMPANY]{.underline}

\- Added the Falcon-Gonder 345 kV project.

I. [AREA COORDINATOR: SOUTHERN CALIFORNIA]{.underline}

-   Added Otay generation (798 MVA) in SDG & E area.

-   Added Mission 230 kV statcom (+/- 200 MVAR).

-   Impedance and ratings changed on Imperial Valley -- LaRosita 230 kV
    tie line due to line bundling.

-   Miguel -- Tijuana 230 kV tie line replaced by Otay Mesa -- Tijuana
    230 kV.

-   Added SVD's at Miguel 230 kV (63 MVAR) and Sycamore 230 kV (126
    MVAR).

-   Added generation in CFE area: CCBC 1 & 2 (600 MVA) and LRP units 1-4

> (968 MVA).

-   Numerous topology changes in SDG & E and CFE areas.

> \- Added generation in LADWP area: Valley repower units 1-3 (714 MVA)
> and Haynes repower units 1-3 (714 MVA).

-   Removed Rinaldi -- Toluca 230 kV ck #3.

-   Added the Rinaldi -- Valley #2 and Valley -- Toluca #2 230 kV lines.

-   Added a fourth McCullough 500/230 kV transformer (400 MVA).

J. [AREA COORDINATOR: ROCKY MOUNTAIN]{.underline}

\- Added the Walsenburg-Gladstone 230 kV tie between Colorado and New
Mexico.

K.  [TECHNICAL STAFF]{.underline}

-   Listed below are series compensation levels portrayed on major
    transmission lines for the 2008 LSP1-SA base case:

Percent Series

[Arizona]{.underline} [Compensation]{.underline}

Cholla-Saguaro 500 kV 36

Coronado-Cholla 500 kV 0

Coronado-Silver King 500 kV 0

Four Corners-Cholla 345 kV (1 & 2) 25

Four Corners-Moenkopi 500 kV 0

Four Corners-West Mesa 345 kV 39

Greenlee-Winchester-Vail 345 kV 0

Liberty-Peacock-Mead 345 kV 35

McKinley-San Juan 345 kV (1 & 2) 30

Navajo-Crystal 500 kV 72

Crystal-McCullough 500 kV 70

Navajo-Moenkopi 500 kV 70

Navajo-Westwing 500 kV 40

Palo Verde-North Gila 500 kV 0

Perkins-Mead 500 kV 70

San Juan-BA 345 kV 39

Springerville-Greenlee 345 kV 38

Springerville-Luna 345 kV 26

Percent Series

[Arizona (cont.)]{.underline} [Compensation]{.underline}

Springerville-Vail 2 345 kV 40

Westwing-Yavapai 500 kV 43

Yavapai-Moenkopi 500 kV 28

[Canada]{.underline}

Ashton Creek -- Selkirk 500 kV 50

Cheekye-Kelly Lake 500 kV 55

G. M. Shrum-Williston 500 kV (1 & 2) 50

Kelly Lake-Clayburn 500 kV 55

Kelly Lake-Nicola 500 kV 50

Kelly Lake-Williston 500 kV (1 & 3) 50

Kennedy-Williston 500 kV 100

Nicola-Ingledow 500 kV 50

Nicola-Meridian 500 kV 50

Nicola -- Selkirk 500 kV 50

[Idaho]{.underline}

Boise Bench-Brownlee 230 kV (1 ‑ 4) 58

Bridger-Borah 345 kV 45

Bridger-Goshen 345 kV 45

Bridger-Kinport 345 kV 45

Brownlee-Ontario 230 kV 70

Midpoint-Boise Bench 230 kV (2 & 3) 28

Midpoint-Kinport 345 kV 30

Oxbow-Lolo 230 kV 0

[Montana]{.underline}

Broadview-Townsend-Garrison 500 kV (1 & 2) 35

Colstrip-Broadview 500 kV (1 & 2) 35

[Northwest]{.underline}

Alvey-Dixonville 500 kV 52

Alvey-Marion 500 kV 50

Bell BPA-Taft 500 kV 50

Buckley-Slatt 500 kV 29

Burns-Midpoint 500 kV 50

Burns-Summer Lake 500 kV 112

Coulee-Schultz 500 kV (1 & 2) 40

Dixonville-Meridian 500 kV 50

Dworshak-Taft 500 kV 50

Echo Lake-Schultz 500kV (2) 42

Garrison-Taft 500 kV (1 & 2) 31

Percent Series

[Northwest (cont.)]{.underline} [Compensation]{.underline}

Garrison-Townsend 500 kV (1 & 2) 81

Grizzly-Captain Jack 500 kV 62

Grizzly-Malin 500 kV 60

Malin-Summer Lake 500 kV 53

Ponderosa-Summer Lake 500 kV 72

Raver-Schultz 500 kV 45

Walla Walla-Enterprise 230 kV 66

[PG&E]{.underline}

Captain Jack-Olinda 500 kV 62

Gates-Midway 500 kV 64

Los Banos-Gates 500 kV 54

Los Banos-Midway 500 kV 58

Malin-Round Mountain 500 kV (1 & 2) (1) 62 (2) 64

Olinda-Maxwell-Tracy 500 kV 74

Round Mountain-Table Mountain 500 kV (1 & 2) 74

Table Mountain-Tesla 500 kV 66

Table Mountain-Vaca Dixon 500 kV 68

Tesla-Vaca Dixon 500 kV 75

[Southern California]{.underline}

Eldorado-Lugo 500 kV 35

Imperial Valley-Miguel 500 kV 51

Imperial Valley-North Gila 500 kV 52

Marketplace-Adelanto 500 kV line 47

McCullough-Victorville 500 kV (1 & 2) 35

Midway-Vincent 500 kV (1-2) 70 (3) 74

Mohave-Lugo 500 kV 35

Palo Verde-Devers 500 kV 47

Moenkopi-Eldorado 500 kV 70

[WAPA]{.underline}

Flagstaff-Glen Canyon 345 kV (1 & 2) (1) 70 (2) 69

Flagstaff-Pinnacle Peak 345 kV (1 & 2) 76

Shiprock-Kayenta-Glen Canyon 230 kV 80

![](media/image1.png){width="7.291666666666667in"
height="9.333333333333334in"}

SUPPLEMENTAL LINE FLOW SUMMARY

2008 LSP1-SA APPROVED BASE CASE

CANADA AND NORTHWEST

1\. Alberta - British Columbia

Langdon(\*) - Cranbrook 500 kV 171.6

Pocatera - Fording Coal Tap(\*) 138 kV 12.7

Colman - Natal(\*) 138 kV 15.5

TOTAL 199.9

2\. Canada - Northwest

Ingledow(\*) - Custer 1&2 500 kV 332.3

Nelway - Boundary(\*) 230 kV 168.5

TOTAL 500.8

3\. Northwest - California

Malin(\*) - Round Mt. 1&2 500 kV 2351.7

Delta(\*) - Cascade 115 kV 74.9

Captain Jack(\*) - Olinda 500 kV 1325.0

AC TOTAL 3751.6

Pacific DC Intertie at Sylmar 230 kV 2734.5

4\. North of John Day

Raver(\*) - Paul 500 kV 1009.2

Hanford(\*) - Wautoma 1&2 500 kV 1347.7

Ashe(\*) - Marion 500 kV 724.9

Ashe(\*) - Slatt 500 kV 912.7

Smiths Harbor Jct. - McNary(\*) 1&2 500 kV 1221.9

TOTAL 5216.4

NORTHEAST

1\. MPC High Line

Cut Bank - Cut Bank Pump(\*) 115 kV -13.6

Great Falls(\*) - Havre 161 kV 19.6

Conrad(\*) - Shelby 230 kV 27.8

TOTAL 33.8

2\. West of Taft

Taft(\*) - Dworshak 500 kV 572.8

Taft(\*) - Bell 500 kV 378.9

TOTAL 951.7

SUPPLEMENTAL LINE FLOW SUMMARY

2008 LSP1-SA BASE CASE

PAGE 2

3\. Southeast Montana Ties

Crossover(\*) - Huntley 230 kV 135.3

Crossover(\*) - Hardin 230 kV -57.3

Yellowtail - Rimrock PS(\*) 161 kV 29.3

Yellowtail - Billings PS(\*) 230 kV 65.7

TOTAL 172.9

4\. West of Borah

Kinport(\*) - Midpoint 345 kV 361.0

Borah(\*) - Adelaide 345 kV 278.6

Borah(\*) - Adelaide Tap 345 kV 255.2

American Falls(\*) - Pleasant Valley 138 kV 59.2

American Falls(\*) - Raft River 138 kV 45.7

TOTAL 999.7

5\. Bridger System West at Bridger

Bridger(\*) - Goshen, Kinport, and Borah 345 kV 1584.3

6\. Path C

Ben Lomond - Borah (\*) 345 kV -33.9

Treasureton - Brady (\*) 345 kV -45.5

Grace - Goshen (\*) 161 kV -73.7

Malad - American Falls (\*) 138 kV -29.1

TOTAL -182.2

7\. Brownlee East

Brownlee(\*) - Boise Bench 1-4 230 kV 506.3

Brownlee(\*) - Ontario 230 kV 230.7

Oxbow(\*) - McCall 138 kV 14.0

Quartz(\*) - Nelson Tap 138 kV -3.9

TOTAL 747.1

8\. Midpoint(\*) - Burns 500 kV 901.1

9\. Total 4A

Dave Johnston(\*) - Difficulty 230 kV 121.9

Riverton(\*) - Wyopo 230 kV 132.1

Spence(\*) - Mustang 230 kV 112.3

TOTAL 366.3

10\. Total 4B

Wyodak(\*) - Buffalo 230 kV 224.8

Spence(\*) - Badwater 230 kV 35.6

Alcova(\*) - Raderville 115 kV 25.0

Casper(\*) - Midwest 230 kV -14.8

Riverton(\*) - Thermopolis 230 kV -27.6

Riverton 230 kV(\*) - Riverton 115 kV 4.1

TOTAL 247.0

SUPPLEMENTAL LINE FLOW SUMMARY

2008 LSP1-SA BASE CASE

PAGE 3

11\. Intermountain DC at Intermountain 345 kV 1763.6

12\. Utah/Colorado - Nevada/Arizona/New Mexico

Red Butte(\*) - Harry Allen PS 345 kV 102.1

Sigurd PS - Glen Canyon(\*) 230 kV 215.8

Pinto PS - Four Corners(\*) 345 kV 331.7

Lost Canyon - Shiprock PS(\*) 230 kV 130.3

Hesperus - San Juan PS(\*) 345 kV 280.8

Durango - Coyote(\*) 115 kV 25.3

TOTAL 1086.0

13\. Sierra - PG&E

Summit 1 120(\*) - Drum 115 kV -13.4

Summit 2 120(\*) - Drum 115 kV -5.8

Summit 3(\*) - Cisco 60 kV -5.8

TOTAL -25.0

14\. Total 1A West

Artesia - Vernal(\*) 138 kV -8.2

Rangely - Bonanza(\*) 138 kV -60.8

Bears Ears - Bonanza(\*) 345 kV 42.4

TOTAL -26.6

15\. Total 2A South

Hesperus - San Juan PS(\*) 345 kV 280.8

Lost Canyon - Shiprock PS(\*) 230 kV 130.3

Durango - Coyote(\*) 115 kV 25.3

TOTAL 436.4

SOUTHEAST

1\. East of Colorado River (500-345 kV)

Navajo(\*) - Crystal 500 kV 1043.5

Moenkopi - Eldorado(\*) 500 kV 859.1

Palo Verde(\*) - Devers 500 kV 1048.5

Hassyampa(\*) - North Gila 500 kV 660.9

Perkins(\*) - Mead 500 kV -65.6

Liberty(\*) - Mead 345 kV -50.1

TOTAL 3496.3

2\. East of Colorado River (230 kV)

Harcuvar (Liberty) - Parker(\*) 230 kV -0.1

McConnico - Davis(\*) 230 kV -19.4

Eagle Eye - Parker(\*) 230 kV -5.8

TOTAL -25.4

SUPPLEMENTAL LINE FLOW SUMMARY

2008 LSP1-SA BASE CASE

PAGE 4

3\. Four Corners Area

Four Corners(\*) - Moenkopi 500 kV 933.3

Four Corners(\*) - Cholla 1&2 345 kV 891.0

TOTAL 1824.3

SOUTHWEST

1\. Northwest of the Colorado River

McCullough(\*) - Victorville 1&2 500 kV 1285.4

Eldorado(\*) - Lugo 500 kV 798.7

Marketplace(\*) - Adelanto 500 kV 642.4

Mohave(\*) - Lugo 500 kV 1028.8

Mead(\*) - Victorville 287 kV 117.5

Eldorado(\*) - Pisgah - Lugo 1&2 230 kV 136.7

J. Hinds - Mirage(\*) 230 kV 54.3

TOTAL 4063.7

2\. Other Flows

Palo Verde - Devers(\*) 500 kV 1025.0

North Gila(\*) - Imperial Valley 500 kV 634.0

El Centro - Imperial Valley(\*) 230 kV -30.9

MIRIID - Mirage(\*) 230 kV 166.5

Coachella - Devers(\*) 230 kV 131.0

TOTAL 1925.6

3\. Round Mtn.(\*) - Table Mtn. 1&2 500 kV 2762.4

4\. Table Mtn. 500 kV South

Table Mtn.(\*) - Vaca Dixon 500 kV 1780.8

Table Mtn.(\*) - Tesla 500 kV 1388.6

TOTAL 3169.5

5\. Table Mtn. 500/230 kV -444.0

6\. Midway - Los Banos (Path 15)

Gates(\*) - Los Banos 500 kV -484.6

Midway(\*) - Los Banos 500 kV -556.6

Gates(\*) - Panoche 1&2 230 kV -56.5

Gates(\*) - Gregg 230 kV 255.1

Gates(\*) - McCall 230 kV 49.6

TOTAL -793.0

SUPPLEMENTAL LINE FLOW SUMMARY

2008 LSP1-SA BASE CASE

PAGE 5

7\. Southern California Imports

Pacific DC Intertie at Sylmar 230 kV 2734.5

Intermountain DC at Adelanto 500 kV 1707.0

Midway(\*) - Vincent 1,2,3 500 kV 2048.9

McCullough(\*) - Victorville 1&2 500 kV 1285.4

Eldorado(\*) - Lugo 500 kV 798.7

Mohave(\*) - Lugo 500 kV 1028.8

Palo Verde - Devers(\*) 500 kV 1025.0

North Gila(\*) - Imperial Valley 500 kV 634.0

Marketplace(\*) - Adelanto 500 kV 642.4

Mead(\*) - Victorville 287 kV 117.5

Kramer - Lugo(\*) 1&2 230 kV 464.7

Victor - Lugo(\*) 1&2 230 kV -81.5

Eldorado(\*) - Pisgah - Lugo 1&2 230 kV 136.7

J. Hinds - Mirage(\*) 230 kV 54.3

El Centro - Imperial Valley(\*) 230 kV -30.9

MIRIID - Mirage(\*) 230 kV 166.5

Coachella - Devers(\*) 230 kV 131.0

TOTAL 12862.8

OTHER FLOWS \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--

West of the Colorado River 5989.3

Northeast - Northwest 2457.1

Southern California Inertia

LADWP 12489

\- Intermountain -5698

SOCALIF 57636

SANDIEGO 8214

Hoover A5-A7,N1-N7 7289

\-\-\-\-\-\--

79930.0

[PHASE SHIFTING TRANSFORMER REPRESENTATION]{.underline}

[FOR THE 2008 LSP1-SA BASE CASE]{.underline}

[AREA]{.underline} [PHASE SHIFTING TRANSFORMER]{.underline}
[REPRESENTATION]{.underline}

ARIZONA LIBTYPHS230 - LIBERTY 230 0.0 degrees fixed phase. Not used to
control a schedule. It is sometimes operated to reduce loading on
parallel lines.

ARIZONA PERK PS1500 - WESTWING 500 0.0 degrees fixed phase. Not used to
control a

PERK PS2500 - WESTWING 500 schedule in this case.

B.C. HYDRO NLY230 230 - NLYPHS 230 -20.0 degrees fixed phase. Used to
prevent overloading of the Nelway-Boundary 230 kV tie line.

LADWP SCATERGD230 - SCATERGD138 5.0 degrees fixed phase. Not used to
control a schedule. Used to prevent overloading of the Scattergood
cables.

MONTANA RIMROCK 161 - RMRK PHA 161 Regulating to hold -30 MW on the
Rimrock-Rimrock PHA 161 kV line.

MONTANA BILINGS 230 - BLGS PHA 230 Regulating to hold -59 MW on the
Billings-Billings PHA 230 kV line.

NEVADA CRSTL2PS230 - CRYSTAL 230 Two phase shifting transformers
regulating to

CRSTL3PS230 - CRYSTAL 230 hold 250 MW into the Nevada Power System.

NEVADA CRSTL N 500 - CRYSTAL 500 #1 Two phase shifting transformers
regulating to

CRSTL N 500 - CRYSTAL 500 #2 hold 0 MW on the Harry Allen -- Crystal
500 kV line.

NEVADA HA PS 345 - H ALLEN 345 Regulating to hold 100 MW on the Red
Butte-Harry Allen 345 kV line.

NEW MEXICO ARR PS345 - ARROYO 345 Regulating to hold 182 MW on the West
Mesa-Arroyo 345 KV line.

NORTHWEST BOX CANY 115 - BOX PS 115 This phase shifter is operated to
force flows south from Box Canyon.

NORTHWEST FRCHMNPS 230 - FRENCHMN 230 Regulating to hold 370 MW from
Priest Rapids 230 kV north to Potholes 230 kV. Used to reduce flows on
other utilities lines.

NORTHWEST TONO 115 - TONO PHA 115 -4.70 degrees fixed phase. Used to
reduce parallel flows within the PACW system.

[PHASE SHIFTING TRANSFORMER REPRESENTATION]{.underline}

[FOR THE 2008 LSP1-SA BASE CASE]{.underline}

[AREA]{.underline} [PHASE SHIFTING TRANSFORMER]{.underline}
[REPRESENTATION]{.underline}

NORTHWEST WEED JCT 115 - WEED JPS 115 Regulating to hold within +/- 10
MW of schedule between the Northwest and PG&E on the Delta‑Cascade 115
kV line. Schedule is 80 MW.

PACE MONUMENT 230 - MONU PST 230 #1 0.0 degrees fixed phase. These two
phase shifters

MONUMENT 230 - MONU PST 230 #2 are not used to control schedules. When
necessary, they are used to regulate flows on the Monument-Naughton
230 kV line.

PACE JFRSNPHA 161 - JEFFERSN 161 0.0 degrees fixed phase. The Jefferson
phase shifter is not used to control schedules. When necessary, it is
used to prevent overloading of the Goshen-Jefferson 161 kV line.

PACE PINTO 345 - PINTO PS 345 0.0 degrees fixed phase. Actual schedule
is

115 MW on the Pinto-Four Corners 345 kV line.

PACE SIGURD 230 - SIGURDPS 230 0.0 degrees fixed phase. Actual schedule
is

-250 MW on the Sigurd-Glen Canyon 230 kV line.

SIERRA BRDRTNPS 345 - BRDRTWN 345 Regulating to hold schedule of 158 MW
from the Northwest to Sierra on the Hill Top-Border Town-Valley Road 345
kV line.

SIERRA CAL SUB 120 - CAL S PS 120 Regulating to hold 0 MW from PG&E to
Sierra on the 2 Drum-Summit 120 kV lines and the Drum-Cisco 60 kV line.

SIERRA FT.CHUR 120 - FT.CH.PS.120 Regulating to hold schedule of 72 MW
from PACE and LADWP to Sierra on the Intermountain-Gonder and the Utah
Nev-Pavant 230 kV lines.

SIERRA SLVR PK 60 - SLVR PS 60 Regulating to hold schedule of 13 MW
between SPP and SCE on the Control-Nevada Border 55 kV lines.

SIERRA SLVR PKX 60 - SLVR PK 60 -40.8 degrees fixed phase. Operated in
series with the SLVR PK-SLVR PS 60 kV phase shifter.

SOCALIF INYO 115 - INYO PS 115 Regulating to hold 50 MW on the
Inyo-Owens 230 kV line.

[PHASE SHIFTING TRANSFORMER REPRESENTATION]{.underline}

[FOR THE 2008 LSP1-SA BASE CASE]{.underline}

[AREA]{.underline} [PHASE SHIFTING TRANSFORMER]{.underline}
[REPRESENTATION]{.underline}

WAPA L.C. GLEN PS 230 - GLENCANY 230 0.0 degrees fixed phase. Not used
to control a schedule.

WAPA R.M. SANJN PS345 - SAN JUAN345 0.0 degrees fixed phase. Actual
schedule is 118 MW on the Hesperus-San Juan 345 kV line.

WAPA R.M. SHIP PS 230 - SHIPROCK230 0.0 degrees fixed phase. Actual
schedule is 50 MW on the Lost Canyon-Shiprock 230 kV line.

WAPA U.M. CRSOVRUM230 - CROS.PHA230 Regulating to hold 40 MW on the
Crsovrum-Crsover PHA 230 kV line.

[2008 LSP1-SA Power Flow]{.underline}

[Analysis]{.underline}

The 2008 LSP1-SA base case represents maximum flow from Northwest to
California and northern to southern California under SCIT nomogram
limits during heavy spring runoff conditions.

Loads: 60% of summer peak loads in California with normal spring
conditions elsewhere. Late April 2008.

Generation: [Hydro]{.underline} [Thermal]{.underline}

Canada High \--

Northwest High Low

Idaho/Montana Median Median

Colorado/Wyoming Median Median

Northern California Hydro High \--

California High \--

Arizona/New Mexico/southern Nevada \-- Median

Interchange (MW): [Condition]{.underline} [Target]{.underline} [%
Rating]{.underline}

Canada-Northwest Low 500 16%

Northwest-CA/NV (COI/RATS) Maximum 4800 100%

(PDCI) Maximum 3100 100%

Path 15 S-N \-- \-- \--

Wyoming/Idaho-Northwest Low 400 17%

Montana-Northwest Moderate 1500 68%

Utah/Colorado-Southwest Moderate \-- \--

Southwest-California (EOR/WOR) Low 3000/4000 40%

Intermountain-Adelanto DC Heavy 1800 94%

Midway-Vincent Maximum 3000 100%

Conditions in the 2008 LSP1-SA base case, relative to the specific goals
of the case, are summarized below:

[Loads]{.underline}: Loads represented range from 60 percent to 85
percent of summer 2008 peak in California and from 60 percent to 100
percent of spring 2008 peak elsewhere.

[Generation]{.underline}: Desired patterns were achieved.

+----------------------------+-------------+------------+-------------+
| [Interchange]{.underline}  | [Desired]{  | [Sc        | [Actual]{   |
|                            | .underline} | heduled]{. | .underline} |
|                            |             | underline} |             |
+----------------------------+-------------+------------+-------------+
| Canada-Northwest           | 500         | 500        | 501 (c)     |
+----------------------------+-------------+------------+-------------+
| Northwest-CA/NV -          | 4800        | 4838       | 3919 (c)    |
| (COI/RATS)                 |             |            |             |
+----------------------------+-------------+------------+-------------+
| Path 15 S-N                | \--         | \--        | -793 (b)    |
+----------------------------+-------------+------------+-------------+
| Wyoming/Idaho-Northwest    | 400         | 1812       | 994 (c)     |
+----------------------------+-------------+------------+-------------+
| Montana-Northwest          | 1500        | 902        | 804 (c)     |
+----------------------------+-------------+------------+-------------+
| Utah/Colorado-Southwest    | \--         | \(a\)      | 1086 (b)    |
+----------------------------+-------------+------------+-------------+
| Southwest-California       | 3000/4000   | \(a\)      | 3496/5989   |
| (EOR/WOR)                  |             |            | (b)         |
|                            |             |            |             |
| (500/345 kV System)        |             |            |             |
+----------------------------+-------------+------------+-------------+
| Midway-Vincent             | 3000        | 3000       | 2049 (c)    |
+----------------------------+-------------+------------+-------------+

\(a\) A total interchange schedule for this path cannot be determined
because some transmission lines included in this total are internal to
an area and schedules for these lines are not available.

\(b\) See Supplemental Line Flow Summary.

\(c\) See Area Interchange Diagram.