1

Western Wind and Solar Integration StudySite Selection Analysis

5/14/2008

2

3

4

Count of SiteID

Transmission Area Name Load_Correlation New_Site Power_Density Pre-Selected Transmission_REZ Grand TotalArizona (not including Palo Verde Hub) 281 85 518 2 72 958Colorado East 823 209 997 8 797 2834Colorado West 34 45 5 84Idaho East, Southwest Wyoming 364 189 717 32 1145 2447New Mexico 725 214 1324 20 694 2977Northern Nevada (Sierra Pacific Power) 171 2 535 4 712Southern Nevada 251 14 55 1 321Wyoming Central East 1433 352 1999 10 3579 7373

Inside Study Footprint 4082 1065 6190 72 6297 17706

California ISO - Northern California 125 9 595 40 2 771California ISO - San Diego Gas & Electric Area 6 12 23 3 44California ISO - Southern California Edison Area 26 16 1824 53 1919California South 6 44 50Imperial Irrigation District 2 30 1 33

So California group 40 28 1921 57 0 2046COB Transmission Hub 38 271 309Idaho Southwest (Idaho Power) 33 13 364 2 70 482Montana (Northwestern Energy, WAUW) 157 288 694 26 1165Northwest 309 39 2764 83 16 3211Utah 565 57 702 24 131 1479

Outside Study Footprint 1267 434 7311 232 219 9463

Outside WECC 1001 797 70 1868

Grand Total 6350 1499 14298 374 6516 29037

Selection Technique

5

Count of SiteID

Transmission Area Namebelow 20%

20% - 25%

25% - 30%

30% - 35%

35% - 40%

40% - 45%

45% - 50% 50% +

Grand Total

Arizona (not including Palo Verde Hub) 11 162 412 350 23 958Colorado East 27 125 446 1,000 599 473 160 4 2,834Colorado West 8 27 25 20 1 1 2 84Idaho East, Southwest Wyoming 17 71 285 396 729 734 215 2,447New Mexico 3 38 215 586 1,323 806 6 2,977Northern Nevada (Sierra Pacific Power) 12 159 313 221 7 712Southern Nevada 95 206 20 321Wyoming Central East 5 36 398 1,091 2,465 2,302 1,055 21 7,373

Inside Study Footprint 75 694 2,302 3,689 5,166 4,316 1,437 27 17,706Cumulative total 17,706 17,631 16,937 14,635 10,946 5,780 1,464 27

California ISO - Northern California 42 193 281 171 49 19 15 1 771California ISO - San Diego Gas & Electric Area 16 8 12 8 44California ISO - Southern California Edison Area 67 133 482 802 326 108 1 1,919California South 9 5 1 13 14 8 50Imperial Irrigation District 2 15 10 6 33

So California group 94 161 505 829 340 116 1 0 2,046COB Transmission Hub 16 86 158 49 309Idaho Southwest (Idaho Power) 1 48 168 236 29 482Montana (Northwestern Energy, WAUW) 25 126 394 410 197 13 1,165Northwest 41 595 1,367 861 261 44 14 28 3,211Utah 14 124 545 651 145 1,479

Outside Study Footprint 208 1,232 3,150 3,191 1,234 376 43 29 9,463Cumulative total 9,463 9,255 8,023 4,873 1,682 448 72 29

Outside WECC 1 79 517 498 614 159 1,868

Grand Total 283 1,927 5,531 7,397 6,898 5,306 1,639 56 29,037Cumulative total 29,037 28,754 26,827 21,296 13,899 7,001 1,695 56

Capacity Factor Range

6

Transmission Zones used in Site Selection

7

Annual Capacity Factor versus Site Selection Criteria

0%

10%

20%

30%

40%

50%

60%

70%

0 5000 10000 15000 20000 25000 30000

Ann

ual C

apac

ity F

acto

r

Load Correlation

New Sites

Power Density

Pre-Selected

Transmission Zones

8

Transmission Area Name # of SitesCapacity (MW)

Average Capacity Factor (%)

Colorado East 7 210 27%Idaho East, Southwest Wyoming 6 180 25%New Mexico 20 600 30%Wyoming Central East 10 300 45%

Inside Study Footprint 43 1,290 32%

California ISO - Northern California 40 1,200 19%California ISO - San Diego Gas & Electric Area 3 90 17%California ISO - Southern California Edison Area 48 1,440 25%Idaho Southwest (Idaho Power) 1 30 23%Imperial Irrigation District 1 30 12%Montana (Northwestern Energy, WAUW) 9 270 30%Northwest 52 1,560 28%Utah 6 180 24%

Outside Study Footprint 160 4,800 24%

Outside WECC 51 1,530 37%Grand Total 254 7,620 28%

Operating Pre-Selected Sites

9

Annual Capacity Factor versus Site Selection CriteriaInside Study Footprint

0%

10%

20%

30%

40%

50%

60%

0 2000 4000 6000 8000 10000 12000 14000 16000 18000

Ann

ual C

apac

ity F

acto

r

Load Correlation

New Sites

Power Density

Pre-Selected

Transmission Zones

10

Minimum (MW)

Peak (MW)

Energy (GWH)

Load Fac. (%)

Wind Energy (GWH)

Solar Energy (GWH)

Wind Capacity @35% (MW)

Solar PV Capacity @17% (MW)

Solar Concen. @37% (MW)

Wind Penetration (% of Peak Load)

Wind Penetration (% of Min. Load)

# Wind Farms

% Wind Farms Available

Arizona 6,041 22,686 100,516 51% 30,155 5,026 9,835 1,012 1,085 43% 163% 328 34%Colorado East 4,266 11,566 61,372 61% 18,411 3,069 6,005 618 663 52% 141% 200 7%Colorado West 670 1,522 8,717 65% 2,615 436 853 88 94 56% 127% 28 34%Idaho East, SW Wyoming 932 2,036 12,449 70% 3,735 622 1,218 125 134 60% 131% 41 2%New Mexico 2,205 5,183 30,208 67% 9,062 1,510 2,956 304 326 57% 134% 99 3%N Nevada 1,252 2,362 14,460 70% 4,338 723 1,415 146 156 60% 113% 47 7%Southern Nevada 2,566 9,811 39,642 46% 11,893 1,982 3,879 399 428 40% 151% 129 40%Wyoming Central East 1,677 3,326 22,155 76% 6,647 1,108 2,168 223 239 65% 129% 72 1%Inside Footprint (30%w/5%s) 20,532 56,418 289,519 59% 86,856 14,476 28,329 2,916 3,126 50% 138% 944 5%

Northern California 7,385 28,396 128,944 52% 25,789 3,868 8,411 779 835 30% 114% 280 36%San Diego 1,469 5,331 25,802 55% 5,160 774 1,683 156 167 32% 115% 56 128%Southern California 7,846 27,053 128,429 54% 25,686 3,853 8,378 776 832 31% 107% 279 15%CaSouth 4,720 12,574 64,812 59% 12,962 1,944 4,228 392 420 34% 90% 141 282%Imperial Irrigation District 264 1,492 5,415 41% 1,083 162 353 33 35 24% 134% 12 36%

So California group 14,597 46,281 224,459 55% 44,892 6,734 14,642 1,357 1,454 32% 100% 488 24%COB 129 294 1,759 68% 352 53 115 11 11 39% 89% 4 1%Idaho Southwest 1,250 3,592 17,962 57% 3,592 539 1,172 109 116 33% 94% 39 8%Montana 1,130 2,329 14,161 69% 2,832 425 924 86 92 40% 82% 31 3%PacNW 12,509 30,944 178,359 66% 35,672 5,351 11,635 1,078 1,156 38% 93% 388 12%Utah 2,204 7,834 41,433 60% 8,287 1,243 2,703 250 268 34% 123% 90 6%Outside Footprint (20%w/3%s) 44,497 110,198 607,077 63% 121,415 18,212 39,601 3,669 3,933 36% 89% 1,320 14%

Canada 13,491 25,487 165,096 74%

WECC Total 80,462 187,340 1,061,701 65% 208,271 32,688 67,929 6,585 7,060 36% 84% 2,264 8%

note: Solar Energy split 30% PV, 70% CSP

2017 Load Analysis

11

6-19-07 vision case - fewer nuke retirements DRAFTInstalled Wind Nameplate Capacity by State (GW)

2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 2022 2024 2026 2028Arizona 0.00 0.00 0.00 0.00 0.35 0.59 0.59 1.18 1.51 1.92 2.39 2.41 2.42 2.51 2.68Colorado 0.06 0.15 0.19 0.26 0.68 0.78 0.83 0.85 0.89 1.20 1.92 1.94 2.04 2.28 2.46New Mexico 0.00 0.17 0.30 0.41 0.60 0.83 1.67 2.24 2.63 3.46 3.53 3.84 3.96 4.52 5.02Nevada 0.00 0.00 0.00 0.00 0.71 1.73 2.10 2.61 3.56 4.11 4.31 4.38 4.61 5.44 7.38Wyoming 0.18 0.21 0.25 0.32 1.20 1.35 2.36 2.42 3.38 4.30 6.27 8.11 9.38 10.92 11.80

Inside Study Footprint 0.24 0.53 0.75 0.99 3.53 5.27 7.55 9.29 11.98 14.99 18.42 20.67 22.41 25.66 29.34

California 1.60 1.63 1.88 2.32 3.40 5.23 5.29 6.30 6.58 7.22 8.11 10.27 12.90 14.32 14.84Idaho 0.02 0.04 0.06 0.08 0.31 0.54 0.54 0.71 0.95 1.06 1.62 2.08 2.26 2.28 2.66Montana 0.00 0.07 0.11 0.14 0.57 0.64 1.02 1.51 2.10 2.40 2.88 3.44 3.55 4.48 4.96Oregon 0.25 0.25 0.33 0.44 0.96 1.48 1.59 1.93 2.30 3.12 3.93 4.56 5.26 5.60 7.47Utah 0.00 0.00 0.00 0.00 0.33 0.60 0.67 1.23 1.48 1.54 1.82 1.85 1.87 2.03 2.16Washington 0.24 0.34 0.51 0.68 0.75 1.35 1.46 1.70 2.74 4.51 5.04 6.16 8.08 9.17 9.30

Outside Study Footprint 2.11 2.33 2.88 3.66 6.33 9.84 10.58 13.38 16.16 19.86 23.41 28.36 33.92 37.88 41.38

Total 2.35 2.86 3.63 4.65 9.86 15.10 18.12 22.68 28.14 34.85 41.83 49.03 56.32 63.54 70.71

12

2006 WECC Hub Prices

0

20

40

60

80

100

120

1 2 3 4 5 6 7 8 9 10 11 12

Month

Ave

rage

Spo

t Pric

e ($

/MW

h)

COBCOB Off PeakFour CornersFour Corners Off PeakMeadMead Off PeakMid CMid C Off PeakMona Off-PeakMona PeakNP 15NP 15 Off PeakPalo VerdePalo Verde Off PeakSP 15SP 15 Off Peak

13

Inside Study Footprint

-

1,000

2,000

3,000

4,000

5,000

6,000

7,000

0% 10% 20% 30% 40% 50% 60%

Annual Capacity Factor

Ann

ual R

even

ue ($

K)

0

2000

4000

6000

8000

10000

12000

14000

Cum

ulat

ive

# of

Site

s

Annual Revenue ($K)Cumulative # of SitesSites needed

14

Annual Capacity Factor versus Site Selection CriteriaOutside Study Footprint

0%

10%

20%

30%

40%

50%

60%

70%

0 1000 2000 3000 4000 5000 6000 7000 8000 9000

Ann

ual C

apac

ity F

acto

r

Load Correlation

New Sites

Power Density

Pre-Selected

Transmission Zones

15

Outside Study Footprint

-

1,000

2,000

3,000

4,000

5,000

6,000

7,000

0% 10% 20% 30% 40% 50% 60%

Annual Capacity Factor (%)

Ann

ual R

even

ue ($

K)

0

1000

2000

3000

4000

5000

6000

7000

Cum

ulat

ive

# of

Site

sAnnual Revenue ($K)Cumulative # of SitesSites Needed

16

Annual Capacity Factor versus Site Selection CriteriaOutside WECC

0%

10%

20%

30%

40%

50%

60%

0 500 1000 1500 2000

Ann

ual C

apac

ity F

acto

r

Load Correlation

Power Density

Pre-Selected

17

Annual Capacity Factor versus Site Selection CriteriaInside Study Footprint (High C.F. 944)

45%

46%

47%

48%

49%

50%

51%

52%

53%

0 100 200 300 400 500 600 700 800 900 1000

Ann

ual C

apac

ity F

acto

r

Other Reasons

Transmission Zones

18

Annual Capacity Factor versus Site Selection CriteriaInside Study Footprint (High C.F. 944)

45%

46%

47%

48%

49%

50%

51%

52%

53%

0 5 10 15 20 25 30 35 40 45 50

Ann

ual C

apac

ity F

acto

r

Load Correlation

New Sites

Power Density

Pre-Selected

Transmission Zones

19

Inside Study FootprintHigh C.F. 944

5,000

5,200

5,400

5,600

5,800

6,000

6,200

6,400

45% 46% 47% 48% 49% 50% 51% 52% 53%

Annual Capacity Factor

Ann

ual R

even

ue ($

K)

0

2000

4000

6000

8000

10000

12000

14000

Cum

ulat

ive

# of

Site

s

Annual Revenue ($K)Cumulative # of SitesSites needed

20

Annual Capacity Factor versus Site Selection CriteriaOutside Study Footprint (High C.F. 1,320)

0%

10%

20%

30%

40%

50%

60%

70%

0 200 400 600 800 1000 1200

Ann

ual C

apac

ity F

acto

r

Load Correlation

New Sites

Power Density

Pre-Selected

Transmission Zones

21

Outside Study FootprintHigh C.F. 1,320

-

1,000

2,000

3,000

4,000

5,000

6,000

7,000

30% 35% 40% 45% 50% 55% 60%

Annual Capacity Factor (%)

Ann

ual R

even

ue ($

K)

0

1000

2000

3000

4000

5000

6000

7000

Cum

ulat

ive

# of

Site

s

Annual Revenue ($K)Cumulative # of SitesSites Needed

22

Annual Capacity Factor versus Site Selection CriteriaHigh C.F. 2,264

0%

10%

20%

30%

40%

50%

60%

70%

0 500 1000 1500 2000

Ann

ual C

apac

ity F

acto

r

Load Correlation

New Sites

Power Density

Pre-Selected

Transmission ZonesTransmission Zones

23

“In Area” Sites

24

“High Capacity Factor” Sites

25

In Area Scenario

Count for "In Area sites"

Transmission Area Name25% - 30%

30% - 35%

35% - 40%

40% - 45%

45% - 50% 50% +

Grand Total

Wind Capacity Installed (MW)

Wind Capacity Required (MW)

Wind "Exports" (MW)

Arizona (not including Palo Verde Hub) 305 23 328 9,840 9,835 5 Colorado East 36 160 4 200 6,000 6,005 (5) Colorado West 4 20 1 1 2 28 840 853 (13) Idaho East, Southwest Wyoming 41 41 1,230 1,218 12 New Mexico 93 6 99 2,970 2,956 14 Northern Nevada (Sierra Pacific Power) 40 7 47 1,410 1,415 (5) Southern Nevada 109 20 129 3,870 3,879 (9) Wyoming Central East 51 21 72 2,160 2,168 (8)

Inside Study Footprint 109 369 50 130 259 27 944 28,320 28,329 (9) Cumulative total 944 835 466 416 286 27

California ISO - Northern California 25 171 49 19 15 1 280 8,400 8,411 (11) California ISO - San Diego Gas & Electric Area - 1,683 (1,683) California ISO - Southern California Edison Area 31 326 108 1 466 13,980 8,378 5,602 California South 14 8 22 660 4,228 (3,568) Imperial Irrigation District - 353 (353)

So California group 0 31 340 116 1 0 488 14,640 14,642 (2) COB Transmission Hub 4 4 - 115 (115) Idaho Southwest (Idaho Power) 10 29 39 1,170 1,172 (2) Montana (Northwestern Energy, WAUW) 18 13 31 930 924 6 Northwest 41 261 44 14 28 388 11,640 11,635 5 Utah 90 90 2,700 2,703 (3)

Outside Study Footprint 25 257 769 197 43 29 1320 39,600 39,601 (1) Cumulative total 1320 1295 1038 269 72 29

Grand Total 134 626 819 327 302 56 2264 67920 67,929 (9)

Capacity Factor Range

26

In Area Scenario

Count for "In Area sites"

Transmission Area Name Load_Correlation New_Site Power_Density Pre-Selected Transmission_REZ Grand TotalArizona (not including Palo Verde Hub) 32 10 243 43 328Colorado East 16 8 176 200Colorado West 11 12 5 28Idaho East, Southwest Wyoming 1 3 37 41New Mexico 10 13 76 99Northern Nevada (Sierra Pacific Power) 2 45 47Southern Nevada 104 2 23 129Wyoming Central East 1 2 5 64 72

Inside Study Footprint 177 12 349 5 401 944

California ISO - Northern California 44 235 1 280California ISO - San Diego Gas & Electric AreaCalifornia ISO - Southern California Edison Area 1 12 442 11 466California South 22 22Imperial Irrigation District

So California group 1 12 464 11 0 488COB Transmission Hub 4 4Idaho Southwest (Idaho Power) 8 31 39Montana (Northwestern Energy, WAUW) 4 27 31Northwest 17 16 355 388Utah 2 58 30 90

Outside Study Footprint 76 28 1174 12 30 1320

Grand Total 253 40 1523 17 431 2264

Selection Technique

27

High Capacity Factor ScenarioCount for "High Capacity Factor sites"

Transmission Area Name35% - 40%

40% - 45%

45% - 50% 50% +

Grand Total

Wind Capacity Installed (MW)

Wind Capacity Required (MW)

Wind "Exports" (MW)

Arizona (not including Palo Verde Hub) 0 - 9,835 (9,835)Colorado East 97 4 101 3,030 6,005 (2,975) Colorado West 1 2 3 90 853 (763) Idaho East, Southwest Wyoming 113 113 3,390 1,218 2,172 New Mexico 0 - 2,956 (2,956) Northern Nevada (Sierra Pacific Power) 0 - 1,415 (1,415) Southern Nevada 0 - 3,879 (3,879) Wyoming Central East 706 21 727 21,810 2,168 19,642

Inside Study Footprint 917 27 944 28,320 28,329 (9) Cumulative total 944 27

California ISO - Northern California 32 19 15 1 67 2,010 8,411 (6,401) California ISO - San Diego Gas & Electric Area 0 - 1,683 (1,683) California ISO - Southern California Edison Area 219 108 1 328 9,840 8,378 1,462 California South 12 8 20 600 4,228 (3,628) Imperial Irrigation District 0 - 353 (353)

So California group 231 116 1 0 348 10,440 14,642 (4,202) COB Transmission Hub 0 - 115 (115) Idaho Southwest (Idaho Power) 16 16 480 1,172 (692) Montana (Northwestern Energy, WAUW) 333 197 13 543 16,290 924 15,366 Northwest 190 44 14 28 276 8,280 11,635 (3,355) Utah 70 70 2,100 2,703 (603)

Outside Study Footprint 872 376 43 29 1320 39,600 39,601 (1) Cumulative total 1320 448 72 29

Grand Total 872 376 960 56 2264 67920 67,929 (9)

Capacity Factor Range

28

Count for "High Capacity Factor sites"

Transmission Area Name Load_Correlation New_Site Power_Density Pre-Selected Transmission_REZ Grand TotalArizona (not including Palo Verde Hub)Colorado East 7 6 88 101Colorado West 3 3Idaho East, Southwest Wyoming 3 7 103 113New Mexico 0Northern Nevada (Sierra Pacific Power) 0Southern Nevada 0Wyoming Central East 2 3 5 5 712 727

Inside Study Footprint 15 3 18 5 903 944

California ISO - Northern California 17 50 67California ISO - San Diego Gas & Electric Area 0California ISO - Southern California Edison Area 1 12 308 7 328California South 20 20Imperial Irrigation District 0

So California group 1 12 328 7 0 348COB Transmission Hub 0Idaho Southwest (Idaho Power) 5 11 16Montana (Northwestern Energy, WAUW) 25 60 458 543Northwest 11 1 264 276Utah 1 44 25 70

Outside Study Footprint 60 73 1155 7 25 1320

Grand Total 75 76 1173 12 928 2264

Selection Technique

High Capacity Factor Scenario

29

in Area ScenarioTransmission Area Name Count Annual Energy Avg. C.F.Arizona (not including Palo Verde Hub) 328 27,565,060 32.0%Colorado East 200 24,198,654 46.0%Colorado West 28 2,785,951 37.9%Idaho East, Southwest Wyoming 41 5,108,036 47.4%New Mexico 99 11,172,605 42.9%Northern Nevada (Sierra Pacific Power) 47 4,105,525 33.2%Southern Nevada 129 9,541,619 28.1%Wyoming Central East 72 9,290,094 49.1%

Inside Study Footprint 944 93,767,544 37.8%

California ISO - Northern California 280 24,759,320 33.6%California ISO - Southern California Edison Area 466 45,791,984 37.4%California South 22 2,237,187 38.7%COB Transmission Hub 4 348,648 33.2%Idaho Southwest (Idaho Power) 39 3,613,022 35.3%Montana (Northwestern Energy, WAUW) 31 3,647,731 44.8%Northwest 388 38,924,373 38.2%Utah 90 8,491,820 35.9%

Outside Study Footprint 1320 127,814,087 36.8%

Grand Total 2264 221,581,631 37.2%

30

High Capacity Factor ScenarioTransmission Area Name Count Annual Energy Avg. C.F.Colorado East 101 12,558,205 47.3%Colorado West 3 389,367 49.4%Idaho East, Southwest Wyoming 113 13,836,412 46.6%Wyoming Central East 727 89,648,682 46.9%

Inside Study Footprint 944 116,432,665 46.9%

California ISO - Northern California 67 7,102,737 40.3%California ISO - Southern California Edison Area 328 33,185,167 38.5%California South 20 2,051,937 39.0%Idaho Southwest (Idaho Power) 16 1,517,618 36.1%Montana (Northwestern Energy, WAUW) 543 55,664,930 39.0%Northwest 276 28,727,275 39.6%Utah 70 6,642,652 36.1%

Outside Study Footprint 1320 134,892,316 38.9%

Grand Total 2264 251,324,982 42.2%

31

Region Sites Required

Annual Energy (GWH)

Average Capacity Factor (%)

Inside Study Footprint 699 86,929 47.3%

Outside Study Footprint 1,176 121,456 39.3%

Total 1,875 208,384 42.3%

High Capacity Factor Scenario

32

Summary Comments•Pre-Selected capacity represents existing and planned sites rounded up to nearest 30 MW.

-Ignore “planned” sites in Scenario creation.

•How much capacity can be reasonably exported (imported) at each area?

•Assume constant energy between scenarios rather than constant number of plants:

Avg Wyoming C.F/Avg Arizona Plant = 49.1/32.0 = 1.53

~Roughly 2 MW of wind in Wyoming produces the same energy as 3 MW of wind in Arizona.

•Initial Study Scenarios: Baseline (I.e. Pre-Selected Sites)

High Renewables: - In Area

•Subsequent Scenarios: High Capacity Factor

“Constrained” High Capacity Factor

33

Summary Comments•Transmission costs estimated at $1350/MW mile.

•New Wind plant costs estimated at $1750/KW.

•Therefore saving a MW of wind capacity would pay for roughly 1300 miles of transmission. Phoenix, AZ to central Wyoming is about 650 miles, so a MW of Wind capacity would pay for the cost of 2 MW of transmission.

34

Count of Solar_Site Solar TypeTransmission_Area CSP PV Grand TotalArizona (not including Palo Verde Hub) 41 18 59Colorado East 44 16 60Colorado West 7 10 17Idaho East, Southwest Wyoming 4 12 16New Mexico 16 14 30Northern Nevada (Sierra Pacific Power) 17 4 21Southern Nevada 21 7 28Wyoming Central East 11 11

Inside Study Footprint 150 92 242

California ISO - Northern California 38 30 68California ISO - San Diego Gas & Electric Area 1 5 6California ISO - Southern California Edison Area 70 17 87California South 5 12 17Imperial Irrigation District 7 5 12

So California group 83 39 122COB Transmission Hub 22 4 26Idaho Southwest (Idaho Power) 5 5Montana (Northwestern Energy, WAUW) 11 11Northwest 52 52Utah 21 12 33

Outside Study Footprint 164 153 317

WECC Total 314 245 559

ERCOT South Zone 1 1ERCOT West Zone 128 5 133Nebraska 3 3North & South Dakota 11 11SPP Central Region 50 8 58SPP North 9 2 11

Outside WECC 187 30 217

Grand Total 501 275 776

35

Minimum (MW)

Peak (MW)

Energy (GWH)

Solar Energy (GWH)

Solar PV Capacity @17% (MW)

Solar Concen. @37% (MW) # PV Sites

% PV sites available

# Concen. Sites

% Concen. Sites available

Arizona 6,041 22,686 100,516 5,026 1,012 1,085 10 56% 11 27%Colorado East 4,266 11,566 61,372 3,069 618 663 6 38% 7 16%Colorado West 670 1,522 8,717 436 88 94 1 10% 1 14%Idaho East, SW Wyoming 932 2,036 12,449 622 125 134 1 8% 1 25%New Mexico 2,205 5,183 30,208 1,510 304 326 3 21% 3 19%N Nevada 1,252 2,362 14,460 723 146 156 1 25% 2 12%Southern Nevada 2,566 9,811 39,642 1,982 399 428 4 57% 4 19%Wyoming Central East 1,677 3,326 22,155 1,108 223 239 2 18% 2 -Inside Footprint (30%w/5%s) 20,532 56,418 289,519 14,476 2,916 3,126 29 32% 31 21%

Northern California 7,385 28,396 128,944 3,868 779 835 8 27% 8 21%San Diego 1,469 5,331 25,802 774 156 167 2 40% 2 200%Southern California 7,846 27,053 128,429 3,853 776 832 8 47% 8 11%CaSouth 4,720 12,574 64,812 1,944 392 420 4 33% 4 80%Imperial Irrigation District 264 1,492 5,415 162 33 35 0 0% 0 0%

So California group 14,597 46,281 224,459 6,734 1,357 1,454 14 36% 15 18%COB 129 294 1,759 53 11 11 0 0% 0 0%Idaho Southwest 1,250 3,592 17,962 539 109 116 1 20% 1 -Montana 1,130 2,329 14,161 425 86 92 1 9% 1 -PacNW 12,509 30,944 178,359 5,351 1,078 1,156 11 21% 12 -Utah 2,204 7,834 41,433 1,243 250 268 3 25% 3 14%Outside Footprint (20%w/3%s) 44,497 110,198 607,077 18,212 3,669 3,933 37 24% 39 24%

Canada 13,491 25,487 165,096

WECC Total 80,462 187,340 1,061,701 32,688 6,585 7,060 66 27% 71 23%

note: Solar Energy split 30% PV, 70% CSPnote 2: All Solar sites assumed to be 100 MW

36

Summary Comments - Solar•How much existing Solar generation is there?

-Can we ignore Solar in the Baseline?

•Does existing Solar generation match up with CSP and PV site data?