Table 1: Extended Flows by Path Constrained EC1_1 Copper Sheet Direction Path Common Sum of Max. Flow (+/-) Case Limit Excess (MW) (MW) (GWh) + Interstate COI plus PDCI 7,900 11,502 3,017 + P01 Alberta-British Columbia 700 4,466 3,905 - P03 Northwest-British Columbia 3,150 8,436 14,486 + P08 Montana to Northwest 2,200 2,867 2,128 - P14 Idaho to Northwest 2,250 3,959 881 - P15 Midway-Los Banos 3,265 9,217 5,567 + P18 Montana-Idaho 337 662 375 + P22 Southwest of Four Corners 2,325 3,190 1,798 + P26 Northern-Southern California 4,000 12,966 23,645 + P29 Intermountain-Gonder 230 kV 200 410 1,133 + P31 TOT 2A 690 1,615 2,520 + P35 TOT 2C 600 1,602 2,624 + P36 TOT 3 1,680 2,508 459 + P45 SDG&E-CFE 408 1,939 4,310 + P47 Southern New Mexico (NM1) 1,048 1,996 2,885 + P61 Lugo-Victorville 500 kV Line 900 2,752 2,791 + P66 COI 4,800 11,502 14,843 + P73 North of John Day 8,400 10,930 1,936 + P76 Alturas Project 300 707 1,849 + P78 TOT 2B1 600 1,244 1,012 One of the most apparent increases in transmission flow as a result of the relaxed transmission constraints is observed on the paths between British Columbia and southern California, suggesting that upgrades of those paths would be the most beneficial assuming the hydro generation expansions modeled in British Columbia in the 2022 Common Case are realized and would result in excess hydro generation being available for use in the Western Interconnection. The predominant flow on Path 15 actually reversed in the Copper Sheet study as the effect of additional economy energy from the Northwest exceeded the deliveries from the southern Pacific Gas & Electric (PG&E) resources, such as Diablo Canyon, to the PG&E load centers.
Table 1: Extended Flows by Path Path Constrained Direction EC1_1 Copper Sheet (+/-) Common Case Limit (MW) Max. Flow (MW) Sum of Excess (GWh) Interstate COI plus PDCI + 7,900 11,502 3,017 P01 Alberta-British Columbia + 700 4,466 3,905 P03 Northwest-British Columbia - 3,150 8,436 14,486 P08 Montana to Northwest + 2,200 2,867 2,128 P14 Idaho to Northwest - 2,250 3,959 881 P15 Midway-Los Banos - 3,265 9,217 5,567 P18 Montana-Idaho + 337 662 375 P22 Southwest of Four Corners + 2,325 3,190 1,798 P26 Northern-Southern California + 4,000 12,966 23,645 P29 Intermountain-Gonder 230 kV + 200 410 1,133 P31 TOT 2A + 690 1,615 2,520 P35 TOT 2C + 600 1,602 2,624 P36 TOT 3 + 1,680 2,508 459 P45 SDG&E-CFE + 408 1,939 4,310 P47 Southern New Mexico (NM1) + 1,048 1,996 2,885 P61 Lugo-Victorville 500 kV Line + 900 2,752 2,791 P66 COI + 4,800 11,502 14,843 P73 North of John Day + 8,400 10,930 1,936 P76 Alturas Project + 300 707 1,849 P78 TOT 2B1 + 600 1,244 1,012 One of the most apparent increases in transmission flow as a result of the relaxed transmission constraints is observed on the paths between British Columbia and southern California, suggesting that upgrades of those paths would be the most beneficial assuming the hydro generation expansions modeled in British Columbia in the 2022 Common Case are realized and would result in excess hydro generation being available for use in the Western Interconnection. The predominant flow on Path 15 actually reversed in the Copper Sheet study as the effect of additional economy energy from the Northwest exceeded the deliveries from the southern Pacific Gas & Electric (PG&E) resources, such as Diablo Canyon, to the PG&E load centers.
2022EC1-1_CopperSheet_StudyReport_2011SP.docx