Case Summary Sheet 2020-21 Heavy Winter 2 Operating Base Case Purpose: OPERATING CASE – TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HEAVY FLOWS FROM NORTHWEST TO CALIFORNIA. Loads: Expected peak load for the months of December - February Time: 1800 – 2000 hours MST. Generation Hydro Thermal Renewables Canada High/Median -- -- Northwest High/Median High -- Idaho/Montana Median High -- Colorado/Wyoming Low High -- Northern California Hydro Median -- -- Northern California Low High -- Southern California Low High -- Arizona/New Mexico/Southern Nevada Low High -- Interchange (MW): Condition Target % Rating Northwest to British Columbia (Path 3) Moderate 15001 50% Northwest to California/Nevada COI (Path 66) Moderate 2000 42% PDCI (Path 65) Heavy 2400 75% Midway – Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) -- -- -- Montana to Northwest (Path 8) Moderate 1400 64% Utah/Colorado to Southwest (Path 31, 35, 78) -- -- -- Southwest to Calif. (EOR Path 49/WOR Path 46) Moderate 4000/5000 43%/47% Intermountain to Adelanto DC (Path 27) Heavy 2100 88% San Diego to CFE (Path 45) -- 60 15% Northern to Southern California (Path 26) Heavy 2800 70% Interchange: Desired Scheduled Actual Northwest to British Columbia (NWBCH) 15001 1500 1500 Northwest to California/Nevada (COI)(SPPNWPG&E) 2000 1885 1253 (PDCI)(NWLADWP) 2400 2334 2334 Path 15 S-N -- (a) -19.0 Path 14 (IDNW) -- 41 521 Path 8 (MontanaNW) 1400 422 281 Utah/Colorado to Southwest -- (a) 54.5 Southwest to Calif. (EOR/WOR) 4000/5000 (a) 2234.2/2432.5 Intermountain to Adelanto DC 2100 (a) 1409.5 Path 45 (San DiegoCFE) 60 0 0 Path 26 (PG&ESCE) 2800 2800 2102 (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. 1 . Minimum flows are required to represent the Canadian Entitlement. 17 Case Summary Sheet 2021 Heavy Summer 3 Operations Base Case Purpose: OPERATING CASE – TO REPRESENT ANTICIATED OPERATING CONDITIONS DURING LIGHT LOAD PERIODS. MODERATE FLOWS FROM THE NORTHWEST TO CALIFORNIA AND MODERATE TO HEAVY FLOWS FROM IDAHO/MONTANA TO THE NORTHWEST. Loads: Expected peak load for the months of June - August Time: 1500 – 1700 hours MDT Generation Hydro Thermal Renewables Canada High -- -- Northwest Median/High High -- Idaho/Montana Median High -- Colorado/Wyoming Low High -- Northern California Hydro High -- -- Northern California High High -- Southern California Low High -- Arizona/New Mexico/Southern Nevada Low High -- Interchange (MW): Condition Target % Rating Northwest to British Columbia (Path 3) Heavy -2300 73% Northwest to California/Nevada COI (Path 66) Maximum 4800 100% PDCI (Path 65) Heavy 2800 88% Midway – Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) Light -- -- Montana to Northwest (Path 8) Moderate 1200 55% Utah/Colorado to Southwest (Path 31, 35, 78) -- -- -- Southwest to Calif. (EOR Path 49/WOR Path 46) Low/Moderate 3000/5800 32%/57% Intermountain to Adelanto DC (Path 27) Heavy 2200 92% San Diego to CFE (Path 45) Low 150 37% Northern to Southern California (Path 26) Heavy 4000 100% Interchange: Desired Scheduled Actual Northwest to British Columbia (NW→BCH) -2300 -2300 -2302 Northwest to California/Nevada (COI)(SPP→NW→PG&E) 4800 4544 3558 (PDCI)(NW→LADWP) 2800 2711 2711 Path 15 S-N -- (a) -485.9 Path 14 (ID→NW) -- -76 -624 Path 8 (Montana→NW) 1200 435 -1 Utah/Colorado to Southwest -- (a) 833.8 Southwest to Calif. (EOR/WOR) 3000/5800 (a) 1625.7/4732.5 Intermountain to Adelanto DC 2200 (a) 1523.8 Path 45 (San Diego→CFE) 150 128 127 Path 26 (PG&E→SCE) 4000 4000 2984 18 Case Summary Sheet 2024 Light Spring 1 Specialized Base Case Purpose: SPECIALIZED CASE – To represent the lowest inertia forecasted in 2024. The expectation is that you will work with your operations and planning departments to determine the system conditions for the date and time specified. Loads: Loads consistent with the 2024 forecast for the date and time specified. Time: Conditions like May 27, 2019 at 04:00 MT, the lowest inertia day in 2019 Generation Hydro Thermal Renewables Consistent with date and time specified above. -- -- -- Interchange (MW): Condition Target % Rating Consistent with date and time specified above. -- -- -- Interchange: Desired Scheduled Actual Northwest to British Columbia (NWBCH) -- 1400 1401 Northwest to California/Nevada (COI)(SPPNWPG&E) -- -415 -436 (PDCI)(NWLADWP) -- -298 -298 Path 15 S-N -- (a) 777.3 Path 14 (IDNW) -- -119 29 Path 8 (MontanaNW) -- 1249 1156 Utah/Colorado to Southwest -- (a) -161.4 Southwest to Calif. (EOR/WOR) --/-- (a) 341.9/843.6 Intermountain to Adelanto DC -- (a) 1117.0 Path 45 (San DiegoCFE) -- 0 0 Path 26 (PG&ESCE) -- 1500 1421 NOTE: Where no target flows are specified actual scheduled transfers should be based on each area’s load and generation (deficiency/surplus) balance and economical generation dispatch. The objective of the case should be kept in mind and schedules should be coordinated between areas prior to data submittal. (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. 1 . Minimum flows are required to represent the Canadian Entitlement. 19 .