WECC Guideline 2016 Base Case Compilation Schedule Date: TSS Approved Meeting PDF Free Download

WECC Guideline 2016 Base Case Compilation Schedule Date: TSS Approved Meeting 170 Introduction The System Review Work Group (SRWG) compiles eleven steady state and dynamic base cases (base cases) to meet WECC s requirements to compile interconnection-wide base cases. The 2016 Base Case Compilation Schedule provides base case descriptions and schedule for base cases to be compiled during the 2016 calendar year. Objectives The objectives of the 2016 Base Case Compilation Schedule are: I. Provide a detailed schedule, to appropriate stakeholders, identifying necessary data submittals and data review milestones to compile eleven bases cases. II. Identify bases cases to be compiled. A typical annual base case compilation schedule includes the following base cases: a. Five operating cases b. Three scenario cases c. One five-year summer planning case d. One five-year winter planning case e. One 10-year planning case (alternate winter and summer) Supporting Information Timely submittal of steady state and dynamics data is necessary for the 2016 Base Case Compilation Schedule to be maintained. In the event of delayed steady state and dynamic data submittals, the SRWG will follow the Late Data Procedure provided in the WECC Data Preparation Manual. Typical base cases are intended to model anticipated load levels, but in some instances may model slightly heavier or slightly lighter than anticipated load levels to achieve desired stressed transfer levels on designated paths. Typical base cases usually include operating cases, five-year cases, ten-year cases, and additional cases as requested by the TSS. Scenario base cases are intended to represent critical operating conditions such as severe weather events, equipment out of service (transmission lines, reactive devices, or static var compensators), unusual generation patterns due to forced outages, and insecure voltage conditions. Some cases may represent extreme load conditions (up to 105 percent of forecasted peak) in a particular subregion. Data submitters should not be reluctant to model a condition due to lack of historical record of the scenario actually occurring. The 2016 Base Case Compilation Schedule includes the following base cases: WESTERN ELECTRICITY COORDINATING COUNCIL 155 North 400 West, Suite 200 Salt Lake City, Utah 84103-1114

2015 Base Case Compilation Schedule 2 Typical base cases o Operating base cases 2016-17 Heavy Winter 2016-17 Light Winter 2017 Heavy Spring 2017 Heavy Summer 2017 Light Summer o Five-year base cases 2022 Heavy Summer 2021-22 Heavy Winter o Ten-year base cases 2026-27 Heavy Winter 2027 Heavy Summer Scenario base cases o 2017 Light Spring in Desert Southwest o 2018 Light Autumn in Northwest Generation and load levels referred to in the base case description sheets refer to the season being studied. For example, if a case description sheet for a winter base case calls for high hydro in a specific area, this means high levels of hydro generation for a winter condition. In some areas, a high level of hydro generation in the winter may be less than median hydro generation levels in the spring or summer. Also, light loads may be increased in the importing areas or heavy loads may be decreased in exporting areas to represent the desired interchange schedules. Specific information on the desired load levels is contained in the base case description sheets and should be used as a guide in preparing cases. Interchange Schedules in the base case description sheets refer to the target flows that should be reached to represent anticipated flow levels and direction for the season being studied. Interchange definitions are included below for reference. During the process of compiling each base case, WECC staff and the appropriate functional entities participating in base case compilation process should follow the data requirements and procedures outlined in the WECC Data Preparation Manual. Following the documented requirements and procedures will contribute to developing base cases with compatible steady state and dynamic data, help to ensure the Transmission System is adequately modeled, and aid in continual improvement in the accuracy of the data submitted. W E S T E R N E L E C T R I C I T Y C O O R D I N A T I N G C O U N C I L

2016 Base Case Compilation Schedule CASE DATE DATA REQUEST MAILED DATE DATA DUE TO SUB COORD DATE L&R INFO DUE TO SUB COORD DATE DATA DUE TO AREA COORD DATE DATA DUE TO STAFF STAFF SEND CASE FOR REVIEW DATE COMMENTS DUE TO AREA COORD DATE AREA COORDINATOR COMMENTS DUE TO STAFF STAFF FINALIZE DATE 2018 HS1-S 07/03/15 07/17/15 07/24/15 08/28/15 09/11/15 09/25/15 10/02/15 10/16/15 20XX-Regional 08/07/15 08/21/15 08/28/15 10/02/15 10/16/15 10/30/15 11/06/15 11/20/15 2025-26 HW1 09/11/15 09/25/15 10/02/15 11/06/15 11/20/15 11/27/15 12/04/15 12/18/15 2026 HS1 10/16/15 10/30/15 11/06/15 12/11/15 12/25/15 01/01/16 01/08/16 01/22/16 2016-17 HW3-OP 11/20/15 12/04/15 12/11/15 01/15/16 01/29/16 02/12/16 02/19/16 03/04/16 2016-17 LW2-OP 11/20/15 12/18/15 12/25/15 01/29/16 02/12/16 02/26/16 03/04/16 03/18/16 2017 HSP1-OP 01/15/16 01/29/16 02/05/16 03/11/16 03/25/16 04/08/16 04/15/16 04/29/16 2021-22 HW2 02/26/16 03/11/16 03/18/16 04/22/16 05/06/16 05/13/16 05/20/16 06/03/16 2022 HS1 04/01/16 04/15/16 04/22/16 05/27/16 06/10/16 06/17/16 06/24/16 07/08/16 2017 HS2-OP 05/06/16 05/20/16 05/27/16 07/01/16 07/15/16 07/22/16 07/29/16 08/12/16 2017 LS1-OP 05/06/16 06/03/16 06/10/16 07/15/16 07/22/16 07/29/16 08/12/16 08/26/16 2017 LSP2-S 07/01/16 07/15/16 07/22/16 08/26/16 09/09/16 09/23/16 09/30/16 10/14/16 2018 LA1-S 08/05/16 08/19/16 08/26/16 09/30/16 10/14/16 10/28/16 11/04/16 11/18/16 2026-27 HW1 09/09/16 09/23/16 09/30/16 11/04/16 11/18/16 11/25/16 12/02/16 12/16/16 2027 HS1 10/14/16 10/28/16 11/04/16 12/09/16 12/23/16 12/30/16 01/06/17 01/20/17 2015 Base Cases 3

2016-2017 HEAVY WINTER 17HW3-OP CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: December 11, 2015 To Staff: January 15, 2016 II. PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HEAVY FLOWS FROM NORTHWEST TO CALIFORNIA. III. ITEMS TO BE PREPARED: From Case 2015-16HW3 Operating Case Stability Data Master Dynamics File 1 IV. Significant Changes LOADS 2 : Expected peak load for the months of December - February V. TIME: 1800 2000 hours MST From Existing System VI. GENERATION HYDRO THERMAL RENEWABLE 3 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 -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate -1400 5 46% Northwest to California/Nevada COI (Path 66) Moderate 2000 42% PDCI (Path 65) Heavy 1500 75 6 % 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 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) Moderate 4000/5000 43%/47% Intermountain to Adelanto DC (Path 27) Heavy 1850 96% San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) Heavy 2800 70% 1 Only Corrections to the Master Dynamics File (MDF) or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 5 Minimum flows are required to represent the Canadian Entitlement. 6 PDCI de-rated during construction to 2000MW. 4

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. 5

2016-2017 LIGHT WINTER 17LW2-OP CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: December 25, 2015 To Staff: January 29, 2016 II. PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS DURING LIGHT LOAD PERIODS. III. ITEMS TO BE PREPARED: From Case 2015-16LW2 Operating Case Stability Data Master Dynamics File 1 IV. Significant Changes LOADS 2 : Expected minimum load for the months of December - February V. TIME: Early morning (0300 to 0500 hours MST), winter conditions. From Existing System VI. GENERATION HYDRO THERMAL RENEWABLE 3 Canada Median/Low -- -- Northwest Low Median/Low -- Idaho/Montana Median Median -- Colorado/Wyoming Low Median -- Northern California Hydro Median -- -- Northern California Low Median -- Southern California -- Median -- Arizona/New Mexico/Southern Nevada -- Median -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) Low -1400 5 46% Northwest to California/Nevada COI (Path 66) Moderate 0<-500 14% PDCI (Path 65) Moderate 0<-500 25 6 % Midway Los Banos S-N (Path 15) Heavy 3450 64% Idaho to Northwest (Path 14) Heavy >1000 42% Montana to Northwest (Path 8) Heavy 2000 91% Utah/Colorado to Southwest -- -- -- (Path 31, 35, 78 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) Moderate 5100/6900 54%/65% Intermountain to Adelanto DC (Path 27) Heavy 1850 77% San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) -- -- -- 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 5 Minimum flows are required to represent the Canadian Entitlement. 6 PDCI de-rated during construction to 2000MW. 6

2017 HEAVY SPRING 17HSP1-OP CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: February 05, 2016 To Staff: March 11, 2016 II. PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HIGH FLOWS FROM NORTHWEST TO CALIFORNIA. III. ITEMS TO BE PREPARED: From Case 16HSP1 Operating Case Stability Data Master Dynamics File 1 IV. Significant Changes LOADS 2 : Expected peak load for the months of March - May V. TIME: 1600 to 2000 hours MDT. From Existing System VI. GENERATION HYDRO THERMAL RENEWABLE 3 Canada Median -- -- Northwest High Low -- Idaho/Montana High Median -- Colorado/Wyoming Median Median -- Northern California Hydro Median -- -- Northern California High Low -- Southern California -- -- -- Arizona/New Mexico/Southern Nevada Median Median -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate -1400 5 46% Northwest to California/Nevada COI (Path 66) Maximum 4800 100% PDCI (Path 65) Maximum 2000 62% Midway Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) Low -400 17% Montana to Northwest (Path 8) Moderate 1500 68% Utah/Colorado to Southwest -- -- -- (Path 31, 35, 78 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) Low 3600/4500 38%/43% Intermountain to Adelanto DC (Path 27) Heavy 1850 77% San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) Heavy 2800 93% 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 5 Minimum flows are required to represent the Canadian Entitlement. 8

2021-2022 HEAVY WINTER 22HW2 CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: March 18, 2016 To Staff: April 22, 2016 II. PURPOSE: GENERAL 5-YEAR CASE - WITH TYPICAL FLOWS THROUGHOUT WECC. III. ITEMS TO BE PREPARED: From Case 2020-21 HW1 Stability Data Master Dynamics File 1 IV. Significant Changes LOADS 2 : Expected peak load for the months of December - February V. TIME: 1800 2000 hours MST From Existing System VI. GENERATION HYDRO THERMAL RENEWABLE 3 Canada High -- -- Northwest High High -- Idaho/Montana Median High -- Colorado/Wyoming Low High -- Northern California Hydro Median -- -- Northern California Low Median -- Southern California Low Median -- Arizona/New Mexico/Southern Nevada Low Median -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate -1400 5 46% Northwest to California/Nevada COI (Path 66) -- -- -- PDCI (Path 65) -- -- -- Midway Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) -- -- -- Montana to Northwest (Path 8) -- -- -- Utah/Colorado to Southwest -- -- -- (Path 31, 35, 78 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) -- -- -- San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) -- -- -- 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 5 Minimum flows are required to represent the Canadian Entitlement. 10

2022 HEAVY SUMMER 22HS1 CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: April 22, 2016 To Staff: May 27, 2016 II. PURPOSE: GENERAL 5-YEAR CASE WITH TYPICAL FLOWS THROUGHOUT WECC. III. ITEMS TO BE PREPARED: From Case 21HS2 Stability Data Master Dynamics File 1 IV. Significant Changes LOADS 2 : Expected peak load for the months of June - August V. TIME: 1500 to 1700 hours MDT From Existing System VI. GENERATION HYDRO THERMAL RENEWABLE 3 Canada High -- -- Northwest Median 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 -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) High >2000 66% Northwest to California/Nevada COI (Path 66) -- -- -- PDCI (Path 65) -- -- -- Midway Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) -- -- -- Montana to Northwest (Path 8) -- -- -- Utah/Colorado to Southwest -- -- -- (Path 31, 35, 78 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) -- -- -- San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) -- -- -- 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. 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 12

2017 HEAVY SUMMER 17HS2-OP CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: May 27, 2016 To Staff: July 01, 2016 II. PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HEAVY FLOWS TO CALIFORNIA FROM THE NORTHWEST AND MODERATE FLOWS ELSEWHERE. III. ITEMS TO BE PREPARED: From Case 16HS4-Operating Case Stability Data Master Dynamics File 1 IV. Significant Changes LOADS 2 : Expected peak load for the months of June - August V. TIME: Peak time 1500 to 1700 hours MDT From Existing System VI. GENERATION HYDRO THERMAL RENEWABLE 3 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 -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) Heavy 2300 73% Northwest to California/Nevada COI (Path 66) Heavy 4800 100% PDCI (Path 65) Heavy 2000 65% 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 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) Moderate 3000/5800 32%/57% Intermountain to Adelanto DC (Path 27) Heavy 1660 69% San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) Heavy 4000 100% 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 13

2017 LIGHT SUMMER 17LS1-OP CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: June 10, 2016 To Staff: July 15, 2016 II. PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS DURING LIGHT LOAD PERIODS. MODERATE FLOWS FROM THE NORTHWEST TO CALIFORNIA AND MODERATE TO HEAVY FLOWS FROM IDAHO/MONTANA TO THE NORTHWEST. III. ITEMS TO BE PREPARED: From Case 16LS1-Operating Case Stability Data Master Dynamics File 1 Significant Changes From Existing System IV. LOADS 2 : Expected minimum load for the months of June - August V. TIME: 0400 to 0600 hours MDT VI. GENERATION HYDRO THERMAL RENEWABLE 3 Canada Median -- -- Northwest Median -- -- Idaho/Montana Median High -- Colorado/Wyoming Median Median -- Northern California Hydro Median -- -- Northern California -- High -- Southern California -- -- -- Arizona/New Mexico/Southern Nevada -- -- -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate 2000 63% Northwest to California/Nevada COI (Path 66) Moderate 3600 75% PDCI (Path 65) Moderate 2000 65% Midway Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) Moderate 1600 67% Montana to Northwest (Path 8) Maximum 2200 100% Utah/Colorado to Southwest -- -- -- (Path 31, 35, 78 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) Moderate 4600/5900 49%/55% Intermountain to Adelanto DC (Path 27) Heavy 1850 77% San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) Light 1500 50% 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 15

2017 LIGHT SPRING 17LSP2-S CASE DESCRIPTION VIII. CASE DUE DATES: To Area Coordinator: July 22, 2016 To Staff: August 26, 2016 IX. PURPOSE: SCENARIO CASE HEAVY SUMMER LOADS THROUGHOUT WECC REGION TO CAPTURE HIGH IMPORTS TO SOUTHERN X. ITEMS TO BE PREPARED: From Case 16HSP1-OP Stability Data Master Dynamics File 1 XI. XII. Significant Changes From Existing System LOADS 2 : 45% of summer peak conditions to represent the months of March April in the Desert Southwest TIME: Afternoon hours (1800 to 2000 hours MDT) XIII. GENERATION HYDRO THERMAL RENEWABLE 3 Canada -- -- -- Northwest -- -- -- Idaho/Montana -- -- -- Colorado/Wyoming -- -- -- Northern California Hydro -- -- -- Northern California -- -- -- Southern California -- -- -- Arizona/New Mexico/Southern Nevada -- -- -- XIV. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) -- -1400 5 -- Northwest to California/Nevada COI (Path 66) -- -- -- PDCI (Path 65) -- -- -- Midway Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) -- -- -- Montana to Northwest (Path 8) -- -- -- Utah/Colorado to Southwest -- -- -- (Path 31, 35, 78 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) -- -- -- Intermountain to Adelanto DC (Path 27) -- -- -- San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) -- -- -- 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 5 Minimum flows are required to represent the Canadian Entitlement. 17

2018 LIGHT AUTUMN 18LA1-S CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: August 26, 2016 To Staff: September 30, 2016 II. PURPOSE: SCENARIO CASE TO ACHIEVE MAXIMUM TRANSFERS OUT OF IDAHO AND MONTANA INTO THE NORTHWEST III. ITEMS TO BE PREPARED: From Case 17LSP1-S Stability Data Master Dynamics File 1 IV. Significant Changes From Existing System LOADS 2 : Minimum load in Idaho and Montana for the months of September - November V. TIME: 0200 to 0400 hours MST VI. GENERATION HYDRO THERMAL RENEWABLE 3 Canada Median Low 50% Avail. Wind Northwest Low High 50% Avail. Wind Idaho/Montana Median Maximum 75% Avail. Wind Colorado/Wyoming -- - 75% Avail. Wind Northern California Hydro Median -- -- Northern California Low - -- Southern California Median Median -- Arizona/New Mexico/Southern Nevada Median Median -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) High -1400 5 75%Northwest to California/Nevada COI (Path 66) Moderate 3200 66% PDCI (Path 65) -- -- -- Midway Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) High 2000 83% Montana to Northwest (Path 8) High 2100 95%Utah/Colorado to Southwest -- -- -- (Path 31, 35, 78 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) -- -- -- San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) -- -- -- 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 5 Minimum flows are required to represent the Canadian Entitlement. 19

2026-27 HEAVY WINTER 27HW1 CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: September 30, 2016 To Staff: November 04, 2016 II. PURPOSE: GENERAL 10-YEAR CASE WITH TYPICAL FLOWS THROUGHOUT WECC. III. ITEMS TO BE PREPARED: From Case 2025-26HW1 Stability Data Master Dynamics File 1 IV. Significant Changes LOADS 2 : Expected peak load for the months of December - February V. TIME: 1800 to 2000 hours MST From Existing System VI. GENERATION HYDRO THERMAL RENEWABLE 3 Canada High -- -- Northwest High High -- Idaho/Montana Median High -- Colorado/Wyoming Low High -- Northern California Hydro Median -- -- Northern California Low Median -- Southern California Low Median -- Arizona/New Mexico/Southern Nevada Low Median -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate -1400 5 46% Northwest to California/Nevada COI (Path 66) -- -- -- PDCI (Path 65) -- -- -- Midway Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) -- -- -- Montana to Northwest (Path 8) -- -- -- Utah/Colorado to Southwest -- -- -- (Path 31, 35, 78 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) -- -- -- San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) -- -- -- 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 5 Minimum flows are required to represent the Canadian Entitlement. 21

2027 HEAVY SUMMER 27HS1 CASE DESCRIPTION I. CASE DUE DATES: To Area Coordinator: November 04, 2016 To Staff: December 09, 2016 II. PURPOSE: GENERAL 10-YEAR CASE WITH TYPICAL FLOWS THROUGHOUT WECC. III. ITEMS TO BE PREPARED: From Case 2026HS1 Stability Data Master Dynamics File 1 IV. Significant Changes LOADS 2 : Expected peak load for the months of June - August V. TIME: 1500 to 1700 hours MDT From Existing System VI. GENERATION HYDRO THERMAL RENEWABLE 3 Canada High -- -- Northwest Median 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 -- VII. INTERCHANGE 4 CONDITION TARGET % RATING Canada to Northwest (Path 3) High >2000 66% Northwest to California/Nevada COI (Path 66) -- -- -- PDCI (Path 65) -- -- -- Midway Los Banos S-N (Path 15) -- -- -- Idaho to Northwest (Path 14) -- -- -- Montana to Northwest (Path 8) -- -- -- Utah/Colorado to Southwest -- -- -- (Path 31, 35, 78 & Durango Coyote 115 kv) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) -- -- -- San Diego to CFE (Path 45) -- -- -- Midway to Vincent (Path 26) -- -- -- 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. 1 Only Corrections to the MDF or new data for the MDF need be submitted. 2 All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 3 Renewables should be based on individual entities Renewable Portfolio Standard. 4 Targets may be altered as anticipated operating conditions become more clearly known. 23

WECC BASE CASES LISTED BY YEAR OF COMPILATION (i.e. 16 = 2016 COMPILED BASE CASE) Winter Cases Identified by the second year of case (e.g. 17 for 16-17 HW1) WINTER SPRING SUMMER AUTUMN Year Light Heavy Light Heavy Light Heavy Light Heavy 2011 10OP 05, 10OP 07S 10OP 10OP 06, 10OP 2012 05S, 11OP 11OP 11OP 11OP 02, 07G, 10S, 11OP 2013 08S, 12OP 07, 12OP 12OP 12OP 08G, 12OP 2014 13OP 08G, 13OP 13OP 13OP 03, 07S, 09S, 13OP 2015 13S, 14OP 04, 09G, 14OP 2016 15OP 08S, 10G, 15OP 2017 11S, 16OP 06, 11G, 16OP 14OP 14OP 06S, 09G, 12S, 14OP 12S 15OP 15OP 05, 10G, 15OP 14S, 16S 16OP 16OP 11G, 16OP 2018 10S, 12G 09S 07G, 12G, 15S 2019 08G, 13G 08G, 13G 09S 10S 16S 05 11S 2020 14G 09G, 14G 2021 15G 10G, 15G 2022 11G, 16G 12S 11S 16G 2023 12G 2024 13G 13S 2025 14G 14G 2026 15G 15G 2027 16G 16G S - Scenario Case (2) G - General/Planning Case (4) OP - Operating/OTC Case (5) V - Validation Case (placeholder) Current Compilation Schedule Proposed Cases * Planning Region Case 24