WECC Guideline 2018 Base Case Compilation Schedule Date: DRAFT

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1 WECC Guideline 2018 Base Case Compilation Schedule Date: DRAFT Introduction The Data Subcommittee compiles eleven steady state and dynamic base cases (base cases) to meet WECC s requirements to compile interconnection-wide base cases. The 2018 Base Case Compilation Schedule provides base case descriptions and a schedule for base cases to be compiled during the 2018 calendar year. Objectives The objectives of the 2018 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. Identify bases cases to be compiled. A typical annual base case compilation schedule includes the following base cases: a. Five operating cases b. Two scenario cases c. One 5-year summer planning case d. One 5-year winter planning case e. One 10-year summer planning case f. One 10-year winter planning case Supporting Information Timely submittal of steady state and dynamics data is necessary for the 2018 Base Case Compilation Schedule to be maintained. In the event of delayed steady state and dynamic data submittals, the Data Subcommittee 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 RAC membership. 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 sub-region. Data submitters should not be reluctant to model a condition due to lack of historical record of the scenario actually occurring. WESTERN ELECTRICITY COORDINATING COUNCIL 155 North 400 West, Suite 200 Salt Lake City, Utah

2 2018 Base Case Compilation Schedule 2 The 2018 Base Case Compilation Schedule includes the following base cases: Typical base cases o Operating base cases Heavy Winter Light Winter 2019 Heavy Spring 2019 Heavy Summer 2019 Light Summer o Five-year base cases 2024 Heavy Summer Heavy Winter o Ten-year base cases Heavy Winter 2029 Heavy Summer Scenario base cases o 2029 Heavy Spring with mid-day load and high renewable generation o 2019 Light Spring with 50-60% of peak load and high renewable generation 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. Renewable generation, when specified, should be based on individual entities Renewable Portfolio Standard. 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. All loads are coincident unless indicated otherwise. Specified time supersedes specified percentage of load. 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. Targets may be altered as anticipated operating conditions become more clearly known. 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 purpose of the case should be kept in mind and schedules should be coordinated between areas prior to data submittal. 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

3 2018 Base Case Compilation Schedule 3 Only corrections to the Master Dynamics File (MDF) or new data for the MDF need be submitted for each case build. 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 Interconnection-wide Model 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

4 2018 Base Case Compilation Schedule CASE 1 DATE DATA REQUEST MAILED DATE DATA DUE TO DATA SUBMITTER DATE DATA DUE TO WECC STAFF WECC STAFF SEND CASE FOR REVIEW DATE COMMENTS DUE TO DATA SUBMITTER DATE DATA SUBMITTER COMMENTS DUE TO WECC STAFF WECC STAFF FINALIZE DATE 2021 LSP1-S 07/21/17 08/18/17 09/15/17 09/29/ /13/ /20/ /03/ HW HS1 08/04/17 09/01/17 09/29/17 10/27/17 11/10/17 11/17/17 12/01/ HW1-S 10/06/17 11/03/17 12/01/17 12/15/17 12/29/17 01/05/18 01/19/18 CASE HW3-OP LW1-OP DATE DATA REQUEST MAILED DATE DATA DUE TO DATA SUBMITTER 2 DATE DATA DUE TO WECC STAFF WECC STAFF SEND CASE FOR REVIEW DATE COMMENTS DUE TO DATA SUBMITTER DATE DATA SUBMITTER COMMENTS DUE TO WECC STAFF WECC STAFF FINALIZE DATE 11/17/17 12/15/17 01/12/18 02/9/18 02/23/18 03/09/18 03/23/ HSP1-OP 01/5/18 02/2/18 03/2/18 03/30/17 04/13/18 04/20/18 05/04/ HW HS HS3-OP 2019 LS1-OP 02/16/18 03/16/18 04/13/18 05/11/18 05/18/18 06/01/18 06/15/18 04/06/18 05/04/18 06/01/18 06/29/18 07/13/18 07/27/18 08/10/ LSP1-S 05/25/18 06/22/18 07/20/18 08/17/18 08/24/18 08/31/18 09/14/ Case Schedule 2 Data provided to the Data Submitter is expected to include topology corrections common to the set of cases being developed, project files for the out year case (if applicable), and a load, generation and voltage profile for each case. 4

5 HW HS1 07/06/18 08/03/18 08/31/18 09/28/ /05/ /19/ /2/ HSP1-S 10/05/18 11/02/18 11/30/18 12/28/18 1/04/19 1/11/19 02/25/19 5

6 HEAVY WINTER 19HW3-OP I. CASE DUE DATES: To Data Submitter: December 15, 2017 To WECC Staff: January 12, 2018 PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HEAVY FLOWS FROM NORTHWEST TO CALIFORNIA. I ITEMS TO BE PREPARED: From Case HW3 Operating Case LOADS: Expected peak load for the months of December - February V. TIME: hours MST 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 -- V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate % COI (Path 66) Moderate % PDCI (Path 65) Heavy % Idaho to Northwest (Path 14) Montana to Northwest (Path 8) Moderate % Southwest to Calif. (EOR Path 49/WOR Path 46) Moderate 4000/ %/47% Intermountain to Adelanto DC (Path 27) Heavy % Midway to Vincent (Path 26) Heavy % 1 Minimum flows are required to represent the Canadian Entitlement. 6

7 LIGHT WINTER 19LW1-OP I. CASE DUE DATES: To Data Submitter: December 15, 2017 To WECC Staff: January 12, 2018 PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS DURING LIGHT LOAD PERIODS. I ITEMS TO BE PREPARED: From Case HW3 Operating Case LOADS: Expected minimum load for the months of December - February V. TIME: Early morning (0300 to 0500 hours MST), winter conditions. 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 -- V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate % COI (Path 66) Low 0/ % PDCI (Path 65) Low 0/ % Midway Los Banos S-N (Path 15) Heavy % Idaho to Northwest (Path 14) Moderate > % Montana to Northwest (Path 8) Heavy % Southwest to Calif. (EOR Path 49/WOR Path 46) Moderate 5100/ %/65% Intermountain to Adelanto DC (Path 27) Heavy % Midway to Vincent (Path 26) Moderate % (S-N) 1 Minimum flows are required to represent the Canadian Entitlement. 7

8 2019 HEAVY SPRING 19HSP1-OP I. CASE DUE DATES: To Data Submitter: February 2, 2018 To WECC Staff: March 2, 2018 PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HIGH FLOWS FROM NORTHWEST TO CALIFORNIA. I ITEMS TO BE PREPARED: From Case 18HSP2 Operating Case LOADS: Expected peak load for the months of March - May V. TIME: 1600 to 2000 hours MDT. 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 -- V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate % COI (Path 66) Maximum % PDCI (Path 65) Moderate % Idaho to Northwest (Path 14) Low % Montana to Northwest (Path 8) Moderate % Southwest to Calif. (EOR Path 49/WOR Path 46) Low 3600/ %/43% Intermountain to Adelanto DC (Path 27) Heavy % Midway to Vincent (Path 26) Heavy % 1 Minimum flows are required to represent the Canadian Entitlement. 8

9 HEAVY WINTER 24HW2 I. CASE DUE DATES: To Data Submitter: March 16, 2018 To WECC Staff: April 13, 2018 PURPOSE: GENERAL 5-YEAR CASE - WITH TYPICAL FLOWS THROUGHOUT WECC. I ITEMS TO BE PREPARED: From Case HW1 LOADS: Expected peak load for the months of December - February V. TIME: hours MST 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 -- V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate % COI (Path 66) PDCI (Path 65) Idaho to Northwest (Path 14) Montana to Northwest (Path 8) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) Midway to Vincent (Path 26) Minimum flows are required to represent the Canadian Entitlement. 9

10 2024 HEAVY SUMMER 24HS2 I. CASE DUE DATES: To Data Submitter: March 16, 2018 To WECC Staff: April 13, 2018 PURPOSE: GENERAL 5-YEAR CASE WITH TYPICAL FLOWS THROUGHOUT WECC. I ITEMS TO BE PREPARED: From Case HW1 LOADS: Expected peak load for the months of June - August V. TIME: 1500 to 1700 hours MDT 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 -- V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate > % COI (Path 66) PDCI (Path 65) Idaho to Northwest (Path 14) Montana to Northwest (Path 8) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) Midway to Vincent (Path 26)

11 2019 HEAVY SUMMER 19HS3-OP I. CASE DUE DATES: To Data Submitter: May 4, 2018 To WECC Staff: June 1, 2018 PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HEAVY FLOWS TO CALIFORNIA FROM THE NORTHWEST AND MODERATE FLOWS ELSEWHERE. I ITEMS TO BE PREPARED: From Case 18HS3-Operating Case LOADS: Expected peak load for the months of June - August V. TIME: Peak time 1500 to 1700 hours MDT 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 -- V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) Heavy % COI (Path 66) Heavy % PDCI (Path 65) Moderate % Idaho to Northwest (Path 14) Light Montana to Northwest (Path 8) Moderate % Southwest to Calif. (EOR Path 49/WOR Path 46) Low/Moderate 3000/ %/57% Intermountain to Adelanto DC (Path 27) Moderate % Midway to Vincent (Path 26) Heavy % 11

12 2019 LIGHT SUMMER 19LS1-OP I. CASE DUE DATES: To Data Submitter: May 4, 2018 To WECC Staff: June 1, 2018 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. I ITEMS TO BE PREPARED: From Case 18HS3-Operating Case LOADS: Expected minimum load for the months of June - August V. TIME: 0400 to 0600 hours MDT 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 V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate % COI (Path 66) Heavy % PDCI (Path 65) Moderate % Idaho to Northwest (Path 14) Moderate % Montana to Northwest (Path 8) Maximum % Southwest to Calif. (EOR Path 49/WOR Path 46) Moderate 4600/ %/55% Intermountain to Adelanto DC (Path 27) Heavy % Midway to Vincent (Path 26) Moderate % 12

13 2019 LIGHT SPRING 19LSP1-S I. CASE DUE DATES: To Data Submitter: November 02, 2018 To WECC Staff: November 30, 2018 PURPOSE: SCENARIO CASE TO REPRESENT A NON-PEAK LOAD PATTERN WITH INCREASED RENEWABLE GENERATION I ITEMS TO BE PREPARED: From Case 2019 HSP1 Operating Case LOADS: Low daytime non-peak load on a Sunday in March or April (50-60% of spring peak) V. TIME: MDT Canada -- Min RMR* 100% Northwest -- Min RMR* 100% Idaho/Montana -- Min RMR* 100% Colorado/Wyoming -- Min RMR* 100% Northern California Hydro -- Min RMR* 100% Northern California -- Min RMR* 100% Southern California -- Min RMR* 100% Arizona/New Mexico/Southern Nevada -- Min RMR* 100% V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) COI (Path 66) PDCI (Path 65) N-S % Idaho to Northwest (Path 14) Montana to Northwest (Path 8) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) Midway to Vincent (Path 26) *RMR Reliability Must Run 13

14 HEAVY WINTER 29HW1 I. CASE DUE DATES: To Data Submitter: August 03, 2018 To WECC Staff: August 31, 2018 PURPOSE: GENERAL 10-YEAR CASE WITH TYPICAL FLOWS THROUGHOUT WECC. I ITEMS TO BE PREPARED: From Case HW1 LOADS: Expected peak load for the months of December - February V. TIME: 1800 to 2000 hours MST 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 -- V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate % COI (Path 66) PDCI (Path 65) Idaho to Northwest (Path 14) Montana to Northwest (Path 8) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) Midway to Vincent (Path 26) Minimum flows are required to represent the Canadian Entitlement. 14

15 2029 HEAVY SUMMER 29HS1 I. CASE DUE DATES: To Data Submitter: September 14, 2018 To WECC Staff: October 12, 2018 PURPOSE: GENERAL 10-YEAR CASE WITH TYPICAL FLOWS THROUGHOUT WECC. I ITEMS TO BE PREPARED: From Case HW1 LOADS: Expected peak load for the months of June - August V. TIME: 1500 to 1700 hours MDT 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 -- V INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) Moderate > % COI (Path 66) PDCI (Path 65) Idaho to Northwest (Path 14) Montana to Northwest (Path 8) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) Midway to Vincent (Path 26)

16 2029 HEAVY SPRING 29HSP1-S VI CASE DUE DATES: To Data Submitter: June 22, 2018 To WECC Staff: July 20, 2018 IX. PURPOSE: PREPARE A CASE WITH HEAVY SPRING MID-DAY LOADS AND HIGH/PEAK RENEWABLE GENERATION FOR YEAR 2029 X. ITEMS TO BE PREPARED: From Case (TBD) XI. X LOADS: expected peak loads for the months of April May TIME: MST XI GENERATION HYDRO THERMAL RENEWABLE Canada High Northwest Medium/High -- Medium/High Idaho/Montana High Colorado/Wyoming High Northern California Hydro Medium/High Northern California High Southern California High Arizona/New Mexico/Southern Nevada High X INTERCHANGE CONDITION TARGET % RATING Canada to Northwest (Path 3) COI (Path 66) PDCI (Path 65) / Midway Los Banos S-N (Path 15) Moderate Idaho to Northwest (Path 14) Montana to Northwest (Path 8) Southwest to Calif. (EOR Path 49/WOR Path 46) -- --/-- --/-- Intermountain to Adelanto DC (Path 27) Midway to Vincent (Path 26)

17 WECC BASE CASES LISTED BY YEAR OF COMPILATION (i.e. 18 = 2018 COMPILED BASE CASE) Winter Cases Identified by the second year of case (e.g. 19 for HW) WINTER SPRING SUMMER AUTUMN Year Light Heavy Light Heavy Light Heavy Light Heavy S, 12OP 07, 12OP 12OP 12OP 08G, 12OP OP 08G, 13OP 13OP 13OP 03, 07S, 09S, 13OP S, 14OP 04, 09G, 14OP OP 08S, 10G, 15OP S, 16OP 06, 11G, 16OP OP 10S, 12G, 17OP OP 08G, 13G, 18OP 14OP 14OP 06S, 09G, 12S, 14OP 12S 15OP 15OP 05, 10G, 15OP 14S, 16S 16OP 16OP 11G, 16OP 09S, 17OP 17OP 07G, 12G, 15S, 17OP 18S 18OP 18OP 08G, 13G, 18OP G, 17S 09G, 14G 09S 10S 16S 11S G 17S 10G, 15G G, 16G 12S 11S 16G G 12G, 17G G, 18G 13S, 18G G 14G G 15G G 16G G 17G G 18S 18G S - Scenario Case (2) G - General/Planning Case (4) OP - Operating/OTC Case (5) V - Validation Case (placeholder) Current Compilation Schedule Proposed Cases 17