WECC Guideline 2019 Base Case Compilation Schedule Date: January 16, 2018

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1 WECC Guideline 2019 Base Case Compilation Schedule Date: January 16, 2018 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 2019 Base Case Compilation Schedule provides base case descriptions and a schedule for base cases to be compiled during the 2019 calendar year. Objectives The objectives of the 2019 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 specialized 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 2019 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. Specialized 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 specialized case actually occurring. WESTERN ELECTRICITY COORDINATING COUNCIL 155 North 400 West, Suite 200 Salt Lake City, Utah

2 2018 Base Case Compilation Schedule 2 The 2019 Base Case Compilation Schedule uses one of the specialized case slots for the NERC required Light Spring Operations case. Since a Light Spring Operations case is now a NERC requirement, it is likely that the DS will approve the Light Spring Operations case to replace the Heavy Spring Operations case in the Base Case Compilation Schedule moving forward. If this occurs, when less than two specialized cases are DS approved for a given schedule, a Heavy Spring case will be automatically added to a Specialized slot. The 2019 Base Case Compilation Schedule includes the following base cases: Typical base cases o Operating base cases Heavy Winter Light Winter 2020 Heavy Spring 2020 Heavy Summer 2020 Light Summer o Five-year base cases 2025 Heavy Summer Heavy Winter o Ten-year base cases Heavy Winter 2030 Heavy Summer Specialized base case o 2030 Light Spring with mid-day load and high renewable generation o 2020 Light Spring-NERC required Light Spring Operating case 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 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 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. 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 LSP1-S 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 05/25/18 06/22/18 07/20/18 08/17/18 08/24/18 08/31/18 09/14/ HW1 07/06/18 08/03/18 08/31/18 09/28/ /05/ /19/ /2/ HS HSP1-S 10/05/18 11/02/18 11/30/18 12/28/18 1/04/19 1/11/19 02/25/19 CASE HW3-OP LW1-OP 2020 HSP1-OP 2020 LSP1-S 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 11/16/18 12/14/18 01/11/19 02/8/19 02/22/19 03/08/19 03/22/19 01/4/19 02/1/19 03/1/19 03/29/19 04/12/19 04/26/19 05/10/ 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 HS2 02/22/19 03/22/19 04/19/19 05/17/19 05/31/19 06/14/19 06/28/ HS3-OP 2020 LS1-OP HW1 04/12/19 05/10/19 06/07/19 07/05/19 07/19/ /19 08/16/ HS1 5/31/19 06/28/19 07/26/19 08/23/ /06/ /20/ /04/ LSP1-S 07/19/19 08/16/19 09/13/19 10/11/19 10/18/19 10/25/19 11/08/19 5

6 HEAVY WINTER 20 HW3-OP I. CASE DUE DATES: To Data Submitter: December 14, 2018 To WECC Staff: January 11, 2019 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 IV. LOADS: Expected peak load for the months of December - February V. TIME: hours MST VI. GENERATION HYDRO THERMAL RENEWABLE 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 Northwest to British Columbia (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 % San Diego to CFE (Path 45) % Northern to Southern California (Path 26) Heavy % 1 Minimum flows are required to represent the Canadian Entitlement. 6

7 LIGHT WINTER 20LW1-OP I. CASE DUE DATES: To Data Submitter: December 14, 2018 To WECC Staff: January 11, 2019 PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS DURING LIGHT LOAD PERIODS. I ITEMS TO BE PREPARED: From Case HW3 Operating Case IV. LOADS: Expected minimum load for the months of December - February V. TIME: Early morning (0300 to 0500 hours MST), winter conditions. VI. GENERATION HYDRO THERMAL RENEWABLE 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 Northwest to British Columbia (Path 3) Moderate % COI (Path 66) Low 0/ % PDCI (Path 65) Low 0/ % Midway Los Banos S-N (Path 15) Moderate % 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) Moderate % San Diego to CFE (Path 45) Low 60 15% Northern to Southern California (Path 26) Low % (S-N) 1 Minimum flows are required to represent the Canadian Entitlement. 7

8 2020 HEAVY SPRING 20HSP1-OP I. CASE DUE DATES: To Data Submitter: February 1, 2019 To WECC Staff: March 1, 2019 PURPOSE: OPERATING CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HIGH FLOWS FROM NORTHWEST TO CALIFORNIA. I ITEMS TO BE PREPARED: From Case 19 HSP1P Operating Case IV. LOADS: Expected peak load for the months of March - May V. TIME: 1600 to 2000 hours MDT. VI. GENERATION HYDRO THERMAL RENEWABLE 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 Northwest to British Columbia (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 % San Diego to CFE (Path 45) Low 60 15% Northern to Southern California (Path 26) Heavy % 1 Minimum flows are required to represent the Canadian Entitlement. 8

9 2020 LIGHT SPRING 20LSP1-S I. CASE DUE DATES: To Data Submitter: February 1, 2019 To WECC Staff: March 1, 2019 I PURPOSE: SPECIALIZED CASE TO REPRESENT ANTICIPATED OPERATING CONDITIONS DURING LIGHT LOAD PERIODS. IV. ITEMS TO BE PREPARED: From Case 19 HSP1 Operating Case V. LOADS: Expected minimum load for the months of March-May VI. TIME: 0300 to 0500 MDT V GENERATION HYDRO THERMAL RENEWABLE Canada -- Northwest -- Idaho/Montana -- Colorado/Wyoming -- Northern California Hydro -- Northern California -- Southern California -- Arizona/New Mexico/Southern Nevada -- VI INTERCHANGE CONDITION TARGET % RATING Northwest to British Columbia (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) San Diego to CFE (Path 45) Northern to Southern California (Path 26) *RMR Reliability Must Run 1 Minimum flows are required to represent the Canadian Entitlement. 9

10 HEAVY WINTER 25HW2 I. CASE DUE DATES: To Data Submitter: March 22, 2019 To WECC Staff: April 19, 2019 PURPOSE: GENERAL 5-YEAR CASE - WITH TYPICAL FLOWS THROUGHOUT WECC. I ITEMS TO BE PREPARED: From Case HW2 IV. LOADS: Expected peak load for the months of December - February V. TIME: hours MST VI. GENERATION HYDRO THERMAL RENEWABLE 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 Northwest to British Columbia (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) San Diego to CFE (Path 45) Northern to Southern California (Path 26) Minimum flows are required to represent the Canadian Entitlement. 10

11 2025 HEAVY SUMMER 25HS2 I. CASE DUE DATES: To Data Submitter: March 22, 2019 To WECC Staff: April 19, 2019 PURPOSE: GENERAL 5-YEAR CASE WITH TYPICAL FLOWS THROUGHOUT WECC. I ITEMS TO BE PREPARED: From Case HW2 IV. LOADS: Expected peak load for the months of June - August V. TIME: 1500 to 1700 hours MDT VI. GENERATION HYDRO THERMAL RENEWABLE 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 Northwest to British Columbia (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) San Diego to CFE (Path 45) Northern to Southern California (Path 26)

12 2020 HEAVY SUMMER 20HS3-OP I. CASE DUE DATES: To Data Submitter: May 10, 2019 To WECC Staff: June 7, 2019 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 19 HS3-Operating Case IV. LOADS: Expected peak load for the months of June - August V. TIME: Peak time 1500 to 1700 hours MDT VI. GENERATION HYDRO THERMAL RENEWABLE 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 Northwest to British Columbia (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) Heavy % San Diego to CFE (Path 45) Low % Northern to Southern California (Path 26) Heavy % 12

13 2020 LIGHT SUMMER 20LS1-OP I. CASE DUE DATES: To Data Submitter: May 10, 2019 To WECC Staff: June 7, 2019 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 19 HS3-Operating Case IV. LOADS: Expected minimum load for the months of June - August V. TIME: 0400 to 0600 hours MDT VI. GENERATION HYDRO THERMAL RENEWABLE 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 Northwest to British Columbia (Path 3) Moderate % COI (Path 66) Heavy % PDCI (Path 65) Moderate % Idaho to Northwest (Path 14) Low % Montana to Northwest (Path 8) Maximum % Southwest to Calif. (EOR Path 49/WOR Path 46) Moderate 4600/ %/55% Intermountain to Adelanto DC (Path 27) Moderate % San Diego to CFE (Path 45) Northern to Southern California (Path 26) Moderate % 13

14 HEAVY WINTER 30HW1 I. CASE DUE DATES: To Data Submitter: June 28, 2019 To WECC Staff: July 26, 2019 I PURPOSE: GENERAL 10-YEAR CASE WITH TYPICAL FLOWS THROUGHOUT WECC. RESOURCE AND TRANSMISSION REPRESENTATION COORDINATED WITH THE REGIONAL PLANNING GROUPS (RPGs) IN WHOSE FOOTPRINT YOUR ENTITY FALLS. IV. ITEMS TO BE PREPARED: From Case HW1 V. LOADS: Expected peak load for the months of December - February VI. V TIME: 1800 to 2000 hours MST GENERATION: Ensure that your entity s resource planner is consulted concerning the resources being represented in this power flow base case. VI HYDRO THERMAL RENEWABLE 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 -- IX. INTERCHANGE CONDITION TARGET % RATING Northwest to British Columbia (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) San Diego to CFE (Path 45) Northern to Southern California (Path 26) Minimum flows are required to represent the Canadian Entitlement. 14

15 2030 HEAVY SUMMER 30HS1 I. CASE DUE DATES: To Data Submitter: June 28, 2019 To WECC Staff: July 26, 2019 I PURPOSE: GENERAL 10-YEAR CASE WITH TYPICAL FLOWS THROUGHOUT WECC. RESOURCE AND TRANSMISSION REPRESENTATION COORDINATED WITH THE REGIONAL PLANNING GROUPS (RPGs) IN WHOSE FOOTPRINT YOUR ENTITY FALLS. IV. ITEMS TO BE PREPARED: From Case HW1 V. LOADS: Expected peak load for the months of June - August VI. V TIME: 1500 to 1700 hours MDT GENERATION: Ensure that your entity s resource planner is consulted concerning the resources being represented in this power flow base case. VI HYDRO THERMAL RENEWABLE 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 -- IX. INTERCHANGE CONDITION TARGET % RATING Northwest to British Columbia (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) San Diego to CFE (Path 45) Northern to Southern California (Path 26)

16 2030 LIGHT SPRING 30LSP1-S X. CASE DUE DATES: To Data Submitter: August 16th, 2019 To WECC Staff: September, 2019 I. PURPOSE: Model light-load conditions with solar and wind serving a significant but realistic portion of the WECC total load. The case should only include renewable resource capacity additions that are already planned and included in the 10-year future, and represent likely and expected system conditions consistent with any applicable and enacted public policy requirements. ITEMS TO BE PREPARED: From Case 2028 LSP1 1 I IV. LOADS 2 : Target 60-65% of peak summer loads that would occur during the spring months of March, April, and May. TIME: 1000 to 1400 hours MDT. The time of day has been determined from the data gathered from the latest WECC Production Cost Model. The model uncovered periods of high renewables when loads were approximately 60-65% of WECC peak. The time was chosen to try and capture solar as well as wind generation. V. GENERATION HYDRO THERMAL RENEWABLE 3 Wind and solar generation targets were developed by analysis of the WECC Common Case Production Cost Model, which utilizes historical weather data for its renewable generation profiles. The data was evaluated to find instances of off-peak loading and high renewable generation. Data was filtered to find wind and solar dispatch consistent with the average of the top 10% of generation hours during the chosen time period when loads were between 60-65% of the WECC peak. Target renewable capacity values by powerflow area will be provided. Thermal generation should be adjusted to accommodate the higher renewable dispatch conditions. VI. INTERCHANGE CONDITION TARGET % RATING No Specific Targets 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. 16

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 OP 08G, 13OP 13OP 13OP 03, 07S, 09S, 13OP 09S S, 14OP 04, 09G, 14OP OP 08S, 10G, 15OP S, 16OP 06, 11G, 16OP OP 10S, 12G, 17OP OP 08G, 13G, 18OP OP 14G, 17S, 19OP 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 19OP 19OP 19OP 09G, 14G, 19OP G 17S 10G, 15G 10S 16S 11S G, 16G 12S 11S 16G G 12G, 17G G, 18G 13S, 18G G, 19G 14G, 19G G 15G G 16G G 17G G 18S 18G G 19G 19G S - Scenario Case (2) G - General/Planning Case (4) OP - Operating/OTC Case (5) V - Validation Case (placeholder) Current Compilation Schedule Proposed Cases 17