2015 Base Case Compilation Schedule1

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 2017Base Case Compilation Schedule provides base case descriptions and schedule for base cases to be compiled during the 2017calendar year.

Objectives

The objectives of the 2017Base Case Compilation Schedule are:

  1. Provide a detailed schedule, to appropriate stakeholders, identifying necessary data submittals and data review milestones to compile eleven bases cases.
  2. Identify bases cases to be compiled.A typical annual base case compilation schedule includes the following base cases:
  3. Five operating cases
  4. Three scenario cases
  5. One five-year summer planning case
  6. One five-year winter planning case
  7. One 10-year planning case (alternate winter and summer)

Supporting Information

Timely submittal of steady state and dynamics data is necessary forthe 2017Base 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 WECCData 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 2017 Base Case Compilation Schedule includes the following base cases:

  • Typical base cases
  • Operating base cases
  • 2017-18Heavy Winter
  • 2017-18Light Winter
  • 2018Heavy Spring
  • 2018Heavy Summer
  • 2018Light Summer
  • Five-year base cases
  • 2023Heavy Summer
  • 2022-23Heavy Winter
  • Ten-year base cases
  • 2027-28Heavy Winter
  • 2028Heavy Summer
  • Scenario base cases
  • 2028 Light Spring
  • 2021 Light Spring
  • 2019-20 Heavy Winter with South-North flows through California

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 WECCData 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.

Western Electricity Coordinating Council

2017Base Case Compilation Schedule

CASE[1] / DATE DATA
REQUEST
MAILED / DATE DATA
DUE TO
SUB COORD
/ DATE DATA
DUE TO
AREA COORD / DATE DATA
DUE TO
STAFF / STAFF SEND CASE FOR REVIEW / DATE COMMENTS DUE TO SUB COORD / DATE COMMENTS
DUE TO
AREA COORD / DATE AREA COORDINATOR COMMENTS
DUE TO STAFF / STAFF
FINALIZE
DATE
2017LSP2-S / 07/01/16 / 07/15/16 / 07/22/16 / 08/26/16 / 09/09/16 / 09/16/16 / 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 / 10/21/16 / 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 / 11/23/2016 / 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 / 12/28/2016 / 12/30/16 / 01/06/17 / 01/20/17
CASE / 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
2017-18 HW3-OP / 11/18/16 / 12/16/16 / 01/13/17 / 02/10/17 / 02/24/17 / 03/03/17 / 03/17/17
2017-18 LW2-OP
2018 HSP2-OP / 01/13/17 / 02/10/17 / 03/10/17 / 03/24/17 / 04/07/17 / 04/14/17 / 04/28/17
2022-23 HW2 / 02/24/17 / 03/24/17 / 04/21/17 / 05/19/17 / 06/02/17 / 06/09/17 / 06/23/17
2023 HS1
2018 HS4-OP / 04/21/17 / 05/19/17 / 06/16/17 / 07/14/17 / 07/28/17 / 08/04/17 / 09/01/17
2018 LS1-OP
2021 LSP1-S / 07/21/17 / 08/18/17 / 09/15/17 / 09/29/2017 / 10/13/2017 / 10/20/2017 / 11/03/2017
2027-28 HW1 / 08/04/17 / 09/01/17 / 09/29/17 / 10/27/17 / 11/10/17 / 11/17/17 / 12/01/17
2028 HS1
2028 LSP1-S3 / 09/08/17 / 10/6/17 / 11/3/17 / N/A / N/A / N/A / N/A
2019-20 HW1-S / 10/06/17 / 11/03/17 / 12/01/17 / 12/15/17 / 12/29/17 / 01/05/18 / 01/19/18

3 This case will consist of only the first round of data collection and will not have a final review. Data should be submitted through normal practices and consistent with the case description sheet. WECC will compile into a case for WestConnect.

1

2017-2018HEAVY WINTER – 18HW3-OPCASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:December 23, 2016
    To WECC Staff:January 13, 2017
  2. PURPOSE:OPERATING CASE – TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HEAVY FLOWS FROM NORTHWEST TO CALIFORNIA.
  3. ITEMS TO BE PREPARED:From Case2016-17HW3 Operating Case
    Stability DataMaster Dynamics File[3]
    Significant ChangesFrom Existing System
  4. LOADS[4]:Expected peak load for the months of December - February
  5. TIME:1800 – 2000 hours MST
  6. GENERATIONHYDROTHERMALRENEWABLE[5]

CanadaHigh/Median----
NorthwestHigh/MedianHigh--
Idaho/MontanaMedianHigh--
Colorado/WyomingLowHigh--
Northern California HydroMedian----
Northern CaliforniaLowHigh--
Southern CaliforniaLowHigh--
Arizona/New Mexico/Southern NevadaLowHigh--

  1. INTERCHANGE[6]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Moderate-1400[7]46%
Northwest to California/Nevada
COI (Path 66)Moderate200042%
PDCI (Path 65)Heavy150075[8]%
Midway – Los Banos S-N (Path 15)------
Idaho to Northwest (Path 14)------
Montana to Northwest (Path 8)Moderate140064%
Utah/Colorado to Southwest------
(Path 31, 35, 78 & Durango – Coyote 115 kV)

Southwest to Calif. (EOR Path 49/WOR Path 46)Moderate4000/500043%/47%
Intermountain to Adelanto DC (Path 27)Heavy185096%
San Diego to CFE (Path 45)------
Midway to Vincent (Path 26)Heavy280070%

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.

2017-2018LIGHT WINTER – 18LW1-OPCASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:December 23, 2016
    To WECC Staff:January 13, 2017
  1. PURPOSE:OPERATING CASE – TO REPRESENT ANTICIPATED OPERATING CONDITIONS DURING LIGHT LOAD PERIODS.
  2. ITEMS TO BE PREPARED:From Case2016-17HW3 Operating Case
    Stability DataMaster Dynamics File[9]
    Significant ChangesFrom Existing System
  3. LOADS[10]:Expected minimum load for the months of December - February
  4. TIME: Early morning (0300 to 0500 hours MST), winter conditions.
  5. GENERATIONHYDROTHERMALRENEWABLE[11]

CanadaMedian/Low----
NorthwestLowMedian/Low--
Idaho/MontanaMedianMedian--
Colorado/WyomingLowMedian--
Northern California HydroMedian----
Northern CaliforniaLowMedian--
Southern California--Median--
Arizona/New Mexico/Southern Nevada--Median--

  1. INTERCHANGE[12]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Low-1400[13]46%
Northwest to California/Nevada
COI (Path 66)Moderate0<-50014%
PDCI (Path 65)Moderate0<-50025[14]%
Midway – Los Banos S-N (Path 15)Heavy345064%
Idaho to Northwest (Path 14)Heavy>100042%
Montana to Northwest (Path 8)Heavy200091%
Utah/Colorado to Southwest------
(Path 31, 35, 78 Durango – Coyote 115 kV)

Southwest to Calif. (EOR Path 49/WOR Path 46)Moderate5100/690054%/65%
Intermountain to Adelanto DC (Path 27)Heavy185077%
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.

2018HEAVY SPRING – 18HSP2-OPCASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:February 03, 2017
    To WECC Staff:March 10, 2017
  1. PURPOSE:OPERATING CASE – TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HIGH FLOWS FROM NORTHWEST TO CALIFORNIA.
  2. ITEMS TO BE PREPARED:From Case17HSP1 Operating Case
    Stability DataMaster Dynamics File[15]
    Significant ChangesFrom Existing System
  3. LOADS[16]:Expected peak load for the months of March - May
  4. TIME: 1600 to 2000 hours MDT.
  5. GENERATIONHYDROTHERMALRENEWABLE[17]

CanadaMedian----
NorthwestHighLow--
Idaho/MontanaHighMedian--
Colorado/WyomingMedianMedian--
Northern California HydroMedian----
Northern CaliforniaHighLow--
Southern California------
Arizona/New Mexico/Southern NevadaMedianMedian--

  1. INTERCHANGE[18]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Moderate-1400[19]46%
Northwest to California/Nevada
COI (Path 66)Maximum4800100%
PDCI (Path 65)Maximum200062%
Midway – Los Banos S-N (Path 15)------
Idaho to Northwest (Path 14)Low-40017%
Montana to Northwest (Path 8)Moderate150068%
Utah/Colorado to Southwest------
(Path 31, 35, 78 Durango – Coyote 115 kV)

Southwest to Calif. (EOR Path 49/WOR Path 46)Low3600/450038%/43%
Intermountain to Adelanto DC (Path 27)Heavy185077%
San Diego to CFE (Path 45)------
Midway to Vincent (Path 26)Heavy280093%

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.

2022-2023HEAVY WINTER – 23HW1CASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:March31, 2017
    To WECC Staff:April 21, 2017
  1. PURPOSE:GENERAL 5-YEAR CASE - WITH TYPICAL FLOWS THROUGHOUT WECC.
  2. ITEMS TO BE PREPARED:From Case2021-22HW2
    Stability DataMaster Dynamics File[20]
    Significant ChangesFrom Existing System
  3. LOADS[21]:Expected peak load for the months of December - February
  4. TIME:1800 – 2000 hours MST
  5. GENERATIONHYDROTHERMALRENEWABLE[22]

CanadaHigh----
NorthwestHighHigh--
Idaho/MontanaMedianHigh--
Colorado/WyomingLowHigh--
Northern California HydroMedian----
Northern CaliforniaLowMedian--
Southern CaliforniaLowMedian--
Arizona/New Mexico/Southern NevadaLowMedian--

  1. INTERCHANGE[23]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Moderate-1400[24]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)------

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.

2023HEAVY SUMMER– 23HS2CASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:March 31, 2017
    To WECC Staff:April 21, 2017
  1. PURPOSE:GENERAL 5-YEAR CASE – WITH TYPICAL FLOWS THROUGHOUT WECC.
  2. ITEMS TO BE PREPARED:From Case2021-22 HW2
    Stability DataMaster Dynamics File[25]
    Significant ChangesFrom Existing System
  3. LOADS[26]:Expected peak load for the months of June - August
  4. TIME:1500 to 1700 hours MDT
  5. GENERATIONHYDROTHERMALRENEWABLE[27]

CanadaHigh----
NorthwestMedianHigh--
Idaho/MontanaMedianHigh--
Colorado/WyomingLowHigh--
Northern California HydroHigh----
Northern CaliforniaHighHigh--
Southern CaliforniaLowHigh--
Arizona/New Mexico/Southern NevadaLowHigh--

  1. INTERCHANGE[28]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)High>200066%
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.

2018HEAVY SUMMER– 18HS4-OPCASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:June 9, 2017
    To WECC Staff:June30, 2017
  1. PURPOSE:OPERATING CASE – TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HEAVY FLOWS TO CALIFORNIA FROM THE NORTHWEST AND MODERATE FLOWS ELSEWHERE.
  2. ITEMS TO BE PREPARED:From Case17HS2-Operating Case
    Stability DataMaster Dynamics File[29]
    Significant ChangesFrom Existing System
  3. LOADS[30]:Expected peak load for the months of June - August
  4. TIME: Peak time 1500 to 1700 hours MDT
  5. GENERATIONHYDROTHERMALRENEWABLE[31]

CanadaHigh----
NorthwestMedian/HighHigh--
Idaho/MontanaMedianHigh--
Colorado/WyomingLowHigh--
Northern California HydroHigh----
Northern CaliforniaHighHigh--
Southern CaliforniaLowHigh--
Arizona/New Mexico/Southern NevadaLowHigh--

  1. INTERCHANGE[32]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Heavy230073%
Northwest to California/Nevada
COI (Path 66)Heavy4800100%
PDCI (Path 65)Heavy200065%
Midway – Los Banos S-N (Path 15)------
Idaho to Northwest (Path 14)Light----
Montana to Northwest (Path 8)Moderate120055%
Utah/Colorado to Southwest------
(Path 31, 35, 78 Durango – Coyote 115 kV)

Southwest to Calif. (EOR Path 49/WOR Path 46)Moderate3000/580032%/57%
Intermountain to Adelanto DC (Path 27)Heavy166069%
San Diego to CFE (Path 45)------
Midway to Vincent (Path 26)Heavy4000100%

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.

2018LIGHT SUMMER– 18LS1-OPCASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:June 9, 2017
    To WECC Staff:June 30, 2017
  1. 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.
  2. ITEMS TO BE PREPARED:From Case17HS2-Operating Case
    Stability DataMaster Dynamics File[33]
    Significant ChangesFrom Existing System
  3. LOADS[34]:Expected minimum load for the months of June - August
  4. TIME:0400 to 0600 hours MDT
  5. GENERATIONHYDROTHERMALRENEWABLE[35]

CanadaMedian----
NorthwestMedian----
Idaho/MontanaMedianHigh--
Colorado/WyomingMedianMedian--
Northern California HydroMedian----
Northern California--High--
Southern California------
Arizona/New Mexico/Southern Nevada------

  1. INTERCHANGE[36]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Moderate200063%
Northwest to California/Nevada
COI (Path 66)Moderate360075%
PDCI (Path 65)Moderate200065%
Midway – Los Banos S-N (Path 15)------
Idaho to Northwest (Path 14)Moderate160067%
Montana to Northwest (Path 8)Maximum2200100%
Utah/Colorado to Southwest------
(Path 31, 35, 78 Durango – Coyote 115 kV)

Southwest to Calif. (EOR Path 49/WOR Path 46)Moderate4600/590049%/55%
Intermountain to Adelanto DC (Path 27)Heavy185077%
San Diego to CFE (Path 45)------
Midway to Vincent (Path 26)Light150050%

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.

2021LIGHT SPRING– 21LSP1-SCASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:August11, 2017
    To WECC Staff:September 15, 2017
  1. PURPOSE: Prepare an out-year lightly loaded case for future use in the TPL assessment.
  2. ITEMS TO BE PREPARED:From Case2017LSP2-S
    Stability DataMaster Dynamics File[37]
    Significant ChangesFrom Existing System
  3. LOADS[38]:40% of expected peak load for the months of March - May
  4. TIME:0300 hours MDT
  5. GENERATIONHYDROTHERMALRENEWABLE[39]

Canada------
Northwest------
Idaho/Montana------
Colorado/Wyoming------
Northern California Hydro------
Northern California------
Southern California------
Arizona/New Mexico/Southern Nevada------

  1. INTERCHANGE[40]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)------
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.

2027-28 HEAVY WINTER– 28HW1CASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:September 08, 2017
    To WECC Staff:September 29, 2017
  2. PURPOSE:GENERAL 10-YEAR CASE – WITH TYPICAL FLOWS THROUGHOUT WECC.
  3. ITEMS TO BE PREPARED:From Case2026-27HW1
    Stability DataMaster Dynamics File[41]
    Significant ChangesFrom Existing System
  4. LOADS[42]: Expected peak load for the months of December - February
  5. TIME: 1800 to 2000 hours MST
  6. GENERATIONHYDROTHERMALRENEWABLE[43]

CanadaHigh----
NorthwestHighHigh--
Idaho/MontanaMedianHigh--
Colorado/WyomingLowHigh--
Northern California HydroMedian----
Northern CaliforniaLowMedian--
Southern CaliforniaLowMedian--
Arizona/New Mexico/Southern NevadaLowMedian--

  1. INTERCHANGE[44]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Moderate-1400[45]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)------

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.

2028 HEAVY SUMMER– 28HS1CASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:September08, 2017
    To WECC Staff:September29, 2017
  1. PURPOSE:GENERAL 10-YEAR CASE – WITH TYPICAL FLOWS THROUGHOUT WECC. RESOURCE AND TRANSMISSION REPRESENTATION COORDINATED WITH DATA FROM THE MOST RECENT REGIONAL PLANS OF THE REGIONAL PLANNING GROUPS.
  2. ITEMS TO BE PREPARED:From Case2026 Western Planning Regions Seed Case
    Stability DataMaster Dynamics File[46]
    Significant ChangesFrom Existing System
  3. LOADS[47]:Coordinated with loads in the regional plans of the regional planning regions.Expected peak load for the months of June - August
  4. TIME: 1500 to 1700 hours MDT
  5. GENERATIONHYDROTHERMALRENEWABLE[48]

CanadaHigh----
NorthwestMedianHigh--
Idaho/MontanaMedianHigh--
Colorado/WyomingLowHigh--
Northern California HydroHigh----
Northern CaliforniaHighHigh--
Southern CaliforniaLowHigh--
Arizona/New Mexico/Southern NevadaLowHigh--

  1. INTERCHANGE[49]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)High>200066%
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.

2028 LIGHT SPRING – 28LSP1-SCASE DESCRIPTION

  1. CASE DUE DATES:To Data Submitter:October 6, 2017
    To WECC Staff:November 3, 2017
  2. PURPOSE: Model light-load conditions with solar and wind serving a significant but realistic portion of the WECC total load. The case shouldonly 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.
  3. ITEMS TO BE PREPARED:From Case2026 LSP1-S, or WC26-LSP[50]
    Stability DataMaster Dynamics File[51]
    Significant ChangesFrom Existing System
  4. LOADS[52]:Target 60-65% of peak summer loads that would occur during the spring months of March, April, and May.
  1. 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.
  1. GENERATIONHYDROTHERMALRENEWABLE[53]

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.