2016 Base Case Compilation Schedule-DRAFT - V2 Redline

2015 Base Case Compilation Schedule1

Introduction

The System Review Work Group (SRWG) compiles eleven steady state and dynamic base cases (base cases) to support compliance requirements for Transmission Operator, Transmission Planner, Planning Coordinator and other functional entities and meet WECC’s requirements of MOD-014, MOD-015 and MOD-032.The 2016Base Case Compilation Schedule provides base case descriptions and schedule for base cases to be compiled during the 2016calendar year.

Objectives

The objectives of the 2016Base Case Compilation Schedule are:

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:
Five operating cases
Three scenario cases
One five-year summer planning case
One five-year winter planning case
One 10-year planning case (alternate winter and summer)

III.Promote compliance of Transmission Operators, Transmission Planners, Planning Coordinators, and other functional entities with the following NERC Reliability Standards:

a.MOD-010-0 – Steady-State Data for Transmission System Modeling and Simulation (fully retired 7/1/2016)

b.MOD-012-0 – Dynamics Data for Transmission System Modeling and Simulation (fully retired 7/1/2016)

c.MOD-032-1 – Data for Power System Modeling and Analysis (fully effective 7/1/2016)

d.FAC-008-3 – Facility Ratings

e.PRC-006-1 – Automatic Underfrequency Load Shedding

f.PRC-021-1 – Under-Voltage Load Shedding Program Data

g.TPL-001-4 – Transmission System Planning Performance Requirements

IV.Upon completion of the Base Case Compilation Schedule, fulfill the requirements for WECC as the Reliability Assurer for the following NERC Reliability Standards:

a.MOD-014-0 – Development of Steady State Models (fully retired 7/1/2016)

b.MOD-015-0 – Development of Dynamic Models (fully retired 7/1/2016)

c.MOD-032-1 – Data for Power System Modeling and Analysis (fully effective 7/1/2016)

Supporting Information

Timely submittal of steady state and dynamics data is necessary forthe 2016Base 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 2016 Base Case Compilation Schedule includes the following base cases:

Typical base cases
Operating base cases
2016-17Heavy Winter
2016-17Light Winter
2017Heavy Spring
2017Heavy Summer
2017Light Summer
Five-year base cases
2022Heavy Summer
2021-22Heavy Winter
Ten-year base cases
2026-27Heavy Winter
2027Heavy Summer
Scenario base cases

o20xx Planning Region 10-year Light Load Case

2017Light Springin Desert Southwest
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 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

2016Base 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
2016-17HW3-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
2016-17LW2-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
2017HSP1-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
2021-22HW2 / 02/26/16 / 03/11/16 / 03/18/16 / 04/22/16 / 05/06/16 / 05/13/16 / 05/20/16 / 06/03/16
2022HS1 / 04/01/16 / 04/15/16 / 04/22/16 / 05/27/16 / 06/10/16 / 06/17/16 / 06/24/16 / 07/08/16
2017HS2-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
2017LS1-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
2017LSP2-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-SXX-Regional / 08/05/16 / 08/19/16 / 08/26/16 / 09/30/16 / 10/14/16 / 10/28/16 / 11/04/16 / 11/18/16
2026-27HW1 / 09/09/16 / 09/23/16 / 09/30/16 / 11/04/16 / 11/18/16 / 11/25/16 / 12/02/16 / 12/16/16
2027HS1 / 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

2016-2017HEAVY WINTER – 17HW3-OPCASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:December 11, 2015
To Staff:January 15, 2016
PURPOSE:OPERATING CASE – TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HEAVY FLOWS FROM NORTHWEST TO CALIFORNIA.
ITEMS TO BE PREPARED:From Case2015-16HW3 Operating Case
Stability DataMaster Dynamics File[1]
Significant ChangesFrom Existing System
LOADS[2]:Expected peak load for the months of December - February
TIME:1800 – 2000 hours MST
GENERATIONHYDROTHERMALRENEWABLE[3]

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

INTERCHANGE[4]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Moderate-1400[5]46%
Northwest to California/Nevada
COI/RATS (Path 66)Moderate200042%
PDCI (Path 65)Heavy150075[6]%
Midway – Los Banos S-N (Path 15) S-N------
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%
Path 45 (San Diego to CFE) (Path 45)------
Midway to Vincent (Path 26)Heavy280093%70%

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.

2016-2017LIGHT WINTER – 17LW2-OPCASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:December 25, 2015
To Staff:January29, 2016

PURPOSE:OPERATING CASE – TO REPRESENT ANTICIPATED OPERATING CONDITIONS DURING LIGHT LOAD PERIODS.
ITEMS TO BE PREPARED:From Case2015-16LW2 Operating Case
Stability DataMaster Dynamics File[7]
Significant ChangesFrom Existing System
LOADS[8]:Expected minimum load for the months of December - February
TIME: Early morning (0300 to 0500 hours MST), winter conditions.
GENERATIONHYDROTHERMALRENEWABLE[9]

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

INTERCHANGE[10]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Low-1400[11]46%
Northwest to California/Nevada
COI (Path 66) (COI/RATS)Moderate0<-50014%
PDCI (Path 65)(PDCI)Moderate0<-50025[12]%
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)

Utah/Colorado to Southwest------
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)Path 45 (San Diego to CFE)------
Midway to Vincent (Path 26)------

2017HEAVY SPRING – 17HSP1-OPCASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:February 05, 2016
To Staff:March 11, 2016

PURPOSE:OPERATING CASE – TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HIGH FLOWS FROM NORTHWEST TO CALIFORNIA.
ITEMS TO BE PREPARED:From Case16HSP1 Operating Case
Stability DataMaster Dynamics File[13]
Significant ChangesFrom Existing System
LOADS[14]:Expected peak load for the months of March - May
TIME: 1600 to 2000 hours MDT.
GENERATIONHYDROTHERMALRENEWABLE[15]

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

INTERCHANGE[16]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Moderate-1400[17]46%
Northwest to California/Nevada
COI (Path 66)(COI/RATS)Maximum4800100%
PDCI (Path 65)(PDCI)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)

Utah/Colorado to Southwest------
Southwest to Calif. (EOR Path 49/WOR Path 46)Southwest to Calif. (EOR/WOR)Low3600/4500 38%/43%
Intermountain to Adelanto DC (Path 27)Heavy185077%
San Diego to CFE (Path 45)Path 45 (San Diego to CFE)------
Midway to Vincent (Path 26)Heavy280093%

2021-2022HEAVY WINTER – 22HW2CASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:March18, 2016
To Staff:April 22, 2016

PURPOSE:GENERAL 5-YEAR CASE - WITH TYPICAL FLOWS THROUGHOUT WECC.
ITEMS TO BE PREPARED:From Case2020-21HW1
Stability DataMaster Dynamics File[18]
Significant ChangesFrom Existing System
LOADS[19]:Expected peak load for the months of December - February
TIME:1800 – 2000 hours MST
GENERATIONHYDROTHERMALRENEWABLE[20]

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

INTERCHANGE[21]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Moderate-1400[22]46%
Northwest to California/Nevada
COI (Path 66)(COI/RATS)------
PDCI (Path 65)(PDCI)------
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)

Utah/Colorado to Southwest------
Southwest to Calif. (EOR Path 49/WOR Path 46)Southwest to Calif. (EOR/WOR)----/----/--
Intermountain to Adelanto DC (Path 27)------
San Diego to CFE (Path 45)Path 45 (San Diego to CFE)------
Midway to Vincent (Path 26)------

2022HEAVY SUMMER– 22HS1CASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:April 22, 2016
To Staff:May 27, 2016

PURPOSE:GENERAL 5-YEAR CASE – WITH TYPICAL FLOWS THROUGHOUT WECC.
ITEMS TO BE PREPARED:From Case21HS2
Stability DataMaster Dynamics File[23]
Significant ChangesFrom Existing System
LOADS[24]:Expected peak load for the months of June - August
TIME:1500 to 1700 hours MDT
GENERATIONHYDROTHERMALRENEWABLE[25]

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

INTERCHANGE[26]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)High>200066%
Northwest to California/Nevada
COI (Path 66)(COI/RATS)------
PDCI (Path 65)(PDCI)------
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)

2017HEAVY SUMMER– 17HS2-OPCASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:May 27, 2016
To Staff:July01, 2016

PURPOSE:OPERATING CASE – TO REPRESENT ANTICIPATED OPERATING CONDITIONS WITH HEAVY FLOWS TO CALIFORNIA FROM THE NORTHWEST AND MODERATE FLOWS ELSEWHERE.
ITEMS TO BE PREPARED:From Case16HS4-Operating Case
Stability DataMaster Dynamics File[27]
Significant ChangesFrom Existing System
LOADS[28]:Expected peak load for the months of June - August
TIME: Peak time 1500 to 1700 hours MDT
GENERATIONHYDROTHERMALRENEWABLE[29]

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

INTERCHANGE[30]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Heavy230073%
Northwest to California/Nevada
COI (Path 66)(COI/RATS)Heavy4800100%
PDCI (Path 65)(PDCI)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)

Utah/Colorado to Southwest------
Southwest to Calif. (EOR Path 49/WOR Path 46)Southwest to Calif. (EOR/WOR)Moderate3000/5800 32%/57%
Intermountain to Adelanto DC (Path 27)Heavy166069%
San Diego to CFE (Path 45)Path 45 (San Diego to CFE)------
Midway to Vincent (Path 26)Heavy4000100%

2017LIGHT SUMMER– 17LS1-OPCASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:June 10, 2016
To Staff:July 15, 2016

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.
ITEMS TO BE PREPARED:From Case16LS1-Operating Case
Stability DataMaster Dynamics File[31]
Significant ChangesFrom Existing System
LOADS[32]:Expected minimum load for the months of June - August
TIME:0400 to 0600 hours MDT
GENERATIONHYDROTHERMALRENEWABLE[33]

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

INTERCHANGE[34]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)Moderate200063%
Northwest to California/Nevada
COI (Path 66)(COI/RATS)Moderate360075%
PDCI (Path 65)(PDCI)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)

Utah/Colorado to Southwest------%
Southwest to Calif. (EOR Path 49/WOR Path 46)Southwest to Calif. (EOR/WOR)Moderate4600/5900 49%/55%
Intermountain to Adelanto DC (Path 27)Heavy185077%
San Diego to CFE (Path 45)Path 45 (San Diego to CFE)------
Midway to Vincent (Path 26)Light150050%

2017LIGHT SPRING– 17LSP2-SCASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:July 22, 2016
To Staff:August26, 2016

PURPOSE:SCENARIO CASE – HEAVY SUMMER LOADS THROUGHOUT WECC REGION TO CAPTURE HIGH IMPORTS TO SOUTHERN Heavy summer loads throughout WECC region to capture high imports to Southern California.
ITEMS TO BE PREPARED:From Case165HSP1-OP
Stability DataMaster Dynamics File[35]
Significant ChangesFrom Existing System
LOADS[36]:45% of summer peak conditions to represent the months of March – April in the Desert Southwest
TIME:Afternoon hours (1800 to 2000 hours MDT)
GENERATIONHYDROTHERMALRENEWABLE[37]

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

INTERCHANGE[38]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)---1400[39]----
Northwest to California/Nevada
COI (Path 66)(COI/RATS)------
PDCI (Path 65)(PDCI)------
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)

Utah/Colorado to Southwest------
Southwest to Calif. (EOR Path 49/WOR Path 46)Southwest to Calif. (EOR/WOR)------
Intermountain to Adelanto DC (Path 27)------
San Diego to CFE (Path 45)Path 45 (San Diego to CFE)------
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.

2018 LIGHT AUTUMN – 18LA1-SREGIONAL PLANNING CASECASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:August26, 2016
To Staff:September30, 2016

PURPOSE:SCENARIO CASE –TO ACHIEVE MAXIMUM TRANSFERS OUT OF IDAHO AND MONTANA INTO THE NORTHWESTBASED ON PLANNING REGION REQUEST
ITEMS TO BE PREPARED:From Case20xx17-RegionalLSP1-S
Stability DataMaster Dynamics File[40]
Significant ChangesFrom Existing System
LOADS[41]:Minimum load in Idaho and Montana for the months of September - NovemberPlanning Region Spec
TIME:0200 to 0400 hours MSTPlanning Region Spec
GENERATIONHYDROTHERMALRENEWABLE[42]

CanadaMedian----Low50% Avail. Wind --
Northwest--Low--High50% Avail. Wind--
Idaho/MontanaMedian----Maximum75% Avail. Wind --
Colorado/Wyoming---75% Avail. Wind --
Northern California HydroMedian------
Northern California--Low---
Southern CaliforniaMedian--Median----
Arizona/New Mexico/Southern NevadaMedian-Median---

INTERCHANGE[43]CONDITIONTARGET% RATING

Canada to Northwest (Path 3)--High-1400[44]TBD75%--
Northwest to California/Nevada
COI (Path 66)(COI/RATS)Moderate--TBD3200--66%
PDCI (Path 65)(PDCI)----TBD--
Midway – Los Banos S-N (Path 15)----TBD--
Idaho to Northwest (Path 14)--HighTBD2000--83%
Montana to Northwest (Path 8)High210095%--TBD--
Utah/Colorado to Southwest------
(Path 31, 35, 78 Durango – Coyote 115 kV)

Utah/Colorado to Southwest--TBD--
Southwest to Calif. (EOR Path 49/WOR Path 46)Southwest to Calif. (EOR/WOR)----TBD/--TBD--/--
Intermountain to Adelanto DC (Path 27)----TBD--
San Diego to CFE (Path 45)Path 45 (San Diego to CFE)----TBD--
Midway to Vincent (Path 26)----TBD--

2026-27HEAVY WINTER– 27HW1CASE DESCRIPTION

CASE DUE DATES:To Area Coordinator:September30, 2016
To Staff:November 04, 2016

PURPOSE:GENERAL 10-YEAR CASE – WITH TYPICAL FLOWS THROUGHOUT WECC.
ITEMS TO BE PREPARED:From Case2025-26HW1
Stability DataMaster Dynamics File[45]
Significant ChangesFrom Existing System
LOADS[46]:Expected peak load for the months of December - February
TIME:1800 to 2000 hours MST
GENERATIONHYDROTHERMALRENEWABLE[47]