APPENDIX E:

TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. 10 YEAR TRANSMISSION PROJECTS

Proceeding 18M-XXXXE 1 of 33

Colo

rado

PUC

E-Fil

ings

Syst

em

Tri-State's 2018 Ten Year Transmission Plan Projects Table of Contents

Burlington ‐ Burlington (KCEA) Rebuild ................................................................. E-3 Burlington-Lamar 345 230kV ................................................................................... E-6 Falcon-Midway 115 kV ............................................................................................ E-9 Falcon-Paddock-Calhan 69-115kV Line Rebuild ................................................... E-12 Lamar Front Range ................................................................................................. E-16 Lost Canyon ............................................................................................................ E-19 San Luis Valley-Poncha 230 kV Line #2 ................................................................ E-22 Southwest Weld Expansion .................................................................................... E-25 Sunshine-Telluride Line Uprate .............................................................................. E-28 Western Colorado Transmission Upgrade .............................................................. E-31

Proceeding 18M-XXXXE 2 of 33

Project Sponsor: Tri‐State Generation and Transmission Association

Additional Project Participants:

Project Description: Rebuild the existing Burlington ‐ Burlington (KCEA) 115kV line

Voltage Class: 115 kV

Facility Rating: 242 MVA

Point of Origin/Location: Burlington

Point of Termination: Burlington (KCEA)

Intermediate Points:

Length of Line (in Miles): 2.0

Type of Project: Transmission Line

Development Status: Planned

Routing:

Subregional Planning Group: CCPG

Purpose of Project: Increase conductor thermal rating.

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $2,294,000

Schedule:

Construction Date:

Planned In‐Service Date: 2020

Regulatory Info:

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information:

Email

Phone

Chris Pink

cpink@tristategt.org

303‐254‐3339

Burlington ‐ Burlington (KCEA) Rebuild

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 3 of 33

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#*#*Burlington

Burlington Generation

Burlington (KC)

Burlington (PSC)

Burlington - Landsman Creek

Bonn

y Cre

ek - B

urlin

gton

Burli

ngto

n - B

urlin

gton

(Kc)

Burlington (Kc) - Burlington (Psc)Burlington - W

aanibe Tap

Burlington-Burlington KCEA 115kV Transmission Line Rebuild

Document Path: \\hqstore\geostore\Products\CapitalProjects\GeoMaps\Maps\MXD\PP74_Burlington-BurlingtonKCEA115kVTransmissionLineRebuild.mxd

This map includes confidential information of Tri-State and third parties. The GIS data and maps may not be disclosed to any third party.The user agrees to keep this information confidential and notdisclose it to third parties. If you have any questions regardingthis, please contact the Tri-State legal department.GIS data and maps available to Tri-State Generation andTransmission Association employees are provided as generalinformation to aid Tri-State transmission maintenance. No user of Tri-State’s GIS data and maps may sell any portion of theinformation provided therein. Tri-State makes no warranteeregarding accuracy or completeness of the data and maps. Usersshall rely only upon proper field verification of Tri-State GIS data.Last Updated: 10/28/2015 Author: johhan0 0.6 1.20.3

Miles

Burlington - Burlington KCEA 115kV Transmission Line Rebuild

#* Station - Tri-State

#* Station - Other UtilityTransmission Line - Tri-StateProject AreaProject Feature

¹

Proceeding 18M-XXXXE 4 of 33

Burlington - Burlington (KCEA) Rebuild

Under peak loading conditions, the K.C. Electric Association (KCEA) 69kV system fed from Smoky Hill substation cannot be switched to the west to pick up additional load for the loss of the Limon source after the Smoky Hill transformer is replaced with a larger unit. To mitigate this limitation, Tri-State will rebuild the Burlington-Burlington (KCEA) line with 795kcmil ACSR “Drake” conductor. The increased capacity will additionally help K.C. Electric Association’s serve new load in the area.

Proceeding 18M-XXXXE 5 of 33

Project Sponsor: Tri‐State Generation and Transmission Association

Additional Project Participants:

Project Description: Construct a 230 kV transmission line from Burlington Substation to  

Lamar Substation

Voltage Class: 230 kV

Facility Rating: 642 MVA

Point of Origin/Location: Burlington

Point of Termination: Lamar

Intermediate Points:

Length of Line (in Miles): 106 Miles

Type of Project: Transmission Line

Development Status: Under Construction

Routing:

Subregional Planning Group: CCPG

Purpose of Project: Improve load‐serving capability, remove generation operating 

restrictions & support renewable resource development in eastern 

Colorado.

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $54,000,000

Schedule:

Construction Date:

Planned In‐Service Date: 2021

Regulatory Info:

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information:

Email

Phone

Chris Pink

cpink@tristategt.org

303‐254‐3339

Burlington‐Lamar 230 kV Transmission Project 

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 6 of 33

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BonnyCreek

Lamar (CO)

Waanibe Tap

Willow Creek

Eads

Holly

Lamso

Flagler

Waanibe

Granada

Arapahoe

Prowers

Holly Tap

Fort Lyon

Las Animas

Smoky HillSand Creek

Kit Carson

Flagler Tap

Cheyenne Wells

Kit Carson Tap

Boone - Lamar

Arapahoe-Waanibe

Finney - Lamar

Eads

- Tap

South Fork

BurlingtonLandsman Creek

Hell Creek Tap

Burlington Generation

HaleLiberty

Stratton

SagebrushHell Creek

Burlington (KC)Burlington (PSC)

Kit Carson Wind Power

Big Sandy - Landsman Creek

Boone - LamarFinney - Lamar

Eads

- Tap

Kit C

arso

n Tap

- Kit

Carso

n

Do cumen t Path: \\hqsto re\geo sto re\Pro ducts\SystemPlan n ing\2016_ PUC\Map s\MXD\Overview _ Burlingto n Lamar345_ 230kV.mxd

Last Up dated: 11/30/2015 Autho r: ricgar

0 9 184.5Miles

Tri-State GenerationTri-State Generationand Transmissionand Transmission

Burlington-Lamar 230kV

#* Station - Tri-State

#* Station - Other UtilityTransmission Line - Tri-StateTransmission Line - Other UtilityProject Area

¹

Tri-State Gen eratio n an d Tran smissio n Asso ciatio n p ro vides GISdata to aid the develo p men t o f Tri-State p ro jects. No user o f Tri-State’s GIS data and map s may sell an y p o rtio n o f the info rmatio np ro vided therein . Tri-State makes n o warran tee regardin gaccuracy o r co mp leten ess o f the data and map s. Users shall relyo n ly up o n p ro p er field verificatio n o f Tri-State GIS data.

Proceeding 18M-XXXXE 7 of 33

Burlington-Lamar 230kV Transmission Project Past studies in the Boone-Lamar area of Colorado have shown voltage collapse for the Boone- Lamar 230kV line outage with cross-trips of all generation injected at Lamar 230kV. In order to mitigate these violations and provide for future growth and potential new generation, Tri-State determined the best solution was to construct a new transmission line from the existing Burlington substation to the existing Lamar substation.

Proceeding 18M-XXXXE 8 of 33

Project Sponsor: Tri‐State Generation and Transmission Association

Additional Project Participants:

Project Description: Planned uprate of existing 115 kV line between Falcon and Midway.

Voltage Class: 115 kV

Facility Rating: 146 MVA

Point of Origin/Location: Falcon

Point of Termination: Midway

Intermediate Points: Geesen, Lorson Ranch, Rancho

Length of Line (in Miles): 27.0

Type of Project: Transmission Line

Development Status: Planned

Routing:

Subregional Planning Group: CCPG

Purpose of Project: Increase conductor thermal rating.

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $5,616,000

Schedule:

Construction Date:

Planned In‐Service Date: 2021

Regulatory Info:

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information:

Email

Phone

Chris Pink

cpink@tristategt.org

303‐254‐3339

Falcon‐Midway 115 kV Line Uprate Project

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 9 of 33

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Midway

Falcon

Geesen

LorsonRanch

Fountain Valley Gen

Schriever Air Force Base

Lincoln - Midway

Boone - Midway

Gees

en - R

anch

oFa

lcon -

Gee

sen

Geesen - Schriever

Falcon - Fuller

Docume nt Path: \\hqs tore \ge os tore \Products \Sys te mPlanning\2016_PUC\Maps\MXD\Ove rvie w_FalconMidwayLine Uprate .mxd

Las t Update d: 11/30/2015 Author: ricgar

0 2.5 51.25Mile s

Tri-State GenerationTri-State Generationand Transmissionand TransmissionFalcon – Midway Falcon – Midway 115 kV Line Uprate 115 kV Line Uprate

#* Station - Other UtilityTransmission Line - Tri-StateProject AreaProject Transmission Line - TSGT

¹

Tri-State Ge ne ration and Transmis s ion As s ociation provide s GISdata to aid the de ve lopme nt of Tri-State proje cts . No us e r of Tri-State ’s GIS data and maps may s e ll any portion of the informationprovide d the re in. Tri-State make s no warrante e re gardingaccuracy or comple te ne s s of the data and maps . Us e rs s hall re lyonly upon prope r fie ld ve rification of Tri-State GIS data.

Proceeding 18M-XXXXE 10 of 33

Falcon-Midway 115kV Line Uprate The current Falcon-Midway 115kV transmission line has a thermal rating of 95MVA, which leads to forecasted overloads by the summer of 2018 from an outage on Tri-State’s 115kV Falcon-Fuller line. In order to mitigate this problem, Tri-State is raising, moving, or rebuilding structures along the line to increase the overall line rating to 140MVA. The increased capacity will help serve Mountain View Electric Association’s (MVEA) customer load in the area. The project is being built and financed solely by Tri-State.

Proceeding 18M-XXXXE 11 of 33

Project Sponsor: Tri‐State Generation and Transmission Association

Additional Project Participants:

Project Description: Planned rebuild of existing 69kV line between Falcon and Calhan.

Voltage Class: 115 kV

Facility Rating: 242 MVA

Point of Origin/Location: Falcon

Point of Termination: Calhan

Intermediate Points: Paddock

Length of Line (in Miles): 25.0

Type of Project: Transmission Line and Substation

Development Status: Planned

Routing:

Subregional Planning Group: CCPG

Purpose of Project: Increase conductor thermal rating and create 115kV loop.

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $33,400,000

Schedule:

Construction Date:

Planned In‐Service Date: 2022Regulatory Info:

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information: Chris Pink

Email cpink@tristategt.org

Phone 303‐254‐3339

Website Information http://www.tristategt.org/transmissionPlanning/puc3627_Transmissi

Falcon‐Paddock‐Calhan 115kV

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 12 of 33

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FALCONFALCON- FULLER- FULLER

BLAC

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UIRR

EL - F

ULLE

RBL

ACK

SQUI

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GEESEN - SCHRIEVERGEESEN - SCHRIEVER

FALC

ON - G

EESE

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LCON

- GEE

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GEESENGEESEN115kV115kV

PADDOCKPADDOCK115kV115kV

FALCONFALCON115kV115kV

SCHRIEVERSCHRIEVERAIR FORCEAIR FORCEBASE 115kVBASE 115kV

CLAREMONT230kV

FULLER230kV

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Tri-State Generationand TransmissionFalcon - Paddock 69 - 115kV Line Rebuild

0 1 20.5Miles

GIS data and maps available to Tri-State Generation and Transmission Association employees are provided as general information to aid Tri-State transmission maintenance. No user of Tri-State’s GIS data and maps may sell any portion of the information provided therein. Tri-State makes no warrantee regarding accuracy or completeness of the data and maps. Users shall rely only upon proper field verification of Tri-State GIS data.

This map includes confidential information of Tri-State and third parties. The GIS data and maps may not be disclosed to any third party. The user agrees to keep this information confidential and not disclose it to third parties. If you have any q uestions regarding this, please contact theTri-State legal department.

Date Created: 10/28/2014 Author: catcar

#0 Trans - Station - TSGT#0 Trans - Station - Other Utility

Transmission Line - TSGTTransmission Line - Other UtilityProject Area

Project Feature

¹

Proceeding 18M-XXXXE 13 of 33

Calhan - Paddock 115kV Line

CALHAN CALHAN

PEYTONPEYTON

PADDOCKPADDOCK

ELLICOTTELLICOTT

MERIDIAN RANCHMERIDIAN RANCH CALHAN - PEYTONCALHAN - PEYTON

Document Path: \\hqstore\geostore\Products\CapitalProjects\GeoMaps\Maps\MXD\PP22_Calhan_Paddock115kVLine.mxd

This map includes confidential information of Tri-State and third parties. The GIS data and maps may not be disclosed to any third party.The user agrees to keep this information confidential and notdisclose it to third parties. If you have any questions regardingthis, please contact the Tri-State legal department.GIS data and maps available to Tri-State Generation andTransmission Association employees are provided as generalinformation to aid Tri-State transmission maintenance. No user of Tri-State’s GIS data and maps may sell any portion of theinformation provided therein. Tri-State makes no warranteeregarding accuracy or completeness of the data and maps. Usersshall rely only upon proper field verification of Tri-State GIS data.Last Updated: 10/28/2014 Author: yanfaga0 1 20.5

Miles

Calhan-Paddock 115kV Line

Substation- Tri-StateTransmission Line- Tri-StateSubstation- Other UtilityTransmission Line- Other UtilityProject Area

Project Feature

Proceeding 18M-XXXXE 14 of 33

Falcon‐Paddock‐Calhan 115kV Line 

The current Falcon – Paddock – Calhan 69 kV transmission line will be rebuilt to create a 115 

kV loop in MVEA’s central system.  The 115 kV line will improve system reliability by looping 

the  existing  radial  115kV  and  69kV  substations  in MVEA’s  system  and  provide  increased 

voltage support. The 115 kV  line will also help serve Mountain View Electric Association’s 

(“MVEA”) customer load growth in the area.  The project is being built and financed solely 

by Tri‐State. 

 

Proceeding 18M-XXXXE 15 of 33

Project Sponsor: Tri‐State Generation and Transmission Association

Additional Project Participants: Public Service Company of Colorado/Xcel Energy

Project Description: Two high voltage transmission paths from Lamar Substation to Pueblo 

area and a second path from Lamar to substations near Brush and/or 

Deer Trail.

Voltage Class: 345 kV

Facility Rating: 2000 MW

Point of Origin/Location: Lamar, CO

Point of Termination: TBD: Comanche, Story, Pawnee, Avondale, Lamar, Lamar Energy 

Center, Burlington, Big Sandy, Missile Site

Intermediate Points: Burlington, Big Sandy, Boone

Length of Line (in Miles): 300‐350

Type of Project: Transmission Line

Development Status: Conceptual

Routing: Burlington, Big Sandy, Boone

Subregional Planning Group: CCPG

Purpose of Project: Tri‐State reliability, system load‐serving connectivity as regional 

power provider & future resources. Xcel Senate Bill 07‐100 & 

reliability.

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $900,000,000

Schedule:

Construction Date:

Planned In‐Service Date: TBD

Regulatory Info:

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information:

Email

Phone

Chris Pink

cpink@tristategt.org

303‐254‐3339

Lamar Front Range Project

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 16 of 33

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Arapahoe-Waanibe

Vilas 230 kV

Comanche 345/230kV

Missile Site 245/230kV

Big Sandy 345kV and 230/115kV

Burlington345/230kVand 230/115kV

Lamar EnergyCenter345kVSwitchboard/Lamar345/230kV

Horsetooth Tap

Wray

Carey

Limon

VilasLudlow

Lincoln

Reunion

La Junta

Limon Ct

WrayTap

Lyons Tap

Big Sandy

J.m Shafer

Walsenburg

South Fork

Vernon Tap

Burlington

Lamar (CO)

Limon (Kc)

North Yuma

Stem Beach

Henry Lake

Waanibe Tap

Erie SwitchLastChance

Kersey West

Van BremmerYork Canyon

Deering Lake

Crete Switch

Story 230 kV

Burro Canyon

Willow Creek

Story 345 KvLost Creek Tap

LandsmanCreek

Del Camino Tap

Black Squirrel

Hell Creek Tap

Olive Creek Tap

Pueblo West Tap

BlackForest Tap

Limon GenerationBurlingtonGeneration

Horsetooth Tap

Del CaminoSwitch

Knutson GenerationBrighton Knutson 230kV

Boone - Lamar

Vilas - Vilas Tap

Keota -Story

Boone - Midway

Boone - Lamar

Doc ument Path: \\hq store\geostore\Produc ts\SystemPlanning\2016_PUC\Map s\MXD\Overview_LamarFrontRangeProjec t.mxd

Last Updated: 11/30/2015 Author: ric gar

0 20 4010Miles

Tri-State GenerationTri-State Generationand Transmissionand TransmissionLamar-Front RangeLamar-Front RangeProjectProject

#* Station - Tri-StateTransmission Line - Tri-StateTransmission Line - Other UtilityProject AreaProject Feature

!( Project Feature ¹

Tri-State Generation and Transmission Assoc iation p rovides GISdata to aid the develop ment of Tri-State p rojec ts. No user of Tri-State’s GIS data and map s may sell any p ortion of the informationp rovided therein. Tri-State makes no warrantee regardingac c urac y or completeness of the data and map s. Users shall relyonly up on p roper field verific ation of Tri-State GIS data.

Proceeding 18M-XXXXE 17 of 33

Lamar Front Range Project

The Lamar-Front Range Project is a plan developed jointly through the CCPG to significantly improve load-serving capability, reliability, and potential resource accommodation in eastern and southeastern Colorado. The project could provide connectivity to the bulk transmission systems of Tri-State and PSCo, and provide strong “looped service” to areas with long radial transmission configurations. In concept, the project could create a transmission system capable of at least 2000 MW of new generation in eastern and southeastern Colorado.

This conceptual project identifies the transmission element additions that are needed to meet both companies’ needs, including delivery of future generation to loads in the Denver and Front Range areas. The present conceptual project involves double circuit 345 kV transmission lines connecting Lamar to the Pueblo area and Lamar to the Burlington and Big Sandy substations. Transmission connections in the Pueblo area and connections from Big Sandy to Missile Site, Story, and Pawnee are also currently being evaluated.

Proceeding 18M-XXXXE 18 of 33

Project Sponsor: Tri‐State Generation and Transmission Association

Additional Project Participants:

Project Description: New 115 kV transmission line between Lost Canyon and Main Switch 

Substations.  

Voltage Class: 115 kV

Facility Rating: 238 MVA

Point of Origin/Location: Lost Canyon

Point of Termination: Main Switch

Intermediate Points:

Length of Line (in Miles): 16.0

Type of Project: Transmission Line

Development Status: Planned

Routing:

Subregional Planning Group: CCPG

Purpose of Project: Increase load serving capability of CO2 loop

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $17,800,000

Schedule:

Construction Date:

Planned In‐Service Date: 2022

Regulatory Info:

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information: Chris Pink

cpink@tristategt.org Email

Phone

Lost Canyon ‐ Main Switch 115 kV Line

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 19 of 33

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Lost Canyon - Main Switch 115kV

Lost Canyon - Main Switch 115kV

Empire

Anasazi

Lost Canyon

GreatCut Tap

Main

Nuchu

Cortez

AaiolaMoqui C

Dolores

Fairview

Blue Door

GreatCut

Cahone Pump

East Cortez

Ruin Canyon

SandCanyon Cortez Hydro

Towaoc Canal

Basket Maker

Pleasant View

Fairview Pump

Goodman PointCortez Pipeline

Towaoc Canal Tap

Yellow Jacket West

Pleasant View Wapa

Great Cut PumpingPlant (Usbr)

Cahone - Empire

Lost Canyon - Shiprock

Lost

Cany

on - C

ureca

nti

Aaiol

a - P

leasa

nt Vi

ew

Tap -

Cah

one

Cortez Pipeline - Main

Docume nt Path: \\hqs tore \ge os tore \Products \Sys te mPlanning\2016_PUC\Maps\MXD\Ove rvie w_Los tCanyonMainSwitch115kV.mxd

Las t Update d: 11/19/2015 Author: yke vrop

0 2.5 51.25Mile s

Tri-State GenerationTri-State Generationand Transmissionand TransmissionLost Canyon - Main Lost Canyon - Main Switch 115kVSwitch 115kV

#* Station - Tri-State

#* Station - Other UtilityTransmission Line - Tri-StateTransmission Line - Other UtilityProject Area

!( Project Feature ¹

Tri-State Ge ne ration and Transmis s ion As s ociation provide s GISdata to aid the de ve lopme nt of Tri-State proje cts . No us e r of Tri-State ’s GIS data and maps may s e ll any portion of the informationprovide d the re in. Tri-State make s no warrante e re gardingaccuracy or comple te ne s s of the data and maps . Us e rs s hall re lyonly upon prope r fie ld ve rification of Tri-State GIS data.

Proceeding 18M-XXXXE 20 of 33

Lost Canyon – Main Swich 115 kV Line There is heavy load growth in the CO2 Loop consisting of the Yellow Jacket Switch-Main Switch-Sand Canyon-Hovenweep-Yellow Jacket 115 kV system. Constructing the new Lost Canyon-Main Switch 115 kV line will provide support to meet the future load growth for CO2 Loop.

Proceeding 18M-XXXXE 21 of 33

Project Sponsor: Tri‐State Generation and Transmission Association

Additional Project Participants: Xcel Energy

Project Description: Construct a second 230 kV transmission line from San Luis Valley to 

Poncha.

Voltage Class: 230 kV

Facility Rating: 631 MVA

Point of Origin/Location: San Luis Valley

Point of Termination: Poncha

Intermediate Points:

Length of Line (in Miles): 62 Miles

Type of Project: Transmission Line

Development Status: Planned

Routing:

Subregional Planning Group: CCPG

Purpose of Project: Provide reliable and adequate load support to San Luis Valley

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $58,000,000

Schedule:

Construction Date:

Planned In‐Service Date: 2022

Regulatory Info:

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information:

Email

Phone

Chris Pink

cpink@tristategt.org

303‐254‐3339

San Luis Valley‐Poncha 230 kV Line #2

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 22 of 33

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Ramon

Casa

Alkali

Waverly

Stanley Tap

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Plaza (Tsgt)San Luis Valley

Poncha - San Luis Valley

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Carmel

Poncha

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Moffat

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Querida

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Saguache

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La Garita

Canon West

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Ft Garland

Mirage Jct

Ray Lewis

Rio Grande

Hooper Tap

Canon CityCotter Mill

North Canon

Villa GroveKerber Creek

Mears Junction

Plaza (Slvrec)

Tallahassee Tap

Poncha JunctionSalida (Wapa/psco) Twelve Mile Canon West - Poncha

Fort Garland - Tap

Mosca Jct. - Moffat

Creede - Highland

Moffat - SaguacheOx Cart - Villa Grove

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Last Updated: 11/20/2015 Author: ykevrop

0 8 164Miles

Tri-State GenerationTri-State Generationand Transmissionand TransmissionSan Luis Valley 230kVSan Luis Valley 230kVLine DevelopmentLine Development

#* Station - Tri-State

#* Station - Other UtilityTransmission Line - Tri-StateTransmission Line - Other UtilityProject Area

¹

Tri-State Generation and Transmission Assoc iation p rovides GISdata to aid the development of Tri-State p rojec ts. No user of Tri-State’s GIS data and map s may sell any portion of the informationp rovided therein. Tri-State makes no warrantee regardingac c urac y or completeness of the data and map s. Users shall relyonly up on p roper field verific ation of Tri-State GIS data.

Proceeding 18M-XXXXE 23 of 33

San Luis Valley – Poncha 230 kV #2

New high-voltage transmission must be built in the San Luis Valley (SLV) region of south-central Colorado to restore electric system reliability and customer load-serving capability, and to accommodate development of potential generation resources. . Tri-State Generation and Transmission (Tri-State) and Public Service Company of Colorado (Public Service) facilitated a study effort through the Colorado Coordinated Planning Group (CCPG) to perform an evaluation of the transmission system immediately in and around the SLV and develop system alternatives that would improve the transmission system between the SLV and Poncha Springs (Poncha), Colorado. Both Tri-State and Public Service have electric customer loads in the SLV region that are served radially from transmission that originates at or near Poncha. The study concluded that, at a minimum, an additional 230 kV line is needed to increase system reliability. Studies show that this could be accomplished by either adding a new 230 kV line or rebuilding an existing lower voltage line to and operating it at 230 kV.

Proceeding 18M-XXXXE 24 of 33

Project Sponsor:

Additional Project Participants:

Project Description:

Tri‐State Generation and Transmission Association

Xcel Energy

Construct approximately 30 aggregated miles of 115 kV and 230 kV 

transmission lines with six potential load‐serving substations and/or 

line taps.

Voltage Class: 230 kV

Facility Rating: 300 MW

Point of Origin/Location: JM Shafer

Point of Termination: South Kersey, Henry Lake

Intermediate Points: Davis, Colfer (Hudson), Rattlesnake Ridge, Neres Canal, Greenhouse

Length of Line (in Miles):

Type of Project:

Development Status:

30 miles

Transmission Line and Substation Under Construction

Routing:

Subregional Planning Group: CCPG

Purpose of Project: Load‐serving

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $70,000,000

Schedule:

Construction Date:

Planned In‐Service Date: 2022

Regulatory Info: CPCN filed 8/2014

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information:

Email

Phone

Chris Pink 

cpink@tristategt.org

303‐254‐3339

Southwest Weld Expansion Project

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 25 of 33

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Colfer

Greenhouse

Neres Canal

Rattlesnake Ridge

J.m Shafer

Henry Lake

Erie Switch

Kersey West

Del Camino Switch

Henry Lake - StoryErie - Sipres Henry Lake - Sipres

RMEC

Evans

Davis

Ennis

Hudson

DaconoFulton

Sipres

Kersey

Vasquez

Bromley

Spindle

Rosedale

Lochbuie

Highland

Gilcrest

Lasalle Johnstown

Unc Cogen

Box Elder

FrederickDavis Tap

Godfrey Sw

Keenesburg

Unc SwitchBoomerang

Kersey Tap

Fort Lupton

Rinn Valley

South Kersey

Platte Valley

Arrowhead Lake

Brighton 34.5kv

Del Camino (Up)

Hanger 160 Solar

Fort Saint Vrain

United Power Solar

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t St. V

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Docume nt Path: \\hqs tore \ge os tore \Products \Sys te mPlanning\2016_PUC\Maps\MXD\Ove rvie w_Southw e s tWe ldExpansionProje ct.mxd

Las t Update d: 11/20/2015 Author: yke vrop

0 2.5 51.25Mile s

Tri-State GenerationTri-State Generationand Transmissionand TransmissionSouthwest Weld Southwest Weld Expansion ProjectExpansion Project

#* Station - Tri-State

#* Station - Other UtilityTransmission Line - Tri-StateTransmission Line - Other UtilityProject AreaProject Feature

!( Project Feature ¹

Tri-State Ge ne ration and Transmis s ion As s ociation provide s GISdata to aid the de ve lopme nt of Tri-State proje cts . No us e r of Tri-State ’s GIS data and maps may s e ll any portion of the informationprovide d the re in. Tri-State make s no warrante e re gardingaccuracy or comple te ne s s of the data and maps . Us e rs s hall re lyonly upon prope r fie ld ve rification of Tri-State GIS data.

Proceeding 18M-XXXXE 26 of 33

Southwest Weld Expansion Project

Due to large scale oil and gas development in Southwest Weld County and native load growth, Tri-State is planning on constructing approximately 30 aggregate miles of 115kV and 230 kV transmission lines to meet the forecasted demand of approximately 300MW within the next five years. Six potential 115kV load-serving substations and/or line taps will be constructed by Tri- State, while new 69kV transmission lines and substations will be constructed by United Power for the project.

Proceeding 18M-XXXXE 27 of 33

Project Sponsor: Tri‐State Generation and Transmission Association

Additional Project Participants:

Project Description: Convert Sunshine‐Telluride to 115kV & Sunshine Reactor Addition

Voltage Class: 115 kV

Facility Rating: 95 MVA

Point of Origin/Location: Sunshine

Point of Termination: Telluride

Intermediate Points:

Length of Line (in Miles): 4.8

Type of Project: Transmission Line and Substation

Development Status: Under Construction

Routing:

Subregional Planning Group: CCPG

Purpose of Project: Create room at Sunshine for mobile transformer and reactor

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $3,063,000

Schedule:

Construction Date:

Planned In‐Service Date: 2019

Regulatory Info:

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information:

Email

Phone

Chris Pink

cpink@tristategt.org

303‐254‐3339

Sunshine‐Telluride Line Uprate & Reactor Addition

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 28 of 33

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Docum ent Path: \\hqsto re\geo sto re\Pro ducts\Ca p italPro jects\GeoMa p s\Ma p s\MXD\PP89_Sunshine_Telluride69_115kVUp rate.m xd

La st Updated: 11/1/2016 Autho r: kevro p

0 0.5 10.25Miles

Sunshine-Telluride Line Uprate

#* Statio n - Tri-State

#* Statio n - Other UtilityTra n sm issio n Line - Tri-StatePro ject AreaPro ject Feature

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This m a p includes co nfidential info rm atio n o f Tri-State a nd third p a rties.The GIS data a nd m a p s m a y n o t be disclo sed to a n y third p a rty. The useragrees to keep this info rm atio n co nfidential a nd n o t disclo se it to thirdp a rties. If yo u ha ve a n y questio n s rega rding this, plea se co ntact the Tri-State legal dep a rtm ent.GIS data a nd m a p s a vailable to Tri-State Generatio n a nd Tra n sm issio nAsso ciatio n em p lo yees a re p ro vided a s general info rm atio n to aid Tri-Statetra n sm issio n m ainten a nce. No user of Tri-State’s GIS data a nd m a p s m a ysell a n y p o rtio n o f the info rm atio n p ro vided therein. Tri-State m akes n ow a rra ntee rega rding accuracy o r co m p leteness o f the data a nd m a p s. Usersshall rely o nly up o n p ro p er field verificatio n o f Tri-State GIS data.

Proceeding 18M-XXXXE 29 of 33

Sunshine-Telluride Line Uprate

Tri-State has identified the need for additional space at Sunshine substation to allow connection of a 115-69 kV mobile transformer in emergency conditions, as well as connection of a new 16 MVAR reactor to supplement and backup the existing Norwood reactor used to mitigate high voltages in the area. To create additional space, the existing Sunshine-Telluride 69 kV line will be re-energized at 115 kV and the Sunshine 115-69 kV transformer will be removed. Energizing the Sunshine – Telluride line at 115 kV will additionally improve load serving capability at Telluride.

Proceeding 18M-XXXXE 30 of 33

Project Sponsor: Tri‐State Generation and Transmission Association

Additional Project Participants:

Project Description: Upgrade existing transmission line and facilities from Montrose 

Substation to Cahone Substation from 115 kV to 230 kV construction.  

A new Maverick 115kV substation will be constructed near Nucla 

substation.  The existing Nucla ‐ Norwood 115kV line will sectionalize 

at Maverick substation.

Voltage Class: 230 kV

Facility Rating: 645 MVA

Point of Origin/Location: Montrose

Point of Termination: Cahone

Intermediate Points: Nucla, Maverick

Length of Line (in Miles): 80 Miles

Type of Project: Transmission Line and Substation

Development Status: Under Construction

Routing:

Subregional Planning Group: CCPG

Purpose of Project: Reliability ‐ eliminate need for existing Nucla Remedial Action Scheme 

and replace failing structures.

Project Driver (Primary): Reliability

Project Driver (Secondary):

Estimated Cost (in 2014 Dollars): $120,000,000

Schedule:

Construction Date: 2014

Planned In‐Service Date: 2019

Regulatory Info:

Regulatory Date:

Permitting Info:

Permitting Date:

Contact Information:

Email

Phone

Chris Pink

cpink@tristategt.org

303‐254‐3339

Western Colorado Transmission Upgrade Project

Tri‐State Generation and Transmission Association

2018‐2028 Transmission Plan

Proceeding 18M-XXXXE 31 of 33

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Nucla

Cahone

Empire

Anasazi

Norwood

Telluride

Cow Creek

MolasTap

HotchkissDoughspoon

Wilson Mesa

Happy CanyonMontrose 115Montrose

345

StarrNelson

Peach Valley

GreatCut Tap

Garnet Mesa Tap

Spring CreekTap

Nucla Generation

Burro Bridge

SilvertonTap

Document Path: \\hq s tore\geos tore\Prod ucts \Sys temPlanning\2016_PUC\Maps\MXD\Overview_Wes ternColorad oTransmis s ionLine.mxd

Las t Upd ated : 12/16/2015 Author: ykevrop

0 7.5 153.75Miles

Tri-State GenerationTri-State Generationand Transmissionand TransmissionWestern ColoradoWestern ColoradoTransmission UpgradeTransmission UpgradeProjectProject

#* Station - Tri-State

#* Station - Other UtilityTransmission Line - Tri-StateTransmission Line - Other UtilityProject Area

¹

Tri-State Generation and Transmis s ion As s ociation provid es GISd ata to aid the d evelopment of Tri-State projects . No user of Tri-State’s GIS d ata and maps may sell any portion of the informationprovid ed therein. Tri-State makes no warrantee regard ingaccuracy or completenes s of the d ata and maps . Us ers s hall relyonly upon proper field verification of Tri-State GIS d ata.

Proceeding 18M-XXXXE 32 of 33

Western Colorado Transmission Upgrade Project (Montrose-Nucla-Cahone 230 kV Line) The 40 mile long Montrose – Nucla and Nucla – Cahone 115kV transmission lines are old, overloaded, undersized, and must be rebuilt. To ensure continued reliability of the southwest Colorado transmission system, Tri-State is replacing them with new, higher capacity lines rated for 230kV operation. This project will increase the load serving capability of the southwest Colorado transmission system and also eliminate the need for the existing Nucla Remedial Action Scheme (RAS), which trips the Montrose-Nucla line when it starts to overload after contingencies/outages in the area.

Proceeding 18M-XXXXE 33 of 33