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CCPGSenate Bill 100

Lamar – Front Range Presentation

May 27, 2010

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Senate Bill 100 requiresDesignate “Energy Resource Zones”Develop plans for expansion of transmission for

delivering power from beneficial energy resource in or near such zones

Submit proposed projects for CPCN

Senate Bill 07-100

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New Lamar-Comanche 345 kV & Lamar - Missile Site 345 kV ISD 2016

New San Luis Valley-Calumet-Comanche 230 & 345 kV lines ~ ISD 2013

New Midway-Waterton 345 kV ~ISD 2011

New Lamar –Vilas 345 kV ISD 2016

New Pawnee-Daniels Park 345 kV -2nd circuit ~ISD 2016

New Missile Site 230 kV ISD 2010) & 345 kV (ISD 2013)

New Ault-Cherokee 230 kV ~ISD 2015

New Pawnee-Smoky Hill 345 kV, ISD 2013

2009 SB-100 Transmission Plan

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CCCCCCPPPGGG *Generation values are not simultaneous

Item Project Generation (MW)*

In Service Date*

Project Status Mileage(kV,mi)

1. Missile Site 230kV Switching Station 250 12/10 Project Initiated, no CPCN necessary

n/a

2. Midway-Waterton 345kV Transmission Project

6/11 CPCN confirmed May 2009 345 , 82

3. Pawnee-Smoky Hill 345kV Transmission project

500 6/13 CPCN granted Feb. 27, 2009 230 , 95

4. San Luis Valley-Calumet-Comanche Transmission Project

750 - 1400 5/13 Joint CPCN filing May 14, 2009 by PSCo and TSG&T

230 , 95345 , 45

5. Missile Site 345kV Switching Station 5/13 Petition for Declaratory Order n/a

6. Lamar/Vilas-Front Range 345/500kV•Lamar-Comanche•Lamar-Missile Site

800 - 1000 16–17 Studies / CPCN 2010 345 , 330

7. Ault-Cherokee 230kV Transmission Project

300 - 600 15–16 TBD 230 , 85

8. Pawnee-Daniels Park 345kV Transmission Project

300 - 500 16–17 TBD 230 , 15345 , 95

2009 SB-100 Transmission Plan

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Lamar – Front Range Scope

Purpose: evaluate transmission alternatives to reliably alleviate existing constraints that inhibit potential resource development in southeast and east central Colorado from reaching electrical customer loads along the Front Range.

Accommodate resource development in ERZ #3 (GDA 6) and ERZ #2 (GDA 5, 7)

Interconnect Lamar/Vilas to Comanche & Missile Site

Two Primary AlternativesEastern CorridorCentral Corridor

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Lamar – Front Range Alternative 1

Comanche

Calumet

Boone

LamarPlanned/Proposed

345 kV

230 kV

115 kV

Burlington

Big Sandy

Missile Site

Pawnee

Daniels Park

Smoky Hill

Midway

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Alternative 1

Vilas

Segment 1Burlington – Missile Site

Segment 2Lamar - Burlington

Segment 3Lamar - Comanche

Segment 4Lamar - Vilas

100-500

500-1500

100-300

100-200

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Resource Injection

ScenarioLamar/Energy Center

Vilas BurlingtonCheyenne

/KiowaWray Big Sandy

CLRTPG (A) 1420 0 0 0 0

CLRTPG (C) 2500 0 1150 100 200

C Scaled 1382 0 630 55 110

HPX 650 150 50 150 250

LFR (1)GDA 5

Burlington - MS100-500

LFR (2)GDA 6-5

Lamar – Burl-MS

LFR (3)GDA 6

Lamar - Comanche

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Lamar – Front Range Alternative 2

Comanche

Calumet

Boone

Lamar

Planned/Proposed

345 kV

230 kV

115 kV

Burlington

Big Sandy

Missile Site

Pawnee

Daniels Park

Smoky Hill

Midway

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Alternative 2

Vilas

Segment 1Burlington – Missile Site

Segment 2Lamar – Missile Site

Segment 3Lamar - Comanche

Segment 4Lamar - Vilas

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Lamar – Front Range Scope - Studies

BenchmarkSegment Analysis

Potential PhasingVoltage

345/500Circuits

Single/Double2020 Base CasePSCo/Tri-State Lead

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Questions