2011 San Luis Valley Load, MW

socotransmission.com

2011 San Luis Valley Load, MW

Tonight’s Agenda

� Why we’re here

� Tri-State & SLVREC overview

� History of project

� Reliability issues in the valley

� Current studies

� How to submit comments

� Please hold your questions until end of

presentation

2


Who is Tri-State

3


• 44 member distribution

cooperatives

• 200,000 square-mile service

territory

• 1.5 million consumers

• 1,475 employees

(includes subsidiaries)


Tri-State’s Mission

To provide our member owners a reliable, costbased

supply of electricity while maintaining a

sound financial position through effective utilization

of human, capital and physical resources in

accordance with cooperative principles.

5


Cooperative Characteristics

� Local

� Not-for-profit

� Consumer-owned

� Democratically governed

� Stable, proven business model

� Committed to community

6


Transmission System

� Tri-State owns,

operates and

maintains a 5,191mile

high-voltage

transmission

network throughout

four states

� 671 delivery

points

� 200,000 squaremile

service

territory

7


San Luis Valley Rural

Electric Cooperative

8


SLVREC Territory

9


SLVREC Territory

� SLVREC serves 3,125 square miles

� Alamosa County

� Rio Grande County

� Costilla County

� Conejos County

� Saguache County

� Mineral County

� Small portion of Hinsdale County

10


SLVREC Serves the Valley

� 12,227 meters

� 111 miles of transmission

� 2141 miles of overhead distribution line

� 524 miles of underground distribution line

� 2,776 miles of energized line

� 7,105 cooperative members

11


History of SLV Project

12


SLV Reliability Problems

1995-1997

� Reliability issues identified if the 230 kV SLV-

Poncha Pass Line is disrupted

� Electric load during irrigation months strained

transmission system

� Tri-State led study with Western, PSCo and

SLVREC to identify options to improve reliability

and load-serving capability in 1997

� Study identified need for additional transmission

as well as interim measures to improve reliability

13


Steps taken to improve

reliability

� Replaced the existing 230/115 kV transformer at SLV

Substation with 2-230/115 kV transformers

� Installed 2nd 115/69 kV transformer at SLV

Substation

� Installed capacitor banks to improve voltage support

� Temporarily ran PSCo gas fired generators

� Facilitate general Demand Side Management and

Energy Efficiency and conservation programs

� Installed Under-Voltage Load Shedding system that

causes SLVREC customers to lose service when

230 kV line out during high loads

14


SLV Reliability Problems

1998-2008

� 2004 Study – studied options to resolve reliability

concerns

� Study found 230 kV line required

� Exceeded 65 MW approximately 20% of the time

in 2004 – split between SLVREC and PSCo

� 2007-2008 – Tri-State developed plans for a 230

kV San Luis Valley to Walsenburg transmission

line

15


2008 Study & PSCo Partnership

� Completed Alternative Evaluation and Macro

Corridor Study, including evaluation of:

� Generation addition options – 88-124 MW units

studied

� Demand side management, energy efficiency, and

distributed generation options including solar PV

� Transmission options

� Study is available at www.socotransmission.com

under the “Studies” tab

� Signed an MOU with PSCo to develop joint

project

16


Joint Project

� May 2009 – Tri-State and PSCo Filed CPCN Application

with PUC for SLV-Calumet-Comanche Transmission

Project

� September 2011 – Final Approval of CPCN from PUC

� October 2011 – Trinchera Ranch files appeal of CPCN at

Costilla County District Court and Denver County

� October 2011 – PSCo announces it is likely that it will

end its involvement in the SLV-Calumet-Comanche joint

project

� Final decision dependent on PUC’s agreement with PSCo’s

resource needs as described in its 2011 Electric Resource

Plan

18


Continuing Reliability

Issues in the Valley

19


Existing Transmission System

20


1995 Loads in SLV

21


2011 Loads in SLV

160

140

120

100

80

60

40

20

0

January 1, 2011

February 20, 2011

2011 San Luis Valley Load, MW

April 11, 2011

San Luis Valley Load, MW Stability limit

May 31, 2011

July 20, 2011

September 8, 2011

October 28, 2011

December 17, 2011

22


2007-2011 Daily Line Load

Average

23


2012 – Where are we now?

� Reliability need still exists for Tri-State

� New peak reached in 2011 in the valley at ~148

MW

� SLVREC existing peak is over 70MW

24


Current Studies

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Studies for Tri-State Only

Project

� Generation options

� Transmission options

� Demand side management and energy efficiency

26


Generation Options

� Municipal Solid Waste

� Biomass

� Solar PV

� Solar PV with Battery

� Solar Thermal Electric

� Gas Turbines

� Hydro Electric

� Geothermal

� Fuel Cells

� Gas & Heat Generation

� Smart Meters

� Community Energy

Storage

� Hybrid Ice Air

Conditioning

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Transmission Options

� Connection points include

� Poncha

� Walsenburg-Calumet

� Taos-Ojo

� Iron Horse Substation

� Relationship to regional transmission system

� Reliability considerations include looped service

and a separate electrical source

28


Existing Transmission System

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How to submit your comments

� Visit comment stations following presentation

� Visit www.socotransmission.com for comment

form

� Call Sarah Carlisle at 303-254-3396 or email at

scarlisle@tristategt.org

� Comments due May 4 th

� Comment summary will be posted on project

website mid-May

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