ICT Strategic Transmission Plan (ISTEP)Review and Status Update

Entergy Transmission SummitJuly 29, 2008Astor Crown PlazaNew Orleans, Louisiana Douglas Bowman, PE

Lead Engineer, ICT Planning501-688-1640

dbowman@SPP.org

ISTEP

• ICT Strategic Transmission Expansion Plan• Attachment K

– Paragraph 14.1 - “The ICT will identify potential economic upgrades on the Transmission System, including upgrades to existing facilities as well as construction of new facilities.”

– Paragraph 14.3 – “The ICT will identify such upgrades based on screening criteria, which may include considerations such as frequent transmission loading relief events, frequently constrained flowgates in the Available Flowgate Capability process or Weekly Procurement Process (WPP), flowgates with high congestion costs as identified in the WPP process, and commonly invoked must-run operating guides.”

ISTEP Scope and Purpose• Promote transmission expansion on the Entergy

transmission system by identifying and developing economic projects that address transmission constraints through powerflow studies and stakeholder input

• Focus on creating new, higher-voltage transmission in order to address potential issues on the Entergy transmission system, as opposed to upgrading the underlying lower-voltage system.

• Not used for cost allocation• Entergy is not obligated to construct ISTEP projects• Not related to reliability requirements

ISTEP Objective

• Improve Load-Serving Capability

• Improve Inter-regional Transfer Capability

• Improve Load Pockets/Load Centers

• Relieve Constraining Flowgates

ISTEP Phase I

• Completed 12/2007

• Identified Operational Limitations– 213 TLRs resulting in curtailment of 340GWh

of firm and non-firm transmission service from January to October, 2007.

• Identified Transfer Capability Limitations– Most limiting flowgates identified

ISTEP Phase I (continued)

• Modeling– 2015 Summer Peak Case– Includes 2008 Construction Plan upgrades– Does not include Base Plan upgrades– Does not include Operating guides,

redispatch, breaker operation, or other mitigation plans

ISTEP Phase I (continued)

• 20 proposed projects consisting of one or more transmission upgrades

• Proposed Projects– Louisiana – 7 Projects– Arkansas – 5 Projects– Mississippi – 5 Projects– Texas – 1 Project– Other – 2 Short Term Projects

ISTEP Phase II

• Stakeholders ranked Phase I projects

• Approximately 20 stakeholder responses

• Top 5 were selected from each stakeholder ranking

• Final ranking was developed using a combination of stakeholder rankings and the ICT’s knowledge of the Entergy system.

ISTEP Phase II Projects

• South LA Bulk

• Central Arkansas 230 kV

• Acadiana Area

• Central MS Bulk

• McAdams Series Reactor

• Seams Projects

South LA Bulk Projects address:

• WOTAB Import

• Constraining flowgates

• Acadiana

• Flowgates:

• Webre – Wells

• Mt. Olive – Hartburg

• Wilbert – Livonia

• Terrebonne – Greenwood

• Cecelia – Moril

• Meaux - Judice

South LA & Acadiana

Fancy Point – Hartburg 500 kV

Webre – Richard 500kV

• Projects address:• Constraining flowgates• Flowgates:

– Morrilton East-Gleason

– Conway- Donaghey

Cabot-Gold Creek 230kV

Gleason - Conway W.

230 kVGold Creek-

Conway Industrial 230kV

Central AR 230kV

Conway W. – Conway Ind.

230kV

Central AR 230kV

• Projects address:• Constraining flowgates• Flowgates:

– Morrilton East-Gleason

– Conway- Donaghey

Kanis-Mabelvale

230 kV

Wrightsville-Little Rock South

230kV

Kanis 230/115kV transformer

Little Rock South 230/115kV transformer

Wrightsville 500/ 230kV

transformer

Mabelvale 500/230kV

transformer

Central AR 230kV

Central AR 230kV

• Projects address:• Constraining flowgates• Flowgates:

– Morrilton East-Gleason

– Conway- Donaghey

Mt. Pine South-Carpenter

230 kV Carpenter-Hot Springs EHV

230kV

Hot Springs-Cheetah 230kV

Mabelvale-Cheetah 230kV

Cheetah-Mt. Pine South

230kV

Hot Springs EHV 500/230kV

transformer

Central AR 230kV

Acadiana Area Projects address:

• WOTAB Import

• Constraining flowgates

• Acadiana

• Flowgates:

• Webre – Wells

• Mt. Olive – Hartburg

• Wilbert – Livonia

• Terrebonne – Greenwood

• Cecelia – Moril

• Meaux - Judice

South LA & Acadiana

Richard – Sellers 230 kV

Sellers – Meaux 230 kV

Sellers– Segura 230 kV

Sellers – Labbe 230kV

Labbe – Bonin 230 kV

Wells – Labbe 230kV

Projects address:

• Constraining flowgates

• Flowgates:

• Ray Braswell – Baxter Wilson

Central MS Bulk

Grand Gulf – Ray Braswell

500 kV

Central MS Bulk

McAdams Series Reactor

• Install a 36Ω reactor in series with McAdams 500/230 kV transformer

McAdams Series Reactor

500/230kV

Seams Projects

• Ft. Smith-ANO-ISES 500kV

• El Dorado – Longwood Series Compensation

• Messick 500/230

• Ft. Smith-NW Texarkana-McNeil 500kV-Turk

• S. Fayetteville – Van Buren – ANO 500kV

Ft. Smith – ANO – ISES 765 kV

Ft. Smith – ANO – ISES

500 kV

• Projects address:• Improve SPP/Entergy

Interface

El Dorado – Longwood Series Compensation

• Increase Transfer Capability of the Line

El Dorado – Longwood Series Compensation

Messick 500/230 kV

• Mt Olive – Hartburg Tap Stability Issue

• Improve SPP/Entergy Interface

Existing Mt. Olive - Hartburg 500kV

Messick 500/230kV

Ft. Smith – NW Texarkana – Turk – McNeil 500 kV

FT. Smith – NW Texarkana 500kV

NW Texarkana – Turk 500kV

Turk – McNeil 500kV

Turk

• Projects address:• Improve SPP/Entergy

Interface

S. Fayetteville – Van Buren – ANO 500kV

S. Fayetteville – Van Buren 500 kV

Van Buren – ANO 500kV

• Projects address:• Improve

SPP/Entergy Interface

Status

• South LA Bulk– Engineering analysis complete– Economic analysis proceeding

• Central Arkansas 230 kV– Engineering analysis underway

• Acadiana Area– Engineering analysis complete– Currently in stakeholder negotiations

Status (continued)

• Central MS Bulk– Engineering analysis underway

• McAdams Series Reactor– Engineering analysis complete– Currently in stakeholder negotiations

• Seams Projects– Engineering analysis underway

ISTEP Timeline

ISTEP Phase I Report

Published

Dec. 4, 2007

LTTIWG Meeting: Discuss

comments and establish scope

for additional analysis

Feb. 12, 2008

Stakeholder comment period Stakeholder

comment period ends

Feb. 1, 2008

LTTIWG Meeting: Present status

update and list of seams projects

for analysis

May, 2008

Transmission Summit: Present update of study

status

July, 2008

LTTIWG Meeting: Present update of study status and

Webre – Wells Economic Study

Results

September, 2008

Complete ISTEP Phase II

December, 2008

LTTIWG Meeting: Present Final Strategic Plan

Phase II Report

January, 2009

LTTIWG Meeting: Present update of

study status

October, 2008

Next Steps• ICT to study ISTEP projects in further detail

– Continue engineering analysis of ISTEP and seams projects

– Complete Webre-Wells economic analysis – Complete economic analysis of remaining ISTEP and

seams projects