Entergy Integration Study
Update
Jonathan Rose
Cathey Carter
Warren Lasher
Regional Planning Group
November 14, 2008
Purpose
To update the Phase II Entergy Integration
Study (completed 12/2006) with input
assumptions that are consistent with a
contemporaneous study being conducted
by SPP
Study is nearly complete and report is in
review.
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Entergy Area Overview
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Study Assumptions
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Base case built from 2012 case of 2007 5-Year Plan
Delivered natural gas price: $7/MMBtu
Includes all generating units in ERCOT and
Entergy operating today or with signed
interconnection agreements as of July 1, 2008
Cost estimates for transmission improvements
provided by Entergy-Texas, Inc.
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Asynchronous Ties
• Ties provided for SPP reliability and for contractual
obligations and power purchase agreements.
• 100 MW asynchronous tie at Quarry, halfway
between Grimes and Crockett.
• 827 MW asynchronous ties at Hartburg.
– 244 MW on the 500-kV Hartburg bus.
– 583 MW on the 230-kV Hartburg bus.
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Major Reliability Projects
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Extend the existing ERCOT 345-kV Kuykendahl – King line to the
Entergy Porter substation; install one 345-kV/138-kV autotransformer
at Porter. ($54,710,000)
New single-circuit 345-kV line from the ERCOT Roans Prairie
substation to the Entergy Grimes substation. ($8,030,000)
New 345-kV line from Quarry to Entergy Rivtrin substation.
($33,000,000)
Rebuild the Entergy 69-kV line from Fawl to Kirbyville as a 138-kV
line and tie to the Entergy 138-kV Kirbyville substation.
($16,510,000).
Rebuild the existing Entergy 138-kV line between the Porter and
Oakridge substations. ($5,429,000).
Upgrade the existing Entergy 138-kV line between the Navasota and
Longmire substations ($27,827,000).
Upgrade the existing 69-kV lines from the Sourlake to Dome
substations, the Dome to Batson substations, and the Gallier to
Elizabeth substations ($11,586,000)
Total cost of all reliability projects (including asynchronous ties):
$486 million
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Major Reliability Projects
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Economic Projects
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Add a second 500-kV/230-kV autotransformer at the Hartburg
substation ($19,800,000)
Install one 345-kV/138-kV 800-MVA autotransformer at Porter
rather than the 400-MVA auto, as called for in the reliability
project list. ($10,800,000)
Second 230-kV circuit from the Hartburg to Sabine substations
on new towers. ($30,180,000)
Close the Dayton-Crosby 138-kV line and upgrade the line to a
rating of 531 MVA. ($11,834,000)
Construct a new substation at Canal, tapping the 345-kV line
connecting the Cedar and N Belt substations.
Construct a 345-kV line between the Cypress, China and
Canal substations. Install new autotransformers at China and
Cypress substations. ($225,600,000)
Total cost of economic-driven projects: $298 million. Modeled
production cost benefits: $63 million.
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Economic Projects
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Scenarios
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All CREZ wind (an additional 11,553 MW)
Delivered natural gas price: $11/MMBtu
Reduced asynchronous tie capacity at Hartburg
(244 MW)
Cottonwood generator in the Eastern Interconnect
Additional 345-kV line from Deweyville to Canal
(Kelson proposal)
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Questions?
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