Entergy Mississippi, Inc. Transmission Projects Facts
Nov. 24, 2009
Entergy Mississippi, Inc. today announced that it has completed, has in construction or in planning
transmission system expansions and improvements that represent an investment of approximately $500
million in upgrades, improvements and new construction over eight years.
This nearly half billion dollar investment is over the years 2006 through 2013.
Below is a list of major upgrades and expansions Entergy Mississippi has made or is planning to make
over that time period.
The company has also made or plans to make numerous smaller value upgrades and improvements that
collectively represent investment of several hundred million dollars.
2006 -- 2008
Twinkletown substation: This substation in DeSoto County added more distribution capacity. It went into
service in the summer of 2006 and enhances reliability during summer peak demand. This substation is
on the company’s 230 kV transmission line that runs between its Freeport and Robinsonville substations.
The project included construction of a 230 kV line, three Entergy feeders and one feeder serving the
Coahoma Electric Power Association.
This project represents an investment of more than $6.3 million.
Bozeman Road substation: This facility went into service in 2007 and represents an investment $14
million. This substation provides an additional distribution source in the area west of Madison to
accommodate residential load growth.
McComb capacitor bank: This equipment upgrade also went into service in 2007 and represents a
$750,000 investment. It provides voltage support and reactive power management in the McComb area.
Plum Point third transformer: Adding this transformer provides additional distribution capacity in Desoto
County. This project represents an investment of more than $2 million.
Grants Ferry add second transformer: Provides additional distribution capacity along Lakeland Drive
towards Brandon in Rankin County. This represents approximately $1.2 million invested.
Getwell substation - second transformer: Provides additional distribution capacity in Desoto County near
Hernando. Investment of $5.3 million.
Natchez D-VAR units: Two dynamic VAR units regulate and stabilize voltage levels by injecting dynamic
reactive power into the power grid at precise locations where voltage problems can occur. These two
units automatically control local transmission voltage during contingencies and restore voltage to an
acceptable level.
Entergy Mississippi chose this technology because it was field proven at locations in Entergy’s Louisiana
and Texas operating companies.
These units went into service in 2008 and represent a $10 million investment in improved reliability.
Liberty – Gillsburg 115 kV transmission line: This upgraded transmission line, completed in 2008,
represents an investment of $7 million. It improves transmission flow between Entergy Mississippi and
Entergy’s Louisiana operating company and illustrates the systemic nature of the 15,500 mile
transmission system which is interconnected across four states.
2009 – 2011
Liberty – Gloster 115 kV transmission line: This upgraded transmission line went into service recently
in May. This project, an investment of more than $4 million, is associated with the equipment upgrades at
the Natchez substation.
Indianola – Greenwood 115 kV transmission line: This transmission reliability improvement project is
scheduled to be in service next year. Investment in this project should be approximately $250, 000.
Sunnybrook substation and radial 115kv transmission line: This $28 million project, slated to go into
service in 2011, will provide additional distribution capacity to serve commercial and residential growth in
the Ridgeland area.
2012 – 2013
Granada/Winona/Greenwood improvement project: Five 115 kV lines serve the Greenwood, Winona
and Grenada area in north central Mississippi. Under several single contingency scenarios, including loss
of the 230/115kV auto transformer at Tillatoba and/or the loss of the Tillatoba to Grenada 115kV line,
various substations in this area would have low voltages. This project will address those potential voltage
losses. The investment in this reliability improvement is expected to be about $44 million. The scheduled
in service date is 2012.
Church Road substation and 11.3 mile 230 kV transmission line: Building this new substation and
transmission line will provide additional distribution capacity to support residential and commercial load
growth south of Horn Lake. The project is scheduled to go into service in 2012 and is projected to require
an investment of approximately $ 33.8 million.
Ray Braswell – Wyndale 115 kV transmission line: This project will improve the reliability of the 115kV
line from South Jackson to Brookhaven by adding a new power source south of Byram. It will also provide
additional distribution capacity to support residential, commercial, and industrial load growth between
Jackson and Brookhaven.
The investment value of this project is expected to be about $45 million.
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