Construction began on Feb. 6 on Entergy Louisiana’s $100m technological upgrade to its electric power transmission grid in Jefferson Davis Parish, Entergy (NYSE:ETR) said, noting that the project will enhance reliability, increase transmission capacity, and help ensure the availability of affordable power.
The upgrade covers about 900 square miles, almost all of which is within the parish, and encompasses the construction of some new transmission lines, as well as rebuilding existing lines, the company said.
The new and rebuilt sections of line will use steel structures that can withstand winds of up to 140 miles per hour and employ reinforced high-voltage wire that will move power more reliably and efficiently, the company said.
An Entergy spokesperson on Dec. 12, 2017, told TransmissionHub that there are multiple new lines and existing lines that will be rebuilt as part of the Southwest Louisiana 69kV Improvement Project.
“We will be replacing the existing Colonial Welsh [138-kV] tap line with two new [138-kV] lines (Henning-Lake Charles Bulk and Henning-Bayou Cove),” he said. “We will be installing a new [69-kV] line between the new Henning Substation and the existing Carter Substation. We will also be rebuilding the existing Carter-Serpent and Compton-Elton [69-kV] lines. Finally we will be installing two new [69-kV] lines from the new Henning Substation to the Line 13 Tap location.”
The hub of the project will center around the new Henning substation, the company said in its Dec. 4, 2017, statement, adding that most of the construction will take place between the Compton and Elton substations along Louisiana Highway 395, across farm fields between the Carter and Serpent substations, and along Louisiana Highway 90 between the Derouen and Lawtag substations.
Construction of the lines began along Highway 395 between Grand Marais Road and Doise Road, Entergy noted in its Feb. 5 statement, adding that in total, the project will add or upgrade more than 58 miles of transmission and distribution lines.
Depending upon weather and other variables, the project will conclude by February 2020, the company said.
Noting that it has identified a few locations that will require brief service interruptions as a result of the project, Entergy said that it will provide advance notice to all affected customers so that they can plan accordingly.
Work also begins on $69m upgrade
Separately, Entergy said that Entergy Louisiana on Jan. 2 began work on the second phase of construction of a multi-phase, $69m upgrade to the electric transmission infrastructure along the Lapalco Boulevard corridor on the West Bank of Jefferson Parish from Bayou Segnette to Harvey.
Melonie Stewart, director of customer service with Entergy, said in the company’s Jan. 2 statement that the project will enhance reliability and help ensure the availability of affordable power.
The project, which began with preliminary activities in July 2017, will replace all of the existing wooden H-frame structures with new single-pole steel structures, and the existing 115-kV transmission lines with a new high-voltage wire allowing more power to move more reliably and efficiently, Entergy said. The use of advanced technology will provide added capacity and will allow Entergy to upgrade the lines without having to replace the existing steel lattice structures along Lapalco, the company noted.
The new structures will be built to withstand winds of up to 150 mph, creating a stronger and more resilient transmission system, Stewart said.
Entergy said that Entergy Louisiana will complete the projects – Ninemile-Westwego, Ninemile-Harvey and Ninemile-Barataria – in three phases originating at the Entergy Ninemile Point Plant and ending at the three different West Bank substations – Westwego, Harvey and Barataria.
The first phase of the project, along the Ninemile corridor, began work in September 2017, Entergy said. The second phase will be completed by June, while the third and final phase of the Ninemile-Westwego and Ninemile-Harvey projects – which includes work along the Central Avenue and the Lapalco corridor to the Harvey substation, respectively – is scheduled to start in February and finish by June, the company said. Phase three of the Ninemile-Barataria project, which rebuilds a portion of the transmission line through the Barataria marsh, will begin in the fall and be completed by spring 2019, Entergy said.