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Project Update

Lake Charles Transmission Line Project, US [free access]

November 5, 2018

Developer: Entergy Gulf States Louisiana, a subsidiary of Entergy Corporation


Project details and status: The USD181 million project is located in the Lake Charles area of southwest Louisiana and was proposed to address the future load growth and reliability needs in the region. The project was completed in October 2018.


It involved the construction of a 500 kV switching station (located east of the Nelson generating station) and a new 500 kV bulk substation, along with the installation of a new 500/230 kV, 1,200 MVA autotransformer at the latter substation. In addition, it included approximately 10 miles (16.1 km) of new 500 kV transmission line from the new switching station to the new bulk substation, approximately four miles (6.44 km) of 230 kV transmission line from the bulk substation to the existing 230 kV Carlyss substation, and around 12 miles (19.3 km) of new 230 kV transmission line between the Carlyss and Graywood substations.


The board of directors of Midcontinent Independent System Operator (MISO) approved the project in April 2015.


During January 2016, Louisiana Public Service Commission (PSC) adopted the settlement agreement that endorsed the Lake Charles Transmission Project in southwest Louisiana as ‘in the public interest’. Following this, the construction works for the project were initiated in March 2016.


It is one of the three resiliency projects recently completed by Entergy Louisiana in 2018; the other two are the Oakville–Alliance and the Terrebonne–Bayou Vista transmission projects. The former included rebuilding and expansion of the Oakville substation, and construction of a 230 kV transmission line between Entergy Louisiana’s existing substations in Jefferson Parish and Plaquemines Parish.