Entergy Mississippi seeks regulatory approval to upgrade 500 kV substation
Entergy’s Entergy Mississippi, LLC (EML) on 25 May filed petition with the Mississippi Public Service Commission.
Image source: T&D World
USA, Mississippi, Franklin: Entergy’s Entergy Mississippi, LLC (EML) on 25 May filed petition with the Mississippi Public Service Commission.
The company petitioned for a certificate of public convenience and necessity (CCN) to expand and upgrade its Franklin 500 kV substation to a breaker-and-a-half bus scheme. EML noted that it seeks a CCN to acquire, build, expand, own, operate, and maintain certain electrical facilities, including:
- Acquiring 10 acres to expand the Franklin substation
- Expanding 500 kV bus to the west as required
- Installing 500 kV low and high elevation bus, switch, arrestor, and capacitive coupling voltage transformer supports as required
- Installing one 500 kV line dead-end including foundations just outside of the Franklin substation
- Installing two 500 kV circuit breakers and associated devices and equipment
- Relocating existing conductor to new McKnight 500 kV line bay
- Replacing breakers J2416 and J2412 and associated devices and equipment
- Installing all related switches, arrestors, CCVTs, line traps, and control panels
- Removing identified line panels and associated devices and equipment
The company said that it is proposing the project, located in Franklin County, Miss., in order to maintain compliance with the NERC mandatory reliability standards and to continue delivering reliable electrical service to its customers in the southwestern region of its service area.
EML noted that the proposed electrical facilities were identified as a solution to some identified potential transmission system limitations in the Midcontinent ISO (MISO) Transmission Expansion Process (MTEP).
The company said that its fibre-optic network would also be extended from the Franklin substation to Entergy Louisiana, LLC’s McKnight 500 kV substation in Louisiana. The upgrades at the Franklin substation would require upgrades to the relay protection and communication systems equipment located at the McKnight substation, which is located at the remote end of the Franklin to McKnight 500 kV line and contains remote end relaying and protection equipment affecting the Franklin substation.
Among other things, the company said that the total cost of the proposed facilities is estimated to be $13.8 M, and that subject to the receipt of necessary permits and required approvals, the project is planned with an in-service date of December 2022.
Source: T&D World