Mississippi Power seeks approval for three transmission projects

Mississippi Power Company (MPC) on Oct. 15 filed with the Mississippi Public Service Commission a petition seeking approval to build, acquire, extend, operate, and maintain three transmission projects.

MPC said that as part of its regular planning, it identifies transmission system improvements needed to provide load growth opportunities, maintain and enhance reliability performance, interconnect and provide transmission service for new generation resources, or otherwise respond to physical or regulatory constraints.

The company said that it has identified three such projects and seeks commission approval to build, acquire, extend, operate, and maintain the transmission and related facilities, as well as rights of way (ROWs) necessary to complete the projects:

  • BP Amoco-Moss Point East 115-kV transmission line project
  • Meridian 115-12.47-kV project
  • Camp Shelby service improvement project

Each project is necessary to continue providing reliable service to customers and would serve the public interest, the company said.

The BP Amoco-Moss Point East project – which is expected to be completed in 2020 – would involve installing additional transmission capacity on MPC’s 115-kV transmission system serving the area along Highway 611 south of Highway 90 in Pascagoula. The company added that it currently faces several operations and maintenance issues in that area, and the unusual load profile around Pascagoula, Miss. – due to the heavy influence of industrial load, which diminishes the area’s load diversity – complicates the routine maintenance typically conducted during non-peak load times in other areas.

In short, the company said, the additional capacity provided by the project is necessary for MPC to relieve line overloads, as well as operate and maintain its transmission system in compliance with transmission operating standards set forth by NERC.

In order to minimize the risk of load shed and to ensure reliability during necessary maintenance, the company requests approval for the construction of about two miles of 115-kV transmission line, a new 115-kV line terminal, and a 3-way 115-kV line switch. MPC added that the cost to design and build that project is estimated to be about $7.9m.

The company noted that it has not yet acquired all real property necessary to build the proposed facilities, and contemplates that it may be necessary to exercise the right of eminent domain in order to build the project. The final location of the line substation facilities would depend upon terrain, accessibility, and engineering feasibility, MPC said.

The Meridian project contemplates the construction of a new substation equipped with transformation capacity and configured to provide 12.47-kV service to new and existing customers in and around Meridian, Miss.

The company added that the purpose of the project is to provide capacity for serving additional electric load in the Meridian area, to reduce the loading on the Meridian NE substation, and to provide contingency to the Meridian NE substation, as well as the distribution system that it serves.

MPC said that it has previously acquired the real property for the proposed substation site, and now only requests approval for its construction. The cost to design and build the project is estimated to be about $5.2m, the company said, adding that the project is expected to be completed in 2019.

Of the South Hattiesburg Area and Camp Shelby Service Improvement Project, MPC said with the construction of little more than one mile of new transmission line, it would be able to provide more reliable network service in the south Hattiesburg area. That project was identified in response to the 2017 Hattiesburg tornado and would provide important backup service to Camp Shelby, as well as several substations nearby, the company said.

MPC noted that it estimates that it would cost about $2.2m to design and build the project, with construction expected to be completed by August 2020. The company said that it has not yet acquired all real property necessary to build the proposed facilities, and contemplates that it may be necessary to exercise the right of eminent domain in order to build the project.

Among other things, MPC said that the construction of the new facilities and acquisition of the ROWs would not have a material impact on its rate base and rates.

About Corina Rivera-Linares 3058 Articles
Corina Rivera-Linares, chief editor for TransmissionHub, has covered the U.S. power industry for the past 15 years. Before joining TransmissionHub, Corina covered renewable energy and environmental issues, as well as transmission, generation, regulation, legislation and ISO/RTO matters at SNL Financial. She has also covered such topics as health, politics, and education for weekly newspapers and national magazines. She can be reached at clinares@endeavorb2b.com.