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Selective Transmission Projects Western Region Economic Project
 

Selective Transmission Projects

Western Region Economic Project

Grimes, Rocky Creek, or Quarry to Lewis Creek 230 kV Transmission Line Project
(Montgomery and potentially Grimes and Walker Counties)

Southeast Texas' population and economic opportunities are growing year by year. To support this growth, Entergy Texas, Inc. has launched a project designed to bring additional power to one of the fastest growing areas in Texas. The Western Region Economic Project calls for the construction of a new transmission line, the upgrade of an existing line and the facilities to support both of them. It also includes upgrades and expansion of an existing substation(s). The work will support and enable economic growth in Southeast Texas as well as enhance reliability for existing and future customers.

This 230 kV transmission line project is part of the Western Region Economic Project. The Midcontinent Independent System Operator, Inc. (MISO), in conjunction with Entergy Texas' transmission engineers and planners and other interested stakeholders, ensures that Entergy's transmission system will continue to reliably and cost effectively serve its customers, both now and into the future. MISO identified the need for the Western Region Economic Project as part of the MISO 2015 Market Congestion Planning Study. The purpose of this project is to upgrade the electric transmission system to more effectively move lower cost power into and within the southeast Texas area for all customers served from ETI's transmission system. Similar to cars driving in the same direction on a congested road in rush hour traffic, the transmission system can become congested when more power than is allowed by the capacity of the transmission lines tends to flow in the same direction through these transmission lines. Much like the construction of an additional highway can help to reduce traffic congestion, incremental additions to the transmission infrastructure can help reduce the congestion on the transmission system and facilitate economic power to flow through the transmission grid.

The Western Region Economic Project involves two geographically separate transmission projects:

1. The western portion of the project involves construction of one new 230 kV transmission line by mid-2020 between the Lewis Creek Substation near Willis, Texas and one of the following endpoint options:

1. the Grimes Substation near Shiro, Texas;
2. a new Rocky Creek Substation west of Huntsville, Texas; or
3. a new Quarry Substation north of Huntsville, Texas

2. The eastern portion of the project involves an upgrade to an existing 138 kV line between Entergy Texas' existing Newton Bulk Substation near Newton, Texas, and existing Leach Substation near South Toledo Bend by mid-2019.

The new 230 kV transmission line will provide a power path to help alleviate congestion on several lines in the southeast Texas transmission system. In addition to reducing congestion, the project will help bolster the reliability of the Southeast Texas transmission system, including increasing the operational flexibility during maintenance outages and enhancing reliability during hurricanes and other large storm events.

The two projects consist of the following:

1. Construction of one new 230 kV transmission line between: (1) the Grimes Substation and the Lewis Creek 230 kV Substation; or (2) the Rocky Creek Substation and the Lewis Creek Substation; or (3) the Quarry Substation and the Lewis Creek Substation.
2. Expansion of the existing Grimes Substation near Shiro, Texas to add new 230 kV infrastructure, new 345 kV infrastructure, and a new bank of 345/230 kV autotransformers.
OR

Construction of a new Rocky Creek Substation near Huntsville, Texas to add new 230 kV infrastructure, new 345 kV infrastructure, and a new bank of 345/230 kV autotransformers.
OR
Construction of a new Quarry Substation north of Huntsville, Texas to add new 230 kV infrastructure, new 345 kV infrastructure, and a new bank of 345/230 kV autotransformers.
3. Expansion of the existing Lewis Creek 230 kV Substation near Willis, Texas to add new 230 kV infrastructure.
4. Upgrades to an existing 138 kV transmission line between the existing Newton Bulk Substation near Newton, Texas and the existing Leach Substation near South Toledo Bend, Texas with a larger conductor to improve power flow.

Entergy Texas is considering a number of alternative route segments for the new 230 kV transmission line between the Lewis Creek substations and the endpoint options listed above. These route segments are available in the landowner notice maps provided below. Additionally, a link to a detailed map is provided below.

All routes and route segments currently under review by ETI which are included under the "Current Versions of Landowner Notice Map" may be available for selection and approval by the Public Utility Commission of Texas (PUCT) upon ETI filing its application, including any modified route segments, with the PUCT. If approved, only one route will be selected by the PUCT. The current anticipated filing date is Mid-Year 2017.

Current Versions of Landowner Notice Map Prior Versions of Landowner Notice Map
>>Interactive Project Map

>>Landowner Notice Map 1

>>Landowner Notice Map 2

>>Landowner Notice Map 3

>> Landowner Notice Map 1 - May 26, 2016

>> Landowner Notice Map 2 - May 26, 2016

>> Landowner Notice Map 1 - July 20,2016

>> Landowner Notice Map 2 - July 20,2016

>>Typical Structures