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Mark Twain Transmission Project
On May 29, 2015, ATXI filed an application with the Missouri Public Service Commission, to obtain a Certificate of Convenience and Necessity for the Mark Twain Transmission Project, in the event the Commission determined that a Certificate was necessary for ATXI to construct the project. The application includes the 345,000 volt and 161,000 volt line segments as well as the Zachary Substation.

For additional information, please see the Missouri Public Service website at and reference case number EA-2015-0146.
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The final route decision for the Mark Twain Transmission Project has been determined. Landowners impacted by the planned route have been notified by letter. Designing a transmission line takes a team effort and most importantly the input of the same community. Our final route selection has been based on data collected form state and local sources as well as the input received from the public. Our public outreach efforts included:

Public open houses

A project website with an online survey

Comments collected from area residents and stakeholders via our hotline and email address

Individual meetings with potentially impacted land owners

Meetings with public officials over several months
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This project will help reduce transmission congestion and provide utility customers in Missouri with greater access to low-cost energy, including wind energy; improve power reliability; create approximately 200 new construction jobs and help the state of Missouri meet the voter-approved Renewable Energy Portfolio Standard (RPS).

The new 345,000-volt transmission line will run from Palmyra to Kirksville and then north to the Iowa border. The new line will be about 100 miles in length. The project also includes construction of the new Zachary Substation at Kirksville and is scheduled for completion in 2018.

The Mark Twain Project is one of several MISO (Mid-continent Independent System Operator) Multi-Value Projects approved in 2011. ATXI now will submit the planned Mark Twain Transmission Project to the Missouri Public Service Commission (PSC) for review and approval.

161 kV Connector
In order to bring electricity from the Mark Twain Transmission Line Project to utility customers, it is necessary for Ameren Transmission Company of Illinois (ATXI) to build a 161,000-volt (161 kV) connector transmission line from the existing Adair Substation to the Zachary Substation at Kirksville. This connector transmission line will be approximately 2.5 miles in length. Read more.
Hotline: 888.340.6640
Mail: Mark Twain Transmission Project
         c/o Burns & McDonnell
         Kasey Randle-Biehler
         9400 Ward Parkway
         Kansas City, MO 64114

Mark Twain Transmission Project


New transmission line from Palmyra to Kirksville and then north to the Iowa border
Length: Approximately 100 miles
In-service date: 2018
Voltage: 345,000 volts
Structures: Single-shaft steel poles
Easement width: 150 feet
MISO Multi-Value Project (MVP)

   Ameren Transmission
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