Mark Twain Transmission Project

The county commissions in Adair, Knox, Lewis, Marion and Schuyler counties have granted assents for the Mark Twain Transmission Project, a 345,000-volt transmission line and substation to be built in northeast Missouri. After listening to landowners, community members, county commissioners and other local and state representatives, Ameren Transmission Company of Illinois (ATXI) collaborated with Northeast Missouri Electric Power Cooperative (Northeast Power) and Ameren Missouri to co-locate the 96-mile line on nearly 100 percent of existing right of way. We are grateful for the county approvals and the community feedback we received, which helped shape and determine the final route.

The route will run through Adair, Knox, Lewis, Marion and Schuyler counties and includes construction of the Zachary Substation adjacent to the existing Adair Substation in Adair County. Specifically, the route will co-locate along existing right of way on Northeast Power’s 161,000-volt line between Palmyra and Kirksville and Ameren Missouri’s 161,000-volt line from Kirksville to the Iowa border. In Marion County, the line will follow the lime segment. In Adair County, the route will run along the purple segment. The decision to use the lime and purple segments was based on county commission approval and feedback we received from landowners and community members. Please see the map of the final route selection.

Project benefits include:

Improved electric system reliability

Improved access to renewable sources of energy

Regional and local growth in northeast Missouri

New annual tax revenue to northeast Missouri to support communities in the five counties where the line will be located

Improved transmission capacity

Contact Us
Hotline: 888.340.6640
Mail: Mark Twain Transmission Project
         c/o Burns & McDonnell
         Jen Berry
         9400 Ward Parkway
         Kansas City, MO 64114

Quick Facts
New transmission line from Palmyra to Kirksville and then north to the Iowa border
Length: Approximately 96 miles
In-service date: 2019
Voltage: 345,000 volts
Structures: Single-shaft steel poles (double circuit) minimal double dead-end steel poles
Easement width: 150 feet
MISO Multi-Value Project (MVP)


   Ameren Transmission


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