The Mark Twain Transmission Project is classified as a multi-value project (MVP) in the MISO 2011 expansion plan. The project will create a 345-kV path through central and eastern Missouri, beginning at the Iowa state line, continuing to the Zachary substation near West Adair, and continuing to the Maywood substation near Palmyra.
| Project Sponsor | Line Miles | Voltage (kV) | From State | To State | Year in Service |
|---|---|---|---|---|---|
| Ameren Transmission Company | 96 | 345 | IA | MO | 2020 |
| Estimated Costs ($M) | Voltage Type | Project Status | Project Group | Origin Point | Destination Point |
| 250 | Single | Operating | GRP | Iowa/Missouri State Line | Maywood |
| Interstate | Build Start | NERC | ISO/RTO | Country | Project Partners |
| No | 2018 | MRO | MISO | US |
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