Ameren Transmission Company of Illinois (ATXI) is pleased to announce we have completed and energized the Mark Twain Transmission Project, a 96-mile, 345 kV transmission line and substation located in northeast Missouri. The project was placed into service as expected on Dec.19, 2019. The project strengthens energy grid reliability and provides greater access to renewable energy sources for Missouri families and businesses. The Mark Twain Transmission Project has helped enable wind projects under development in Missouri that will provide lower cost energy to the grid, allowing the benefits of this project to far exceed the project costs.