Transmission at Ameren
Ameren Transmission is dedicated to developing transmission infrastructure investments throughout the nation.
Innovative, Customer Focused and Safety Top of Mind
We have a proven track record of planning, constructing and safely operating over 8,000 transmission miles across a variety of energy markets. We’ve had tremendous success developing and building transmission projects that deliver clean, affordable and reliable energy to communities across the Midwest. Building on that success, Ameren Transmission is exploring opportunities to develop projects that will enhance reliability, improve system performance and increase access to more diverse generation sources for customers across the country.
Ameren Transmission Projects
Central Illinois Grid Transformation Program
The Central Illinois Grid Transformation Program includes approximately 380 miles of new or upgraded transmission line across central Illinois with the vast majority to be rebuilt along existing corridors and co-located with existing Ameren Illinois facilities.
Grand Tower Crossing Project
On May 1, 2025, after careful consideration of feedback from landowners, community members, interested agencies and local officials, ATXI has selected and filed a Final Proposed Route with the Missouri Public Service Commission (MoPSC).
Illinois Valley Reliability Project
Ameren Transmission is proposing the Illinois Valley Reliability Project to improve energy reliability for communities in Bureau and LaSalle counties.
Mt. Vernon Area Reliability Project
The Mt. Vernon Area Reliability Project is the first project in a larger portfolio of energy projects called the South Central Illinois Transmission Expansion (SCITE) Program.
Northern Missouri Grid Transformation Program
Ameren Transmission Company of Illinois (ATXI), Missouri Joint Municipal Electric Utility Commission (MJMEUC) and Ameren Missouri are working together to build a more reliable and resilient energy grid for the future.
Sursee-Aviston Transmission Project
Ameren Transmission Company of Illinois (ATXI), in collaboration with the City of Highland, is developing the Sursee-Aviston Transmission Project to improve energy reliability for local customers in Madison, Clinton and St. Clair counties.
Missouri Projects
Montgomery-Callaway Connector Project
Ameren Missouri is proposing the Montgomery-Callaway Connector Project located in central Missouri. The Project includes approximately 30 miles of double circuit, 345 kV transmission line in Montgomery and Callaway counties.
Illinois Projects
Knox County Connector Project
Ameren Illinois is proposing the Knox County Connector Project located in Knox County, Illinois including approximately 11 miles of new and upgraded energy lines with a vast majority to be rebuilt along existing corridors and co-located with existing Ameren Illinois facilities.
LaSalle Link Project
Ameren Illinois is proposing the LaSalle Link Project including the construction of a new, 11-mile, 138-kV transmission line to connect the Corbin substation in Oglesby, Illinois to the North Utica substation near North Utica, Illinois. Our goal is to have this new line in service and providing benefits to the local community in early 2026.
Peoria County Reliability Project
Ameren Illinois is proposing the Peoria County Reliability Project and includes the construction of a new, 138-kV transmission line to connect the existing Alta substation in Peoria County, Illinois to the existing Pioneer substation in the City of Peoria.
Completed Projects
Illinois Rivers
The 375-mile, 345-kV Illinois Rivers Project provides greater energy reliability, increased transmission capacity and lower-cost energy from renewable sources for Midwestern families and businesses. The transmission line extends from Palmyra, Missouri, to Sugar Creek, Indiana.
Mark Twain
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.
Spoon River
The Spoon River Transmission Project is directly aligned with our strategic goals of providing customers with clean, reliable and affordable energy.
Limestone Ridge
The Limestone Ridge transmission line is improving system reliability and providing additional energy support for local manufacturing facilities. It also allows for efficient future expansion of the energy grid.
Metro South Reliability Project
The Metro South line was be rebuilt on existing right-of-way and will connect the Watson Substation to the Lemay Substation, and cross the Mississippi River to a final destination in Dupo, Illinois. The rebuilt line will improve grid reliability, meet local energy needs, and promote cleaner energy sources.
Logan County
Ameren Illinois has completed and energized the Logan County Connector Project. The new, approximately 9-mile 138-kV transmission line and associated facilities are improving reliability for local customers in central Illinois.
Southern Illinois
Ameren Illinois has completed and energized the Southern Illinois Reliability Project. The 140 miles of rebuilt, 345-kV line is providing greater energy reliability, more access to renewable energy and has increased transmission capacity across seven counties in southern Illinois.