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 more access to low-cost energy for Midwestern families and businesses. The transmission line extends from Palmyra, Missouri, to Sugar Creek, Indiana.
Mark Twain
The 96-mile, 345 kV transmission line and substation located northeast Missouri is strengthening the energy grid and providing more access to low-cost energy for Midwestern families and businesses.
Spoon River
The 44-mile, 345 kV transmission line between Galesburg and Peoria in Illinois is improving electric system reliability, providing greater access to low-cost sources of energy and supporting increased capacity on the transmission system.
Limestone Ridge
The 15-mile, 138 kV transmission line and state-of-the-art substations are improving energy reliability for communities in southeast Missouri and providing support for local manufacturing facilities.
Metro South Reliability Project
Approximately 10 miles of reconstructed 138 kV transmission lines are supporting a more reliable and resilient energy grid for St. Louis area customers. The project also included the construction of two 294 feet tall transmission towers spanning the Mississippi River.
Logan County
The approximately 9-mile, 138 kV transmission line and associated facilities are improving reliability and providing additional pathways to support growing energy needs for customers in central Illinois.
Southern Illinois
The 140 miles of rebuilt, 345 kV transmission line provides greater energy reliability, more access to low-cost energy and increased transmission capacity across seven counties in southern Illinois.