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 eight thousand 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
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 (Mo PSC).
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.
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.
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.
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
Limestone Ridge Project
The Limestone Ridge Project includes the construction of a new, 138-kV transmission line and connects two substations in Perry and Cape Girardeau Counties.
Metro South Reliability Project
Ameren Missouri is rebuilding approximately 10 miles of 138,000-volt transmission line in St. Louis County and in the City of St. Louis.
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
Logan County Connector Project
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 Reliability Project
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.
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.