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 8,400 transmission miles across a variety of energy markets. We’ve had tremendous success developing and building transmission projects that deliver reliable, resilient and low-cost 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 a balanced mix of generation sources for customers across the country.
Projects in Illinois
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.
Illinois Valley Reliability Project
Ameren Transmission is proposing the Illinois Valley Reliability Project to improve energy reliability for communities in Bureau and LaSalle counties.
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.
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.
Projects in Missouri
Eastern Missouri Grid Transformation Project
The Eastern Missouri Grid Transformation Project includes more than 130 miles of new and upgraded transmission lines. The vast majority of the lines will be rebuilt along existing corridors and co-located with existing Ameren facilities.
Grand Tower Crossing Project
On Feb. 5, 2026, the Missouri Public Service Commission approved a final route and issued a Certificate of Convenience and Necessity for the Grand Tower Crossing Project.
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.
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.
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.
LaSalle Link Project
The 11-mile, 138 kV transmission line and upgraded substations are designed to reduce the frequency and duration of power outages for residents and businesses. The project also supports the expansion needed for continued growth in the area.
Peoria County Reliability Project
The 5-mile, 138 kV transmission line and upgraded substations are designed to reduce the frequency and duration of power outages for residents and businesses. The project also supports the expansion needed for continued growth in the area.