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Central Illinois Grid Transformation Program

Central Illinois Grid Transformation Program Website
  • Proposed Route
  • Blue Option
  • Pink Option
  • Orange Option
  • Purple Option
  • The green line on the map is the Proposed Route filed with the ICC. We will only be constructing one of the route options in McDonough and Adams counties. Click on your county on the map to learn more.

Hancock County

Overview

The Proposed Route includes approximately 24 miles of upgraded transmission lines with the majority along existing corridors.

Map

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Download Mapbook (PDF)

Structure Snapshot

Two side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 showcases the existing 138 kV wooden monopole, with an average height of 40-85ft and average span length between 100-500ft. Structures per mile averages between 9-12 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 2 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

McDonough County

Overview

The Proposed Route includes two options (pink or blue) to build a new, 138 kV and 345 kV double circuit north of the City of Macomb. We will only be constructing one of these routes for the line. A 138 kV connector line (pink and grey dashed line) will be built to connect back into existing substations serving the Macomb area.

Map

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Download Mapbook (PDF)

Structure Snapshot

Three side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows the existing 138 kV wooden monopole, with an average height of 60ft and average span length between 100-500ft. Structures per mile averages between 9-12 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 2 shows the existing 138 kV wooden H-frame, with an average height of 40-80ft and average span length between 300-800ft. Structures per mile averages between 9-12 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 3 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Fulton County

Overview

The Proposed Route has approximately 42 miles of upgraded transmission lines along existing corridors.

Map

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Download Mapbook (PDF)

Structure Snapshot

Four side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows a 345 kV lattice structure with an average height of 120-180ft and average span length between 900-1300ft. Structures per mile averages between 4-6 miles with a conductor clearance of 25ft minimum. 
                                                  
                                                  Graphic 2 shows a 345 kV lattice H-Frame with an average height of 60-95ft and average span length between 700-1100ft. Structures per mile averages between 5-7 miles with a conductor clearance of 25ft minimum. 
                                                  
                                                  Graphic 3 shows the existing 138 kV wooden H-frame, with an average height of 50-85ft and average span length between 300-700ft. Structures per mile averages between 8-10 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 4 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Peoria County

Overview

The Proposed Route has approximately 12 miles of upgraded transmission lines on existing structures to carry additional energy.

Map

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Download Mapbook (PDF)

Structure Snapshot

Two side by side structure graphics showing the existing structures for the county. Individual structure replacements may be required based upon inspection of existing structures and final design parameters.  Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows a 345 kV lattice structure with an average height of 130-190ft and average span length between 1000-1200ft. Structures per mile averages between 4-6 miles with a conductor clearance of 25ft minimum. 
                                                  
                                                  Graphic 2 shows the existing 69/345 kV steel monopole, with an average height of 120-180ft and average span length between 800-1300ft. Structures per mile averages between 4-6 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Tazewell County

Overview

The Proposed Route has approximately 40 miles of new and upgraded transmission lines in Tazewell County.

Map

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Download Mapbook (PDF)

Structure Snapshot

Four side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows a 138/345 kV lattice structure with an average height of 120-165ft and average span length between 800-1300ft. Structures per mile averages between 4-6 miles with a conductor clearance of 25ft minimum. 
                                                  
                                                  Graphic 2 shows the existing 138 kV steel monopole, with an average height of 80-100ft and average span length between 500-800ft. Structures per mile averages between 8 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 3 shows the existing 138 kV wooden H-frame, with an average height of 50-85ft and average span length between 300-700ft. Structures per mile averages between 8-10 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 4 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

McLean County

Overview

The Proposed Route has approximately 50 miles of new and upgraded transmission lines in McLean County.

Map

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Download Mapbook (PDF)

Structure Snapshot

Three side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 showcases the existing 138 kV steel monopole, with an average height of 80-110ft and average span length between 500-900ft. Structures per mile averages between 8 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 2 shows the existing 138 kV wooden H-frame, with an average height of 50-110ft and average span length between 400-700ft. Structures per mile averages between 9-12 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 3 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Ford County

Overview

The Proposed Route has approximately 27 miles of upgraded transmission lines with the majority along existing corridors.

Map

Click to enlarge

Download Mapbook (PDF)

Structure Snapshot

Two side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows the existing 138 kV wooden H-frame, with an average height of 35-110ft and average span length between 400-700ft. Structures per mile averages between 8-12 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 2 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Iroquois County

Overview

The Proposed Route has approximately 50 miles of new or upgraded transmission lines with the majority along existing corridors.

Map

Click to enlarge

Download Mapbook (PDF)

Structure Snapshot

Three side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows the existing 138 kV wooden monopole, with an average height of 35-95ft and average span length between 100-400ft. Structures per mile averages between 18-22 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 2 shows the existing 138 kV wooden H-frame, with an average height of 60-120ft and average span length between 600-800ft. Structures per mile averages between 7-9 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 3 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Champaign County

Overview

The Proposed Route has approximately 26 miles of upgraded transmission lines with the majority along existing corridors.

Map

Click to enlarge

Download Mapbook (PDF)

Structure Snapshot

Two side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows the existing 138 kV wooden H-frame, with an average height of 50-110ft and average span length between 400-700ft. Structures per mile averages between 9-12 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 2 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Adams County

Overview

The Proposed Route has two options (purple or orange) to allow for the installation of a new, 345 kV circuit. We will only be constructing one of these routes for the line. These options allow for consideration of constructing the new line with double-circuit structures and relocating portions of the existing 138 kV circuits along the new corridor to allow for additional distance from the Quincy Regional Airport.

Map

Click to enlarge

Download Mapbook (PDF)

Structure Snapshot

Two side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.  

                                                  Graphic 1 shows the existing 161 kV/138 kV wooden H-frame, with an average height of 40-80ft; average span length between 100-500ft. Structures per mile averages between 9-12 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 2 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Brown County

Overview

The Proposed Route has approximately 20 miles of upgraded transmission lines with the majority along existing corridors.

Map

Click to enlarge

Download Mapbook (PDF)

Structure Snapshot

Two side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows the existing 138 kV wooden H-frame, with an average height of 40-110ft and average span length between 300-700ft. Structures per mile averages between 9-12 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 2 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Pike County

Overview

The Proposed Route has approximately 2 miles of new transmission lines. The new 345 kV circuit will be constructed in a new corridor to connect separate existing transmission corridors to utilize existing structures to cross the Illinois River.

Map

Click to enlarge

Download Mapbook (PDF)

Structure Snapshot

Two side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows the existing 138 kV wooden H-frame, with an average height of 40-200ft and average span length between 300-900ft. Structures per mile averages between 9-12 miles with a conductor clearance of 21ft minimum. 
                                                  
                                                  Graphic 2 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Morgan County

Overview

The Proposed Route has approximately 2 miles of new transmission lines.

Map

Click to enlarge

Download Mapbook (PDF)

Structure Snapshot

Two side by side structure graphics showing the existing structures and anticipated new structures for the county. Graphics are intended for information purposes only and are not to scale. New structure designs, including number of arms and type of foundation may vary depending on final route, soil conditions, circuit design, and presence of distribution.
                                                  Graphic 1 shows the existing 138 kV steel monopole, with an average height of 110ft with a conductor clearance of 21ft minimum. 
               
                                                  Graphic 3 shows the anticipated new structure as a 138/345 kV weathering steel monopole with an average height of 80-140ft and average span length between 800-1100 ft. Structures per mile averages between 5-8 miles with a conductor clearance of 25ft minimum.

Click to enlarge.

Program Overview and Benefits

Ameren Transmission Company of Illinois (ATXI) and Ameren Illinois are working together to build a more reliable and resilient energy grid for the future.

The Central Illinois Grid Transformation Program (Program) includes approximately 380 miles of new or upgraded transmission line through Hancock, McDonough, Fulton, Peoria, Tazewell, McLean, Ford, Iroquois, Champaign, Adams, Brown, Pike and Morgan counties. The program also includes building three new substations and upgrades to several existing substations.

Fulfilling a Need

The program will prepare the grid for the future by replacing aging infrastructure, adding transmission capacity to ensure energy reliability and resiliency, and promoting more access to energy sources for communities.

Program Benefits

  • Increasing transmission capacity to meet changing energy needs.
  • Supporting lower energy supply costs.
  • Improving energy reliability for the surrounding region and local communities.
  • Promoting access to diverse energy sources.
  • Growing economic development opportunities.
Program area across Central Illinois

Click on image to enlarge.


Anticipated Schedule

The program is expected to be in-service in June 2029.

Program schedule

Click on image to enlarge.

Regional Planning Initiative

The Midcontinent Independent System Operator (MISO) is an independent member organization that works with midwestern states and Manitoba, Canada, to ensure reliable, resilient and affordable energy for the region. In July of 2022, MISO's Board of Directors unanimously approved $10.3 billion to improve the ability to move electricity across the MISO region from where it is generated to where it is needed - reliably and at the lowest possible cost. Our program is part of the Tranche 1 Portfolio.

What is Energy Reliability?

Our energy grid is similar to our road system in the way it allows energy from generation sources to travel short or long distances, as needed, at any given moment. On the road, when your main route is closed for construction, you review your options and find an alternative. In some cases, alternatives just don't exist, or they can't handle the increased traffic and users experience backups.

The energy grid is no different! If a large storm were to take out multiple transmission or distribution lines or “routes” in your area, local homes and businesses would be served by a lower capacity which could lead to reliability issues in the area.

With this program we can add more capacity or “alternate routes” to meet the changing needs in your community!

Miso Program Map

Click on image to enlarge.

Did You Know?

Almost the entire Eastern half of the United States is electrically interconnected.

Electricity is generated within our grid from diverse sources and sent onto the transmission system. After the energy is generated, it is transferred along transmission lines to substations. The substations then convert the energy to a lower voltage and send the energy to area homes, businesses and communities through distribution lines where the electricity is needed.

As communities change and our grid evolves, energy sources transition and new sources of energy are developed, substations are built or upgraded to meet the energy demand and expand the system's ability to handle more energy from various points of generation.

Typical New Structures

We anticipate using weathering steel monopole structures. In most instances, the number of structures is lessened with a smaller footprint due to design and longer spans.

Typical New Structures

  • Type: Weathering Steel Monopoles
  • Height: 80-140 ft
  • Average Span Length: 700-900 ft
  • Structures/Mile: 7-8
  • Clearance: 25 ft minimum
  • Foundations: Most structures will be directly embedded into the ground with concrete backfill.

Single Circuit

Single Circuit

Click on image to enlarge.

Double Circuit

Double Circuit

Click on image to enlarge.

Routing Process

Routing a transmission line is a phased process. Throughout the routing process, our team worked with agencies, community members and landowners, to minimize impacts and develop a Proposed Route that was filed with the Illinois Commerce Commission in February 2024.

The goal of the routing process is to take advantage of Opportunities while understanding and minimizing impacts to Sensitivities and adhering to Technical Guidelines and Statutory Requirements.

Use data from publicly available data sources and federal, state and local agencies to create and verify the program area.

Consider existing utility corridors, existing land use, resource areas, natural environment data and field survey data to help minimize impacts while providing a feasible route opportunity.

Create a study area after analyzing and gathering data.

Use data collected from stakeholders and federal, state, and local agencies and the four categories of routing criteria - Opportunities, Sensitivities, Technical Guidelines, and Statutory Requirements - to develop potential Route Corridors.

  • Opportunities
  • Field lines
  • Property lines
  • Section lines
  • Roads
  • Utility corridors
  • Sensitivities
  • Agricultural conflicts
  • Airports/VOR
  • Cemeteries
  • Communication Towers
  • Conservation Areas/Nature
  • Preserves
  • Contaminated Areas
  • Cultural/Historic Resources
  • Planned Development (future)
  • Floodplains (more difficult construction and many times have sensitive species)
  • Forest/Grassland
  • Hospitals
  • IL DNR Resource Lands
  • IL DNR State Parks
  • Karst Areas
  • Levees/Dams
  • Mines/Quarries
  • Pipelines*
  • Railroads*
  • Recreation/Tourism
  • Religious Facilities
  • Residences (especially large clusters of homes)
  • Scenic Roads
  • Schools/Daycares
  • Sensitive Crops
  • Sensitive Species
  • Streams/Wetlands
  • Wells

*Linear features with additional precautions and studies needed.

What is a route corridor? A narrowed area being considered for a transmission line. This is based upon where the line will connect into substations, input gathered during our summer 2023 stakeholder workshops and the opportunities near existing corridors. The route corridor is narrower than the original study area, and wider than the 150-foot right of way that will be needed for the construction, operation, and maintenance of the line.

Using the routing criteria, as well as input received from stakeholders and community members during phase 1 of public engagement, our team developed Preliminary Route Alternatives.

After careful consideration of feedback from landowners, community members, interested agencies, and local officials Ameren Transmission Company of Illinois (ATXI) and Ameren Illinois have selected and filed a Proposed Route with the Illinois Commerce Commission (ICC). That Proposed Route includes options in Adams and McDonough Counties.

Routing Process

Click on image to enlarge.

Agency Coordination

Our team coordinates with federal, state and local agencies regarding protected or sensitive resources within the program area. Sometimes additional permits or approvals from these agencies are necessary for construction:

routing process

U.S. Army Corps of Engineers
Section 404 Clean Water Act Section 10 Rivers and Harbors Act

routing process

U.S. Fish and Wildlife Service
Endangered Species Act, Bald and Golden Eagle Protection Act, and Migratory Bird Treaty Act

routing process

U.S. Illinois Environmental Protection Agency
Section 401 Water Quality Certificate and General NPDES Permit for stormwater discharge from construction site

routing process

Illinois Historic Preservation Agency
Section 106 Cultural Resources Review

routing process

Illinois Department of Transportation
Road permits

routing process

Illinois Department of Natural Resources
State protected natural features and species

routing process

Illinois Department of Agriculture
Agricultural Impact Mitigation Agreement (AIMA)

routing process

Local Permits
Erosion control and road crossing

Real Estate

Ameren's real estate team will have several land agents assisting landowners during the entire real estate process for existing and new corridors.

Landowner Discussions

  • Land surveys and studies
  • Access roads
  • Structure/line design
  • Right-of-way clearing
  • Compensation
  • Property restoration

Easements

The typical total easement width for the new structures is 150 feet. The width requested along existing corridors will vary depending on the current easement widths in those locations.

Easements allow our team access for construction, operation and maintenance of the transmission line. In general, the land can continue to be used as before, provided that the use does not interfere with the transmission line.

Real Estate

Construction

Transmission line construction is completed in intermittent phases and will not be constant on landowner property. We will provide more information before construction begins on any landowner property. Construction will begin in 2026.

Preconstruction Surveys

Prior to construction, Ameren will conduct surveys to collect information necessary for construction to start. The field data we collect will help our engineers determine the final design and structure locations and will help to minimize impacts to cultural and biological resources during construction. Examples of types of surveys conducted include:

  • Wildlife Surveys
  • Archaeological Surveys
  • Wetland and Stream Surveys
  • Soil Surveys
  • Property Surveys

Construction

On most structures, there will be six major stages of construction including:

routing process

Survey structure locations, soil borings, vegetation management and access roads

routing process

Assemble structure on the ground

routing process

Dig structure holes

routing process

Lift structure into hole backfill with concrete

routing process

String wires

routing process

Energize line and restore easement

Vegetation Management

Safety and reliability are the driving factors behind managing trees, and other forms of vegetation, around our transmission lines. Trees and other vegetation can damage the line and hinder our ability to deliver electric services safely and reliably. They can make the job of storm restoration more difficult, extend restoration times and pose additional hazards to line crews.

To protect the public and reduce the risk of extended power outages, Ameren has a vegetation management program designed to ensure proper clearances around the lines as required by federal and state agencies. The program reduces the potential for damage and allows access for crews to maintain and repair transmission equipment.

This vegetation management work may include:

  • Mowing
  • Manual and Aerial Trimming
  • Removal of Vegetation
  • Inspections
Learn more about Ameren's vegetation management