Ameren Illinois Integrated Grid Plan (2028-2031)

By Global Infrastructure Sherpa · Jan 20, 2026

Development Transmission announced USA Jan 20, 2026

development

Stage

Integrated Grid Plan

Project

Ameren Illinois filed its second multi-year integrated grid plan (2028-2031) with the Illinois Commerce Commission (ICC). The plan seeks approval of programs and projects to guide the infrastructure improvements and customer program upgrades needed to manage the shift to cleaner energy sources while ensuring that always-on, reliable power is available to meet growing demand.

Deal Analysis

Ameren Illinois' announced Integrated Grid Plan (2028-2031), filed with the Illinois Commerce Commission (ICC), represents a significant undertaking to modernize the utility's infrastructure. The plan aims to facilitate the transition to cleaner energy sources while maintaining reliable power delivery to its 1.2 million electric and 800,000 natural gas customers in central and southern Illinois. This multi-year initiative underscores the growing need for grid modernization to accommodate increasing demand and the integration of renewable energy resources. The ICC's review and potential approval are crucial for Ameren Illinois to execute its long-term infrastructure development strategy. While the specific value of the plan remains undisclosed, its scope suggests a substantial investment in transmission infrastructure and customer programs. The involvement of Ameren Illinois, a major regulated utility, and the ICC, the state's regulatory body, highlights the importance of this plan for the energy landscape in Illinois. The plan's focus on grid modernization aligns with broader industry trends toward enhancing grid resilience, enabling renewable energy integration, and improving overall system efficiency. The outcome of the ICC's review will likely set a precedent for future grid modernization initiatives in the state.

Multi-year integrated grid plan (2028-2031) focused on infrastructure improvements and customer program upgrades.
Filed by Ameren Illinois, a major regulated utility serving 1.2 million electric and 800,000 natural gas customers.
Subject to approval by the Illinois Commerce Commission (ICC).
Aims to manage the shift to cleaner energy sources while ensuring reliable power.

Market Context: The deal falls within the transmission sector, which is currently experiencing significant growth driven by the need to modernize aging infrastructure, integrate renewable energy sources, and enhance grid resilience. Utilities are increasingly investing in grid modernization projects to meet evolving energy demands and regulatory requirements.

Source Intelligence

KEY DETAILS

The plan is in alignment with Illinois state laws—the Climate and Equitable Jobs Act (2021) and the recently passed Clean and Reliable Grid Affordability Act (2026)." The plan outlines planned investments centering on maintaining safe and reliable service through modernization of the electric grid, replacement of aging infrastructure, preventative maintenance, and automation, while also directing more than half of the investments to benefit customers living in equity-eligible communities." An ICC final order is expected in December 2026." It’s estimated that the projects outlined in the plan would increase the typical monthly residential customer bill by about $5.00 annually starting in 2028, with similar adjustments in subsequent plan years.

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Location

Reliability in Illinois Integrated Grid Plan

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Announcement

On January 20, 2026, Ameren Illinois filed its second multi-year integrated grid plan (2028-2031) with the Illinois Commerce Commission (ICC)

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COD

The plan, if approved by the ICC, will go into effect January 2028.

PARTIES MENTIONED IN SOURCE

Ameren Illinois developer

"On January 20, 2026, Ameren Illinois filed its second multi-year integrated grid plan (2028-2031) with the Illinois Commerce Commission (ICC)"