Illinois, historically at the forefront of nuclear power, is now poised to revitalize its nuclear energy landscape after a lengthy pause. Recent developments in state policy have reignited discussions on nuclear’s role in meeting the growing demands for clean and reliable energy. With Governor J.B. Pritzker’s recent signing of the Clean and Reliable Grid Affordability Act (CRGA Act), Illinois has lifted a long-standing moratorium on new nuclear projects, setting the stage for significant advancements in the state’s energy strategy.
State Sen. Sue Rezin, a longtime advocate for nuclear energy, expressed optimism about this shift. She emphasized that nuclear energy is “the only proven, carbon-free baseload resource capable of operating around the clock at the scale Illinois will need.” With this legislative victory, Illinois is embracing an “all-of-the-above” approach to energy, aiming to bolster grid stability and support economic growth.
The Evolution of Nuclear Policy
Over the past decade, Illinois has grappled with uncertainty surrounding its nuclear future. Back in 2016, Constellation, then known as Exelon Generation, announced potential closures of the Clinton and Quad Cities nuclear plants, prompting legislative action. The Illinois General Assembly responded with the Future Energy Jobs Act (FEJA), which supported these plants through a zero-emission credit program, channeling $235 million annually into the nuclear sector.
Despite this support, four other plants—Braidwood, Byron, Dresden, and LaSalle—remained vulnerable. By 2020, market pressures from cheap natural gas and other factors threatened their viability. However, the Climate and Equitable Jobs Act (CEJA) in 2021 provided a lifeline, further cementing Illinois’s commitment to nuclear energy while setting ambitious renewable energy goals.
Shifting Focus: Meeting Growing Energy Demands
The CRGA Act marks a pivotal shift in Illinois’s energy policy, acknowledging the limitations of a renewables-only strategy. Rising energy demands, driven by factors such as electrification and data center proliferation, have highlighted the need for dependable power sources. Cathriona Fey of the Illinois Economic Development Council noted that CEJA positioned Illinois ahead in clean energy efforts but acknowledged the essential role of nuclear in meeting future needs.
A report from the Federal Reserve underscores the surge in electricity demand from 2021 to 2023, primarily fueled by commercial needs. Data centers are a significant factor, with Illinois ranking fourth in the nation for the number of such facilities. Argonne National Laboratory’s report suggests that nuclear power could play a key role in supporting this growth, projecting that peak demand could rise by 15-18% over the next decade, largely due to data centers and crypto mining.
Navigating Legislative Changes
Governor Pritzker’s signing of H.B. 2473, allowing small modular reactors, was a significant milestone. Although initial attempts faced challenges, the CRGA Act establishes a comprehensive framework for nuclear expansion. State Sen. Rezin highlighted the importance of an all-encompassing energy strategy, emphasizing the need for consistent baseload power.
Data Centers and Energy Demand
The growing number of data centers has placed unprecedented demand on Illinois’s power grid. A Synapse report commissioned by the Illinois Manufacturers’ Association projects a substantial increase in electricity consumption by data centers, raising concerns about the state’s ability to meet future energy needs without expanding its nuclear capabilities.
Constellation’s Role in the Nuclear Renaissance
Constellation’s commitment to Illinois is reflected in its strategic investments, such as the partnership with Meta for the Clinton plant. This collaboration ensures long-term stability and paves the way for additional nuclear capacity. Dwayne Pickett of Constellation expressed confidence in Illinois as the ideal location for nuclear development, citing the state’s supportive communities and policy changes.
Exploring Advanced Nuclear Opportunities
Illinois is also attracting attention from innovative nuclear companies like Nano Nuclear, which is collaborating with the University of Illinois on advanced reactor projects. Florent Heidet of Nano Nuclear emphasized the state’s strategic importance for future nuclear initiatives, driven by both growing energy demands and a robust local workforce.
Looking Ahead: Illinois’s Nuclear Prospects
With the CRGA Act and ongoing support from industry leaders, Illinois is well-positioned to capitalize on its nuclear potential. The state’s existing infrastructure, skilled workforce, and favorable policy environment make it an attractive destination for nuclear development. As the state continues to navigate its energy transition, nuclear power is set to play a crucial role in ensuring a stable and sustainable energy future.
Footnotes
- Nida Çakır Melek and Alex Gallin, “Powering Up: The Surging Demand for Electricity,” kcFed Economic Bulletin, September 2024 (Public Affairs Department of the Federal Reserve Bank of Kansas City); Powering Up: The Surging Demand for Electricity – Federal Reserve Bank of Kansas City.
- Marcus Lu, “Mapped: U.S. states with the most data centers in 2025,” Visual Capitalist (December 12, 2025); visualcapitalist.com/mapped-u-s-states-with-the-most-data-centers-in-2025/.
- Nicolas E. Stauff et al., Preliminary Analysis of Nuclear-Powered Data Center Scenarios, Argonne National Laboratory, ANL/NSE-25/47 (August 31, 2025); https://doi.org/10.2172/3001074.
- A. Shehabi et al., 2024 United States Data Center Energy Usage Report, Lawrence Berkeley National Laboratory, LBNL-2001637 (December 2024); https://doi.org/10.71468/P1WC7Q.
- Chelsea Mattioda et al., “A snapshot of the energy landscape in Illinois: Considerations for the state’s energy transition,” Synapse Energy Economics Inc., prepared for the Illinois Manufacturers’ Association (April 30, 2025); synapse-energy.com/sites/default/files/A%20Snapshot%20of%20the%20Energy%20Landscape%20in%20Illinois_Synapse%20report%20for%20IMA%2024-134.pdf.
- 2025 Resource Adequacy Study, submitted to the Illinois General Assembly (December 15, 2025); ipa.illinois.gov/content/dam/soi/en/web/ipa/documents/20251215-illinois-ra-study-2025-final.pdf.
Original Story at www.ans.org