Illinois battery-storage plan moves state closer to solar reliability goals

Illinois approves storage contracts

The Illinois Commerce Commission approved winning bids on September 1 for 600 megawatts of new utility-scale energy storage, and contracts were awarded after the regulatory review formally concluded.

The procurement followed the Clean and Reliable Grid Affordability Act, which Governor JB Pritzker signed on January 8 before the law formally took effect on June 1, 2026.

Batteries support renewable power

Battery systems can store electricity during periods of available solar and wind generation, then release that energy later as renewable output falls or customer demand rises across the grid.

This flexibility gives grid operators another resource for balancing supply and demand as Illinois adds renewable generation while maintaining dependable electricity service for homes and businesses throughout the state.

First procurement misses target

The Illinois Power Agency sought 1,038 megawatts of stand-alone energy storage during the August procurement, establishing the initial formal capacity target required under the state’s new statutory framework.

Contracts ultimately covered 600 megawatts, leaving a 438-megawatt gap below the target. Five projects received awards after the Illinois Commerce Commission formally approved those successful bids following review.

New projects expand storage capacity

Illinois entered the procurement with a relatively small utility-scale storage base, while the newly contracted projects would eventually add 600 megawatts of capacity if they reach commercial operation.

Selected projects generally must reach commercial operation by December 31, 2029, although procurement rules allow limited extensions through December 31, 2030 when specific requirements are met by developers.

State targets 3,000 megawatts

The Clean and Reliable Grid Affordability Act establishes a target of 3,000 megawatts of cumulative energy storage capacity committed to commercial operation across Illinois by December 31, 2030.

Illinois law requires additional energy storage procurements in both 2027 and 2028, giving the state further opportunities to secure projects toward the 3,000-megawatt cumulative target through later rounds.

MISO exceeds its target

The Midcontinent Independent System Operator Local Resource Zone 4 received a 450-megawatt energy storage target covering central and southern Illinois, where selected projects exceeded the required regional amount.

Four projects in that territory secured 520 megawatts, finishing 70 megawatts above the assigned goal and providing most of the new capacity selected during the opening procurement round in Illinois.

Fun fact: Solar power made up 54% of all new electric generating capacity added to the U.S. grid in 2025 alone.

PJM falls below its target

The PJM ComEd Locational Deliverability Area received a 588-megawatt target for new stand-alone energy storage projects under the initial regional allocation established under Illinois law and procurement rules.

One project totaling 80 megawatts was selected there, leaving the PJM portion well below its regional target while MISO Local Resource Zone 4 exceeded its assigned procurement amount.

Little-known fact: Utility-scale battery storage in the U.S. exceeded 26 gigawatts during 2024, with cumulative capacity rising above that level.

PJM queue conditions changed

PJM previously faced lengthy interconnection queue delays, although by June 2026 its redesigned process had cleared the old backlog and moved new service requests into active project reviews.

James Gignac linked the lower PJM procurement result partly to a mismatch between project development schedules and required commercial operation dates rather than an established inherent regional difference.

Future rules may change

The Illinois Power Agency plans to request written stakeholder feedback during fall 2026, using responses to identify barriers and prepare revised requirements for additional energy storage procurement rounds.

Future rounds can use more flexible terms than the opening process, while procurement requirements and regional allocations may change as agencies refine the program after reviewing initial results.

Paired projects may qualify later

The initial procurement accepted stand-alone energy storage projects only. Later rounds may allow systems paired with renewable generation, depending on requirements established for those future competitive bidding events.

Paired systems can store renewable electricity when it is available and release it later, giving developers another possible project configuration as Illinois further expands generation and storage capacity.

National capacity continues growing

Solar and battery storage together accounted for 70% of all new United States grid capacity added during the first half of 2026, reflecting rapid growth in both technologies.

Separately, operating solar capacity in the United States was estimated to generate enough electricity to serve more than 50 million homes, illustrating the scale of existing national deployment.

Virtual power plants add flexibility

Illinois established scheduled-dispatch virtual power plant programs for eligible distributed-storage systems across Commonwealth Edison Company and Ameren Illinois Company service territories under the new state energy law framework.

The programs coordinate eligible storage during designated dispatch periods, allowing participating systems to offset customer use or send electricity to distribution networks while collectively supporting reliable grid operations.

Want to stay ahead of the news? Check out why America’s $4 billion wind rollback is reshaping energy investment as cheap natural gas gains ground again.

Planning process sets next steps

The first Integrated Resource Plan has a legal filing deadline of November 15, with submission expected no later than November 16 because the statutory date falls on Sunday.

The Illinois Power Agency must also publish an Energy Storage Resources Procurement Plan for public comment by June 1, 2027, which may propose additional competitive procurements for storage resources.

Want to read more about the latest developments? Check out how a North Dakota solar project could add battery storage and a data center near Fargo.

What stands out more, Illinois’ new battery storage contracts or the state’s broader push to make solar power more reliable? Share your thoughts.

This slideshow was made with AI assistance and human editing.

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