A constitutional lawsuit has frozen AES Indiana's rate case at the worst possible moment — the September 8 IURC reconsideration deadline may pass with the $71 million rate increase locked in by default, leaving central Indiana manufacturers with no regulatory relief before January 2027 costs step up. That is the headline today. Two other developments are reshaping Indiana's industrial supply chain alongside it: Nucor is breaking ground on a $59 million steel grating facility in DeKalb County, and Stellantis has confirmed that the Belvidere restart will not begin pilot production until the first half of 2028 — a second consecutive schedule slip with federal funding now in question.

AES Indiana Rate Freeze: What the September 8 IURC Deadline Means for Your 2027 Power Costs

We have been tracking the AES Indiana rate case since July. On August 12, AES Indiana filed a motion asking the IURC to pause all decisions in the pending docket while former Commissioner Andy Zay's lawsuit against Governor Braun works through the courts.

Here is the mechanism that is being underreported. AES is using Braun's own alleged conduct as a legal shield. By pointing to Zay's allegations — including a June 15 call from the state's energy secretary and a June 18 meeting where Braun reportedly asked how the commission was going to "fix this" — AES has positioned any subsequent commission order that reduces its rates as legally vulnerable to appeal. Kerwin Olson, executive director of the Citizens Action Coalition, stated that AES's motion "implies strongly that they intend to litigate" if the commission acts to reduce the rate.

The practical consequence for manufacturers in AES territory: if the IURC misses the September 8 reconsideration window, the $71 million rate increase locks in by default, including an $8.50-per-month residential hike set for January 2027. The commercial and industrial step-up is proportional and now represents the operative baseline for 2027 power cost planning.

Update your models before September 8. Find out whether you have standing to formally intervene in this docket as an industrial ratepayer. The window closes whether you are ready or not.

Nucor's $59M Steel Grating Plant in DeKalb County: What It Means for Midwest Structural Steel Sourcing

Nucor announced a $59 million expansion of its Vulcraft Indiana facility in St. Joe, DeKalb County — adding a 127,000-square-foot building on its existing 250-acre campus to produce steel grating: industrial flooring, walkways, platforms, and stair treads. Groundbreaking is targeted for Q4 2026, with up to 20 new jobs paying more than 150 percent of the DeKalb County average wage, added to the more than 300 people already on site.

The strategic detail most coverage has not named directly: Steel Dynamics' New Millennium Building Systems subsidiary is headquartered in Fort Wayne, fewer than 30 miles away, and grating has not been part of their publicly marketed portfolio — their core lines are joist and deck. Project specifiers who currently split grating and joist-and-deck orders across multiple vendors can now consolidate both at a single Vulcraft source. New Millennium's published product lines do not currently match that combination in the Midwest.

If you procure structural steel for facility construction or maintenance, the consolidation math may have moved in your favor. Get someone on this before the plant reaches full production in 2027.

Stellantis Belvidere Pushed to 2028: What Indiana Auto Suppliers Need to Reassess Now

Stellantis confirmed on August 14 that the next-generation Jeep Cherokee will be built at its Belvidere, Illinois plant — idle since February 2023 — on the new STLA One global vehicle platform. Pilot production is now targeted for the first half of 2028. Series production is targeted for the second half of 2029. The investment has been increased to more than $800 million, up from the $600 million announced in October 2025.

That headline number carries a financial exposure the announcement does not address. Stellantis was awarded a $335 million DOE grant to electrify Belvidere, and that grant now carries "terminate" status under the Trump administration's cancellation of clean energy awards. Terminate status is not the same as formal revocation — grant terms typically govern reimbursement of qualifying costs already incurred — but if the grant is fully revoked and no qualifying costs are reimbursed, Stellantis' effective exposure could approach $1.1 billion. That is a material increase to the project's all-in cost that could pressure the timeline further.

There is a second risk variable Indiana auto suppliers need to model. The UAW national contract expires April 30, 2028 — potentially just weeks before pilot production is confirmed to begin. That timing creates optionality for both sides at the bargaining table. Model both a clean launch scenario and a work-action scenario. The published timeline is not the only planning case.

If any of your tooling investments or production contracts were timed to the original 2027 restart, reassess those commitments against the new 2028 timeline now — not when the third schedule slip becomes the fourth.

Questions for Your Morning Huddle

Q: What happens to our power costs if the IURC misses the September 8 deadline on the AES Indiana rate case?

A: If the IURC does not act before September 8, the $71 million rate increase locks in by default. For manufacturers in AES territory, that means the January 2027 cost step-up becomes the firm baseline — there is no regulatory relief mechanism available after the window closes.

Q: Does our facility have standing to intervene in the AES Indiana IURC docket before September 8?

A: Large commercial and industrial ratepayers in AES Indiana's service territory may have standing to formally intervene in the rate case docket. Contact an energy attorney or your industry association before the September 8 deadline — waiting until after the window closes removes that option entirely.

Q: Should we reassess our structural steel sourcing agreements given the Nucor Vulcraft DeKalb County expansion?

A: If you currently split grating and joist-and-deck orders across multiple vendors, the Vulcraft expansion in St. Joe creates a potential single-source option in the Midwest that did not previously exist at this scale. Evaluate your sourcing agreements before the plant reaches full production in 2027.

Q: What is the most important thing Indiana auto suppliers should do right now given the Stellantis Belvidere timeline slip?

A: Any tooling investment or production contract timed to the original 2027 Belvidere restart needs a formal reassessment now. Model both a clean 2028 launch and a work-action scenario — the UAW contract expiration on April 30, 2028 lands just weeks before pilot production is scheduled to begin, and that overlap is a material planning risk.

Three deadlines are converging on Indiana manufacturers at once: a September 8 regulatory window that will set your AES power cost baseline for 2027, a steel sourcing consolidation that will be complete before most procurement teams have updated their vendor agreements, and an auto platform restart whose published timeline has already moved twice. None of these wait for a quarterly planning cycle.

For more on how AES Indiana rate proceedings affect your cost structure, see the full coverage in Nucor $59M Steel Plant, IURC Crisis, and Samsung SDI: Indiana Manufacturing News for August 18, 2026 and AES Indiana Rate Deadline September 5: What Indiana Manufacturers Need to Model Before the IURC Vote. For a deeper look at how fuel and tracker charges layer onto rate case outcomes, see Fuel Adjustment Charges: What Indiana C&I Operators Need to Know About This Line Item on Your Electric Bill.