Indiana manufacturers are absorbing three new developments this week, and they do not all point the same direction. The IURC has opened a formal investigation into NIPSCO's August 11 derecho response. Indiana's statewide industrial property assessed value recorded a 25.8% single-year surge driven largely by a state accounting methodology change. And Honda is reportedly in final discussions on a new Ohio hybrid assembly plant that creates a concrete sourcing window for Indiana Tier-1 and Tier-2 suppliers by 2030. Two of these are cost pressures operators did not cause. One is an opportunity with a narrow qualification window.

NIPSCO Derecho Response Under Formal IURC Review

The Indiana Utility Regulatory Commission confirmed Tuesday it is opening a formal investigation into NIPSCO's preparation and response to the August 11 derecho, which knocked out power to more than 300,000 customers across Northwest Indiana, some for up to two weeks. A procedural schedule will be set at a September 28 virtual attorney's conference. NIPSCO must answer questions across eight specific areas, including vegetation management data, contractor deployment, and staffing levels.

The buried fact in NBC Chicago's reporting: NIPSCO committed to trim vegetation along 1,263 miles of power lines in the year before the storm and completed only 954 miles. That is a 24% shortfall on a specific deliverable funded by the $2.5 billion infrastructure program and the 16.75% rate increase the IURC approved in June 2025. Former IURC Commissioner Dave Ober has confirmed the Commission cannot issue mandatory fines even if it finds negligence. Northwest Indiana manufacturers on Rate 631 are absorbing higher costs right now, concurrent with this investigation. Not as a reward for improvement that already happened. Right now, while the investigation is still open.

If you have not put a number on what a two-week grid outage costs your facility against the cost of on-site backup generation, this investigation is your prompt to do that calculation before the next storm season.

For more on how grid reliability indices and outage data factor into these decisions, see Grid Reliability Indices (SAIDI, SAIFI, CAIDI, MAIFI) Explained for Commercial and Industrial Operators and C&I Backup Power Strategy: Diesel, Natural Gas, or Battery.

Indiana Industrial Property Assessments Surged 25.8%: The Methodology Change Most Coverage Missed

This story is statewide and hits every Indiana manufacturer regardless of utility provider. Indiana's statewide assessed value of industrial property surged 25.8% in 2026 compared to 2025, per DLGF assessment data.

A major structural driver of this increase has nothing to do with what your plant is worth on the open market. The state Department of Local Government Finance updated its cost-of-construction data for the first time in four years and eliminated a long-standing cost-localization adjustment that had suppressed Indiana's industrial appraisal base relative to national construction cost tables. Your facility may not be worth 25.8% more. The state's accounting methodology changed, and you are carrying the result on your tax bill.

The data center buildout compounds the problem in specific counties. Boone County recorded a 956% surge in industrial vacant property values tied to hyperscale players including AWS. That concentration is how dramatically hyperscale demand is reshaping the industrial property category, particularly for facilities in or near data center corridors. Indiana Manufacturers Association President and CEO Andrew Berger has noted that more than 80% of the $1.5 billion in property tax cuts from 2025 legislation flows to homeowners, meaning the commercial and industrial base absorbs the offset as local governments hold spending steady.

The Legislative Council has directed a Fiscal Policy Committee study ahead of the 2027 session. That is a narrow window. Pull your 2026 Notice of Assessment now, verify your specific increase, and get engaged with the IMA on the assessment reform study before that window closes.

Honda's Reported Ohio Hybrid Plant Creates a Supplier Qualification Window for Indiana

Per reporting from Nikkei and Automotive News, Honda is reportedly in the final stage of discussions to build a new hybrid vehicle assembly plant in Ohio, its first U.S. assembly plant in roughly two decades, at a reported cost of between approximately $1.9 billion and $2.53 billion, with production targeted to start in 2030. Reported annual capacity is approximately 250,000 vehicles, building two large crossovers for the Honda and Acura brands. Honda has not officially confirmed the project.

With that sourcing caveat on the table, here is the under-reported constraint that makes this worth watching regardless of confirmation timing. Honda has publicly committed to a 15-model hybrid lineup by March 2030, and its May 2026 business briefing committed to raising local content of hybrid motors and inverters by more than four times current levels to hedge U.S. tariff exposure. Honda has not publicly announced transmission or hybrid power unit capacity expansion to match a 15-model lineup plus a reported new assembly plant. That raises the question of where that powertrain volume comes from, and it creates a plausible sourcing opening for Tier-1 suppliers. Indiana is already an active node in Honda's hybrid ramp. The Honda Indiana plant in Lincoln is producing the 2026 Civic hatchback hybrid right now.

Supplier qualification windows open before groundbreakings, not after. If you are a Tier-1 or Tier-2 stamper or powertrain component maker already in Honda's Ohio bill of materials, the time to engage Honda's North American procurement team is now.

Questions for Your Morning Huddle

Q: NIPSCO completed only 954 of the 1,263 miles of vegetation trimming it committed to before the August 11 storm. What does that mean for my reliability exposure going forward?

A: It means the infrastructure gap that contributed to the two-week outage has not been fully closed, and the IURC investigation cannot issue mandatory fines even if it finds negligence. Your backup generation calculus needs to be based on the grid as it actually is, not on the rate increase NIPSCO collected.

Q: My Indiana facility's assessed value jumped significantly in 2026. Is that because my plant is actually worth more?

A: Probably not entirely. A major driver of the 25.8% statewide industrial assessment surge is a DLGF methodology change, specifically the elimination of a cost-localization adjustment and an update to construction cost tables that had not been revised in four years. Pull your 2026 Notice of Assessment and verify the specific basis for your increase before any appeal window closes.

Q: Honda has not confirmed the Ohio plant. Should I be doing anything now?

A: Yes. Supplier qualification timelines run ahead of groundbreaking announcements, sometimes by two or more years. If your facility produces stamped components or powertrain parts already used in Honda's Ohio supply chain, the right time to engage Honda's North American procurement team is before the project is officially announced, not after.

Q: Indiana manufacturers are absorbing higher NIPSCO rates and a higher property tax assessment at the same time. What is the right sequence of action?

A: Run the outage cost calculation first, because the next storm does not wait for the legislative calendar. Then pull your 2026 Notice of Assessment and verify the methodology behind your specific increase. Engage the IMA on the Fiscal Policy Committee study while that window is open. These are parallel actions, not a sequence you can defer one item to complete the other.

Related reading: If you are tracking how utility rate cases and tracker filings translate into your facility's all-in power costs, see the earlier TEG Daily on NIPSCO TDSIC Cost Recovery Lands at the Indiana Supreme Court and IURC NIPSCO Affordability Investigation Goes Formal.