Iowa Regulators Modify Summit Carbon Pipeline Permit, Keep Construction Ban in Place

The Iowa Utilities Commission has amended the permit terms governing Summit Carbon Solutions' proposed CO2 pipeline, stripping out language that had tied construction approval specifically to the Dakotas while leaving the underlying ban on breaking ground fully intact.

The change follows a remand from Polk County District Court after South Dakota lawmakers passed a bill in 2025 banning eminent domain for carbon pipelines, a move that made Summit's original route through the state legally unworkable.

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Summit's August 2024 permit required the company to secure regulatory approval in both North Dakota and South Dakota before construction could begin. With South Dakota's ban in place and the North Dakota sequestration site tied up in litigation, that condition no longer matched the project Summit is actually building. The commission replaced it with a functional standard instead: Summit must show proof of a continuous, authorized route from Iowa's ethanol plants to a legally compliant sequestration site, no matter which states that route crosses.

A Smaller Footprint

The permit modification lands as Summit scales back its Iowa presence. The company has dropped eight counties, Shelby, Pottawattamie, Montgomery, Adams, Page, Fremont, Mitchell, and Worth, from its route and trimmed mileage in four more. That removes more than 400 landowners and cuts roughly 200 miles from the project. Summit says the pipeline will now run west through Nebraska toward a sequestration site in Wyoming, still connecting 27 Iowa ethanol plants along the way.

Opposition Still Active

Not everyone sees the changes as progress. Jess Mazour, conservation coordinator for the Sierra Club Iowa Chapter, has argued the revised project remains, in her words, a plan without a clear destination, and called the restructuring a sign of strain rather than momentum.

The Iowa Farm Bureau has asked the commission to pause Summit's eminent domain authority until full evidentiary hearings can weigh in on the smaller project's viability. Meanwhile, groups like the Iowa Corn Growers Association continue to back the pipeline, pointing to potential gains for corn prices and access to emerging markets like sustainable aviation fuel.

The original 2024 permit order also remains under judicial review in Polk County District Court, a case now sitting alongside the commission's evaluation of Summit's amended terms.

What Comes Next

Even with the permit language updated, Summit still cannot start construction. The commission's order keeps the absolute ban in place until Summit proves it has a workable, legally sound route all the way to storage. With hearings ahead that Summit itself has said will require an extensive defense of witnesses and exhibits, the timeline for breaking ground remains open ended.

For a project once framed around a fixed North Dakota destination, this latest ruling confirms Iowa regulators are now judging Summit less on where the carbon ends up and more on whether the company can prove, step by step, that it can legally get it there.

About Summit Carbon Solutions

Summit Carbon Solutions is a carbon capture and pipeline company based in Ames, Iowa, co-founded by Bruce Rastetter. The company is building a proposed CO2 pipeline network connecting ethanol plants across the Midwest to a sequestration site, aiming to lower the carbon intensity score of ethanol so producers can access emerging markets like sustainable aviation fuel. The project was originally routed through Iowa, North Dakota, South Dakota, and Minnesota, with a fixed sequestration site in North Dakota. As of May 2026, Summit has shifted its plans, now routing west through Nebraska toward a sequestration site in Wyoming.

About the Iowa Utilities Commission

The Iowa Utilities Commission is the state regulatory body that oversees the routing, siting, and permitting of hazardous liquid pipelines in Iowa under Iowa Code chapter 479B. It was formerly named the Iowa Utilities Board before being renamed on July 1, 2024. The commission granted Summit's original pipeline permit in August 2024 and retains authority over any amendments to that permit.

About the Sierra Club Iowa Chapter

The Sierra Club Iowa Chapter is the state branch of the national environmental advocacy organization. The chapter has been one of the lead opponents of Summit's pipeline since 2021, filing legal challenges against the IUC's permit approval and opposing the company's eminent domain authority.

About the Iowa Farm Bureau

The Iowa Farm Bureau is a farmer-led advocacy organization representing agricultural interests across the state. It has taken an active role in the Summit pipeline proceedings, asking the IUC to pause the company's eminent domain authority pending further evidentiary hearings.

About the Iowa Corn Growers Association

The Iowa Corn Growers Association represents Iowa corn producers and advocates for policies that expand market access for corn and ethanol. The group has voiced support for Summit's pipeline, citing potential gains in corn prices and access to new markets like sustainable aviation fuel.