Holtec Postponed Its IPO. Then a Problem at Its Nuclear Plant Became Public.

Holtec postponed its proposed IPO. Four days later, it disclosed that a fuel assembly had tilted during loading at the Palisades reactor, pausing the work while it develops a retrieval plan that Holtec says will be submitted to the NRC for approval through a license-amendment request.

Holtec Nuclear Corp. filed to sell 50 million Class A shares at an expected price of $15 to $18 apiece, a proposed offering that could have raised $750 million to $900 million in gross proceeds before any overallotment option. It had applied to list its shares on Nasdaq and Nasdaq Texas under the ticker HNUC.

Then, on September 17, Holtec said it had decided to postpone the offering after discussions with its banking syndicate. The company said weakened investor confidence in new public offerings, including in the nuclear sector, had contributed to the decision, and said it intended to keep its registration statement on file with the SEC.

Four days later, on September 21, Holtec disclosed a problem during fuel loading at the Palisades nuclear plant. The company said one fuel assembly “tilted from its upright position after it had been placed,” after the fuel-handling-machine grapple had disengaged. Fuel loading, which began August 30, remains paused while Holtec addresses the affected assembly.

Holtec said plant personnel notified the NRC and that its evaluation found the event did not trigger NRC safety-reporting requirements. The company said it had begun a root-cause evaluation, was developing equipment to retrieve the assembly and return it to the spent-fuel pool, and was preparing a license-amendment request related to the retrieval methodology.

The fuel-handling event came amid other operational and regulatory issues at Palisades. An NRC inspection identified radiation-protection and internal-dose-monitoring violations. The site also reported a worker fall into the reactor cavity, a hydrazine discharge-permit exceedance and delays in the restart schedule. Residents had raised safety and environmental concerns in federal court the previous November; the work cited in the NRC findings and the fuel-handling event occurred after they sued.

What the inspectors found

On August 31, the NRC issued an inspection report covering radiation-protection work at Palisades from February 23 through March 20, 2026. The report documented two findings classified as Green—NRC’s lowest safety-significance category—and associated non-cited violations. The report describes multiple failures to carry out prescribed radiation-protection controls and internal-dose assessments during the work and records inspectors reviewed.

The NRC’s inspection report also said that, in its review of relevant records, inspectors did not identify instances in which occupational dose limits were challenged. The agency considered whether the elevated airborne-radioactivity readings warranted a reactive inspection and determined that one was not necessary.

In February, workers entered the tilt pit, part of the fuel transfer system, to upgrade fuel-handling equipment. The radiation controls for that job were based on a September 2025 survey that never measured the pit floor.

When a technician finally surveyed it on February 13, alpha contamination measured 6.5 million disintegrations per minute per 100 square centimeters. The job’s stop-work level was 500,000.

Airborne radioactivity inside the pit reached 173 times the derived air concentration on February 11 and 469 times on February 13. Workers in the tilt pit wore respirators and lapel air samplers under the radiation work permit.

Workers in the adjacent floor-above area wore lapel air samplers but were not required to wear respirators because the area had not been posted or controlled as an airborne-radioactivity area. Air there measured 2.21 and 3.82 times the derived air concentration, against a stop-work threshold of 0.3. The area sat near the containment equipment hatch, which the NRC described as “the routine entry/exit point for containment.”

“Workers were not evacuated from the area or informed of the ARA conditions, the area was not posted or controlled as an ARA, and these occurrences were not documented in the corrective action program,” inspectors wrote. Follow-up air samples were taken about eight hours and 16 hours after the high readings.

Inspectors identified comparable control and documentation failures during work on a shutdown-cooling heat exchanger. A January 6 air sample, analyzed after workers left, showed 890 times the derived air concentration against a stop-work level of 40. The record had no remarks. No condition report was written.

The second violation involved dose tracking. The plant gave inspectors a worksheet of 29 lapel air-sampler results since January 1, all above the site’s 10-millirem investigation threshold. None of the dose evaluations required by plant procedures had been done. One sample from housekeeping work showed 690 millirem. The plant had marked some results as cross-contaminated using a process the NRC said “is not described in site procedures.”

The NRC said the plant’s radiological conditions “changed significantly enough that the established protocols did not adequately address managing the alpha contamination levels.” The NRC report says Holtec initiated a root cause evaluation, established a review process for high-risk radiological work and began evaluating lapel results back to November 2025.

Earlier events at the site

Weeks before the residents sued, two other events were reported at the site.

An NRC event notification filed October 21, 2025, No. 57996, reported that at 9:30 a.m. that day “an individual fell into the reactor cavity. The reactor cavity is full of water. They ingested some amount of cavity water.” The worker was decontaminated “but had 300 counts per minute detected in their hair” and was sent off site for medical attention that afternoon. Holtec spokesperson Nick Culp said the worker was “promptly assisted from the water, evaluated, monitored, and decontaminated.”

Early the next morning, October 22, the plant reported to the NRC that it had exceeded the hydrazine limit in its state water discharge permit, requiring notification to Michigan’s Department of Environment, Great Lakes, and Energy. The NRC event report, No. 57998, says the exceedance did not violate NRC rules.

The restart schedule has changed since Holtec began pursuing the project. In its September 8 filing, the company said its Palisades backlog had declined from December 2025, “primarily attributable to an adjustment in the timing of the Palisades restart.”

What the neighbors said

On November 14, 2025, Beyond Nuclear, Don’t Waste Michigan and Michigan Safe Energy Future sued the NRC and Holtec Decommissioning International in federal court in Michigan. They challenged the NRC’s July 24, 2025 exemption and related licensing actions that allowed Holtec to rescind the certifications that had barred reactor operation and fuel loading.

The objections were not new. The same groups had petitioned the NRC for a hearing on the restart in October 2024, and an NRC licensing board rejected that request in March 2025.

The complaint names five residents. W. Dillon Reed and Caroline Ferry live in Covert, about three-quarters of a mile from Palisades. Joseph C. Kirk lives in Palisades Park, 0.8 miles away. James and Ann Scott live in Covert, 1.2 miles away. Each, according to the complaint, walks the beach “and wades in the Lake within a few hundred yards of Palisades.”

The complaint says each resident cited “concerns over safety; the potential for significant damage to public health and the environment from the restart; Holtec’s lack of nuclear power generation experience; and the controversial historical performance of the parent company, Holtec International.” Each also believed, according to the complaint, that the plant’s age and condition would lead to accidents and radiation releases, along with routine releases from an operating plant. The groups argued that “risks to the public health and safety prompted Palisades to be shut down earlier than anticipated.” Entergy took the reactor offline 11 days before its planned May 31, 2022 closure date, citing the performance of a control rod drive seal.

The district court did not reach the merits of the plaintiffs’ safety and environmental claims. On June 26, 2026, Chief U.S. District Judge Hala Y. Jarbou dismissed the case without prejudice, concluding that the exemption was so closely tied to the NRC licensing proceeding that review belonged in a federal court of appeals with jurisdiction over NRC licensing orders. The exemption, she wrote, “had no real-world significance on its own” and was “practically bound up with the proceedings for amending Holtec’s operating license.” Eleven days earlier, the NRC had upheld the denial of the groups’ request for a hearing.

How Palisades got here

Palisades, a Combustion Engineering pressurized water reactor on the Lake Michigan shore, began commercial operation in 1971 under Consumers Power. Entergy bought it in 2007. Entergy shut Palisades on May 20, 2022. The closure coincided with the expiration of the plant’s 15-year power-purchase agreement with Consumers Energy and followed what Entergy described as its strategy to exit the merchant power generation business.

Entergy certified to the NRC that operations had permanently ceased and fuel had been removed. Those certifications barred the plant from operating again. In June 2022 Holtec, whose business had been dismantling retired reactors, bought Palisades to decommission it.

Gov. Gretchen Whitmer had already asked the federal government for money to keep the plant open. Holtec changed course. It signed power contracts with Wolverine Power Cooperative and Hoosier Energy, secured a Department of Energy loan-guarantee facility of up to $1.52 billion and a $300 million grant from the State of Michigan. Holtec has argued that restarting Palisades would restore a large source of carbon-free, around-the-clock generation at a time of rising electricity demand.

Palisades in the postponed IPO

The registration statement for Holtec’s postponed IPO tells investors that Palisades will make up most of its generating capacity for years. It lists risks that include “inadequacy or lapses in maintenance protocols, human error” and “the potential for a serious incident at the Palisades plant.”

Holtec’s September 8 preliminary prospectus described the August 30 start of fuel loading as a restart milestone. The filing predates the company’s September 21 public disclosure of the tilted fuel assembly. It does not, by itself, establish whether the incident had occurred—or was known to company officials—when the filing was made.

If Holtec completes the offering and becomes a public reporting company, it would be subject to periodic SEC reporting requirements, including annual and quarterly reports and, where applicable, current reports on material events.

Holtec’s September 8 filing said it expected the remaining restart work to be completed in 2026, ahead of a March 2027 commitment date with its counterparties. The company has said the restart is supported by long-term power-purchase agreements with regional electric cooperatives.

Before Palisades can proceed toward startup, Holtec must resolve the affected fuel assembly, complete fuel loading and reactor-vessel reassembly, finish required testing and modifications, and obtain applicable NRC approvals. Holtec says the next planned operating condition after fuel loading and vessel reassembly is Mode 5, or cold shutdown, before further startup progression. The company says it remains focused on returning Palisades to “safe and reliable operation once all restart work is complete.”

Sources: Holtec International, “Progress Report on Palisades’ March to Startup,” Sept. 21, 2026; U.S. NRC Inspection Report 05000255/2026090 (ML26245A104), Aug. 31, 2026; NRC Event Notification Reports No. 57996 (Oct. 21, 2025) and No. 57998 (Oct. 22, 2025); Holtec Nuclear Corp. Form S-1/A, Sept. 8, 2026; Entergy, “Entergy’s Palisades team finishes strong as facility shuts down,” May 2022; Holtec releases, “Holtec Nuclear Corporation Announces Launch of Initial Public Offering,” Sept. 8, 2026, and “Holtec Nuclear Corporation Initial Public Offering Postponed,” Sept. 17, 2026; Complaint, Beyond Nuclear et al. v. NRC, No. 1:25-cv-01463 (W.D. Mich., filed Nov. 14, 2025); Opinion and Order Granting Motions to Dismiss, same case (June 26, 2026).