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Highlights from Crux’s webinar on interim FEOC guidance

February 25, 2026

On February 12, the US Department of the Treasury and the Internal Revenue Service (IRS) released interim guidance (Notice 2026-15) on the prohibited foreign entity (PFE) rules under the One Big Beautiful Bill (OBBB). This guidance replaced and significantly expanded the prior Foreign Entity of Concern (FEOC) framework enacted in the OBBB.

With PFE requirements in effect since January 1, 2026, the clean energy industry has been eager for clarity — and this notice delivers a meaningful, if incomplete, set of answers. Crux recently hosted a webinar to unpack the implications of the new guidance with policy, legal, and accounting experts. Panelists included:

  • Elizabeth Crouse, Tax and Renewables Attorney at Holland and Knight
  • Josh Morris, Partner at Novogradac
  • Hasan Nazar, Head of Government Affairs & Public Policy at Crux
  • Katie Bays, Director of Research at Crux

Here are their top takeaways:

  1. While the guidance doesn't answer all of the industry's questions, it provides a meaningful amount of certainty on specific issues, giving market participants more confidence.
  2. The guidance is incomplete, but it seems to reveal a desire on Treasury's part to make the rules workable.
  3. Developers should reach out to third-party advisors now and ensure they have good process management in place to comply with the interim guidance.

For a full analysis of the interim guidance, refer to Crux’s blog post

1. The guidance provides real clarity on material assistance

The release focuses narrowly on the material assistance cost ratio (MACR) requirement — the formula for calculating whether a project or component's costs are sufficiently free of PFE involvement to qualify for §45Y, §48E, or §45X tax credits.  "The fact that the MACR calculation has now been fully operationalized — I think that's a big win," said Morris. "The guidance should help thaw what has noticeably been a frozen tax equity market. Projects with clear supply chain mapping and strong manufacturer certifications will now have a defined path to proceed."

Crouse agreed. "It really does address quite a few things pretty clearly... We've got a really workable game plan from cradle to grave, all the way from component supply to financing," she noted.

Importantly, while the guidance leaves key questions unanswered — particularly around who qualifies as a PFE — Nazar emphasized that the MACR clarity, combined with the market's proactive compliance posture, should give both buyers and sellers of tax credits more confidence to move forward with transactions. 

2. The guidance signals that Treasury wants these rules to be workable

Beyond the specific mechanics, the panelists noted that the overall direction of the guidance reveals something about Treasury's posture. “I think the important signal from the notice is that the dominant framework across the market is tier-one supplier accountability,” Nazar noted. “I think that is a good signal on the trajectory of where things will go.” The panel also highlighted that the decision to repurpose existing domestic content tables — rather than creating an entirely new compliance apparatus — suggests an intent to build on frameworks the industry already knows. "They're not trying to slow projects down," Morris said. "They're trying to create a real framework that folks can operate in."

That's particularly good news for eligible solar, wind, and battery storage projects with established domestic supply chains, which can pivot existing compliance infrastructure with relative ease. The panelists singled out the §45X averaging rule for batteries, which allows manufacturers who produce multiple varieties of eligible components to average their MACR calculations across product lines, as a particular bright spot, giving manufacturers more flexibility in their calculation. 

Technologies without safe harbor tables — such as nuclear, fuel cells, and geothermal — face a harder path until Treasury issues their tables later this year, but Nazar noted that the consistent approach applied to solar, wind, and batteries is "hopefully a very good sign" that those technologies will receive a similarly workable treatment.

3. Developers and manufacturers should prepare now and engage advisors early

The panelists noted that unlike bonus adder requirements, PFE compliance is binary: taxpayers must meet the threshold or lose their tax credit entirely. However, the industry has navigated similarly high-stakes moments, and market participants are already preparing and working to update their processes.

The panelists recommended that taxpayers engage their legal and tax advisors now, start mapping their supply chains, and build their compliance package. "You want to reach out to your third-party advisors early — now — and get in their queue. Don't wait," Morris urged. "We're going to be thorough no matter what the time pressures are... If you're waiting, you might not get fast responsiveness."

Watch the full webinar

The panelists covered much more ground, including audience questions on critical minerals, contract negotiations, and the interplay between PFE and domestic content compliance.  For more insights, watch the full webinar replay below. 

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