Safe Harbor in the FEOC/PFE Era: The Real Risk Is the Record

Financiers operating in the United States, focus partly on ensuring that renewable energy project Safe Harbor requirements are robustly addressed by the sponsor. Now, Safe Harbor assurance is no longer driven by the same metrics. Did construction begin before the relevant deadline? Was the work significant? Can the project support that position with the right documentation?

Those questions still matter, but now there are additional considerations of utmost importance.

The 4 July 2026 beginning-of-construction (“BOC”) deadline is now driving decisions across the market, so Safe Harbor has become an even more urgent project-risk. Sponsors are moving quickly to preserve tax credit eligibility. Lenders and investors are asking detailed questions that require precise answers. Tax counsel needs a stronger factual record. The new foreign-entity-of-concern/prohibited-foreign-entity (FEOC/PFE) rules are adding another layer of diligence around supply chains, supplier certifications, and component traceability.

The result is simple: it is no longer enough to say that project work has started. The project needs to show it clearly, consistently, and with documents that can stand up to review.

The July 4 deadline has changed the pressure on project teams

IRS Notice 2025-42 places renewed focus on the Physical Work Test for applicable wind and solar facilities. Except for low-output solar facilities (up to 1.5 MW AC), the Physical Work Test is the method available to establish that construction began before July 5, 2026. The test focuses on physical work of a significant nature, and the guidance confirms that off-site work may count when performed under a binding written contract for a given project. Examples include the manufacture of components such as racks, rails, inverters, transformers, and other power conditioning equipment. The sponsor may also pursue domestic content bonus credits, requiring further documentation.

For low-output solar facilities, defined as facilities with maximum net output of not greater than 1.5 MW AC, Notice 2025-42 allows the taxpayer to establish construction either through the Physical Work Test or through principles like 5% Safe Harbor.

This distinction matters because many larger solar and wind projects are now focused on physical work, not just cost incurrence, and the sponsor must document a continuous program of construction. In practice, that puts more pressure on the quality of technical evidence. The project needs to show what was made, where it was made, who made it, when work began, under what contract, how the component connects to the project, and continuous work.

Physical work is not the same as inventory

One of the most important issues is project specificity.

Notice 2025-42 states that physical work of a significant nature does not include work to produce a component that is in existing inventory or normally held in inventory by the seller.

That is where many documentation problems can arise. A supplier may confirm that manufacturing activity occurred, but the record may not clearly show whether the component was tied to a specific project. A purchase order may reference one project entity, while shop records use a different name. A serial number may appear in a QA/QC report, but not in the project allocation schedule. A component may be physically complete, but the evidence may not clearly distinguish it from ordinary inventory.

These are not just administrative details. They are the facts that lenders, investors, and tax counsel need to review, confirm, and document to pass scrutiny of authorities under a facts-and-circumstances test.

The continuous-work requirement is presumed satisfied if the project properly begins construction by 4 July 2026 and is completed within the continuity period (generally 4 years to avoid additional scrutiny).

FEOC/PFE adds another layer

The FEOC/PFE rules have made documentation within the Safe Harbor record even more important. IRS Notice 2026-15 introduced interim guidance on material assistance from prohibited foreign entities “PFEs”), including the Material Assistance Cost Ratio, or MACR. The guidance also provides interim approaches, including identification safe harbors, cost percentage safe harbors, and a certification safe harbor.

This does not mean independent engineers become tax advisors. The FEOC/PFE compliance, credit eligibility, ownership analysis, and legal conclusions ultimately remain with the taxpayer and its legal and tax advisors.

But the independent engineer’s verified technical record of the project’s FEOC/PFE qualification matters more now. Supplier certifications, for example, cannot be viewed in isolation. Notice 2026-15 allows taxpayers to rely on certain supplier certifications, but not if the taxpayer knows or has reason to know the certification is inaccurate. The guidance also requires certification-related records to be retained for at least six years.

That creates a practical diligence question: do the certifications match the technical record?

A certification may say one thing, but the supporting documents need to be consistent. The contract, purchase order, invoices, manufacturing location, component description, serial numbers, job number, production traveler, supplier attestations, QA/QC records, photographs, packing list, and project allocation records should all tell the same story.

The independent engineer’s role: establish the facts

The role of independent engineers is not to determine tax eligibility. It is not to decide whether a supplier is a prohibited foreign entity. It is not to give legal conclusions on FEOC/PFE compliance.

The IE role with respect to the construction and FEOC/PFE regulations is to inspect, review, verify, and report information.

That includes confirming whether physical work has started on identified components; whether the components observed are tied to the project; whether records support project-specific fabrication; whether the work appears to be outside general inventory; whether serial numbers, fabrication tags, work orders, and QA/QC documents are consistent; and whether there are gaps that should be addressed by the sponsor, supplier, legal counsel, or tax advisor.

This factual role is becoming more valuable because the project record now has to serve multiple audiences. It may be reviewed by tax counsel, lenders, investors, tax equity providers, transferability buyers, insurers, auditors, or future transaction counterparties. Each of those parties may look at the same question differently, but all of them need a clear record.

The biggest preventable risk is inconsistency

Missing information can usually be requested. Inconsistent information is harder to fix.

A missing QA/QC report can be added to the data request list. A missing photograph can sometimes be supplemented. A missing supplier certificate can be requested from the direct supplier.

But when the documents conflict, the issue becomes more serious. For example, if a purchase order identifies one project, a manufacturing traveler (detailed production traceability and routing) identifies another, and the supplier certification uses a generic equipment description, the record becomes harder to rely on. The same is true when a supplier certificate covers a full equipment package, but the inspection only covered selected subcomponents.

These inconsistencies do not automatically mean a project fails any tax requirement. That is not the point. The risk is that the record becomes harder to review, harder to explain, and harder for stakeholders to rely on, resulting in project delays and preventable risk.

What a stronger evidence package should include

A strong Safe Harbor evidence package should be built before the inspection, not after it.

At a minimum, project teams should organize the executed purchase order or binding contract, project entity information, component list, manufacturing schedule, supplier and fabricator details, shop travelers, QA/QC records, inspection records, photographs, serial numbers, fabrication tags, work orders, packing lists, and project allocation records.

Where FEOC/PFE diligence is relevant, the package should also track supplier certifications, direct supplier information, country or facility of manufacture, and any documents used by tax counsel to evaluate MACR or material-assistance exposure.

We ensure that the technical record is organized and clear so that the tax and legal advisors can efficiently do their work and the project can withstand regulatory scrutiny.

Evidence readiness should start early

Project teams should not wait until the week of inspection to build the record. By then, manufacturing may already be complete, components may have moved, documents may be hard to retrieve, and supplier personnel may be focused on the next job.

The better approach is to define the documentation requirements before manufacturing begins. Procurement, engineering, legal, tax, and technical advisory teams should agree on what evidence will be needed, how components will be identified, how project allocation will be shown, and what supplier certifications or supporting records will be requested.

This is especially important for major equipment and subcomponents manufactured through multi-tier supply chains, including transformers, inverters, battery systems, modules, trackers, switchgear, and other high-value equipment.

Conclusion

Safe Harbor is no longer only a deadline exercise. In the FEOC/PFE era, it is also a rigorous documentation exercise.

The key question is not only whether construction has started. The question is whether the project has a factual record that is complete, project-specific, traceable, and internally consistent.

Independent technical review does not replace tax or legal advice. But it can strengthen the factual record that sponsors, lenders, investors, and tax counsel rely on. As the rules continue to evolve, projects with better evidence will be better positioned to manage diligence, financing, tax credit transferability, and future transaction review.

Bureau Veritas Renewable Technical Advisory helps project stakeholders navigate this environment by strengthening the technical evidence record. We do not provide tax or legal conclusions, and we do not determine FEOC/PFE compliance. Instead, we provide independent inspections, documentation review, traceability checks, photographic records, QA/QC review, and factual reporting to fill any gaps to help sponsors, lenders, investors, and tax counsel work from a clearer and more reliable basis.

In the current market, that added discipline matters. Safe Harbor and FEOC/PFE diligence are only as strong as the record behind them. Bureau Veritas helps project teams identify gaps early, reconcile inconsistencies, and organize the evidence needed to support financing, tax credit transferability, and transaction review.