Domestic content has moved from being merely a modeling upside to a procurement, financing and execution issue. For developers and asset owners planning 2026, 2027 and 2028 projects, the question is “Can we qualify for the domestic content bonus in a way that protects project economics, keeps procurement flexible and holds up in diligence?”
That shift matters because the thresholds are rising. For most solar projects beginning construction in 2026, the domestic content requirement for manufactured products moves to 50%. In 2027 and beyond, it increases to 55%. At the same time, FEOC-related review is becoming a bigger part of supplier qualification, financing discussions and tax-credit risk assessment.
That combination is changing how teams think about U.S.-made cells.
Domestic cells are one of the most effective levers developers can use to move a project’s domestic content percentage higher, especially because modules are typically one of the largest manufactured-product cost categories in a solar project.
Domestic Content Is a Project-Level Strategy
One of the biggest misconceptions in the market is that domestic content is all or nothing.
Many developers assume they either need to use modules with domestic cells across the full project or skip the domestic content bonus altogether. That assumption can lead to unnecessary costs, limited procurement options and avoidable schedule risks. The more practical approach is to treat domestic content as a weighted project-level calculation.
As thresholds rise, developers generally have two paths: Increase the domestic contribution from balance-of-system components or increase the contribution from modules. In many cases, modules are the stronger lever because they represent such a large share of the manufactured-product cost stack.
For many real-world projects, reaching the threshold may mean using a meaningful share of U.S.-made modules with U.S.-made cells, depending on cost structure, module pricing, inverter and racking selections and other eligible domestic content inputs.
The exact percentage will vary, but the strategy should not: Model early, understand the weighted contribution and use domestic cells where they create the most value.
Blending Is the Practical Path
Domestic content planning works best when it is treated like any other high-stakes project workstream: financing, interconnection, EPC risk or COD certainty.
The objective is to qualify for the bonus without introducing unnecessary costs, availability or execution risks.
That is where blended procurement matters.
A project may not need 100% of its modules to include U.S.-made cells to meet the domestic content threshold. But as requirements rise, the share of modules with higher domestic contribution will likely need to increase.
Used correctly, a blended strategy can help developers place U.S.-made cells where they have the most impact, while preserving flexibility elsewhere in the equipment stack.
That matters because waiting now creates risk. Demand for bankable U.S.-made cells is rising. FEOC and PFE-related diligence is becoming more detailed. Tax equity, lenders and insurers are asking harder questions. And trade and tariff uncertainty continue to affect procurement confidence.
In this environment, domestic content cannot be left until the end. It needs to be modeled early and documented from the start.
Why This Matters Now for DG and Utility-Scale Pipelines
The near-term opportunity is especially important for Tier 1 distributed generation companies developing projects in the 1-50 MW range.
These are active projects with immediate procurement needs, shorter development cycles and tighter timelines to secure equipment that supports both domestic content and domestic assembly goals. In this segment, U.S.-made cells can help developers move quickly with a practical blended strategy that balances qualification, cost, availability and schedule.
For utility-scale developers, the timeline looks different, but the need to plan is just as important. Projects expected to move forward in 2027 and 2028 should be modeled now, before procurement options narrow and financing diligence intensifies.
The common thread across both segments is blending.
Whether a developer is moving quickly on a 5 MW DG project or planning a large utility-scale portfolio, the goal is the same: Design a procurement strategy that meets domestic content requirements without forcing an all-or-nothing equipment decision.
Where ES Foundry Fits
ES Foundry helps developers, module partners and asset owners execute this strategy with confidence.
We manufacture U.S.-made crystalline solar cells designed to support domestic content strategies and FEOC-aligned procurement planning. For customers navigating future project pipelines, ES Foundry’s cells can serve as a high-impact domestic content lever within a broader blended procurement strategy.
ES Foundry was also built for this moment.
We are FEOC-free from inception (find out more here), with a U.S.-based ownership and leadership structure, domestic operations and a transparent approach to sourcing and documentation. That matters because domestic content and FEOC diligence are increasingly part of the same project risk review.
Developers do not just need components that help them model toward the threshold. They need suppliers that can support the traceability, consistency and documentation required by financing partners.
Three Questions to Ask Now
Before procurement is locked, developers should ask:
- How much of the project needs U.S.-made modules with U.S.-made cells to reach the applicable threshold?
- Which substitutions could change the domestic content outcome?
- Who owns the documentation package across development, EPC, procurement and finance?
Answering these questions early can help teams avoid late-stage surprises and build a more defensible path to qualification.
The Takeaway
Domestic cells are becoming one of the most important levers in solar project planning, but they do not require an all-or-nothing procurement decision.
The smarter approach is to design for the threshold early, model the project realistically and execute with suppliers that can support both performance and documentation.
For Tier 1 DG companies working in the 1 MW to 50 MW range, the need is immediate. For utility-scale partners planning 2027 and 2028 pipelines, the work should begin now.
Connect with ES Foundry at ACP CLEANPOWER 2026
Planning to attend ACP CLEANPOWER 2026 in Houston?
The ES Foundry team will be in Houston June 1–6 to talk through how U.S.-made, FEOC-free cells can support a blended procurement strategy for domestic content. Whether you’re moving quickly on distributed generation projects or planning utility-scale portfolios for 2027 and 2028, our team can help you evaluate availability, documentation needs and practical paths to qualification.
Stop by Booth 2224 or email Sales.Team@ESFoundryCorp.com to set up a meeting.
And don’t miss Sekhar Tatineni, Vice President of Technology at ES Foundry, who will be presenting on Wednesday, June 3, from 10:45–11:30 a.m. CT on “What’s Realistically Next for U.S. Solar Cells: How PERC, TOPCon, HJT and Back-Contact Will Shape Domestic Manufacturing.”
Disclaimer
This article is for informational purposes only and does not constitute tax, legal or financial advice. Domestic content eligibility depends on project-specific facts and applicable IRS and Treasury guidance. Developers and asset owners should consult qualified tax counsel, financing partners and other advisors when evaluating domestic content and FEOC-related procurement strategies.