For most of the clean energy industry’s recent history, the question of where components came from was largely a procurement concern: price, lead time, availability. Whether a solar cell was manufactured in China or Ohio did not change whether a project qualified for a tax credit. That is no longer the case. The foreign entity of concern rules introduced and substantially expanded through 2025 have made supply chain origin a financial and legal variable that determines credit eligibility entirely.
In 2026, FEOC compliance is not a peripheral consideration. For developers, manufacturers, and tax equity investors in clean energy, it sits at the centre of project economics.
What FEOC Actually Means
The term foreign entity of concern refers to entities owned by, controlled by, or subject to the jurisdiction of a covered nation. The covered nations are China, Russia, North Korea, and Iran. The definition extends beyond direct government ownership. An entity qualifies as a FEOC if a covered nation’s government holds 25% or more ownership or control, or if the entity operates under certain licences or contracts with a FEOC, a provision designed to capture arrangements where control is exercised indirectly through commercial agreements rather than equity stakes.
The One Big Beautiful Bill Act, signed into law on 4 July 2025, significantly expanded FEOC restrictions beyond their original scope under the Inflation Reduction Act. Where the IRA applied FEOC rules narrowly to the Section 30D clean vehicle credit, the OBBBA extended them to the 45X Advanced Manufacturing Production Credit, the 45Y Technology-Neutral Production Credit, the 48E Technology-Neutral Investment Credit, and others. For tax years beginning after 4 July 2025, which for most calendar-year taxpayers means 2026 onwards, these restrictions apply in full.
The Material Assistance Cost Ratio and FEOC Thresholds
The mechanism through which FEOC compliance is measured is the material assistance cost ratio, or MACR. This calculates the proportion of a project’s total direct material costs attributable to prohibited foreign entities. When that proportion exceeds the applicable threshold, the project loses eligibility for the relevant credit.
Thresholds vary by technology and tighten annually. For qualified wind and solar facilities under 48E, the non-prohibited percentage must reach at least 40% in 2026, rising by 5 percentage points each year through 2030. Energy storage projects face a stricter starting point of 55% in 2026, also increasing annually. For inverters, the threshold rises from 50% in 2026 to 70% in 2030. Each year without supply chain restructuring makes compliance harder, not easier.
Treasury and the IRS released interim material assistance guidance and safe harbour tables in mid-February 2026, providing clarity the industry had been waiting for since the OBBBA was enacted. The safe harbour approach allows developers and manufacturers to use standardised cost ratios rather than tracing every dollar through multi-tier supply chains, a practical concession to the complexity of global manufacturing, though it does not eliminate the underlying compliance burden.
Why This Is Harder Than It Looks
Solar manufacturing illustrates the challenge clearly. Even when a module is assembled outside a covered nation, the cells, wafers, and polysilicon upstream may still trace back to Chinese supply chains. China currently dominates global production of these upstream materials, accounting for over 80% of global supply in some categories. A project using modules assembled in South-East Asia by a non-covered entity can still fail the MACR test if the cells inside those modules were produced by a FEOC.
Analysts have noted that cells often represent 40 to 60% of the MACR calculation for solar projects, making cell sourcing the single most important FEOC compliance variable for most solar developers in 2026. Because most cells currently originate from covered nations, meeting the threshold is not straightforward even for projects that appear clean at the module level.
The battery storage sector faces similar pressure. The lithium-ion battery supply chain is heavily concentrated in China, and sourcing equivalent components from non-covered entities frequently carries a cost premium of 30 to 50%. Companies restructuring procurement are not just navigating compliance; they are absorbing higher costs that flow directly into project economics and financing assumptions.
The Ownership and Control Dimension
Beyond the supply chain MACR, the OBBBA introduced ownership and control restrictions that operate independently. An entity with a FEOC holding significant ownership, voting power, or governance rights including board seats or veto powers may be barred from claiming affected credits regardless of its supply chain position. These rules look through multi-tier corporate structures, making beneficial ownership analysis a compliance requirement, not just an investor relations exercise.
Only 38% of companies surveyed by Crux in late 2025 described themselves as fully prepared for 2026 FEOC compliance, despite most having begun building frameworks. That gap between having a framework and being genuinely compliant reflects the difficulty of the task, particularly for organisations that have not historically needed to map supply chains at the component level.
Conclusion: Every Sourcing Decision Is Now a Compliance Decision
FEOC rules have fundamentally changed the financial calculus of clean energy development. Supply chain origin is no longer a procurement variable; it is a credit eligibility variable, and the two cannot be managed separately.
The compliance window is compressing. Existing contracts finalised before 16 June 2025 carry an exemption for the components they cover, but new procurement decisions do not. Treasury is expected to open a formal rulemaking process in Q2 2026, and while final rules are anticipated to prioritise administrability over a punitive approach, that outcome does not reduce the urgency of acting now.
For developers and manufacturers who have not yet conducted a thorough FEOC supply chain audit, the cost of delay is measurable: credit disqualification, financing disruption, and procurement decisions made without full visibility of their compliance implications. Every sourcing decision made from 2026 onwards is a FEOC compliance decision, whether it is treated as one or not.
