As new tax-credit rules take effect under the One Big Beautiful Bill Act, FEOC-compliant U.S. solar manufacturers are redefining energy independence and the meaning of “made in America.”
The rules of the game for solar development are changing fast. What once felt like a paperwork detail — where components were made, who owned the factory and which metals crossed which borders — is now central to project financing and tax-credit eligibility.
Two measures at the heart of this transformation — the domestic-content bonus and the Foreign Entity of Concern (FEOC) restrictions introduced under the One Big Beautiful Bill Act — are reshaping how clean energy gets built in America.
For U.S. solar-cell manufacturers committed to full compliance — like ES Foundry (visit our FEOC Compliance Resource Center to find out more) — these policies don’t just raise the bar; they level the field for American manufacturing leadership. Here’s how they differ, why they matter and what they mean for the future of American-made solar power.
Domestic Content: A Bonus for U.S.-Made Materials
The domestic-content provisions, first introduced in the Inflation Reduction Act and reaffirmed under OBBBA, reward developers who use American-made materials. Projects meeting the thresholds can earn up to a 10-percentage-point bonus on the Investment Tax Credit (ITC) or a higher Production Tax Credit (PTC) rate.
Key facts for 2025 projects:
- Projects that begin construction in the second half of 2025 must have at least 45 percent of their manufactured-product costs sourced from the United States, rising to 50 percent in 2026 and 55 percent in 2027 and beyond.
- All steel and iron must be U.S.-made. Manufactured products must meet cost-percentage tests defined by Treasury guidance.
- Developers may use IRS safe-harbor tables to verify compliance.
- Missing the threshold simply forfeits the 10% bonus — it does not disqualify the base 30% credit.
- Limited exceptions remain when U.S. supply is unavailable or would add more than 25 percent to the cost.
Domestic content rewards those investing in local supply — a foundation for energy security and resilience.
FEOC: Hard Restrictions with High Stakes
The new FEOC provisions in OBBBA shift from an incentive to a restriction. Instead of rewarding domestic sourcing, they can disqualify credits for projects or manufacturers linked to prohibited foreign entities.
Key elements:
- Effective dates
- 45X (Manufacturing Credit): applies to components sold in tax years beginning after July 4, 2025.
- 48E/45Y (ITC & PTC): applies to projects that begin construction after December 31, 2025.
- Material assistance ban
- Projects receiving “material assistance” — components, services or financing — from a prohibited foreign entity will lose credit eligibility.
- Non-FEOC content thresholds
- Power projects: 40% in 2026 → 60% by 2029
- Energy storage: 55% in 2026 → 75% by 2029
- Enforcement and recapture
- Violations can trigger credit disqualification or recapture, including a 10-year recapture period for certain ITC projects under 48E.
What’s Still Pending
Treasury and IRS must finalize definitions of “material assistance,” issue component-level safe-harbor tables and clarify ownership and control thresholds. These are expected to be released later in 2025 or in the first half of 2026.
Until final guidance arrives, developers and manufacturers are relying on supplier certifications and self-attestation — creating uncertainty around documentation and compliance standards.
Bottom Line
- Domestic content boosts credit value for projects built with verified U.S.-made materials.
- FEOC rules protect the integrity of clean-energy credits by excluding foreign-controlled inputs.
For FEOC-compliant U.S. manufacturers like ES Foundry, these policies are more than regulations — they are a competitive advantage, proving that America’s solar future can be secure, transparent and truly domestic.