The Impact of One Big Beautiful Bill on Renewable Energies

December 10, 2025

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The One Big Beautiful Bill Act (OBBBA), enacted July 4, 2025, brings sweeping changes to U.S. renewable energy tax credits, with major implications for project developers, investors, and the tax equity market.

The OBBBA law accelerates the expiration of key credits, imposes new and complex Foreign Entity of Concern (FEOC) restrictions, and modifies the rules for direct pay and transferability. Below is a comprehensive analysis of these changes, organized by topic and credit type, with attention to legal details, timelines, and market implications.

Accelerated Expiration of Renewable Energy Tax Credits

Technology-Neutral Credits  Section45Y (PTC) and Section48E (ITC)

Wind and Solar Projects:

Accelerated Phaseout: For wind and solar, the Section 45Y Production Tax Credit (PTC) and Section 48E Investment Tax Credit (ITC) are now unavailable for facilities placed in service after December 31, 2027, unless construction began on or before July 4, 2026 (12 months after enactment)  [5].
Safe Harbor/Grandfathering: Projects that begin construction by July 4, 2026, are not subject to the end-of-2027 placed-in-service cliff. The IRS’s existing “beginning of construction” (BOC) guidance (e.g., 5% safe harbor, physical work test) is codified for FEOC purposes, but an executive order directs Treasury to issue stricter guidance to prevent abuse, so developers must monitor for new rules  [5].
Other Technologies: For other eligible technologies (e.g., geothermal, hydropower, energy storage), the original IRA phaseout schedule generally remains, with credits available for projects beginning construction through 2033, then phasing down [4].

Residential Clean Energy Credits:

Residential Clean Energy Credit(Section 25D) : Expires for expenditures made after December 31, 2025.
 Energy Efficient Home Improvement Credit(Section 25C): Expires for property placed in service after December 31, 2025.
New Energy Efficient Home Credit(Section 45L): Expires for homes acquired after June 30, 2026 [4].
Electric Vehicle and Charging Credits:
 Clean Vehicle Credit (Section 30D), Used EV Credit (Section 25E), Commercial EV Credit (Section 45W): All expire for vehicles acquired after September 30, 2025.
 Alternative Fuel Vehicle Refueling Property Credit(Section 30C): Expires for property placed in service after June 30, 2026 [4].

Other Credits:

 Carbon Oxide Sequestration(Section 45Q): No change to expiration, but see FEOC restrictions below.
 Zero-Emission Nuclear(Section 45U): No change to expiration; credit remains through 2032.
 Clean Hydrogen(Section 45V): Now expires for facilities beginning construction after December 31, 2027 [5].
 Advanced Manufacturing(Section 45X): Wind components lose eligibility after 2027; metallurgical coal added as eligible through 2029; phaseouts for other components and minerals as specified [4].
 Clean Fuel Production(Section 45Z): Extended through December 31, 2029, with new restrictions on feedstock sourcing and emissions rates [5].

Expanded Foreign Entity of Concern (FEOC) Restrictions

Overview of FEOC Rules

The OBBBA introduces a multi-layered FEOC regime, which applies to most major energy credits (notably 45Y, 48E, 45X, 45Q, 45U, and 45Z). The rules operate through three main mechanisms:

Ownership/Control Prohibition: Credits are denied if the taxpayer is a “specified foreign entity” (SFE) or a “foreign-influenced entity” (FIE). SFEs include entities from or controlled by China, Russia, Iran, or North Korea, as well as those on certain U.S. government lists. FIEs are defined by ownership, board appointment, or debt thresholds, or by contractual arrangements granting “effective control” to an SFE [4].
Material Assistance Rule: For projects beginning construction after December 31, 2025 (or for 45X, for components sold after July 4, 2025), credits are denied if the project receives “material assistance” from a prohibited foreign entity. This is measured by a “material assistance cost ratio” (the percentage of total direct costs attributable to non-FEOC sources), with threshold percentages increasing over time (e.g., 40% in 2026, 45% in 2027, etc. for 45Y/48E) [5].
Effective Control Rule: Credits are denied if, through contracts or licensing, an SFE has effective control over the project or component production, even absent majority ownership [6].

Safe Harbor and Transition:

For projects with binding written contracts before June 16, 2025, and placed in service before January 1, 2030 (or January 1, 2028, for wind/solar), certain components may be excluded from the material assistance calculation.

Until Treasury issues new safe harbor tables (due by December 31, 2026), taxpayers may rely on existing domestic content safe harbor tables and supplier certifications [5].

Penalties and Enforcement:

Six-year statute of limitations for IRS assessment of deficiencies related to FEOC/material assistance violations.

Accuracy-related penalties apply at a lower threshold (1% understatement triggers a 20% penalty for disallowed credits).

Suppliers making false certifications face penalties of the greater of $5,000 or 10% of the underpayment [4].

Direct Pay and Transferability

A. Direct Pay (Section 6417)

Preserved: The OBBBA retains the direct pay (elective payment) option for eligible credits, including 45Y, 48E, 45Q, 45U, 45X, and 45Z, for the duration of the credit period.

FEOC Limitation: Direct pay is not available to SFEs or FIEs for the affected credits [5].

B. Transferability (Section 6418)

Preserved: Transferability of credits remains in place for the duration of the credit period, allowing eligible taxpayers to sell credits for cash to unrelated parties.

Restriction: Credits cannot be transferred to SFEs for 45Y, 48E, 45Q, 45U, 45X, and 45Z. This restriction applies to both the seller and the buyer, so diligence is required to ensure the transferee is not a prohibited entity [4 ].

The Renewable Energy Landscape Is Shifting Fast. Is Your Organization Prepared?

The OBBBA is reshaping how renewable energy projects are financed and developed, aecting timelines, supply chains, tax equity structures, and long-term planning. Staying compliant and competitive now requires a clear understanding of these changes and their impact on your projects.

Rubino has deep experience supporting companies across the renewable energy sector. We help organizations navigate, optimize, and plan confidently for the road ahead.

Gain clarity. Enhance eciency. Support sustainable growth. Contact us!

Implications for Tax Equity Markets and Project Finance

A. Market Disruption and Diligence

Accelerated Timelines: The shortened window for wind and solar projects to begin construction and be placed in service (with a hard end-of-2027 cliff for most new projects) creates urgency for developers and investors to accelerate project timelines and safe harbor strategies [5].

FEOC Compliance: The new FEOC rules require extensive diligence on ownership, supply chains, and contractual arrangements. Tax equity investors and lenders will need to implement robust diligence protocols to avoid tainting credits, including reviewing supplier certifications and monitoring for changes in ownership or control [3].

Transferability Constraints: The inability to transfer credits to SFEs may reduce the pool of potential buyers, potentially affecting pricing and liquidity in the tax credit market [4].

Direct Pay as a Backstop: For some projects, direct pay remains a viable alternative to tax equity, especially for tax-exempt entities, but only if FEOC restrictions are satisfied.

B. Project Structuring and Safe Harbor

Grandfathering: Projects that began construction before the new deadlines (generally by the end of 2024 for legacy credits, or by July 4, 2026, for 45Y/48E wind and solar) are generally not subject to the new FEOC/material assistance rules and can avoid the new placed-in-service cliff.

Supply Chain Planning: Developers must reassess procurement strategies to ensure compliance with material assistance thresholds, especially as the required non-FEOC content percentage increases over time.

Contractual Protections: Tax equity documents will likely require enhanced representations, warranties, and indemnities regarding FEOC status and supply chain compliance.

C. Market Outlook

Tax Equity Supply: The accelerated phaseout and FEOC restrictions may reduce the number of eligible projects and buyers, potentially tightening the tax equity market for wind and solar after 2027.

Pricing: Increased compliance costs and risk of recapture or disallowance may lead to higher required returns for tax equity investors and lower net proceeds for developers.

Shift to Other Technologies: With wind and solar credits curtailed, tax equity and project finance may shift toward technologies with longer credit windows (e.g., nuclear, hydropower, geothermal, energy storage, clean fuels), provided FEOC compliance can be maintained.

Credit-Specific Highlights

A. Wind and Solar(Section 45Y/48E)

Placed-in-service deadline: End of 2027 for most new projects; safe harbor for those beginning construction by July 4, 2026.

FEOC/material assistance rules: Apply to projects beginning construction after December 31, 2025.

Transferability/direct pay: Preserved, but not to SFEs/FIEs.

B. Residential(Section 25D/25C/45L)

Expiration: End of 2025 for most credits; mid-2026 for 45L.

Leased residential solar: Only solar water heating and small wind property are excluded from credits if leased; residential solar electric property remains eligible.

C. EVs and Charging(Section 30D/25E/45W/30C)

Expiration: End of September 2025 for vehicles; mid-2026 for charging equipment.

D. Other(Section 45Q/45U/45V/45X/45Z)

45Q/45U: FEOC restrictions apply, but no material assistance rule.

45V: No FEOC/material assistance restrictions, but credit expires for facilities beginning construction after 2027.

45X: Wind components lose eligibility after 2027; FEOC/material assistance rules apply.

45Z: Extended through 2029; FEOC restrictions apply; new feedstock and emissions rules.

Practical Steps for Stakeholders

Immediate Action: Developers and investors should review project timelines to ensure construction begins before the new deadlines and to maximize eligibility for credits under the old rules.

Diligence: Implement robust FEOC compliance protocols, including supply chain mapping, ownership tracing, and contractual protections.

Monitor Guidance: Treasury is expected to issue further guidance on BOC, safe harbors, and FEOC/material assistance compliance; stakeholders must stay updated.

Market Strategy: Consider shifting focus to technologies with longer credit windows and less exposure to FEOC/material assistance rules.

Conclusion

The OBBBA fundamentally reshapes the landscape for renewable energy tax credits in the U.S. by accelerating the expiration of key credits, imposing stringent FEOC restrictions, and modifying the rules for direct pay and transferability. Wind and solar projects face the most immediate impact, with a hard-placed-in-service deadline and new compliance burdens. The tax equity market will need to adapt to a smaller pool of eligible projects, increased diligence requirements, and new risks of recapture or disallowance. Developers, investors, and tax equity providers must act quickly to secure grandfathered status for projects, reassess supply chains, and update transaction structures to comply with the new law [5] [4] [6] [7] [3].