As of July 2026, the U.S. clean energy tax credit landscape has changed materially following enactment of the One Big Beautiful Bill Act (OBBBA) in July 2025 and subsequent IRS guidance. The key considerations for developers are now eligibility timing, technology, and interaction between credits.
| Credit | Current status | Key planning point |
|---|
| ITC (legacy §48 / technology-neutral §48E) | Still available for many technologies, but wind and solar face accelerated termination rules. Storage generally remains eligible. | Timing of construction and placed-in-service dates are critical. |
| PTC (legacy §45 / technology-neutral §45Y) | Also continues, but wind and solar are subject to the same accelerated phase-out framework. | Evaluate ITC vs. PTC economics early. |
| Section 45Q (Carbon Capture) | Remains in place and continues to be one of the strongest federal incentives for CCS projects. | Often compatible with other non-overlapping incentives. |
ITC/PTC status
The biggest change is that the technology-neutral credits (Sections 48E and 45Y) no longer provide the open-ended runway many developers expected under the Inflation Reduction Act.
For wind and solar, projects placed in service after December 31, 2027 generally lose eligibility if construction began after the statutory cutoff established by OBBBA (effectively one year after enactment). Treasury subsequently issued beginning-of-construction guidance explaining how those rules are applied. Projects that qualify before those deadlines may continue under the applicable continuity rules.
The legislation also introduced foreign entity/material assistance restrictions (FEOC-related rules) that have become an important diligence item for projects beginning construction after the relevant effective dates.
Section 45Q
Section 45Q remains available for qualified carbon capture, utilization, and sequestration projects.
For industrial facilities (cement, steel, chemicals, ethanol, natural gas processing, etc.), 45Q continues to be a major financing tool because it was not subject to the accelerated wind/solar termination provisions. Projects still must satisfy capture thresholds, secure geological storage or qualified utilization, and comply with IRS documentation requirements.
Stacking opportunities
There are still meaningful opportunities, but the "no double benefit" rules remain important.
Generally:
Commonly available combinations
- 45Q + accelerated depreciation (MACRS/bonus depreciation, subject to current law)
- 45Q + many state incentives
- 45Q + grants or utility programs (subject to basis reduction or program-specific rules)
- Federal credits + transferable credit transactions (where still permitted under applicable law)
Generally not allowed
- Claiming both an investment credit and a production credit for the same qualified property.
- Using the same project basis to generate multiple overlapping federal energy credits where the Code expressly prohibits it.
Practical examples
Carbon capture retrofit on a cement plant
- 45Q
- MACRS depreciation
- Potential state CCS incentives
- Potential transferability (depending on the applicable credit and current law)
This is generally one of the strongest stacking cases.
Battery storage
- Technology-neutral investment credit may still be available (subject to current eligibility rules and FEOC requirements).
- State storage incentives may stack.
- Accelerated depreciation typically remains available.
Solar + battery
- Solar eligibility now depends heavily on the project's construction timeline because of the new wind/solar rules.
- Stand-alone storage generally has a more favorable federal outlook than new solar generation under the revised legislation.
What clients are focusing on now
For most renewable energy developers and investors, current diligence centers on:
- Whether the project satisfies the revised beginning-of-construction requirements.
- Whether it can meet the placed-in-service deadlines.
- Compliance with foreign entity/material assistance restrictions.
- Whether 45Q offers a stronger economic case than generation credits for industrial decarbonization projects.
- Interaction with state incentives and depreciation.
For project finance transactions, the stacking analysis has become much more project-specific than it was under the original IRA framework.
If your client is developing a specific asset type (e.g., utility-scale solar, wind, battery storage, renewable natural gas, blue hydrogen, ethanol with CCS, DAC, or industrial carbon capture), I can walk through the applicable credit combinations and identify which stack is typically available under current law.
