In a recent development, the Internal Revenue Service (IRS) updated its guidance regarding the beginning of construction (BOC) requirements for solar and wind energy projects. This move is particularly significant as it outlines new stipulations under sections 45Y and 48E of the Internal Revenue Code, impacting how energy developers can qualify for tax credits. While much of the existing BOC guidance remains unchanged, a notable exception has been made that restricts the application of a previously utilized safe harbor provision. This article will explore the key aspects of this new IRS Notice, its implications for solar and wind projects, and what stakeholders need to know to navigate these updated requirements effectively.
Understanding IRS Notice 2025-42
On August 15, 2025, the IRS released Notice 2025-42 to clarify the BOC requirements related to solar and wind projects. The notice reiterates most of the prior guidance associated with tax credits available under sections 45 and 48 but introduces a critical change: the five percent safe harbor will now exclusively apply to solar installations with a nameplate capacity of no more than 1.5 MW AC. Wind projects are excluded from this safe harbor entirely.
This notice applies specifically to all solar and wind initiatives where BOC has not yet been established as per previous IRS guidelines by September 2, 2025. It’s essential for developers in this sector to understand that any project beginning construction after this date or not adhering to these updated guidelines may lose eligibility for available tax credits.
The Impact of OBBBA on Tax Credits
Further complicating matters is legislation known as the One Big Beautiful Bill Act (OBBBA), which aims at curtailing tax incentives for renewable energy projects. Under this act, credits will be eliminated for any solar or wind project where BOC occurs on or after July 4, 2026, or if they are placed into service post-December 31, 2027. However, exceptions exist: projects that meet earlier deadlines retain their eligibility.
This legislative backdrop emphasizes the urgency for developers to act swiftly if they wish to secure these vital financial incentives before changes take effect.
The Five Percent Safe Harbor Explained
Historically, developers could confirm BOC by incurring at least five percent of total project costs—such as expenses related to purchasing equipment like transformers or turbines—for both solar and wind initiatives. However, with Notice 2025-42 in effect:
- The five percent safe harbor is eliminated for all wind projects regardless of output capacity.
- For solar projects exceeding a maximum net output greater than 1.5 MW AC, this safe harbor no longer applies either.
This means that only “low output” solar facilities—those generating up to and including 1.5 MW AC—can still leverage this provision in determining their eligibility for tax credits.
Navigating Construction Requirements: Physical Work Test
An important aspect retained from previous guidance is the physical work test—a requirement designed to ensure that tangible construction activities commence significantly on-site or off-site. This includes activities such as:
- Installation of support structures or photovoltaic panels.
- Excavation work necessary for foundations intended for turbines.
- Manufacturing components like inverters or transformers provided those parts are not held in inventory by manufacturers during construction periods.
The emphasis here is less on cost incurred during initial phases but rather on actual physical progress being made toward project completion—an essential consideration moving forward under these new guidelines.
Continuity Requirement and Safe Harbor Provisions
The continuity requirement—a stipulation mandating ongoing efforts towards completing construction—is also preserved in its current form within Notice 2025-42. Developers must maintain continuous progress post-BOC; otherwise, they risk losing access to available tax benefits based on relevant circumstances surrounding their project’s timeline.
A specific safe harbor condition indicates that if BOC occurs within a given year (for instance August 20th in our example), then placement into service must occur within four years following that date—from August into December four years later—to comply with federal regulations pertaining specifically towards renewable energy initiatives.
Conclusion: Preparing for Compliance Amidst Change
The recent updates from the IRS regarding beginning construction rules signify critical changes that could reshape how stakeholders approach investment strategies within renewable energy sectors such as solar and wind power generation. Understanding these nuances will be essential not only to harness available financial incentives but also ensure compliance going forward amid evolving regulations stemming from both administrative actions like Executive Orders alongside legislative shifts via bills such as OBBBA.
Watch our video explanation here!