A federal judge in Washington D.C. struck down a Trump administration rule on Saturday that restricted how renewable energy projects qualify for construction tax credits, ruling it was an "arbitrary and capricious" change to a long-standing IRS policy. The decision by Judge Colleen Kollar-Kotelly is a legal win for wind and solar developers, but comes less than a month before a hard legislative deadline on July 5 that could phase out the credits entirely under the GOP's 'Big Beautiful Bill'.
At the center of the dispute is a simple question: what counts as starting construction? Since 2013, the Internal Revenue Service has recognized two pathways for projects to lock in eligibility for critical tax credits. A developer could begin "physical work of a significant nature" on site.
Or, they could spend at least five percent of a project's total cost on equipment and planning. That second pathway, the Five Percent Safe Harbor, was the target of the Trump administration's guidance. The administration's rule eliminated it entirely.
Only physical work would count. The Treasury Department acted under a directive from President Trump, who demanded the IRS limit the credits by "restricting the use of broad safe harbors unless a substantial portion of a subject facility has been built." The result was a narrower door for developers, and one slammed shut for many solar projects that rely on equipment purchases as their first big step, The Hill reported. Judge Kollar-Kotelly called the move indefensible. "The Notice's elimination of the Five Percent Safe Harbor is a significant change in the IRS's position on what it means to 'begin construction' for purposes of clean energy tax credits," she wrote in her ruling.
The agency, she found, offered no real explanation for the pivot. "Because neither the Notice nor the administrative record provides an explanation from which 'the agency's path may reasonably be discerned' in light of all the facts and circumstances, the Notice is arbitrary and capricious."
Kollar-Kotelly herself acknowledged the limited power of her own decision. The July 5 legislative deadline looms. Projects must start construction by that date to get the credits at all, under the phase-out timetable written into the One Big Beautiful Bill Act.
Renewable developers, she wrote, likely "will need to await the outcome of an appeal" before they can make investment decisions with any certainty. "Unfortunately, significant uncertainty will exist no matter how this Court resolves this case and what remedy it awards," Kollar-Kotelly wrote. "It is likely that market participants will need to await the outcome of an appeal before they will have certainty about the legal effect of the Notice."
This is bureaucracy with a body count of dollars and jobs. A project costing $200 million needs to spend $10 million on equipment and design before it is technically "under construction." For months, those checks could not safely be written. Some developers reported freezing plans.
The ruling says the old rule is back. But the clock is still ticking, and an appeal from the Trump administration is almost certain. An IRS spokesperson declined to comment on the ruling, telling The Hill the agency does not discuss pending litigation.
The spokesperson would not say whether the agency would immediately begin honoring the Five Percent Safe Harbor or wait for the appeal to play out. Jana Gastellum, executive director of the Oregon Environmental Council, one of the groups that sued the administration, welcomed the ruling as a pocketbook issue. "This is a huge win for clean energy development, and for everyone already feeling the impacts of rising electricity costs," she said in a written statement. "The IRS guidance that hindered these technologies was just another example of the federal administration causing energy market chaos. Saturday's decision removes that barrier."
The Big Beautiful Bill itself represents the heavier artillery in the fight over renewables. Signed into law last year, it phases out the tax credits for wind and solar according to a strict timeline: projects must start construction before July 5, 2026, or be placed in service before 2028. It was the Trump administration's signature legislative blow against an industry it has targeted since returning to power.
The tax credit fight is just one front in a broader campaign. The administration has also moved to slow renewable energy through permit revocations and procedural delays. The strategy creates a cumulative chilling effect.
Uncertainty is a cost all its own. The ruling came on Saturday. June has four weeks left.
For developers weighing whether to order millions in solar panels or sign a turbine contract, the math looks like this: a favorable judge, but a hostile clock, and an appeal that could reverse everything. Spending the five percent now might secure the credit. It might not.
No one can tell them for sure. The policy says one thing. The reality says another.
What this actually means for your family traces through to your electric bill. When projects stall, new supply does not come online. Older, more expensive plants fill the gap.
Gastellum framed the ruling explicitly in those terms. Delays and regulatory chaos answer to nobody, but they show up as line items on a utility statement. The legal reasoning behind Kollar-Kotelly's ruling is narrow and administrative.
It does not question Congress's power to end the credits. It affirms that when a statute gives the IRS discretion, the agency must explain its choices logically. A change this sharp, without documented reasoning, fails the basic test of administrative law.
The judge, appointed by President Bill Clinton, has handled complex regulatory cases for decades. Her ruling is likely to be appealed to the D.C. Circuit Court of Appeals, which would hear the case on an expedited calendar given the approaching deadline.
A stay of her ruling could come within days, reinstating the physical-work-only rule while the appeal runs. Key Takeaways: - A D.C. - An appeal from the Trump administration is considered likely, meaning developers will face continued uncertainty. - The Oregon Environmental Council and other groups say the ruling is a win for consumers facing rising electricity costs. Why It Matters: The ruling determines whether billions of dollars in planned wind and solar projects can financially justify breaking ground before July 5.
If the appeal reinstates the restrictive rule and the deadline passes, a wave of projects could be canceled, costing thousands of construction and manufacturing jobs and reshaping the U.S. energy mix for a decade. The days ahead are a scramble. Developers and their lawyers are reading the ruling for clues about timing.
Circuit issue a stay? Will the IRS issue interim guidance? For an industry built on long-range planning, the next four weeks will feel like a high-wire act in a hurricane.
Legal observers expect the administration to argue that Kollar-Kotelly overstepped, that the policy change was a reasonable interpretation of the President's directive. The environmental groups will argue the opposite: that the agency cannot offer a new meaning of "begin construction" without explaining why decades of precedent are suddenly wrong. Both sides claim victory.
Here are the numbers: a court win with a 26-day shelf life before the legislative deadline arrives. After July 5, the whole argument becomes academic for any project that has not yet met the construction threshold. The real-world effect of the judge's ruling may be measured in how many projects can rush to spend five percent in the brief window before time runs out.
Key Takeaways
— A D.C. federal judge restored the IRS's Five Percent Safe Harbor rule for renewable tax credits, calling Trump's guidance to eliminate it 'arbitrary and capricious.'
— The legal win does not change the July 5 construction deadline required by the 2025 One Big Beautiful Bill Act, which phases out the credits.
— An appeal from the Trump administration is considered likely, meaning developers will face continued uncertainty.
— The Oregon Environmental Council and other groups say the ruling is a win for consumers facing rising electricity costs.
Source: The Hill
