U.S. Court Overturns IRS Rules Restricting Wind and Solar Tax Credits
N.R. Finch
A federal judge struck down an IRS rule that narrowed eligibility for the 30% clean-energy tax credit on wind and solar projects, finding the agency gave no adequate reason to scrap a decade-old "begun construction" definition — developers' project-locking mechanism is temporarily restored, but the final outcome hinges on IRS reconsideration.
What exactly did the court overturn?
Last August the IRS eliminated the "5% cost safe harbor" — a provision that let developers lock in tax-credit eligibility for four years by spending just 5% of a project's total cost upfront.
The new rule restricted that provision to the smallest projects only, effectively shutting most wind and solar developments out of the early-lock pathway.
Judge Colleen Kollar-Kotelly ruled the IRS failed to justify scrapping a decade-old definition, and sent the rule back for "reconsideration."
What does this mean for clean-energy projects?
Under current federal law, clean-energy projects must break ground by July 4 this year or begin operating by the end of 2027 to claim the 30% tax credit plus bonus adders.
This means → the window was already tight; the IRS rule narrowed the entrance further just as the clock was running out — many early-stage projects risked losing eligibility entirely.
With the rule struck down, developers can in theory invoke the "5% cost" provision again to lock in qualification, but what the IRS decides on reconsideration remains unclear — uncertainty is not fully resolved.
Who brought the lawsuit?
The plaintiffs span environmental groups, a city government, and an industry firm: Oregon Environmental Council, Natural Resources Defense Council, Public Citizen, the City of San Francisco, and clean-energy consultancy Woven Energy.
San Francisco City Attorney David Chiu said the ruling is "an important check on government actions that are driving up energy prices for everyday people across the country."
In plain terms = the plaintiffs' core argument is straightforward — restricting the tax credit does not save money; it raises electricity bills, and ordinary consumers foot the difference.
How does this ruling fit the bigger policy battle?
The decision is another judicial setback for the Trump administration on clean energy. The administration has long pushed to curb these credits, calling clean energy "unreliable and unfairly subsidized."
This reflects a recurring dynamic: the executive branch tries to tighten policy fast through administrative rules, while courts demand adequate procedural justification — making due process the most effective shield developers currently have.
The IRS declined to comment on pending litigation; the final outcome remains an open question after the rule is sent back for reconsideration.
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