Judge Restores Wind and Solar Tax Credit Safe Harbor After Striking IRS Guidance
A federal judge has vacated IRS guidance that tightened eligibility standards for wind and solar tax credits, restoring a long-standing compliance pathway for renewable-energy developers weeks before a key federal deadline.
Judge Colleen Kollar-Kotelly of the U.S. District Court for the District of Columbia ruled that IRS Notice 2025-42 improperly eliminated the industry’s long-used “5% Safe Harbor” standard without adequately explaining the change. The court found the agency’s action violated administrative-law requirements and sent the issue back for further review.
The guidance had required many projects to rely primarily on physical-construction benchmarks to demonstrate that work had begun. Under the restored framework, developers may again qualify by showing they incurred at least 5% of total project costs before applicable deadlines.
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The dispute centered on IRS Notice 2025-42, issued in 2025 following broader efforts to tighten eligibility requirements for renewable-energy tax incentives. Industry groups, local governments, environmental organizations, and consumer advocates challenged the policy in court, arguing it threatened investment decisions and electricity affordability.
Renewable-energy advocates celebrated the ruling publicly, calling it a significant victory for wind and solar development. Several environmental organizations issued statements describing the decision as a safeguard for projects already underway and for future clean-energy investment.
The decision does not end the dispute. Treasury could appeal, issue revised guidance, or pursue a new rulemaking process. For now, however, developers regain a qualification pathway many considered essential for financing and planning large-scale projects.
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