Will Congress pass legislation materially modifying IRA Section 45U nuclear production tax credits by end of 2026?

IRA Section 45U nuclear production tax credits have bipartisan support — nuclear energy is increasingly seen as essential for both clean energy and data center power demand. Nuclear-specific credits are politically easier to defend than solar/wind credits, which face more partisan opposition. Congress has struggled to pass comprehensive energy legislation, and budget reconciliation processes have been consumed by other priorities. The question requires Congress to both pass legislation AND have the President sign it by end 2026 — a high bar for any legislative action, let alone modification of a popular nuclear provision. Possible in a budget reconciliation package but unlikely as standalone legislation.

Budget reconciliation is the main vehicle for IRA modifications. If a reconciliation bill moves in 2026 (possible in an election-adjacent year), IRA clean energy provisions could be used as pay-fors. Nuclear-specific credits might be modified as part of a broader IRA reform package. The question requires 'material modification' that reduces PTC value by >10% — this is a meaningful threshold that requires more than minor technical adjustments. However, phase-out threshold changes for profitable nuclear operators (like Vistra, which generates significant earnings) are plausible — the IRA designed PTCs to phase out as nuclear plants become more profitable, and Congress could accelerate this phase-out. Lower confidence due to legislative uncertainty.

The legislative process for modifying specific tax code provisions is slow and unpredictable. Nuclear PTCs have strong industry lobbying support from both nuclear operators and their hyperscaler customers (Amazon, Meta, Google all want cheap nuclear power). Data center demand narrative actually strengthens the political case for nuclear PTCs. The question has a specific resolution requiring >10% reduction in PTC value — minor technical modifications wouldn't qualify. Full repeal is extremely unlikely. The most plausible path is budget reconciliation, but nuclear provisions are more likely to be protected than solar/wind provisions. Low probability.

Congressional action on IRA modifications has been slow despite rhetoric. The nuclear-specific credits enjoy bipartisan support that solar/wind credits lack. Passing legislation requires both chambers and presidential signature — the legislative machinery is simply too slow for this to happen by end 2026 absent a major reconciliation vehicle. Even if reconciliation moves, nuclear provisions are more likely to be expanded (to support data center demand) than reduced. The >10% value reduction threshold is meaningful and unlikely to be crossed.

There's a non-trivial chance that a budget reconciliation package in 2026 includes IRA modifications. The political environment is dynamic and energy policy is contentious. Nuclear PTCs could be caught up in broader IRA reform even if nuclear-specific provisions have bipartisan support. The transferability rules specifically could be targeted — reducing PTC value by making credits less liquid without formally reducing the credit amount. However, the full legislative process by end 2026 is a tight timeline. Lower confidence reflects genuine political unpredictability.

Nuclear energy is having a political moment — bipartisan support driven by data center demand, energy security, and clean energy goals. This is the worst possible time to modify nuclear PTCs. Even politicians who want to reform the IRA broadly would likely protect nuclear provisions. The question requires actual signed legislation, not just proposals or committee votes. The probability of full legislative action by end 2026 is low for any specific tax provision modification.

Nuclear PTCs have bipartisan support. Data center narrative strengthens the case. Legislative process is slow. Full passage by end 2026 is unlikely. Low probability event.

Budget reconciliation is the main risk. IRA modifications could be used as pay-fors. But nuclear provisions are politically protected relative to other clean energy credits. The >10% reduction threshold is high. Legislative uncertainty warrants some probability.

Nuclear PTCs are among the best-protected IRA provisions. Industry lobbying from nuclear operators and hyperscalers is strong. Congress has other priorities. Full legislative modification by year-end is a low probability scenario.