U.S. fusion energy programs face a constrained financial outlook as the House Appropriations Committee advanced a bill proposing $773 million for the Department of Energy's Fusion Energy Sciences (FES) office for fiscal year 2025. This figure represents a minor increase over the current $763 million but is substantially below the administration's $1.05 billion request. The proposed budget reflects persistent fiscal pressures and a decade of essentially flat funding for FES when adjusted for inflation. A significant point of contention is the allocation for the international ITER project, which the House bill cuts to $107 million from a requested $282 million, signaling legislative unease with the project's escalating costs and revised schedule. Source: Aip

The international ITER project in France is undergoing a major re-baselining of its cost and schedule, with a new projection expected in late 2024. This revision is driven by significant technical challenges, including manufacturing defects in vacuum vessel sectors and thermal shields, and a strategic decision to replace the first wall's beryllium components with tungsten. Tim Luce, chief scientist for the U.S. contribution to ITER, confirmed these issues during a Fusion Energy Sciences Advisory Committee meeting. The U.S. contribution to the project is legally capped at $6.5 billion by the Energy Act of 2020, a ceiling that the project is now approaching, raising critical questions about future U.S. participation and financial liability. Source: Aip

The international ITER project in France is undergoing a major re-baselining of its cost and schedule, with a new projection expected in late 2024.

Domestic initiatives are also impacted by the proposed budget. The Milestone-Based Fusion Development Program, designed to accelerate commercial fusion through public-private partnerships, is slated to receive only $85 million in the House bill. This is less than half of the $180 million appropriated over its first two years and far from the $200 million per year originally envisioned to support its eight selected companies, which include Commonwealth Fusion Systems and Xcimer Energy. FES Director Jean Paul Allain noted that at this funding level, the program can only support two or three of the eight companies, forcing difficult choices that could slow the pace of private-sector development in the U.S. Source: Aip

The budget constraints are forcing a strategic re-evaluation within the FES program, guided by the 2020 FESAC long-range plan. This plan recommended the U.S. remain in ITER while simultaneously pursuing a domestic fusion pilot plant. However, the plan assumed robust budget growth that has not materialized. The current fiscal reality creates a direct tension between funding the U.S. domestic program, including the milestone-based initiative and foundational science, and fulfilling international commitments to ITER. The FES Advisory Committee has been tasked with providing guidance on how to navigate these competing priorities under a flat-budget scenario, a task that will shape the direction of U.S. fusion research for the next decade. Source: Aip