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Capital • May 9, 2026 • 4 min read

DOE fusion budget turns public-private milestones into the capital signal

DOE's FY 2026 Fusion Energy Sciences request lowers total FES funding because ITER construction falls, but it raises fusion and plasma research and nearly doubles public-private partnerships. The investable signal is where federal dollars de-risk private fusion: milestone validation, INFUSE lab access, materials, simulation, and burning-plasma science.

What to watch

  • DOE's FY 2026 request lists $744.78 million for Fusion Energy Sciences, down $45.22 million from FY 2025 enacted.
  • Fusion and Plasma Research rises to $564.76 million, up $98.67 million, while Public-Private Partnerships rise to $130 million, up $58.8 million.
  • U.S. Contributions to ITER fall to $77.5 million, down $122.5 million, shifting the visible budget signal toward domestic research and partnership channels.
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Deep Dive • Investment Strategy

Density limits are no longer one number. They are an engineering moat.

EAST shows density limits can be lifted with start-up control, while W7-X proves long pulses are possible with continuous fueling. Investors should track the enabling stack that makes both possible.

1.3-1.65x

Reported density range above the Greenwald limit (preprint).

0.8-1.0x

Typical EAST density range before the new method.

13 keV

Temperature scale for optimal D-T fusion (about 150M K).