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Program

ARPA-E HORNIG (Gen IV reactors)

Funds United States nuclear ventures for Gen IV reactor research and advanced reactor design.

ARPA-E HORNIG (Gen IV reactors) sits under the Advanced Research Projects Agency – Energy and focuses on advanced nuclear isotopes for next-generation reactors. It is an active U.S. grant route for for-profit applicants, with a rolling cycle and U.S.-only geography. Award sizes run from $500,000 to $5 million.

The program is shaped for energy technology teams rather than nonprofits or individuals

Max award$5M
Realistic median
Success rate
Decision time

No upcoming rounds verified. Cadence: Rolling.

Last verified: 14 May 2026Source: arpa-e-foa.energy.gov