High-performance Optimized Recycled Nuclear Isotopes for Gen IV reactors (HORNIG): eligibility, deadline, and how to apply (2026)
Key Facts
- Agency
- Advanced Research Projects Agency Energy
- Award Range
- $500,000 to $7,000,000
- Deadline
- Closed 2026-08-06
- Time Remaining
- This cycle closed on 2026-08-06. Check grants.gov for the next cycle.
- CFDA Number
- 81.135
The High-performance Optimized Recycled Nuclear Isotopes for Gen IV reactors (HORNIG) program is a federal funding opportunity administered by the Advanced Research Projects Agency Energy. This guide covers everything you need to know to determine whether you qualify and how to submit a competitive application once the next cycle opens.
Use our free Grant Finder to discover additional programs you may be eligible for based on your organization type and location.
Eligibility requirements
To qualify for the High-performance Optimized Recycled Nuclear Isotopes for Gen IV reactors (HORNIG) program, applicants must meet the following criteria:
Details from the notice: See Section II.A. of the NOFO. Applicant types on grants.gov: Unrestricted: open to any type of organization, subject to any conditions in the notice.
Eligibility requirements can change between funding cycles. Always verify the current criteria on the official Grants.gov listing before beginning your application.
Not sure your organization qualifies? Run the free Grant Finder check → or compare other Research programs by who can apply.
How to apply: step by step
- Register on SAM.gov. Every federal grant applicant needs an active SAM (System for Award Management) registration. Allow 2-4 weeks for new registrations to process. Existing registrations must be renewed annually.
- Get a UEI number. Your Unique Entity Identifier is assigned through SAM.gov and replaces the old DUNS number. You will need this on every federal application.
- Review the Notice of Funding Opportunity (NOFO). Download the full NOFO from the Grants.gov listing. Pay close attention to review criteria, budget limits, and required attachments.
- Prepare your application package. Most federal grants require a project narrative, budget justification, organizational capacity statement, and supporting documents. Follow the page limits and formatting rules exactly.
- Submit through Grants.gov. Create a workspace, upload all required forms and attachments, and submit once the next cycle opens. The system timestamps your submission, and late applications are automatically rejected.
- Confirm receipt. Keep the tracking number or confirmation email, and check back in 1-2 business days that your application passed the validation checks.
For detailed guidance on writing a winning narrative, see our grant writing tips article.
Grant details
| Detail | Information |
|---|---|
| Grant Name | High-performance Optimized Recycled Nuclear Isotopes for Gen IV reactors (HORNIG) |
| Funding Agency | Advanced Research Projects Agency Energy |
| CFDA Number | 81.135 |
| Award Minimum | $500,000 |
| Award Maximum | $7,000,000 |
| Deadline | Closed 2026-08-06 |
| Category | Research |
| Matching Required | Yes, this program requires cost sharing or matching funds |
| Application Link | Apply on Grants.gov |
Federal grant budgets and priorities shift each fiscal year. The amounts listed above reflect the most recent funding cycle. For the latest figures, check the official program page.
If you are exploring business financing beyond grants, the team at CeoCult covers loans, lines of credit, and alternative funding for founders.
Check your fit for Research grants like this one before you apply: eligibility, match and registration in one worksheet.
Frequently asked questions
Who is eligible for the High-performance Optimized Recycled Nuclear Isotopes for Gen IV reactors (HORNIG) program?
Details from the notice: See Section II.A. of the NOFO. Applicant types on grants.gov: Unrestricted: open to any type of organization, subject to any conditions in the notice. Requirements can change between cycles, so always verify on the official Grants.gov listing before applying.
What is the deadline for High-performance Optimized Recycled Nuclear Isotopes for Gen IV reactors (HORNIG)?
The current deadline is closed on 2026-08-06; the next cycle has not been posted. Many federal grants operate on annual or rolling cycles. If this deadline has passed, check the Grants.gov listing for the next funding opportunity.
Does High-performance Optimized Recycled Nuclear Isotopes for Gen IV reactors (HORNIG) require matching funds?
Yes, this program requires cost sharing or matching funds. Matching requirements can vary by fiscal year and applicant type, so confirm with the funding agency before committing resources.