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SolicitationsDOEDE-FOA-0003421
DOE
DOE SBIR 2026 Ph. I R1 · SBIR · Phase I

DE-FOA-0003421 · Long-Duration Energy Storage Systems

Grid-scale, long-duration storage chemistries and controllers that extend dispatchable clean energy beyond lithium-ion durations.

Closes Tech volume ≤ 19 pg Agency portal
Typical administrative requirements11 requirements · confirm against the solicitation
Page limitsDOE SBIR/STTR FOAMECHANICAL
Technical volume ≤ 19 pg
Cover sheet, cost volume and commercialization material are typically excluded from the count — confirm exclusions in the live solicitation.
19 pg
FontDOE SBIR/STTR FOAMECHANICAL
≥ 11 pt, no compression
Use a standard serif/sans face; condensed or narrow variants are commonly disallowed.
≥ 11 pt
MarginsDOE SBIR/STTR FOAMECHANICAL
≥ 1.0″ on all four sides
Margins are measured from the PDF page box and usually include headers and footers.
≥ 1.0″
Line spacingDOE SBIR/STTR FOAMECHANICAL
Single-spacing minimum
No more restrictive than single; tables and figures are typically exempt.
Single+
Required sectionsDOE SBIR/STTR FOASEMANTIC
All mandated technical sections present
Match the solicitation's required structure and headings exactly — a mismatched heading is a known reject trigger.
Required
EligibilityDOE SBIR/STTR FOASEMANTIC
US small business, < 500 employees
>50% US-owned and controlled by individuals; for SBIR the PI's primary employment must be with the firm at award.
SBC
Foreign ownershipDOE SBIR/STTR FOASEMANTIC
FOCI / foreign-affiliation disclosure
Disclose foreign ownership, control or influence and the foreign affiliations of key personnel where required.
Disclose
RegistrationsDOE SBIR/STTR FOASEMANTIC
SAM.gov + UEI active; SBC registry
Active SAM.gov registration and a valid Unique Entity ID at submission; SBA Company Registry for SBIR/STTR.
Active
Cost volumeDOE SBIR/STTR FOASEMANTIC
Separate cost volume within the topic ceiling
Submitted separately from the technical volume and within the program/topic funding ceiling.
Separate
AI-use disclosureDOE SBIR/STTR FOASEMANTIC
Disclose assistive AI use
Generative AI may typically assist with editing/formatting only; substantive content must be human-authored and any use disclosed where required.
If used
DeadlineDOE SBIR/STTR FOAMECHANICAL
Submit via the agency portal by Jul 6, 2026
The full electronic submission, including every volume, must be certified before the closing date/time.
Jul 6
AI-use disclosure · DOE
SolicitFit checks compliance — it never writes your proposal.

Confirm this agency's AI-use policy in the current solicitation. Generative AI may typically assist with editing and formatting only; substantive content must be human-authored and any use disclosed where required.

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