NSF award 2451730 · Otoro Energy INC

SBIR Phase II: Flow Battery Electrolyte Purification: Unlocking 24-Hour Storage Potential

Final report due

29 December 2027

in 437 days · The award ends on 31 August 2027.

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Decide about an extension3 May 2027in 197 days
award ending 2027-08-31 · Research.gov
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Extension request17 Jul 2027in 272 days
award ending 2027-08-31 · Research.gov
PAPPG 24-1: “at least 45 days prior to the end date”
No-cost extension notice21 Aug 2027in 307 days
award ending 2027-08-31 · Research.gov
PAPPG 24-1: “at least ten calendar days prior to the end date”
Final report due29 Dec 2027in 437 days
award ending 2027-08-31 · Research.gov
PAPPG 24-1: “no later than 120-days following the end date of the award”
Project outcomes report due29 Dec 2027in 437 days
award ending 2027-08-31 · Research.gov
PAPPG 24-1: “no later than 120 days following the end date”
Award is closed out29 Dec 2027in 437 days
award ending 2027-08-31 · Research.gov
PAPPG 24-1: “financially closed out 120 days after their expiration date”

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NSF lists this award's end date as 31 August 2027.
NSF rules say the final report is due no later than 120 days after that.
So the final report is due by 29 December 2027.

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Award card

Award number: 2451730
Period of support: 1 Sep 2025 – 31 Aug 2027
Amount: $1,209,878
Awardee: Otoro Energy INC, Boulder, CO
Program: SBIR Phase II
Directorate: TIP

Abstract

The broader/commercial impact of this Small Business Innovation Research (SBIR) Phase II project is to enable cost-effective, long-duration energy storage, which is critical to ensuring a reliable electric grid. As demand for electricity is expected to soar in the coming years, grid operators require storage systems that can operate for 10 to 24+ hours to balance the supply and demand for power and ensure…

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