Long-Duration Energy Storage (LDES) Portfolio

The Long-Duration Energy Storage portfolio sits under the U.S. Department of Energy's Office of Clean Energy Demonstrations and brings together the Long-Duration Energy Storage Demonstrations Program, the DOE/DOD Joint Program, and the Long-Duration Energy Storage Pilot Program. It is built around grid storage systems that can discharge for 10 hours or more, which makes it a direct fit for resilience and balancing use cases rather than short-duration battery deployment. The portfolio runs through cooperative agreements for U.S.-based for-profit companies, nonprofits, universities, and research organizations. It is limited to applicants that register and operate in the United States, excludes individuals, and has a multiple-per-year cycle pattern. The most recent open cycle was the Long-Duration Energy Storage Pilot Program, backed by a $100 million notice of funding opportunity issued in September 2024 and closed on March 14, 2025. The strongest applicants are teams that can show a credible demonstration site, a grid-relevant use case, and the ability to work across engineering, permitting, and operations. Because the portfolio now sits between cycles, the practical path is to watch for the next OCED solicitation and be ready with partners, a deployment location, and a clear technical case for multi-hour storage at scale.

No upcoming rounds verified. Cadence: Multiple per year.