Dept of Energy ARPA-E  The Duration Addition to electricitY Storage (DAYS) program  
DE-FOA-0001906 

Grants.gov https://www.grants.gov/web/grants/view-opportunity.html?oppId=304526
ARPA-E  https://arpa-e-foa.energy.gov/#FoaIdc931d71c-1e66-4fea-8a27-91860bcd781d

Required Notice of Intent Deadline: 6/15/2018 5:00 pm ET

The Duration Addition to electricitY Storage (DAYS) program will pursue new long-duration electricity storage (LDES) technologies with discharge durations that range from 10 to approximately 100 hours at rated power. Such “long” durations are beyond the requirements for intra-day (“daily”) energy time shift and many other stationary electricity storage applications common on the grid today. ARPA-E believes durations at rated power of 10 to 100 hours are relevant for needs that go beyond daily cycling but are short of seasonal energy time-shift applications. Long-duration storage applications present new forms of technical challenges associated with exceptionally low lifetime cost requirements (including both capital and operating expenses), particularly for the energy storage media and related components. However, the lower number of cumulative cycles, acceptability of slow ramp rates, and other relaxed performance requirements that are associated with long durations and infrequent cycling provide opportunities for design tradeoffs that may be leveraged to reduce costs and realize economically-viable LDES systems.